Pyyan / Compare / Claude Sonnet 5.5 vs GPT-6 Astra
Claude Sonnet 5.5 vs GPT-6 Astra
2 of 5Language Models · verified 29 Sept 2026
Claude Sonnet 5.5Anthropiccurrent
GPT-6 AstraOpenAIcurrent| Specification | Claude Sonnet 5.5 | GPT-6 Astra |
|---|---|---|
| Summary | Above Opus 5.5 on Terminal-Bench, at half the input price. | Saturates three of the benchmarks it reports, and ships disabled for enterprise. |
| Context | 1M | 1.05M |
| Input ($/Mtok) | $2 | $10 |
| Output ($/Mtok) | $10 | $50 |
| Licence | Proprietary | Proprietary |
| Max output | 128K | 128K |
| Parameters | Not published | Not published |
| Released | 28 Sep 2026 | 3 Sep 2026 |
| Model ID | claude-sonnet-5-5 | gpt-6-astra |
| Category | Language Models | Language Models |
| Official | Anthropic ↗ | — |
Highlighted rows are where these differ.
Claude Sonnet 5.5
- 70.6% on Terminal-Bench 4.0, against 66.4% for Opus 5.5 six days earlier
- 1844 on GDPval-AA, level with Opus 5.5's 1846
- More than 30% faster than Sonnet 5, and Anthropic says up to 30% less per task on tokens
Best for agentic coding at volume.
GPT-6 Astra
- 97.6% on FrontierMath Tier 4, 99.9% on ARC-AGI-3 and 100% on ExploitBench
- Above 272K input tokens the whole request reprices: input and cache at 2x, output at 1.5x
- Rolls out to OpenAI's Daybreak cyber programme first, and arrives switched off for enterprise
Best for hard reasoning and computer use.