Model comparison
Claude Sonnet 5.5 vs GPT-6.1 Sol
Both charge the same for input tokens. Claude Sonnet 5.5 lists $2 in and $10 out per million tokens with a 1M context window; GPT-6.1 Sol lists $2 and $10 with 1.05M.
| Claude Sonnet 5.5 | GPT-6.1 Sol | |
|---|---|---|
| Developer | Anthropic | OpenAI |
| Input / 1M tokens | $2 | $2 |
| Output / 1M tokens | $10 | $10 |
| Context window | 1M | 1.05M |
| Max output | 128K | 128K |
| Modality | Multimodal | Multimodal |
| Open weights | No | No |
| Released | 2026-09-28 | 2026-09-29 |
| Source | Provider documentation | Provider documentation |
| Illustrative month* | $120 | $120 |
* 100 calls a day, about 10,000 tokens in and 2,000 out each, at list price, before caching, batching or volume discounts. Illustrative only. Pricing and context data verified 2026-10-11; "Secondary" figures come from pricing aggregators and trade press, so check the provider before relying on them. No benchmark scores: see methodology.
Claude Sonnet 5.5
The speed and intelligence balance point of Anthropic's current line, at $2 / $10. The natural default for production applications that do not need Opus-level depth.
- Watch: Forced tool use (tool_choice any and tool) returns a 400 error
- Watch: Thinking blocks only work in the account that produced them
GPT-6.1 Sol
OpenAI's mid tier, pitched as near-Astra performance for complex work at a fifth of the price. It replaced GPT-6 Sol a week after that model launched, at the same $2 / $10 with cheaper cached input.
GPT-6.1 Sol in full →Other comparisons