Compare Claude Opus 4.8 and Gemini 3.1 Pro on verified benchmarks
Claude Opus 4.8 vs Gemini 3.1 Pro: which should I use?
Compare Claude Opus 4.8 and Gemini 3.1 Pro using matched benchmark observations (constraint logic and median arrays), context requirements (500K vs 2M), and audio/video input eligibility. Verified 2026-09-07; missing modalities and unmeasured speed samples fail closed.
Verified 2026-09-07
Where can you find price, speed, and task evidence for Claude Opus 4.8 and Gemini 3.1 Pro?
Which tasks fit Claude Opus 4.8 and Gemini 3.1 Pro?
Best-fit task signals from the published model strengths; this is not a substitute for a controlled benchmark.
| Fact | Claude Opus 4.8 | Gemini 3.1 Pro |
|---|---|---|
| Best fit | Complex, multi-step tasks where Fable 5’s premium isn’t justified. | Whole-codebase, whole-document, or long-video analysis in a single request. |
| Reasoning mode | Available | Available |
What does a Coding Agent workload cost with Claude Opus 4.8 and Gemini 3.1 Pro?
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 | Gemini 3.1 Pro |
|---|---|---|
| Coding Agent / task | $0.15 (modeled) | $0.06 (modeled) (winner) |
| Input / output rate | $5.00 / $25.00 per M | $2.00 / $12.00 per M |
How fast are Claude Opus 4.8 and Gemini 3.1 Pro?
Only non-estimated benchmark results are shown as measured.
| Fact | Claude Opus 4.8 | Gemini 3.1 Pro |
|---|---|---|
| Measured throughput | 58 tokens/s (winner) | 55 tokens/s |
| Time to first token | 470 ms | 420 ms |
How compatible are Claude Opus 4.8 and Gemini 3.1 Pro with APIs?
Provider-level wire-format and SDK facts; model-specific parameter differences may still apply.
| Fact | Claude Opus 4.8 | Gemini 3.1 Pro |
|---|---|---|
| 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. | contents/parts structure instead of messages; an OpenAI-compatible endpoint exists but only covers a subset of parameters. |
| Streaming | SSE (Anthropic content-block events) | SSE (Gemini streamGenerateContent) |
What are the privacy and retention policies for Claude Opus 4.8 and Gemini 3.1 Pro?
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 | Gemini 3.1 Pro |
|---|---|---|
| Provider says API data trains models | No | No |
| Published retention period | Unavailable | Unavailable |
| Data residency | Unavailable | Global by default; Vertex AI offers selectable regional endpoints |
How much effort does it take to migrate between Claude Opus 4.8 and Gemini 3.1 Pro?
Direction is from each displayed model to the other. Effort is derived from provider compatibility and published parameter maps.
| Fact | Claude Opus 4.8 | Gemini 3.1 Pro |
|---|---|---|
| Move Claude Opus 4.8 → Gemini 3.1 Pro | code-change; 1 breaking parameter difference | Target: Gemini 3.1 Pro |
| Move Gemini 3.1 Pro → Claude Opus 4.8 | Source: Gemini 3.1 Pro | code-change; 7 breaking parameter differences |
| Why | contents/parts structure instead of messages; an OpenAI-compatible endpoint exists but only covers a subset of parameters. | Messages API — system prompt is a top-level field, not a message role, and max_tokens is required on every call. |
Claude Opus 4.8 vs Gemini 3.1 Pro matched constraint-test cost per passing run
Formula: cost per passing run = exact recorded costUsd when status=completed and accuracy ≥ 70/100; otherwise Unavailable.
| Matched evidence | Claude Opus 4.8 | Gemini 3.1 Pro |
|---|---|---|
| Constraint puzzle | 100/100; 246 in / 985 out; 10119 ms; $0.025855; run 2026-06-21T00:00:00.000Z | 98/100; 180 in / 518 out; 22828 ms; $0.006576; run 2026-06-21T00:00:00.000Z |
| Median-array test | 100/100; 220 in / 382 out; 3790 ms; $0.010650; run 2026-06-21T00:00:00.000Z | 99/100; 164 in / 320 out; 17413 ms; $0.004168; run 2026-06-21T00:00:00.000Z |
| Cost per passing run: constraint | $0.025855 | $0.006576 |
| Cost per passing run: median | $0.010650 | $0.004168 |
Verified 2026-04-06. Pricing provenance: Claude Opus 4.8 pricing (2026-06-07); Gemini 3.1 Pro pricing (2026-04-06). Capability: Claude Opus 4.8; Gemini 3.1 Pro. Provider: Anthropic; Google. Missing evidence is Unavailable, never inferred.
Claude Opus 4.8 vs Gemini 3.1 Pro long-context fit-and-bill matrix
Formula: cost is calculated only after context/output gates; modalities are provider/model facts, not quality claims.
| Shape | Claude Opus 4.8 | Gemini 3.1 Pro |
|---|---|---|
| 200,000 text | Eligible; context 500,000; max output 64,000; cost $1.200000 | Eligible; context 2,000,000; max output 64,000; cost $0.496000 |
| 500,000 text | Eligible; context 500,000; max output 64,000; cost $2.700000 | Eligible; context 2,000,000; max output 64,000; cost $1.096000 |
| 1,000,000 text | Excluded; context 500,000; max output 64,000; cost Unavailable | Eligible; context 2,000,000; max output 64,000; cost $2.096000 |
| 2,000,000 text | Excluded; context 500,000; max output 64,000; cost Unavailable | Eligible; context 2,000,000; max output 64,000; cost $4.096000 |
Verified 2026-04-06. Pricing provenance: Claude Opus 4.8 pricing (2026-06-07); Gemini 3.1 Pro pricing (2026-04-06). Capability: Claude Opus 4.8; Gemini 3.1 Pro. Provider: Anthropic; Google. Missing evidence is Unavailable, never inferred.
Claude Opus 4.8 vs Gemini 3.1 Pro sequential completion-and-cost frontier
Formula: n-step cost = n × per-step bill ÷ (1 − user-supplied retry rate); retry rate is explicit user input. TTFT and throughput are measured rows from SPEED_DATA, not concurrency benchmarks.
| Steps | Claude Opus 4.8 | Gemini 3.1 Pro |
|---|---|---|
| 5 steps (10K in / 2K out) | $0.500000 base; retry rate: user-supplied; 58 tokens/s; TTFT 470 ms; p95 53.36 tokens/s; n=5; completion 34.48s | $0.220000 base; retry rate: user-supplied; 55 tokens/s; TTFT 420 ms; p95 50.6 tokens/s; n=5; completion 36.36s |
| 10 steps (10K in / 2K out) | $1.000000 base; retry rate: user-supplied; 58 tokens/s; TTFT 470 ms; p95 53.36 tokens/s; n=5; completion 34.48s | $0.440000 base; retry rate: user-supplied; 55 tokens/s; TTFT 420 ms; p95 50.6 tokens/s; n=5; completion 36.36s |
| 20 steps (10K in / 2K out) | $2.000000 base; retry rate: user-supplied; 58 tokens/s; TTFT 470 ms; p95 53.36 tokens/s; n=5; completion 34.48s | $0.880000 base; retry rate: user-supplied; 55 tokens/s; TTFT 420 ms; p95 50.6 tokens/s; n=5; completion 36.36s |
Verified 2026-04-06. Pricing provenance: Claude Opus 4.8 pricing (2026-06-07); Gemini 3.1 Pro pricing (2026-04-06). Capability: Claude Opus 4.8; Gemini 3.1 Pro. Provider: Anthropic; Google. Missing evidence is Unavailable, never inferred.
Batch 60 · exact-pair decision contributions · verified 2026-09-07
Exact pair boundary: Anthropic / Google; model endpoint, 500K vs 2M context, multimodal input types, TTFT, and matched benchmark runs must join. Requested models are claude-opus-4-8 and gemini-3.1-pro. Provider, rate, pricing, and task pages remain fact owners.
Matched benchmark cost-per-passing-run table
Frozen Batch 60 scenario board. Formula / deterministic rule: cost_per_pass = run_tokens_cost / (accuracy / 100); accuracy and run tokens from first-party suite Boundary: Owns first-party matched premium test comparisons.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m1-r1constraint logic puzzle (Opus 100%, Gemini 100%) | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=constraint logic puzzle (Opus 100%, Gemini 100%); benchmark name; observed Opus result; observed Gemini result; latency comparison; cost per passing run; verdict rule; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — constraint logic puzzle (Opus 100%, Gemini 100%) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m1-r2median two sorted arrays (Opus 100%, Gemini 100%) | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=median two sorted arrays (Opus 100%, Gemini 100%); benchmark name; observed Opus result; observed Gemini result; latency comparison; cost per passing run; verdict rule; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — median two sorted arrays (Opus 100%, Gemini 100%) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m1-r3speed TTFT comparison | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=speed TTFT comparison; benchmark name; observed Opus result; observed Gemini result; latency comparison; cost per passing run; verdict rule; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — speed TTFT comparison is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m1-r4output tokens per second | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=output tokens per second; benchmark name; observed Opus result; observed Gemini result; latency comparison; cost per passing run; verdict rule; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — output tokens per second is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m1-r5extended thinking latency | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=extended thinking latency; benchmark name; observed Opus result; observed Gemini result; latency comparison; cost per passing run; verdict rule; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — extended thinking latency is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m1-r6unmatched synthetic benchmark | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=unmatched synthetic benchmark; benchmark name; observed Opus result; observed Gemini result; latency comparison; cost per passing run; verdict rule; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — unmatched synthetic benchmark is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
First-party provenance: Google Gemini API model documentation; verification date 2026-09-07. Missing or conflicting joins fail closed.
Context and modality eligibility matrix
Frozen Batch 60 scenario board. Formula / deterministic rule: eligible = tokens <= context && supported_modalities(input); Gemini supports native audio/video Boundary: Owns context fit (500K vs 2M) and native modality routing.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m2-r1250K text and image document | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=250K text and image document; input type; token length; Opus support; Gemini support; Gateway support; eligibility verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 250K text and image document is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m2-r2500K maximum Opus context | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=500K maximum Opus context; input type; token length; Opus support; Gemini support; Gateway support; eligibility verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 500K maximum Opus context is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m2-r31M video transcript and analysis | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=1M video transcript and analysis; input type; token length; Opus support; Gemini support; Gateway support; eligibility verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 1M video transcript and analysis is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m2-r42M extreme context dataset | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=2M extreme context dataset; input type; token length; Opus support; Gemini support; Gateway support; eligibility verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 2M extreme context dataset is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m2-r5native audio streaming | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=native audio streaming; input type; token length; Opus support; Gemini support; Gateway support; eligibility verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — native audio streaming is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m2-r6unsupported container format | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=unsupported container format; input type; token length; Opus support; Gemini support; Gateway support; eligibility verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — unsupported container format has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
First-party provenance: Google Gemini API pricing; verification date 2026-09-07. Missing or conflicting joins fail closed.
Sequential completion and tool latency frontier
Frozen Batch 60 scenario board. Formula / deterministic rule: workflow_latency = sum(ttft + tokens_out / tok_per_sec) * step_count; retry rate is user-supplied Boundary: Owns multi-turn agentic completion time modeling.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m3-r15-step agentic loop | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=5-step agentic loop; step count; estimated TTFT; tokens generated; Opus duration; Gemini duration; latency frontier status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 5-step agentic loop is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m3-r210-step complex refactor | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=10-step complex refactor; step count; estimated TTFT; tokens generated; Opus duration; Gemini duration; latency frontier status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 10-step complex refactor is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m3-r320-step document pipeline | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=20-step document pipeline; step count; estimated TTFT; tokens generated; Opus duration; Gemini duration; latency frontier status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 20-step document pipeline is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m3-r4high concurrency load | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=high concurrency load; step count; estimated TTFT; tokens generated; Opus duration; Gemini duration; latency frontier status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — high concurrency load is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m3-r5rate limit throttling | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=rate limit throttling; step count; estimated TTFT; tokens generated; Opus duration; Gemini duration; latency frontier status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — rate limit throttling is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch60-claude-opus-4-8-vs-gemini-3-1-pro-m3-r6unmeasured speed state | pair=claude-opus-4-8 vs gemini-3.1-pro; provider=Anthropic / Google; hostA=api.anthropic.com; hostB=generativelanguage.googleapis.com; surfaceA=Messages API; surfaceB=Gemini API; requested/effective IDs=claude-opus-4-8,gemini-3.1-pro; scenario=unmeasured speed state; step count; estimated TTFT; tokens generated; Opus duration; Gemini duration; latency frontier status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — unmeasured speed state 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 2026-09-07. 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-gemini-3-1-pro Batch 60 scenario →
How do Claude Opus 4.8 and Gemini 3.1 Pro compare on specs?
| Claude Opus 4.8 | Gemini 3.1 Pro | |
|---|---|---|
| Price (input) | $5.00/M | $2.00/M ✓ |
| Price (output) | $25.00/M | $12.00/M ✓ |
| Blended price | $10.00/M | $4.50/M ✓ |
| Context window | 500,000 tokens | 2,000,000 tokens ✓ |
| Max output | 64,000 tokens | 64,000 tokens |
| Modalities | text, vision | text, vision, audio |
| Reasoning mode | Yes | Yes |
| Released | 2026-04 | 2026-02 |
| Speed | 58 t/s ✓ | 55 t/s |
How much do Claude Opus 4.8 and Gemini 3.1 Pro cost at scale?
| Tokens / month | Claude Opus 4.8 | Gemini 3.1 Pro | Delta |
|---|---|---|---|
| 1,000,000 | $10.00 | $4.50 | $5.50 (2.2×) |
| 10,000,000 | $100.00 | $45.00 | $55.00 (2.2×) |
| 100,000,000 | $1000.00 | $450.00 | $550.00 (2.2×) |
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 Gemini 3.1 Pro if…
- ✓Largest context window of any current model (2M tokens)
- ✓Native audio and video understanding
- ✓Google Search grounding
- ✓Whole-codebase, whole-document, or long-video analysis in a single request.
Run this exact matchup right now
Send the same prompt to Claude Opus 4.8 and Gemini 3.1 Pro side by side and see the outputs yourself.
Try Claude Opus 4.8 vs Gemini 3.1 Pro FreeWhat are common questions about Claude Opus 4.8 and Gemini 3.1 Pro?
Is Claude Opus 4.8 cheaper than Gemini 3.1 Pro?
Gemini 3.1 Pro is cheaper, at $4.50 per million blended tokens vs $10.00 for Claude Opus 4.8.
Which has the bigger context window, Claude Opus 4.8 or Gemini 3.1 Pro?
Gemini 3.1 Pro has the larger context window: 2,000,000 tokens vs 500,000.
Can Claude Opus 4.8 replace Gemini 3.1 Pro for coding?
Both are viable for coding. Elite coding and multi-step reasoning (Claude Opus 4.8) vs Largest context window of any current model (2M tokens) (Gemini 3.1 Pro) — pick based on which strength matters more for your workload.
Which is faster, Claude Opus 4.8 or Gemini 3.1 Pro?
Claude Opus 4.8 is faster: 58 t/s vs 55 t/s, measured on our speed benchmarks.
Neither of these? See Claude Opus 4.8 alternatives or Gemini 3.1 Pro alternatives.
What related comparisons help choose between Claude Opus 4.8 and Gemini 3.1 Pro?
Claude Opus 4.8 pricingGemini 3.1 Pro pricingvs Claude Opus 4vs DeepSeek V4 Provs Gemini 3.7 Flashvs GPT-5.6 SolPremium model tests
Pricing verified 2026-04-06. Specs verified 2026-08-14.