GPT-6.1 Sol vs Claude Sonnet 5.5
GPT-6.1 Sol is the lower-priced of the two on Router One at base-tier rates (GPT-6.1 Sol: request input ≤ 272,000 tokens) — about 67% less on a 1M-input + 1M-output mix. Both carry a 1.05M context window. GPT-6.1 Sol answers on /v1/chat/completions and /v1/responses (Codex CLI); Claude Sonnet 5.5 on /v1/chat/completions and /v1/messages (Claude Code).
GPT-6.1 Sol and Claude Sonnet 5.5 compared on current per-token rates, context window, and capabilities — both callable through one OpenAI-compatible endpoint with per-request cost traces.
GPT-6.1 Sol vs Claude Sonnet 5.5: rates, context window, and capabilities
| Spec | GPT-6.1 Sol | Claude Sonnet 5.5 |
|---|---|---|
| Input / 1M tokens | $0.40 | $1.20 |
| Output / 1M tokens | $2.00 | $6.00 |
| Cached input / 1M tokens | $0.02 | $0.12 |
| Context window | 1.05M | 1.05M |
| Capabilities | Chat, Streaming, Tool calling, Vision | Chat, Streaming, Tool calling, Vision |
| Subscription plans | Not in any plan — wallet | Not in any plan — wallet |
| Detail page | GPT-6.1 Sol | Claude Sonnet 5.5 |
GPT-6.1 Sol: request input ≤ 272,000 tokens: Input $0.40 / 1M tokens, Output $2.00 / 1M tokens, Cache write $0.50 / 1M tokens, Cached input $0.02 / 1M tokens; request input > 272,000 tokens: Input $0.80 / 1M tokens, Output $3.00 / 1M tokens, Cache write $1.00 / 1M tokens, Cached input $0.04 / 1M tokens. The total input tokens in each request select the tier; its rates apply to the whole request, not only tokens above the threshold.
What does 1M tokens cost on GPT-6.1 Sol vs Claude Sonnet 5.5?
Base-tier rates: For a workload of 1M input plus 1M output tokens at current rates: GPT-6.1 Sol comes to $2.40, Claude Sonnet 5.5 comes to $7.20 — GPT-6.1 Sol is about 67% cheaper on this mix. Real workloads skew heavily toward input tokens, so weigh the input rate by your own ratio; the cached-input row above is the posted catalog rate for that model.
Switch between GPT-6.1 Sol and Claude Sonnet 5.5
The API key and base URL stay the same, but this is not a one-string switch for every request. Per OpenAI's GPT-6 guide (checked 2026-10-01), GPT-6.1 Sol supports Chat Completions only for requests without tools, takes tool calls on the Responses API and takes no temperature, top_p or logprobs settings. Router One serves Claude Sonnet 5.5 on /v1/messages and /v1/chat/completions, not on /v1/responses. So code that sends tools has to change path as well as model: Codex CLI (/v1/responses) runs only the GPT side and Claude Code (/v1/messages) only the Claude side. As of the 2026-10-01 plan response, both models are in no plan tier and bill the wallet per token.
curl https://api.router.one/v1/chat/completions \
-H "Authorization: Bearer sk-your-router-one-key" \
-H "Content-Type: application/json" \
-d '{"model": "openai/gpt-6.1-sol", "messages": [{"role": "user", "content": "Hello"}]}'
# Same request, other model — change one string:
# "model": "anthropic/claude-sonnet-5.5"FAQ
Is GPT-6.1 Sol cheaper than Claude Sonnet 5.5?
Compared at base-tier rates (GPT-6.1 Sol: request input ≤ 272,000 tokens). Input: GPT-6.1 Sol $0.40 vs Claude Sonnet 5.5 $1.20 / 1M tokens; GPT-6.1 Sol has the lower rate. Output: GPT-6.1 Sol $2.00 vs Claude Sonnet 5.5 $6.00 / 1M tokens; GPT-6.1 Sol has the lower rate. Total cost depends on the workload's input, output and cache usage. GPT-6.1 Sol: request input ≤ 272,000 tokens: Input $0.40 / 1M tokens, Output $2.00 / 1M tokens, Cache write $0.50 / 1M tokens, Cached input $0.02 / 1M tokens; request input > 272,000 tokens: Input $0.80 / 1M tokens, Output $3.00 / 1M tokens, Cache write $1.00 / 1M tokens, Cached input $0.04 / 1M tokens. The total input tokens in each request select the tier; its rates apply to the whole request, not only tokens above the threshold. Rates change; the /models page is the live source of truth.
Is GPT-6.1 Sol or Claude Sonnet 5.5 included in a Router One subscription?
Neither GPT-6.1 Sol nor Claude Sonnet 5.5 is in a Router One plan, so every call to either bills the wallet per token.
Can I switch between GPT-6.1 Sol and Claude Sonnet 5.5 without changing code?
The API key and base URL stay the same, but this is not a one-string switch for every request. Per OpenAI's GPT-6 guide (checked 2026-10-01), GPT-6.1 Sol supports Chat Completions only for requests without tools, takes tool calls on the Responses API and takes no temperature, top_p or logprobs settings. Router One serves Claude Sonnet 5.5 on /v1/messages and /v1/chat/completions, not on /v1/responses. So code that sends tools has to change path as well as model: Codex CLI (/v1/responses) runs only the GPT side and Claude Code (/v1/messages) only the Claude side. As of the 2026-10-01 plan response, both models are in no plan tier and bill the wallet per token.
Where do these numbers come from?
Specs and prices on this page render from the live Router One catalog — the same data as the /models page — and refresh with it. Pricing methodology is documented on /pricing-methodology. Rates on this page were read from the live catalog on 2026-10-01 (UTC) and refresh within the hour.