Claude Sonnet 4.5 vs GPT-6 Astra
Head to head on 11 shared benchmarks, with price, context window, and release dates.
Benchmark scores
107evals · sort by any column, ⤢ to expand fullscreen
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| GPT-6 Astra OpenAI | 2164elo | 82.8 | 97.6% | 96.1% | 54.7% | 48.5% | 87.9% | 99.0% | 46.4% | 56.5% | 89.6% | - | 59.3% | - | - | - | - | - | 95.0% | 98.5% | 99.9% | - | 41.4% | - | 95.9% | 91.5% | - | - | - | - | 92.0% | 74.1% | - | - | 100.0% | 42.4% | - | - | 53.5% | 53.3% | - | 37.8% | - | - | - | - | - | 63.4% | - | - | - | - | - | - | 60.3% | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 96.3% | 0.84 | 72.6% | - | - | - | - | - | - | - | - | 92.7% | 85.4% | - | - | 88.0% | - | - | - | - | - | - | - | - | - | - | 57.9% | - | 64.6% | - | 66.6% | - | - | - | 74.5% |
| Claude Sonnet 4.5 Anthropic | 1674elo | 71.4 | 15.2% | 83.4% | 17.8% | 40.6% | 84.5% | 19.0% | 32.9% | 45.7% | 22.6% | 0.0% | - | 0.0% | 88.0% | 100 | 0.0% | 0.0% | - | - | - | 0.0% | - | 5.0% | - | - | 0.0% | 60.8% | 0.0% | 0.0% | - | - | 0.0% | 0.0% | - | - | 0.0% | 0.0% | - | - | 0.0% | - | 0.0% | 83.9% | 0.0% | 0.0% | 0.0% | - | 0.0% | 0.0% | 87.5% | 57.3% | 83.8% | 0.0% | - | 0.0% | 70.7% | 80.4% | 57.0% | 53.4% | 76.5% | 79.3% | 77.6% | 71.4% | 0.75 | 0.75 | 0.0% | 0 | 0 | 87.5% | 64.0% | 0.0% | 0.0% | - | - | - | 62.9% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | - | - | 0.0% | 0 | - | 0.0% | 0.0% | 77.2% | 67.0% | 74.8% | 0.0% | 0 | 0 | 73.3% | 50.34 | - | 35.6% | - | 0 | - | 0.0% | 1.49 | 78.1% | 29.2% |
2 / 2 models
| Attribute | Claude Sonnet 4.5 Anthropic | GPT-6 Astra OpenAI |
|---|---|---|
| Description | anthropic/claude-sonnet-4.5 is an AI model. | OpenAI's GPT-6 flagship, launched as its best computer-use model: it drives browsers, spreadsheets and desktop applications rather than answering questions about them. Built on OpenAI's largest training run to date and the first model it designates Critical for cybersecurity capability. Rolling out from Daybreak enterprise access to ChatGPT and the API; Pro, Business and Enterprise plans also get a GPT-6 Astra Pro tier. |
| Family | Claude | GPT |
| Params | Undisclosed (closed) | - |
| Open weights | closed | closed |
| License | proprietary | - |
| Released | 29 Sep 2025 | 3 Sep 2026 |
| Context | 1,000,000 | 1,050,000 |
| Input $/1M | $3.00 | $10.00 |
| Output $/1M | $15.00 | $50.00 |
| Cache read $/1M | $0.300 | $1.000 |
| Cache write $/1M | $3.750 | $12.500 |
| Speed | 0 tok/s | 63 tok/s |
| Latency | 0.00 s | 198.54 s |
| Modalities | text, image, file | file, image, text |
| Providers | anthropic, aws-bedrock, vertex-ai | openai |
| Publisher | Anthropic | OpenAI |
| Reported scores | TaxEval v273.3% LiveBench - Math79.3% (LiveBench) LiveBench - Coding80.4% (LiveBench) LiveBench - Language76.5% (LiveBench) LiveBench - Data Analysis57.0% (LiveBench) |
FAQ
- Is Claude Sonnet 4.5 or GPT-6 Astra better?
- Across the 11 benchmarks both models report on Sophon, GPT-6 Astra leads on 11 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Sonnet 4.5 and GPT-6 Astra compare on GPQA Diamond?
- Claude Sonnet 4.5 scores 83.4% and GPT-6 Astra scores 96.1% on GPQA Diamond.
- Which is cheaper, Claude Sonnet 4.5 or GPT-6 Astra?
- Claude Sonnet 4.5 is cheaper at $15.00 per million output tokens against $50.00 for GPT-6 Astra - about 3.3x.
- When were Claude Sonnet 4.5 and GPT-6 Astra released?
- Claude Sonnet 4.5 was released 29 Sep 2025 by Anthropic. GPT-6 Astra was released 3 Sep 2026 by OpenAI.
Other head-to-heads
56Claude Sonnet 4.5 vs GPT-4.1 Mini35 shared evalsClaude Opus 4.5 vs Claude Sonnet 4.534 shared evalsClaude Sonnet 4.5 vs GPT-5.232 shared evalsClaude Sonnet 4.5 vs GPT-5 Mini31 shared evalsClaude Sonnet 4.5 vs GPT-531 shared evalsClaude Sonnet 4.5 vs GPT-5 Nano31 shared evalsClaude 4 Sonnet vs Claude Sonnet 4.528 shared evalsClaude Opus 4.6 vs Claude Sonnet 4.528 shared evalsClaude Sonnet 4.5 vs Kimi K2.528 shared evalsClaude Sonnet 4.5 vs Grok 4.1 Fast28 shared evalsClaude Sonnet 4.5 vs Gemini 3.1 Pro Preview27 shared evalsClaude Sonnet 4.5 vs DeepSeek V3.227 shared evalsClaude Sonnet 4.5 vs GPT-5.526 shared evalsClaude Sonnet 4.5 vs GPT-5.426 shared evalsClaude Sonnet 4.5 vs Gemini 2.5 Pro26 shared evalsClaude Opus 4.8 vs Claude Sonnet 4.525 shared evalsClaude Sonnet 4.5 vs GLM 4.725 shared evalsClaude Fable 5 vs Claude Sonnet 4.524 shared evalsClaude Sonnet 4.5 vs Claude Sonnet 4.624 shared evalsClaude Opus 4.7 vs Claude Sonnet 4.524 shared evalsClaude Sonnet 4.5 vs GLM 5.123 shared evalsClaude Sonnet 4.5 vs gpt-oss-120b23 shared evalsClaude Sonnet 4.5 vs GPT-5.4 Mini23 shared evalsClaude Sonnet 4.5 vs Qwen3.6 Plus22 shared evalsClaude Sonnet 4.5 vs GPT-4o21 shared evalsClaude Sonnet 4.5 vs GPT-4.119 shared evalsGPT-5.5 vs GPT-6 Astra19 shared evalsClaude Opus 4.8 vs GPT-6 Astra19 shared evalsClaude Fable 5 vs GPT-6 Astra18 shared evalsClaude Sonnet 4.5 vs GPT-4o-mini17 shared evalsClaude Sonnet 4.5 vs GPT-4.1 Nano16 shared evalsGemini 3.1 Pro Preview vs GPT-6 Astra16 shared evalsClaude Opus 4.7 vs GPT-6 Astra14 shared evalsGLM 5.1 vs GPT-6 Astra14 shared evalsGPT-5.2 vs GPT-6 Astra13 shared evalsClaude Opus 4.6 vs GPT-6 Astra13 shared evalsGPT-5.4 vs GPT-6 Astra13 shared evalsGPT-6 Astra vs Kimi K2.513 shared evalsClaude Sonnet 4.6 vs GPT-6 Astra13 shared evalsGPT-5 Mini vs GPT-6 Astra12 shared evalsGPT-5 vs GPT-6 Astra12 shared evalsGPT-5.4 Mini vs GPT-6 Astra12 shared evalsClaude Opus 4.5 vs GPT-6 Astra11 shared evalsGPT-6 Astra vs Qwen3.6 Plus11 shared evalsGPT-5 Nano vs GPT-6 Astra10 shared evalsGemini 2.5 Pro vs GPT-6 Astra10 shared evalsGPT-6 Astra vs Grok 4.1 Fast10 shared evalsDeepSeek V3.2 vs GPT-6 Astra9 shared evalsGLM 4.7 vs GPT-6 Astra9 shared evalsClaude 4 Sonnet vs GPT-6 Astra8 shared evalsGPT-4.1 Mini vs GPT-6 Astra6 shared evalsGPT-4.1 Nano vs GPT-6 Astra6 shared evalsGPT-6 Astra vs gpt-oss-120b6 shared evalsGPT-4.1 vs GPT-6 Astra5 shared evalsGPT-4o-mini vs GPT-6 Astra4 shared evalsGPT-4o vs GPT-6 Astra4 shared evals
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