Claude Opus 5.5 vs GPT-6 Sol
GPT-6 Sol is the lower-priced of the two on Router One at base-tier rates (GPT-6 Sol: request input ≤ 272,000 tokens) — about 83% less on a 1M-input + 1M-output mix. Both carry a 1.05M context window. Claude Opus 5.5 answers on /v1/chat/completions and /v1/messages (Claude Code); GPT-6 Sol on /v1/chat/completions and /v1/responses (Codex CLI). Claude Opus 5.5 is in no plan and bills the wallet; GPT-6 Sol counts against the Premium models allowance on Pro, Max and Ultra.
Claude Opus 5.5 and GPT-6 Sol compared on current per-token rates, context window, and capabilities — both callable through one OpenAI-compatible endpoint that logs each request it forwards.
Claude Opus 5.5 vs GPT-6 Sol: rates, context window, and capabilities
| Spec | Claude Opus 5.5 | GPT-6 Sol |
|---|---|---|
| Input / 1M tokens | $2.40 | $0.40 |
| Output / 1M tokens | $12.00 | $2.00 |
| Cached input / 1M tokens | $0.40 | $0.04 |
| Context window | 1.05M | 1.05M |
| Capabilities | Chat, Streaming, Tool calling, Vision | Chat, Streaming, Tool calling, Vision |
| Subscription plans | Not in any plan — wallet | Premium models — Pro, Max, Ultra |
| Detail page | Claude Opus 5.5 | GPT-6 Sol |
GPT-6 Sol: request input ≤ 272,000 tokens: Input $0.40 / 1M tokens, Output $2.00 / 1M tokens, Cache write $0.50 / 1M tokens, Cached input $0.04 / 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 $0.08 / 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 Claude Opus 5.5 vs GPT-6 Sol?
Base-tier rates: For a workload of 1M input plus 1M output tokens at current rates: Claude Opus 5.5 comes to $14.40, GPT-6 Sol comes to $2.40 — GPT-6 Sol is about 83% 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 Claude Opus 5.5 and GPT-6 Sol
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 Sol model page and GPT-6 guide (checked 2026-10-01), GPT-6 Sol supports function calling on Chat Completions only with reasoning_effort set to none (the default is medium), OpenAI points to the Responses API for tools, and at any effort other than none GPT-6 Sol takes no temperature, top_p or logprobs settings. Router One serves Claude Opus 5.5 on /v1/messages and /v1/chat/completions, not on /v1/responses. So tool-using code needs more than a new model string, and Claude Code (/v1/messages) runs only the Claude side while Codex CLI (/v1/responses) runs only the GPT side. On a Pro, Max or Ultra plan the billing differs too: as of the 2026-10-06 plan response, GPT-6 Sol counts against the Premium models allowance, while Claude Opus 5.5, in no plan tier, bills 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": "anthropic/claude-opus-5.5", "messages": [{"role": "user", "content": "Hello"}]}'
# Same request, other model — change one string:
# "model": "openai/gpt-6-sol"FAQ
Is Claude Opus 5.5 cheaper than GPT-6 Sol?
Compared at base-tier rates (GPT-6 Sol: request input ≤ 272,000 tokens). Input: Claude Opus 5.5 $2.40 vs GPT-6 Sol $0.40 / 1M tokens; GPT-6 Sol has the lower rate. Output: Claude Opus 5.5 $12.00 vs GPT-6 Sol $2.00 / 1M tokens; GPT-6 Sol has the lower rate. Total cost depends on the workload's input, output and cache usage. GPT-6 Sol: request input ≤ 272,000 tokens: Input $0.40 / 1M tokens, Output $2.00 / 1M tokens, Cache write $0.50 / 1M tokens, Cached input $0.04 / 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 $0.08 / 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 Claude Opus 5.5 or GPT-6 Sol included in a Router One subscription?
Claude Opus 5.5 is in no Router One plan, so every call bills the wallet per token. GPT-6 Sol counts against the Premium models allowance on Pro, Max and Ultra: Pro 300, Max 1,000 and Ultra 5,000 requests per 30-day cycle, shared by every model in that tier. GPT-6 Sol requests above its long-context threshold count as more than one quota request. Requests beyond a plan's allowance bill the wallet per token.
Can I switch between Claude Opus 5.5 and GPT-6 Sol 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 Sol model page and GPT-6 guide (checked 2026-10-01), GPT-6 Sol supports function calling on Chat Completions only with reasoning_effort set to none (the default is medium), OpenAI points to the Responses API for tools, and at any effort other than none GPT-6 Sol takes no temperature, top_p or logprobs settings. Router One serves Claude Opus 5.5 on /v1/messages and /v1/chat/completions, not on /v1/responses. So tool-using code needs more than a new model string, and Claude Code (/v1/messages) runs only the Claude side while Codex CLI (/v1/responses) runs only the GPT side. On a Pro, Max or Ultra plan the billing differs too: as of the 2026-10-06 plan response, GPT-6 Sol counts against the Premium models allowance, while Claude Opus 5.5, in no plan tier, bills 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 2026-11-11 (UTC) and refresh within the hour.