Pyyan / Compare / Claude Sonnet 5.5 vs GPT-6.1 Sol
Claude Sonnet 5.5 vs GPT-6.1 Sol
2 of 5Language Models · verified 1 Oct 2026
Claude Sonnet 5.5Anthropiccurrent
GPT-6.1 SolOpenAIcurrent| Specification | Claude Sonnet 5.5 | GPT-6.1 Sol |
|---|---|---|
| Summary | Above Opus 5.5 on Terminal-Bench, at half the input price. | Astra's score on DeepSWE, at a fifth of Astra's cost. |
| Context | 1M | 1.05M |
| Input ($/Mtok) | $2 | $2 |
| Output ($/Mtok) | $10 | $10 |
| Licence | Proprietary | Proprietary |
| Max output | 128K | 128K |
| Parameters | Not published | Not published |
| Released | 28 Sep 2026 | 29 Sep 2026 |
| Model ID | claude-sonnet-5-5 | gpt-6.1-sol |
| Category | Language Models | Language Models |
| Official | Anthropic ↗ | OpenAI ↗ |
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-6.1 Sol
- Matches GPT-6 Astra on DeepSWE v1.1 at roughly a fifth of the cost
- $5.47 per Terminal-Bench Science task against $23.80 for Astra
- Above 272K tokens a prompt bills at 2x input and 1.5x output for the whole request
Best for coding and agent work at volume.