Head to head · OpenRouter
Identical on paper where it counts: both list $2 in / $10 out per million, a ~1M-token window, a 128K output ceiling and text, image and file input. The difference is the vendor line — Anthropic's balanced tier against OpenAI's mid-tier — and the cache price, where Claude's cached read is $0.10 against OpenAI's $0.10.
There is no price argument here, which makes it a rare clean A/B: run your own prompts through both and pick on output. The catalogue's own positioning says Sonnet 5.5 is for well-scoped everyday work and GPT-6.1 Sol for agentic coding and document-heavy professional work — that is a hint about the intended shape of the workload, not a benchmark.
| Field | Claude Sonnet 5.5 | GPT-6.1 Sol |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Context window | 1M tokens | 1.05M tokens |
| Input / 1M | $2.00 | $2.00 |
| Output / 1M | $10.00 | $10.00 |
| Modalities | Text, Vision, Files | Text, Vision, Files |
| Best for | Overall, Coding, Agents | Overall, Coding, Agents |
openrouter.ai/api/v1/models Verified 2026-10-10 | Workload | Input | Output | Claude Sonnet 5.5 | GPT-6.1 Sol |
|---|---|---|---|---|
| Quick test | 20,000 | 5,000 | $0.090 | $0.090 |
| Product chat month | 500,000 | 125,000 | $2.25 | $2.25 |
| Document batch | 5,000,000 | 1,000,000 | $20.00 | $20.00 |
Estimates use list input/output prices and exclude cache discounts, provider surcharges and tool fees.
Claude Sonnet 5.5 costs $2.00 input and $10.00 output per 1M tokens. GPT-6.1 Sol costs $2.00 input and $10.00 output per 1M tokens.
Claude Sonnet 5.5 offers 1M tokens; GPT-6.1 Sol offers 1.05M tokens. Provider-specific limits can vary by route.
There is no price argument here, which makes it a rare clean A/B: run your own prompts through both and pick on output. The catalogue's own positioning says Sonnet 5.5 is for well-scoped everyday work and GPT-6.1 Sol for agentic coding and document-heavy professional work — that is a hint about the intended shape of the workload, not a benchmark.
Claude Sonnet 5.5 details GPT-6.1 Sol details Estimate monthly cost
Pricing and context data are based on a 2026-10-10 snapshot. Provider limits and pricing can change; verify on OpenRouter before production.