Claude 3.5 Sonnet vs GPT-5.5
Head to head on 14 shared benchmarks, with price, context window, and release dates.
Benchmark scores
68evals · sort by any column, ⤢ to expand fullscreen
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| GPT-5.5 OpenAI | 68.4% | 1845elo | 78.2 | 51.7% | 94.0% | 45.8% | 84.7% | 82.5% | 73.0% | 87.7% | 88.6% | 68.8% | 55.8% | 75.0% | - | - | - | - | 86.2% | 54.2% | - | 12.9% | 36.2% | 82.0% | 90.0% | 100.0% | - | 1295elo | 34.0% | 51.8% | 5.7% | 44.8% | 24.9% | 1769elo | 15.1% | - | 51.8% | 75.9% | - | 2.1% | 81.1% | 96.3% | 87.7% | - | - | 92.8% | 49.1% | 86.9% | 78.7% | 45.3% | 100.0% | 50.0% | - | 51.5% | 4.2 | - | - | - | 58.6% | 75.7% | 83.4% | 60.6% | - | 57.4% | 68.1% | 69.8% | - | 93.9% | 64.5% |
| Claude 3.5 Sonnet Anthropic | 53.6% | 1451elo | 58.4 | 2.1% | 55.3% | 4.1% | 63.7% | 65.6% | 69.2% | 56.4% | 77.2% | 64.1% | 36.6% | 70.2% | 51.6% | 15.7% | 3.3% | 52.4% | - | - | 24.2% | - | - | - | - | - | 28.0% | - | - | - | - | - | - | - | - | 96.4 | - | - | 0.0% | - | - | - | - | 38.1% | 77.1% | - | - | - | - | - | - | - | 0.0% | - | - | 51.3% | 25.3% | 63.4% | - | - | - | - | 0.98 | - | - | - | 62.6% | - | 42.7% |
2 / 2 models
| Attribute | Claude 3.5 Sonnet Anthropic | GPT-5.5 OpenAI |
|---|---|---|
| Description | Claude Sonnet 3.5 is an AI model from Anthropic. | GPT-5.5 is an AI model from OpenAI. |
| Family | Claude | GPT |
| Params | - | - |
| Open weights | closed | closed |
| License | proprietary | proprietary |
| Released | 22 Oct 2024 | 23 Apr 2026 |
| Context | 200,000 | 1,050,000 |
| Input $/1M | $3.00 | $5.00 |
| Output $/1M | $15.00 | $30.00 |
| Cache read $/1M | - | $0.500 |
| Cache write $/1M | - | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image | file, image, text |
| Providers | - | - |
| Publisher | Anthropic | OpenAI |
| Reported scores | MortgageTax64.1% Traveling Salesman0.98 (3 samples) SWE-bench Verified63.4% (SWE-bench) SWE-bench Lite51.3% (SWE-bench) SWE-bench Multimodal25.3% (SWE-bench) | GPQA Diamond94.0% Humanity's Last Exam (HLE)45.8% (AA) IFBench75.9% (AA) SciCode55.8% τ²-bench (Tau²-bench)93.9% (AA) |
FAQ
- Is Claude 3.5 Sonnet or GPT-5.5 better?
- Across the 14 benchmarks both models report on Sophon, GPT-5.5 leads on 14 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude 3.5 Sonnet and GPT-5.5 compare on GPQA Diamond?
- Claude 3.5 Sonnet scores 55.3% and GPT-5.5 scores 94.0% on GPQA Diamond.
- Which is cheaper, Claude 3.5 Sonnet or GPT-5.5?
- Claude 3.5 Sonnet is cheaper at $15.00 per million output tokens against $30.00 for GPT-5.5 - about 2.0x.
- When were Claude 3.5 Sonnet and GPT-5.5 released?
- Claude 3.5 Sonnet was released 22 Oct 2024 by Anthropic. GPT-5.5 was released 23 Apr 2026 by OpenAI.
Other head-to-heads
56Gemini 3.1 Pro Preview vs GPT-5.541 shared evalsClaude Opus 4.8 vs GPT-5.541 shared evalsClaude Fable 5 vs GPT-5.539 shared evalsClaude Opus 4.7 vs GPT-5.532 shared evalsGLM 5.1 vs GPT-5.531 shared evalsClaude Sonnet 4.6 vs GPT-5.530 shared evalsGPT-5.4 vs GPT-5.528 shared evalsClaude Opus 4.6 vs GPT-5.528 shared evalsGPT-5.5 vs Kimi K2.528 shared evalsGPT-5.2 vs GPT-5.527 shared evalsClaude Sonnet 4.5 vs GPT-5.526 shared evalsGPT-5 Mini vs GPT-5.525 shared evalsClaude Opus 4.5 vs GPT-5.525 shared evalsGPT-5.5 vs Qwen3.6 Plus25 shared evalsGPT-5.5 vs Grok 4.1 Fast25 shared evalsGPT-5 Nano vs GPT-5.523 shared evalsClaude 4 Sonnet vs GPT-5.523 shared evalsDeepSeek V3.2 vs GPT-5.523 shared evalsGemini 2.5 Pro vs GPT-5.522 shared evalsGLM 4.7 vs GPT-5.522 shared evalsClaude 3.5 Sonnet vs GPT-4o22 shared evalsClaude 3.5 Sonnet vs Claude 4 Sonnet21 shared evalsClaude 3.5 Sonnet vs Gemini 2.5 Pro21 shared evalsClaude 3.5 Sonnet vs Claude Sonnet 4.519 shared evalsClaude 3.5 Sonnet vs GPT-5 Mini19 shared evalsGPT-5.5 vs GPT-6 Astra19 shared evalsGPT-5.5 vs gpt-oss-120b19 shared evalsClaude 3.5 Sonnet vs GPT-4o-mini19 shared evalsGPT-5 vs GPT-5.518 shared evalsClaude 3.5 Sonnet vs GPT-4.118 shared evalsClaude 3.5 Sonnet vs GPT-4.1 Mini17 shared evalsClaude 3.5 Sonnet vs GPT-517 shared evalsClaude 3.5 Sonnet vs GPT-5 Nano17 shared evalsClaude 3.5 Sonnet vs GPT-5.217 shared evalsClaude 3.5 Sonnet vs Claude Opus 4.517 shared evalsClaude 3.5 Sonnet vs DeepSeek V3.217 shared evalsClaude 3.5 Sonnet vs GPT-4.1 Nano16 shared evalsClaude 3.5 Sonnet vs gpt-oss-120b16 shared evalsGPT-4o vs GPT-5.515 shared evalsClaude 3.5 Sonnet vs Kimi K2.515 shared evalsClaude 3.5 Sonnet vs Grok 4.1 Fast15 shared evalsClaude 3.5 Sonnet vs GLM 4.715 shared evalsClaude 3.5 Sonnet vs Claude Opus 4.614 shared evalsGPT-4.1 Mini vs GPT-5.513 shared evalsGPT-4o-mini vs GPT-5.513 shared evalsGPT-4.1 Nano vs GPT-5.513 shared evalsClaude 3.5 Sonnet vs Gemini 3.1 Pro Preview13 shared evalsClaude 3.5 Sonnet vs Claude Opus 4.813 shared evalsClaude 3.5 Sonnet vs GPT-5.413 shared evalsClaude 3.5 Sonnet vs GLM 5.113 shared evalsClaude 3.5 Sonnet vs Claude Sonnet 4.613 shared evalsClaude 3.5 Sonnet vs Claude Opus 4.713 shared evalsGPT-4.1 vs GPT-5.512 shared evalsClaude 3.5 Sonnet vs Claude Fable 512 shared evalsClaude 3.5 Sonnet vs Qwen3.6 Plus11 shared evalsClaude 3.5 Sonnet vs GPT-6 Astra6 shared evals
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