OpenAI: GPT-5.1 Chat API Pricing
Live token cost for OpenAI: GPT-5.1 Chat from OpenAI. Use the figures below for budgeting, then tune your exact request mix in the interactive calculator. Prices refresh every 24 hours from OpenRouter.
Capabilities
OpenAI: GPT-5.1 Chat cost at scale
Estimated monthly cost across common production volumes. Assumes 30-day months and the request shapes shown.
| Tier | Requests / day | In / out tokens | $ / month |
|---|---|---|---|
| Hobby | 1,000 | 500 / 200 | $78.75 |
| Startup | 10,000 | 1,500 / 500 | $2,062.50 |
| Growth | 100,000 | 3,000 / 800 | $35,250.00 |
| Enterprise | 1,000,000 | 8,000 / 2,000 | $900,000.00 |
| Enterprise (batch mode) | 1,000,000 | 8,000 / 2,000 | $450,000.00 |
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Frequently asked questions
How much does OpenAI: GPT-5.1 Chat cost?
OpenAI: GPT-5.1 Chat costs $1.25 per 1M input tokens and $10.00 per 1M output tokens, with cached input at $0.13 per 1M tokens. A typical 1,500-token in / 500-token out request costs $0.00688.
Does OpenAI: GPT-5.1 Chat support cached input?
Yes. OpenAI: GPT-5.1 Chat supports prompt caching at $0.13 per 1M cached input tokens. Reuse the same system prompt or context across requests to cut input cost dramatically.
What is the OpenAI: GPT-5.1 Chat context window?
OpenAI: GPT-5.1 Chat supports a context window of 128,000 tokens (128K). Max output per response is 16,384 tokens.
What is OpenAI: GPT-5.1 Chat good for?
OpenAI: GPT-5.1 Chat is a good fit for frontier reasoning, agentic tool use, code generation, multimodal analysis. For other use cases, run your specific input/output mix through the interactive calculator to compare against alternative models.