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GPT-5.1 API
OpenRouter’s slug is openai/gpt-5.1. You pay the listed token rate from OpenRouter credits, not a ChatGPT subscription.
Updated 2026-09-27
On 27 Sep 2026 the models API listed openai/gpt-5.1 at $1.25 per million input tokens and $10 per million output tokens, cache reads at $0.125 per million, and a 400,000-token context. The card describes it as a GPT-5 generation model with adaptive reasoning. A batch slug, openai/gpt-5.1:batch, was half of that: $0.625 and $5.
There is also openai/gpt-5.1-codex at the same $1.25 / $10, and gpt-5.1-codex-mini at $0.25 / $2. A coding agent should name the codex slug if that is the one you evaluated. The plain gpt-5.1 slug is the general model.
The call uses the OpenRouter base URL and your OpenRouter key. You do not paste an OpenAI platform key unless you have set up bring-your-own-key on the account. A ChatGPT Plus login does not add GPT-5.1 credit here.
Questions
How much is the GPT-5.1 API on OpenRouter?
$1.25 per million input tokens and $10 per million output tokens on 27 Sep 2026. Batch is $0.625 and $5.
What is the model id?
openai/gpt-5.1
Does ChatGPT Plus include this?
No. This page is the metered API price on OpenRouter.
Related
- GPT-4o pricing
GPT-4o on OpenRouter was $2.50 input and $10 output per million tokens on 27 Sep 2026. The May 2024 snapshot was $5 / $15.
- Claude Sonnet 5 pricing
Claude Sonnet 5 was $2 input and $10 output per million tokens on 27 Sep 2026. Batch is $1 and $5. The slug is anthropic/claude-sonnet-5.
- AI model comparison
A price and context comparison of DeepSeek V4, Qwen3.7 Max, GLM 5.2, Claude Sonnet 5, GPT-5.1, and Grok 4.5 on OpenRouter, checked 27 Sep 2026.
- OpenRouter API URL
The OpenRouter base URL is https://openrouter.ai/api/v1. Chat calls go to /chat/completions with a Bearer key.