GPT-4.1 vs Claude Sonnet 3.5 v2 vs Claude Sonnet 3.7
Too close to call on our weighted score (GPT-4.1 53, Claude Sonnet 3.7 50, Claude Sonnet 3.5 v2 44). The right pick depends on what you value most.
OpenAIGPT-4.1
53/100- ECI136.8
- Price$2.00 / $8.00
- Context1.05M
AnthropicClaude Sonnet 3.5 v2
44/100- ECI133.5
- Price$3.00 / $15.00
- Context200K
- Anthropic
Claude Sonnet 3.7
50/100- ECI141.2
- Price$3.00 / $15.00
- Context200K
Too close to call
It is close. Our weighted score puts them within 3 points (GPT-4.1 53/100, Claude Sonnet 3.7 50/100, Claude Sonnet 3.5 v2 44/100), so choose by what matters most for your work: Claude Sonnet 3.7 for raw capability, GPT-4.1 on price and GPT-4.1 for long inputs. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
- CapabilityClaude Sonnet 3.7Capabilities Index (ECI): Claude Sonnet 3.7 141.2 · GPT-4.1 136.8 · Claude Sonnet 3.5 v2 133.5
- Lowest priceGPT-4.1GPT-4.1 $3.50 · Claude Sonnet 3.5 v2 $6.00 · Claude Sonnet 3.7 $6.00 per 1M tokens (3:1 blend)
- Longest contextGPT-4.1GPT-4.1 1,047,576 · Claude Sonnet 3.5 v2 200,000 · Claude Sonnet 3.7 200,000 tokens
- Widest inputsSame inputsGPT-4.1: Text, Images, PDFs · Claude Sonnet 3.5 v2: Text, Images, PDFs · Claude Sonnet 3.7: Text, Images, PDFs
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | GPT-4.1 | Claude Sonnet 3.5 v2 | Claude Sonnet 3.7 |
|---|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 61 | 57 | 67 |
| Price | 25% | 24 | 13 | 13 |
| Inputs & features | 15% | 70 | 60 | 70 |
| Context window | 10% | 61 | 32 | 32 |
| Overall | 100% | 53/100 | 44/100 | 50/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GPT-4.1OpenAI | Claude Sonnet 3.5 v2Anthropic | Claude Sonnet 3.7Anthropic |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 136.8 | 133.5 | 141.2 (best) |
| ECI rank | #111 of 148 | #119 of 148 | #96 of 148 (best) |
| GPQA DiamondGraduate-level science questions | 66.9% | 55.3% | 79.7% (best) |
| FrontierMath Tiers 1–3Research-level mathematics | 6.0% | — | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 38.3% | 8.5% | 57.8% (best) |
| SWE-bench VerifiedFixing real GitHub issues | 48.5% | — | 61.0% (best) |
| SimpleQA VerifiedShort factual questions | 31.1% | — | — |
| Price per million tokens | |||
| Input | $2.00 (best) | $3.00 | $3.00 |
| Output | $8.00 (best) | $15.00 | $15.00 |
| Cached input | $0.50 | — | — |
| Blended (3:1) | $3.50 (best) | $6.00 | $6.00 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official OpenAI API | Median of 1 providers | Median of 3 providers |
| Limits | |||
| Context window | 1,047,576 tokens (best) | 200,000 tokens | 200,000 tokens |
| Max output | 32,768 tokens | 8,192 tokens | 64,000 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | Yes | Yes | Yes |
| Audio | No | No | No |
| Video | No | No | No |
| Reasoning | No | No | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | No | No |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | gpt-4.1 | — | — |
| API providers | 25 (best) | 1 | 3 |
| Released | Apr 14, 2025 | Oct 22, 2024 | Feb 19, 2025 |
| Knowledge cutoff | Apr 2024 | Apr 30, 2024 | Oct 31, 2024 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- GPT-4.1$36.00
- Claude Sonnet 3.5 v2$60.00
- Claude Sonnet 3.7$60.00
Which should you choose?
Which is better: GPT-4.1, Claude Sonnet 3.5 v2 or Claude Sonnet 3.7?
It is close. Our weighted score puts them within 3 points (GPT-4.1 53/100, Claude Sonnet 3.7 50/100, Claude Sonnet 3.5 v2 44/100), so choose by what matters most for your work: Claude Sonnet 3.7 for raw capability, GPT-4.1 on price and GPT-4.1 for long inputs. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
Which is cheaper, GPT-4.1, Claude Sonnet 3.5 v2 or Claude Sonnet 3.7?
GPT-4.1 is cheaper at $2.00 input / $8.00 output per million tokens (official OpenAI API price). Claude Sonnet 3.5 v2 costs $3.00 input / $15.00 output per million tokens (median across 1 API provider); Claude Sonnet 3.7 costs $3.00 input / $15.00 output per million tokens (median across 3 API providers). At a typical mix of three input tokens to one output token, that is $3.50 per million tokens for GPT-4.1 versus $6.00 for Claude Sonnet 3.5 v2 (1.7× as much) and $6.00 for Claude Sonnet 3.7 (1.7× as much).
Which scores higher on benchmarks?
Claude Sonnet 3.7 scores higher on the Capabilities Index (ECI): Claude Sonnet 3.7 141.2 (#96 of 148), GPT-4.1 136.8 (#111 of 148) and Claude Sonnet 3.5 v2 133.5 (#119 of 148). Their confidence ranges do not overlap (138.7–142.9 vs 133.6–138.4), so the gap is a real one. On individual benchmarks: GPQA Diamond — Claude Sonnet 3.7 79.7%, GPT-4.1 66.9%, Claude Sonnet 3.5 v2 55.3%; OTIS Mock AIME 2024–2025 — Claude Sonnet 3.7 57.8%, GPT-4.1 38.3%, Claude Sonnet 3.5 v2 8.5%.
Which is better for coding?
There are no published SWE-bench Verified results for Claude Sonnet 3.5 v2 yet, so there is no like-for-like coding score. On overall capability, Claude Sonnet 3.7 leads, which tends to carry over to coding, but test on your own codebase. All three support tool calling for agent workflows.
Which has the bigger context window?
GPT-4.1 has the largest context window at 1,047,576 tokens, against 200,000 for Claude Sonnet 3.5 v2 and 200,000 for Claude Sonnet 3.7. Maximum output per response: GPT-4.1 up to 32,768, Claude Sonnet 3.5 v2 up to 8,192, Claude Sonnet 3.7 up to 64,000 tokens.
Which can read images, PDFs, audio or video?
GPT-4.1 accepts text, images and PDFs; Claude Sonnet 3.5 v2 accepts text, images and PDFs; Claude Sonnet 3.7 accepts text, images and PDFs. They handle the same number of input types.
Are any of these open source?
No. GPT-4.1, Claude Sonnet 3.5 v2 and Claude Sonnet 3.7 are proprietary and only available through APIs and apps.
Which is newer?
GPT-4.1 is the newest, released Apr 14, 2025. Claude Sonnet 3.7 came out Feb 19, 2025; Claude Sonnet 3.5 v2 came out Oct 22, 2024. Knowledge cutoff: GPT-4.1 Apr 2024, Claude Sonnet 3.5 v2 Apr 30, 2024, Claude Sonnet 3.7 Oct 31, 2024.
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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