Claude Opus 4.5 vs GPT-5.1 vs Gemini 3 Pro Preview
Gemini 3 Pro Preview comes out ahead, 67 to 60 and 55 on our weighted score, though GPT-5.1 is 24% cheaper per token.
AnthropicClaude Opus 4.5
55/100- ECI150.1
- Price$5.00 / $25.00
- Context200K
OpenAIGPT-5.1
60/100- ECI149.7
- Price$1.25 / $10.00
- Context400K
- Our pick
GoogleGemini 3 Pro Preview
67/100- ECI153.0
- Price$2.00 / $12.00
- Context1.05M
Gemini 3 Pro Preview is our pick
Gemini 3 Pro Preview is the better all-round choice, scoring 67/100 against GPT-5.1 (60) and Claude Opus 4.5 (55). It leads on capability, inputs & features and context window. GPT-5.1 wins on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
- CapabilityGemini 3 Pro PreviewCapabilities Index (ECI): Gemini 3 Pro Preview 153.0 · Claude Opus 4.5 150.1 · GPT-5.1 149.7
- Lowest priceGPT-5.1GPT-5.1 $3.44 · Gemini 3 Pro Preview $4.50 · Claude Opus 4.5 $10.00 per 1M tokens (3:1 blend)
- Longest contextGemini 3 Pro PreviewGemini 3 Pro Preview 1,048,576 · GPT-5.1 400,000 · Claude Opus 4.5 200,000 tokens
- Widest inputsGemini 3 Pro PreviewClaude Opus 4.5: Text, Images, PDFs · GPT-5.1: Text, Images · Gemini 3 Pro Preview: Text, Images, PDFs, Audio, Video
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | Claude Opus 4.5 | GPT-5.1 | Gemini 3 Pro Preview |
|---|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 78 | 78 | 82 |
| Price | 25% | 2 | 24 | 19 |
| Inputs & features | 15% | 80 | 70 | 100 |
| Context window | 10% | 32 | 44 | 61 |
| Overall | 100% | 55/100 | 60/100 | 67/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Claude Opus 4.5Anthropic | GPT-5.1OpenAI | Gemini 3 Pro PreviewGoogle |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 150.1 | 149.7 | 153.0 (best) |
| ECI rank | #48 of 148 | #52 of 148 | #39 of 148 (best) |
| GPQA DiamondGraduate-level science questions | 86.1% | 87.6% | 92.6% (best) |
| FrontierMath Tiers 1–3Research-level mathematics | 34.4% | — | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 86.1% | 88.6% | 91.4% (best) |
| SWE-bench VerifiedFixing real GitHub issues | 76.7% (best) | 68.0% | 72.9% |
| SimpleQA VerifiedShort factual questions | 45.7% | 48.0% (best) | — |
| Price per million tokens | |||
| Input | $5.00 | $1.25 (best) | $2.00 |
| Output | $25.00 | $10.00 (best) | $12.00 |
| Cached input | $0.50 | $0.125 (best) | — |
| Blended (3:1) | $10.00 | $3.44 (best) | $4.50 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official Anthropic API | Official OpenAI API | Median of 2 providers |
| Limits | |||
| Context window | 200,000 tokens | 400,000 tokens | 1,048,576 tokens (best) |
| Max output | 64,000 tokens | 128,000 tokens (best) | 65,536 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | Yes | No | Yes |
| Audio | No | No | Yes |
| Video | No | No | Yes |
| Reasoning | Yeslow · medium · high | Yeslow · medium · high | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | Yes | Yes |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | claude-opus-4-5 | gpt-5.1 | — |
| API providers | 28 (best) | 21 | 3 |
| Released | Nov 24, 2025 | Nov 13, 2025 | Nov 18, 2025 |
| Knowledge cutoff | May 2025 | Sep 30, 2024 | Jan 2025 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Claude Opus 4.5$100.00
- GPT-5.1$32.50
- Gemini 3 Pro Preview$44.00
Which should you choose?
Which is better: Claude Opus 4.5, GPT-5.1 or Gemini 3 Pro Preview?
Gemini 3 Pro Preview is the better all-round choice, scoring 67/100 against GPT-5.1 (60) and Claude Opus 4.5 (55). It leads on capability, inputs & features and context window. GPT-5.1 wins on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
Which is cheaper, Claude Opus 4.5, GPT-5.1 or Gemini 3 Pro Preview?
GPT-5.1 is cheaper at $1.25 input / $10.00 output per million tokens (official OpenAI API price). Gemini 3 Pro Preview costs $2.00 input / $12.00 output per million tokens (median across 2 API providers); Claude Opus 4.5 costs $5.00 input / $25.00 output per million tokens (official Anthropic API price). At a typical mix of three input tokens to one output token, that is $3.44 per million tokens for GPT-5.1 versus $4.50 for Gemini 3 Pro Preview (1.3× as much) and $10.00 for Claude Opus 4.5 (2.9× as much).
Which scores higher on benchmarks?
Gemini 3 Pro Preview scores higher on the Capabilities Index (ECI): Gemini 3 Pro Preview 153.0 (#39 of 148), Claude Opus 4.5 150.1 (#48 of 148) and GPT-5.1 149.7 (#52 of 148). The confidence ranges of the top two overlap (150.6–155.2 vs 147.9–153.0), so treat the gap as small. On individual benchmarks: GPQA Diamond — Gemini 3 Pro Preview 92.6%, GPT-5.1 87.6%, Claude Opus 4.5 86.1%; OTIS Mock AIME 2024–2025 — Gemini 3 Pro Preview 91.4%, GPT-5.1 88.6%, Claude Opus 4.5 86.1%; SWE-bench Verified — Claude Opus 4.5 76.7%, Gemini 3 Pro Preview 72.9%, GPT-5.1 68.0%.
Which is better for coding?
Claude Opus 4.5 resolves more real GitHub issues on SWE-bench Verified: Claude Opus 4.5 76.7%, Gemini 3 Pro Preview 72.9% and GPT-5.1 68.0%. All three support tool calling for agent workflows.
Which has the bigger context window?
Gemini 3 Pro Preview has the largest context window at 1,048,576 tokens, against 400,000 for GPT-5.1 and 200,000 for Claude Opus 4.5. Maximum output per response: Claude Opus 4.5 up to 64,000, GPT-5.1 up to 128,000, Gemini 3 Pro Preview up to 65,536 tokens.
Which can read images, PDFs, audio or video?
Claude Opus 4.5 accepts text, images and PDFs; GPT-5.1 accepts text and images; Gemini 3 Pro Preview accepts text, images, PDFs, audio and video. Gemini 3 Pro Preview handles the widest range of inputs.
Are any of these open source?
No. Claude Opus 4.5, GPT-5.1 and Gemini 3 Pro Preview are proprietary and only available through APIs and apps.
Which is newer?
Claude Opus 4.5 is the newest, released Nov 24, 2025. Gemini 3 Pro Preview came out Nov 18, 2025; GPT-5.1 came out Nov 13, 2025. Knowledge cutoff: Claude Opus 4.5 May 2025, GPT-5.1 Sep 30, 2024, Gemini 3 Pro Preview Jan 2025.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.
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