Compare Claude Opus 4.8 and Grok 4.5: Analytical Rigor vs 2M Context Coding Loops
Claude Opus 4.8 vs Grok 4.5: which should I use?
Claude Opus 4.8 offers premier analytical logic, extended thinking depth, and 90% cache read discounts, while Grok 4.5 provides a massive 2M context window and specialized coding agent tool loops. Verified 2026-09-07.
Verified 2026-09-07
Where can you find price, speed, and task evidence for Claude Opus 4.8 and Grok 4.5?
Which tasks fit Claude Opus 4.8 and Grok 4.5?
Best-fit task signals from the published model strengths; this is not a substitute for a controlled benchmark.
| Fact | Claude Opus 4.8 | Grok 4.5 |
|---|---|---|
| Best fit | Complex, multi-step tasks where Fable 5’s premium isn’t justified. | Agentic software engineering and workflow automation that need strong coding capability at a competitive price. |
| Reasoning mode | Available | Available |
What does a Coding Agent workload cost with Claude Opus 4.8 and Grok 4.5?
Modeled for Coding Agent: 20,000 input + 2,000 output tokens per task, 1 turn. This is a workload model, not a provider quote.
| Fact | Claude Opus 4.8 | Grok 4.5 |
|---|---|---|
| Coding Agent / task | $0.15 (modeled) | $0.05 (modeled) (winner) |
| Input / output rate | $5.00 / $25.00 per M | $2.00 / $6.00 per M |
How fast are Claude Opus 4.8 and Grok 4.5?
Only non-estimated benchmark results are shown as measured.
| Fact | Claude Opus 4.8 | Grok 4.5 |
|---|---|---|
| Measured throughput | 58 tokens/s | Unavailable |
| Time to first token | 470 ms | Unavailable |
How compatible are Claude Opus 4.8 and Grok 4.5 with APIs?
Provider-level wire-format and SDK facts; model-specific parameter differences may still apply.
| Fact | Claude Opus 4.8 | Grok 4.5 |
|---|---|---|
| OpenAI SDK | Not drop-in | Usable |
| Request shape | Messages API — system prompt is a top-level field, not a message role, and max_tokens is required on every call. | Full OpenAI chat/completions compatibility — point the openai SDK at api.x.ai and it works unmodified. |
| Streaming | SSE (Anthropic content-block events) | SSE (OpenAI delta) |
What are the privacy and retention policies for Claude Opus 4.8 and Grok 4.5?
Provider policy and residency facts from the verified provider registry. A missing retention policy is not treated as a guarantee.
| Fact | Claude Opus 4.8 | Grok 4.5 |
|---|---|---|
| Provider says API data trains models | No | Unavailable |
| Published retention period | Unavailable | Unavailable |
| Data residency | Unavailable | Unavailable |
How much effort does it take to migrate between Claude Opus 4.8 and Grok 4.5?
Direction is from each displayed model to the other. Effort is derived from provider compatibility and published parameter maps.
| Fact | Claude Opus 4.8 | Grok 4.5 |
|---|---|---|
| Move Claude Opus 4.8 → Grok 4.5 | config; 3 breaking parameter differences | Target: Grok 4.5 |
| Move Grok 4.5 → Claude Opus 4.8 | Source: Grok 4.5 | code-change; 8 breaking parameter differences |
| Why | Keep the `openai` SDK; change `baseURL` and the API key. | Messages API — system prompt is a top-level field, not a message role, and max_tokens is required on every call. |
Batch 56 · exact-pair decision contributions. Surface verification: 2026-09-02. Exactly three boards are server-rendered from frozen scenario fixtures; assumptions and unavailable joins are not observations.
Exact pair boundary: Anthropic / xAI; exact model ID, host, worktree, controls, tools, and artifact lineage must join. Requested models are claude-opus-4-8 and grok-4.5. Provider, rate, pricing, and task pages remain fact owners.
Opus/Grok repository-state equivalence register
Frozen Batch 56 scenario board. Formula / deterministic rule: admit = commit + tree + submodule hashes + tool/filesystem envelope match; any start-state difference => blocked Boundary: Owns exact-pair repository-state equivalence; release-era coding and generic agent rankings remain adjacent owners.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch56-claude-opus-4-8-vs-grok-4-5-m1-r1clean worktree | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=clean worktree; repository/commit/tree hashes; exact IDs/hosts/settings; tool and filesystem envelope; ignored-file policy; equivalent/conditional/blocked state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — clean worktree is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-claude-opus-4-8-vs-grok-4-5-m1-r2generated files | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=generated files; repository/commit/tree hashes; exact IDs/hosts/settings; tool and filesystem envelope; ignored-file policy; equivalent/conditional/blocked state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — generated files is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-claude-opus-4-8-vs-grok-4-5-m1-r3submodules | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=submodules; repository/commit/tree hashes; exact IDs/hosts/settings; tool and filesystem envelope; ignored-file policy; equivalent/conditional/blocked state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — submodules is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-claude-opus-4-8-vs-grok-4-5-m1-r4large monorepo | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=large monorepo; repository/commit/tree hashes; exact IDs/hosts/settings; tool and filesystem envelope; ignored-file policy; equivalent/conditional/blocked state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — large monorepo is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-claude-opus-4-8-vs-grok-4-5-m1-r5dependency-lock drift | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=dependency-lock drift; repository/commit/tree hashes; exact IDs/hosts/settings; tool and filesystem envelope; ignored-file policy; equivalent/conditional/blocked state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — dependency-lock drift has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
batch56-claude-opus-4-8-vs-grok-4-5-m1-r6missing base commit | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=missing base commit; repository/commit/tree hashes; exact IDs/hosts/settings; tool and filesystem envelope; ignored-file policy; equivalent/conditional/blocked state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — missing base commit has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
First-party provenance: Anthropic Messages API; verification date 2026-09-02. Missing or conflicting joins fail closed.
Merge-ready patch evidence receipt
Frozen Batch 56 scenario board. Formula / deterministic rule: merge_ready = accepted patch + build/test/lint/security validators / matched attempts; prose-only or missing raw diff => Untested Boundary: Owns validator-backed merge readiness for this exact pair, not coding quality from a generated patch alone.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch56-claude-opus-4-8-vs-grok-4-5-m2-r1bug fix | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=bug fix; task/harness/input/diff hashes; exact controls; validator versions and denominator; accepted/rejected/Untested result; reviewer disposition; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — bug fix is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-claude-opus-4-8-vs-grok-4-5-m2-r2cross-file refactor | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=cross-file refactor; task/harness/input/diff hashes; exact controls; validator versions and denominator; accepted/rejected/Untested result; reviewer disposition; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — cross-file refactor is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-claude-opus-4-8-vs-grok-4-5-m2-r3dependency upgrade | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=dependency upgrade; task/harness/input/diff hashes; exact controls; validator versions and denominator; accepted/rejected/Untested result; reviewer disposition; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — dependency upgrade is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-claude-opus-4-8-vs-grok-4-5-m2-r4failing-test repair | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=failing-test repair; task/harness/input/diff hashes; exact controls; validator versions and denominator; accepted/rejected/Untested result; reviewer disposition; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — failing-test repair is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-claude-opus-4-8-vs-grok-4-5-m2-r5security patch | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=security patch; task/harness/input/diff hashes; exact controls; validator versions and denominator; accepted/rejected/Untested result; reviewer disposition; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — security patch is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-claude-opus-4-8-vs-grok-4-5-m2-r6no final diff | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=no final diff; task/harness/input/diff hashes; exact controls; validator versions and denominator; accepted/rejected/Untested result; reviewer disposition; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — no final diff is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
First-party provenance: xAI model documentation; verification date 2026-09-02. Missing or conflicting joins fail closed.
Long-horizon coding checkpoint and handoff board
Frozen Batch 56 scenario board. Formula / deterministic rule: continue = checkpoint + reversible state + side-effect audit + attempt budget; unsafe partial state => transfer or rollback Boundary: Owns long-horizon checkpoint and handoff evidence for Opus versus Grok 4.5 only.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch56-claude-opus-4-8-vs-grok-4-5-m3-r1clean completion | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=clean completion; event/checkpoint hashes; observed steps/tokens; reversible state; handoff artifact; attempt cap; continue/transfer/rollback outcome; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — clean completion is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-claude-opus-4-8-vs-grok-4-5-m3-r2repeated edit loop | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=repeated edit loop; event/checkpoint hashes; observed steps/tokens; reversible state; handoff artifact; attempt cap; continue/transfer/rollback outcome; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — repeated edit loop is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-claude-opus-4-8-vs-grok-4-5-m3-r3context compaction | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=context compaction; event/checkpoint hashes; observed steps/tokens; reversible state; handoff artifact; attempt cap; continue/transfer/rollback outcome; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — context compaction is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-claude-opus-4-8-vs-grok-4-5-m3-r4tool failure | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=tool failure; event/checkpoint hashes; observed steps/tokens; reversible state; handoff artifact; attempt cap; continue/transfer/rollback outcome; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — tool failure has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
batch56-claude-opus-4-8-vs-grok-4-5-m3-r5partial side effect | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=partial side effect; event/checkpoint hashes; observed steps/tokens; reversible state; handoff artifact; attempt cap; continue/transfer/rollback outcome; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — partial side effect is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-claude-opus-4-8-vs-grok-4-5-m3-r6reviewer takeover | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com or declared managed host; hostB=api.x.ai or declared gateway; surfaceA=Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=reviewer takeover; event/checkpoint hashes; observed steps/tokens; reversible state; handoff artifact; attempt cap; continue/transfer/rollback outcome; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — reviewer takeover is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
First-party provenance: Anthropic Messages API; verification date 2026-09-02. Missing or conflicting joins fail closed.
Method and limitations: formulas are deterministic; observed and assumed inputs are labeled; no missing provider, host, account, region, realm, alias, snapshot, revision, weight, artifact, control, tool, modality, workload, rate-period, timestamp, or result is transferred. Run the claude-opus-4-8-vs-grok-4-5 Batch 56 scenario →
Batch 64 · exact-pair decision contributions · verified 2026-09-07
Exact pair boundary: Anthropic / xAI; model endpoint, 500K vs 2M context scale, extended thinking vs coding agent tool loops, and token tariffs must join. Requested models are claude-opus-4-8 and grok-4.5. Provider, rate, pricing, and task pages remain fact owners.
Token pricing and enterprise workload monthly spend matrix
Frozen Batch 64 scenario board. Formula / deterministic rule: monthly_spend = calls * ((in_tokens * rate_in + out_tokens * rate_out) / 1M) Boundary: Owns base token tariff comparisons and workload budgeting.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch64-claude-opus-4-8-vs-grok-4-5-m1-r110K interactive reasoning queries | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=10K interactive reasoning queries; workload; prompt tokens; completion tokens; Opus 4.8 spend; Grok 4.5 spend; budget delta; price champion; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 10K interactive reasoning queries is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch64-claude-opus-4-8-vs-grok-4-5-m1-r250K automated code reviews | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=50K automated code reviews; workload; prompt tokens; completion tokens; Opus 4.8 spend; Grok 4.5 spend; budget delta; price champion; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 50K automated code reviews is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch64-claude-opus-4-8-vs-grok-4-5-m1-r3100K document analysis calls | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=100K document analysis calls; workload; prompt tokens; completion tokens; Opus 4.8 spend; Grok 4.5 spend; budget delta; price champion; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 100K document analysis calls is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch64-claude-opus-4-8-vs-grok-4-5-m1-r4prompt caching active (Opus 90% read discount) | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=prompt caching active (Opus 90% read discount); workload; prompt tokens; completion tokens; Opus 4.8 spend; Grok 4.5 spend; budget delta; price champion; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — prompt caching active (Opus 90% read discount) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch64-claude-opus-4-8-vs-grok-4-5-m1-r5batch processing active (Opus 50% discount) | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=batch processing active (Opus 50% discount); workload; prompt tokens; completion tokens; Opus 4.8 spend; Grok 4.5 spend; budget delta; price champion; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — batch processing active (Opus 50% discount) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch64-claude-opus-4-8-vs-grok-4-5-m1-r6unresolved pricing currency | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=unresolved pricing currency; workload; prompt tokens; completion tokens; Opus 4.8 spend; Grok 4.5 spend; budget delta; price champion; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — unresolved pricing currency has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
First-party provenance: Anthropic API pricing; verification date 2026-09-07. Missing or conflicting joins fail closed.
Context window saturation (500K vs 2M) capability gate
Frozen Batch 64 scenario board. Formula / deterministic rule: eligible = (context <= 500K ? Both : (context <= 2M ? Grok : Excluded)) Boundary: Owns context scaling and capability gating for large repositories.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch64-claude-opus-4-8-vs-grok-4-5-m2-r1small library codebase (50K tokens) | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=small library codebase (50K tokens); context size; Opus 4.8 eligible; Grok 4.5 eligible; Opus cost; Grok cost; context gating verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — small library codebase (50K tokens) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch64-claude-opus-4-8-vs-grok-4-5-m2-r2medium application service (250K tokens) | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=medium application service (250K tokens); context size; Opus 4.8 eligible; Grok 4.5 eligible; Opus cost; Grok cost; context gating verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — medium application service (250K tokens) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch64-claude-opus-4-8-vs-grok-4-5-m2-r3large monolithic codebase (500K boundary) | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=large monolithic codebase (500K boundary); context size; Opus 4.8 eligible; Grok 4.5 eligible; Opus cost; Grok cost; context gating verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — large monolithic codebase (500K boundary) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch64-claude-opus-4-8-vs-grok-4-5-m2-r4massive enterprise monorepo (1M tokens) | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=massive enterprise monorepo (1M tokens); context size; Opus 4.8 eligible; Grok 4.5 eligible; Opus cost; Grok cost; context gating verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — massive enterprise monorepo (1M tokens) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch64-claude-opus-4-8-vs-grok-4-5-m2-r52M full context saturation test | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=2M full context saturation test; context size; Opus 4.8 eligible; Grok 4.5 eligible; Opus cost; Grok cost; context gating verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 2M full context saturation test is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch64-claude-opus-4-8-vs-grok-4-5-m2-r6unsupported archive payload format | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=unsupported archive payload format; context size; Opus 4.8 eligible; Grok 4.5 eligible; Opus cost; Grok cost; context gating verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — unsupported archive payload format has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
First-party provenance: xAI Grok documentation; verification date 2026-09-07. Missing or conflicting joins fail closed.
Coding agent iterative tool loop token burn ledger
Frozen Batch 64 scenario board. Formula / deterministic rule: session_cost = sum_loops((cumulative_prompt * rate_in + tool_call_out * rate_out) / 1M) Boundary: Owns multi-step coding agent loop cost modeling.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch64-claude-opus-4-8-vs-grok-4-5-m3-r13-step function execution loop | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=3-step function execution loop; agent loop depth; cumulative input tokens; emitted tool tokens; Opus 4.8 spend; Grok 4.5 spend; cost ratio; agent status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 3-step function execution loop is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch64-claude-opus-4-8-vs-grok-4-5-m3-r210-step autonomous bug hunting | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=10-step autonomous bug hunting; agent loop depth; cumulative input tokens; emitted tool tokens; Opus 4.8 spend; Grok 4.5 spend; cost ratio; agent status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 10-step autonomous bug hunting is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch64-claude-opus-4-8-vs-grok-4-5-m3-r325-step full PR generation loop | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=25-step full PR generation loop; agent loop depth; cumulative input tokens; emitted tool tokens; Opus 4.8 spend; Grok 4.5 spend; cost ratio; agent status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 25-step full PR generation loop is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch64-claude-opus-4-8-vs-grok-4-5-m3-r450-step multi-file architectural refactor | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=50-step multi-file architectural refactor; agent loop depth; cumulative input tokens; emitted tool tokens; Opus 4.8 spend; Grok 4.5 spend; cost ratio; agent status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 50-step multi-file architectural refactor is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch64-claude-opus-4-8-vs-grok-4-5-m3-r5infinite loop circuit breaker trigger | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=infinite loop circuit breaker trigger; agent loop depth; cumulative input tokens; emitted tool tokens; Opus 4.8 spend; Grok 4.5 spend; cost ratio; agent status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — infinite loop circuit breaker trigger is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch64-claude-opus-4-8-vs-grok-4-5-m3-r6unhandled tool call syntax error | pair=claude-opus-4-8 vs grok-4.5; provider=Anthropic / xAI; hostA=api.anthropic.com; hostB=api.x.ai; surfaceA=Anthropic Messages API; surfaceB=xAI API; requested/effective IDs=claude-opus-4-8,grok-4.5; scenario=unhandled tool call syntax error; agent loop depth; cumulative input tokens; emitted tool tokens; Opus 4.8 spend; Grok 4.5 spend; cost ratio; agent status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — unhandled tool call syntax error is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
First-party provenance: xAI API pricing documentation; verification date 2026-09-07. Missing or conflicting joins fail closed.
Method and limitations: formulas are deterministic; observed and assumed inputs are labeled; no missing provider, host, account, region, realm, alias, snapshot, revision, weight, artifact, control, tool, modality, workload, rate-period, timestamp, or result is transferred. Run the claude-opus-4-8-vs-grok-4-5 Batch 64 scenario →
How do Claude Opus 4.8 and Grok 4.5 compare on specs?
| Claude Opus 4.8 | Grok 4.5 | |
|---|---|---|
| Price (input) | $5.00/M | $2.00/M ✓ |
| Price (output) | $25.00/M | $6.00/M ✓ |
| Blended price | $10.00/M | $3.00/M ✓ |
| Context window | 500,000 tokens | 500,000 tokens |
| Max output | 64,000 tokens | 64,000 tokens |
| Modalities | text, vision | text, vision |
| Reasoning mode | Yes | Yes |
| Released | 2026-04 | 2026-07 |
| Speed | 58 t/s | Not measured |
How much do Claude Opus 4.8 and Grok 4.5 cost at scale?
| Tokens / month | Claude Opus 4.8 | Grok 4.5 | Delta |
|---|---|---|---|
| 1,000,000 | $10.00 | $3.00 | $7.00 (3.3×) |
| 10,000,000 | $100.00 | $30.00 | $70.00 (3.3×) |
| 100,000,000 | $1000.00 | $300.00 | $700.00 (3.3×) |
Choose Claude Opus 4.8 if…
- ✓Elite coding and multi-step reasoning
- ✓Strong instruction following on ambiguous prompts
- ✓Extended-thinking mode
- ✓Complex, multi-step tasks where Fable 5’s premium isn’t justified.
Choose Grok 4.5 if…
- ✓xAI coding model for agents and engineering
- ✓Configurable reasoning for complex tasks
- ✓500K-token context at $2/$6 per million tokens
- ✓Agentic software engineering and workflow automation that need strong coding capability at a competitive price.
Run this exact matchup right now
Send the same prompt to Claude Opus 4.8 and Grok 4.5 side by side and see the outputs yourself.
Try Claude Opus 4.8 vs Grok 4.5 FreeWhat are common questions about Claude Opus 4.8 and Grok 4.5?
Is Claude Opus 4.8 cheaper than Grok 4.5?
Grok 4.5 is cheaper, at $3.00 per million blended tokens vs $10.00 for Claude Opus 4.8.
Which has the bigger context window, Claude Opus 4.8 or Grok 4.5?
Both models support 500,000 tokens of context.
Can Claude Opus 4.8 replace Grok 4.5 for coding?
Both are viable for coding. Elite coding and multi-step reasoning (Claude Opus 4.8) vs xAI coding model for agents and engineering (Grok 4.5) — pick based on which strength matters more for your workload.
Neither of these? See Claude Opus 4.8 alternatives or Grok 4.5 alternatives.
What related comparisons help choose between Claude Opus 4.8 and Grok 4.5?
Claude Opus 4.8 pricingGrok 4.5 pricingvs Claude Opus 4vs DeepSeek V4 Provs Gemini 3.1 Provs Gemini 3.7 FlashPremium model tests
Pricing verified 2026-06-07. Specs verified 2026-08-14.