Migrate from Claude Opus 4 to Claude Opus 4.8 with verified receipts
Claude Opus 4 vs Claude Opus 4.8: which should I use?
Upgrade Claude Opus 4 to Claude Opus 4.8 only after verifying parameter compatibility, output expansion from 4K to 64K, context scale to 500K, and running a duplicate-run canary budget. Verified 2026-09-07; unmeasured legacy benchmarks and unsupported parameters remain Unavailable.
Verified 2026-09-07
Where can you find price, speed, and task evidence for Claude Opus 4 and Claude Opus 4.8?
Which tasks fit Claude Opus 4 and Claude Opus 4.8?
Best-fit task signals from the published model strengths; this is not a substitute for a controlled benchmark.
| Fact | Claude Opus 4 | Claude Opus 4.8 |
|---|---|---|
| Best fit | Legacy Opus flagship workflows superseded by Opus 4.8. | Complex, multi-step tasks where Fable 5’s premium isn’t justified. |
| Reasoning mode | Unavailable | Available |
What does a Coding Agent workload cost with Claude Opus 4 and Claude Opus 4.8?
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 | Claude Opus 4.8 |
|---|---|---|
| Coding Agent / task | $0.45 (modeled) | $0.15 (modeled) (winner) |
| Input / output rate | $15.00 / $75.00 per M | $5.00 / $25.00 per M |
How fast are Claude Opus 4 and Claude Opus 4.8?
Only non-estimated benchmark results are shown as measured.
| Fact | Claude Opus 4 | Claude Opus 4.8 |
|---|---|---|
| Measured throughput | Unavailable | 58 tokens/s |
| Time to first token | Unavailable | 470 ms |
How compatible are Claude Opus 4 and Claude Opus 4.8 with APIs?
Provider-level wire-format and SDK facts; model-specific parameter differences may still apply.
| Fact | Claude Opus 4 | Claude Opus 4.8 |
|---|---|---|
| OpenAI SDK | Not drop-in | Not drop-in |
| Request shape | Messages API — system prompt is a top-level field, not a message role, and max_tokens is required on every call. | Messages API — system prompt is a top-level field, not a message role, and max_tokens is required on every call. |
| Streaming | SSE (Anthropic content-block events) | SSE (Anthropic content-block events) |
What are the privacy and retention policies for Claude Opus 4 and Claude Opus 4.8?
Provider policy and residency facts from the verified provider registry. A missing retention policy is not treated as a guarantee.
| Fact | Claude Opus 4 | Claude Opus 4.8 |
|---|---|---|
| Provider says API data trains models | No | No |
| Published retention period | Unavailable | Unavailable |
| Data residency | Unavailable | Unavailable |
How much effort does it take to migrate between Claude Opus 4 and Claude Opus 4.8?
Direction is from each displayed model to the other. Effort is derived from provider compatibility and published parameter maps.
| Fact | Claude Opus 4 | Claude Opus 4.8 |
|---|---|---|
| Move Claude Opus 4 → Claude Opus 4.8 | drop-in; 0 breaking parameter differences | Target: Claude Opus 4.8 |
| Move Claude Opus 4.8 → Claude Opus 4 | Source: Claude Opus 4.8 | drop-in; 0 breaking parameter differences |
| Why | Same provider; only the model identifier changes. | Same provider; only the model identifier changes. |
Claude Opus 4 vs Claude Opus 4.8 request-and-response migration diff
Formula: eligibility = input ≤ contextWindow AND output ≤ maxOutput; unsupported request fields are enumerated and must be retested before rollout.
| Field | Claude Opus 4 | Claude Opus 4.8 |
|---|---|---|
| Identifier | claude-opus-4 | claude-opus-4-8 |
| Context | 200,000 | 500,000 |
| Max output | 4,096 | 64,000 |
| Vision | Available | Available |
| Reasoning | Unavailable | Available |
| Unsupported parameters | temperature, top_p, top_k, logprobs, response_format, reasoning_effort: unsupported on this legacy run; adapter must strip or reject them | temperature, top_p, top_k, logprobs, response_format, reasoning_effort: unsupported until provider-verified; adapter must strip or reject them |
| Migration action | Preserve only documented fields; no silent coercion | Run parameter-compatibility replay before promotion |
Verified 2026-04-06. Pricing provenance: Claude Opus 4 pricing (2026-04-06); Claude Opus 4.8 pricing (2026-06-07). Capability: Claude Opus 4; Claude Opus 4.8. Provider: Anthropic; Anthropic. Missing evidence is Unavailable, never inferred.
Claude Opus 4 vs Claude Opus 4.8 duplicate-run canary budget
Formula: staged spend = traffic share × [bill(A) + bill(B)]; bill = (input × input $/M + output × output $/M) / 1,000,000. No success probability is assigned.
| Traffic | Computed duplicate spend | Gate |
|---|---|---|
| 1% | $0.204000 | User assumption: acceptance floor + rollback threshold |
| 5% | $1.020000 | User assumption: acceptance floor + rollback threshold |
| 10% | $2.040000 | User assumption: acceptance floor + rollback threshold |
| 25% | $5.100000 | User assumption: acceptance floor + rollback threshold |
Shape: 1,000,000 input + 4,000 output per duplicate. Formula is rendered so the user can replace the workload; acceptance and rollback are explicit user inputs.
Verified 2026-04-06. Pricing provenance: Claude Opus 4 pricing (2026-04-06); Claude Opus 4.8 pricing (2026-06-07). Capability: Claude Opus 4; Claude Opus 4.8. Provider: Anthropic; Anthropic. Missing evidence is Unavailable, never inferred.
Claude Opus 4 vs Claude Opus 4.8 128K/200K/500K workload gate
Formula: completion seconds = output tokens ÷ measured tokens/s; quality is joined only from an exact matched test result, otherwise Unavailable.
| Workload | Claude Opus 4 | Claude Opus 4.8 |
|---|---|---|
| 128,000 input + 4,000 output | Eligible; context 200,000; max output 4,096; cost $2.220000; time Unavailable; evidence No legacy run | Eligible; context 500,000; max output 64,000; cost $0.740000; time 68.97s; evidence Unavailable; premium 100/100; 246 in / 985 out; 10119 ms; $0.025855; run 2026-06-21T00:00:00.000Z |
| 200,000 input + 4,000 output | Eligible; context 200,000; max output 4,096; cost $3.300000; time Unavailable; evidence No legacy run | Eligible; context 500,000; max output 64,000; cost $1.100000; time 68.97s; evidence Unavailable; premium 100/100; 246 in / 985 out; 10119 ms; $0.025855; run 2026-06-21T00:00:00.000Z |
| 500,000 input + 4,000 output | Excluded; context 200,000; max output 4,096; cost Unavailable; time Unavailable; evidence No legacy run | Eligible; context 500,000; max output 64,000; cost $2.600000; time 68.97s; evidence Unavailable; premium 100/100; 246 in / 985 out; 10119 ms; $0.025855; run 2026-06-21T00:00:00.000Z |
Verified 2026-04-06. Pricing provenance: Claude Opus 4 pricing (2026-04-06); Claude Opus 4.8 pricing (2026-06-07). Capability: Claude Opus 4; Claude Opus 4.8. Provider: Anthropic; Anthropic. Missing evidence is Unavailable, never inferred.
Batch 60 · exact-pair decision contributions · verified 2026-09-07
Exact pair boundary: Anthropic; exact model string, parameter support, token limits, and regression test hashes must join. Requested models are claude-opus-4 and claude-opus-4-8. Provider, rate, pricing, and task pages remain fact owners.
Opus 4 to 4.8 request-and-response migration diff
Frozen Batch 60 scenario board. Formula / deterministic rule: admit = model_id match + context <= 500K + output <= 64K + parameter compatibility; unsupported parameters => Unavailable Boundary: Owns exact parameter and interface migration diff; Anthropic profile owns provider-wide policies.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch60-claude-opus-4-vs-claude-opus-4-8-m1-r1context window (200K vs 500K) | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=context window (200K vs 500K); parameter mapping; context limits; max output; vision support; tool calling; validation status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — context window (200K vs 500K) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-vs-claude-opus-4-8-m1-r2max output tokens (4K vs 64K) | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=max output tokens (4K vs 64K); parameter mapping; context limits; max output; vision support; tool calling; validation status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — max output tokens (4K vs 64K) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-vs-claude-opus-4-8-m1-r3reasoning effort controls | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=reasoning effort controls; parameter mapping; context limits; max output; vision support; tool calling; validation status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — reasoning effort controls is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-vs-claude-opus-4-8-m1-r4vision input payloads | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=vision input payloads; parameter mapping; context limits; max output; vision support; tool calling; validation status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — vision input payloads is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-vs-claude-opus-4-8-m1-r5system prompt behavior | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=system prompt behavior; parameter mapping; context limits; max output; vision support; tool calling; validation status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — system prompt behavior is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-vs-claude-opus-4-8-m1-r6unsupported legacy parameter | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=unsupported legacy parameter; parameter mapping; context limits; max output; vision support; tool calling; validation status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — unsupported legacy parameter has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
First-party provenance: Anthropic Messages API; verification date 2026-09-07. Missing or conflicting joins fail closed.
Duplicate-run canary traffic budget
Frozen Batch 60 scenario board. Formula / deterministic rule: canary_spend = traffic_share * (tokens_in * rate_in + tokens_out * rate_out) * duplicate_factor; user tolerance limits control rollback Boundary: Owns pair-specific canary budget modeling during model transition.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch60-claude-opus-4-vs-claude-opus-4-8-m2-r11% canary phase | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=1% canary phase; traffic percentage; input tokens; output tokens; dual billing spend; acceptance threshold; rollback status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 1% canary phase is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-vs-claude-opus-4-8-m2-r25% canary ramp | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=5% canary ramp; traffic percentage; input tokens; output tokens; dual billing spend; acceptance threshold; rollback status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 5% canary ramp is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-vs-claude-opus-4-8-m2-r310% validation phase | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=10% validation phase; traffic percentage; input tokens; output tokens; dual billing spend; acceptance threshold; rollback status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 10% validation phase is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-vs-claude-opus-4-8-m2-r425% pre-cutover verification | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=25% pre-cutover verification; traffic percentage; input tokens; output tokens; dual billing spend; acceptance threshold; rollback status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 25% pre-cutover verification is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-vs-claude-opus-4-8-m2-r5100% full cutover | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=100% full cutover; traffic percentage; input tokens; output tokens; dual billing spend; acceptance threshold; rollback status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 100% full cutover is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-vs-claude-opus-4-8-m2-r6rollback triggered | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=rollback triggered; traffic percentage; input tokens; output tokens; dual billing spend; acceptance threshold; rollback status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — rollback triggered is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
First-party provenance: Anthropic API pricing; verification date 2026-09-07. Missing or conflicting joins fail closed.
Workload context eligibility and completion gate
Frozen Batch 60 scenario board. Formula / deterministic rule: eligible = prompt_tokens <= model_context && output_tokens <= model_max_output; missing legacy timing => Untested Boundary: Owns workload fit across 128K, 200K, and 500K document shapes.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch60-claude-opus-4-vs-claude-opus-4-8-m3-r1standard 32K document QA | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=standard 32K document QA; workload shape; token size; context fit; measured latency; completion status; quality uplift rule; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — standard 32K document QA is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-vs-claude-opus-4-8-m3-r2dense 128K codebase review | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=dense 128K codebase review; workload shape; token size; context fit; measured latency; completion status; quality uplift rule; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — dense 128K codebase review is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-vs-claude-opus-4-8-m3-r3200K legacy limit boundary | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=200K legacy limit boundary; workload shape; token size; context fit; measured latency; completion status; quality uplift rule; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 200K legacy limit boundary is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-vs-claude-opus-4-8-m3-r4350K expanded repo analysis | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=350K expanded repo analysis; workload shape; token size; context fit; measured latency; completion status; quality uplift rule; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 350K expanded repo analysis is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-vs-claude-opus-4-8-m3-r5500K maximum context stress | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=500K maximum context stress; workload shape; token size; context fit; measured latency; completion status; quality uplift rule; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 500K maximum context stress is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-vs-claude-opus-4-8-m3-r6unsupported context overflow | pair=claude-opus-4 vs claude-opus-4-8; provider=Anthropic; hostA=api.anthropic.com; hostB=api.anthropic.com; surfaceA=Messages API (legacy); surfaceB=Messages API; requested/effective IDs=claude-opus-4,claude-opus-4-8; scenario=unsupported context overflow; workload shape; token size; context fit; measured latency; completion status; quality uplift rule; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — unsupported context overflow has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
First-party provenance: Anthropic Claude model 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-vs-claude-opus-4-8 Batch 60 scenario →
How do Claude Opus 4 and Claude Opus 4.8 compare on specs?
| Claude Opus 4 | Claude Opus 4.8 | |
|---|---|---|
| Price (input) | $15.00/M | $5.00/M ✓ |
| Price (output) | $75.00/M | $25.00/M ✓ |
| Blended price | $30.00/M | $10.00/M ✓ |
| Context window | 200,000 tokens | 500,000 tokens ✓ |
| Max output | 4,096 tokens | 64,000 tokens ✓ |
| Modalities | text, vision | text, vision |
| Reasoning mode | No | Yes |
| Released | 2024-03 | 2026-04 |
| Speed | Not measured | 58 t/s |
How much do Claude Opus 4 and Claude Opus 4.8 cost at scale?
| Tokens / month | Claude Opus 4 | Claude Opus 4.8 | Delta |
|---|---|---|---|
| 1,000,000 | $30.00 | $10.00 | $20.00 (3.0×) |
| 10,000,000 | $300.00 | $100.00 | $200.00 (3.0×) |
| 100,000,000 | $3000.00 | $1000.00 | $2000.00 (3.0×) |
Choose Claude Opus 4 if…
- ✓Former Anthropic flagship
- ✓Deeply nuanced prose and analysis
- ✓Reliable instruction following
- ✓Legacy Opus flagship workflows superseded by Opus 4.8.
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.
Run this exact matchup right now
Send the same prompt to Claude Opus 4 and Claude Opus 4.8 side by side and see the outputs yourself.
Try Claude Opus 4 vs Claude Opus 4.8 FreeWhat are common questions about Claude Opus 4 and Claude Opus 4.8?
Is Claude Opus 4 cheaper than Claude Opus 4.8?
Claude Opus 4.8 is cheaper, at $10.00 per million blended tokens vs $30.00 for Claude Opus 4.
Which has the bigger context window, Claude Opus 4 or Claude Opus 4.8?
Claude Opus 4.8 has the larger context window: 500,000 tokens vs 200,000.
Can Claude Opus 4 replace Claude Opus 4.8 for coding?
Both are viable for coding. Former Anthropic flagship (Claude Opus 4) vs Elite coding and multi-step reasoning (Claude Opus 4.8) — pick based on which strength matters more for your workload.
Neither of these? See Claude Opus 4.8 alternatives.
What related comparisons help choose between Claude Opus 4 and Claude Opus 4.8?
Claude Opus 4 pricingClaude Opus 4.8 pricingvs DeepSeek V4 Provs Gemini 3.1 Provs Gemini 3.7 Flashvs GPT-5.6 SolPremium model tests
Pricing verified 2026-04-06. Specs verified 2026-08-14.