Pyyan / Compare / Claude Sonnet 5 vs GPT-6.1 Sol
Claude Sonnet 5 vs GPT-6.1 Sol
2 of 5Language Models · verified 1 Oct 2026
Claude Sonnet 5Anthropiccurrent
GPT-6.1 SolOpenAIcurrent| Specification | Claude Sonnet 5 | GPT-6.1 Sol |
|---|---|---|
| Summary | Near-Opus quality on coding and agentic work at Sonnet cost. | Astra's score on DeepSWE, at a fifth of Astra's cost. |
| Context | 1M | 1.05M |
| Input ($/Mtok) | $3 | $2 |
| Output ($/Mtok) | $15 | $10 |
| Licence | Proprietary | Proprietary |
| Max output | 128K | 128K |
| Parameters | — | Not published |
| Released | — | 29 Sep 2026 |
| Model ID | claude-sonnet-5 | gpt-6.1-sol |
| Category | Language Models | Language Models |
| Official | Anthropic ↗ | OpenAI ↗ |
Highlighted rows are where these differ.
Claude Sonnet 5
- Adaptive thinking on by default
- New tokenizer — roughly 30% more tokens for the same text
- Introductory $2/$10 through 31 Aug 2026
Best for high-volume production.
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.