GPT-5.5 vs GPT-6 Astra
Head to head on 19 shared benchmarks, with price, context window, and release dates.
Benchmark scores
69evals · sort by any column, ⤢ to expand fullscreen
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| GPT-6 Astra OpenAI | 41.4% | 92.0% | 2164elo | 82.8 | 100.0% | 53.5% | 53.3% | 97.6% | 96.1% | 63.4% | 54.7% | 48.5% | 87.9% | 99.0% | 46.4% | 56.5% | 57.9% | 66.6% | 89.6% | 59.3% | - | - | 95.0% | 98.5% | 99.9% | 95.9% | - | 91.5% | - | - | - | 74.1% | - | 42.4% | - | - | - | 37.8% | - | - | - | 60.3% | - | - | - | - | - | - | - | - | - | - | 96.3% | 0.84 | 72.6% | - | - | - | 92.7% | 85.4% | - | 88.0% | - | - | - | - | 64.6% | - | - | 74.5% |
| GPT-5.5 OpenAI | 12.9% | 84.0% | 1844elo | 78.2 | 34.0% | 51.8% | 5.7% | 51.7% | 93.5% | 51.8% | 45.8% | 49.1% | 86.9% | 50.0% | 51.5% | 56.1% | 83.4% | 57.4% | 69.8% | - | 86.2% | 54.2% | - | - | - | - | 36.2% | - | 68.4% | 90.0% | 100.0% | - | 1315elo | - | 44.8% | 24.9% | 1769elo | - | 15.1% | 75.9% | 2.1% | - | 84.7% | 82.5% | 81.1% | 73.0% | 87.7% | 96.3% | 87.7% | 92.8% | 88.6% | 68.8% | - | - | - | 78.7% | 45.3% | 100.0% | - | - | 4.2 | - | 58.6% | 75.0% | 75.7% | 60.6% | - | 68.1% | 93.9% | 64.5% |
2 / 2 models
| Attribute | GPT-5.5 OpenAI | GPT-6 Astra OpenAI |
|---|---|---|
| Description | GPT-5.5 is an AI model from OpenAI. | 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 | GPT | GPT |
| Params | - | - |
| Open weights | closed | closed |
| License | proprietary | - |
| Released | 23 Apr 2026 | 3 Sep 2026 |
| Context | 1,050,000 | 1,050,000 |
| Input $/1M | $5.00 | $10.00 |
| Output $/1M | $30.00 | $50.00 |
| Cache read $/1M | $0.500 | $1.000 |
| Cache write $/1M | - | $12.500 |
| Speed | 0 tok/s | 63 tok/s |
| Latency | 0.00 s | 198.54 s |
| Modalities | file, image, text | file, image, text |
| Providers | - | openai |
| Publisher | OpenAI | OpenAI |
| Reported scores | GPQA Diamond93.5% (AA) Humanity's Last Exam (HLE)45.8% (AA) IFBench75.9% (AA) SciCode56.1% (AA) τ²-bench (Tau²-bench)93.9% (AA) |
FAQ
- Is GPT-5.5 or GPT-6 Astra better?
- Across the 19 benchmarks both models report on Sophon, GPT-6 Astra leads on 16 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do GPT-5.5 and GPT-6 Astra compare on GPQA Diamond?
- GPT-5.5 scores 93.5% and GPT-6 Astra scores 96.1% on GPQA Diamond.
- Which is cheaper, GPT-5.5 or GPT-6 Astra?
- GPT-5.5 is cheaper at $30.00 per million output tokens against $50.00 for GPT-6 Astra - about 1.7x.
- When were GPT-5.5 and GPT-6 Astra released?
- GPT-5.5 was released 23 Apr 2026 by OpenAI. GPT-6 Astra was released 3 Sep 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 evalsClaude Opus 4.6 vs GPT-5.528 shared evalsGPT-5.4 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-5.4 Mini 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 evalsGPT-5.5 vs gpt-oss-120b19 shared evalsClaude Opus 4.8 vs GPT-6 Astra19 shared evalsGPT-5 vs GPT-5.518 shared evalsClaude Fable 5 vs GPT-6 Astra18 shared evalsGemini 3.1 Pro Preview vs GPT-6 Astra16 shared evalsGPT-4o vs GPT-5.515 shared evalsClaude Opus 4.7 vs GPT-6 Astra14 shared evalsGLM 5.1 vs GPT-6 Astra14 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 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-4.1 vs GPT-5.512 shared evalsGPT-5.4 Mini vs GPT-6 Astra12 shared evalsClaude Sonnet 4.5 vs GPT-6 Astra11 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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