o4 mini API

Input / 1M tokens$0.968~~$1.10~~

Output / 1M tokens$3.87~~$4.40~~

LLMOpenAI12% below official128K contextReasoningPrompt caching

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About o4 mini

o4 mini by OpenAI is available on API Many from $0.968 per million input tokens and $3.87 per million output tokens, and you call it with the same API key you use for every other model.

It accepts OpenAI-style chat requests with streaming and tools, has a 128K context window and can return up to 16,000 tokens per response.

Prompt caching is supported: cached input tokens are billed at the lower cached rate shown in the price table.

You pay only for successful results: failed or rejected requests are refunded automatically, and every call is recorded in your console with its exact cost.

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Frequently asked questions

How much does the o4 mini API cost?

o4 mini starts at $0.968 per million input tokens and $3.87 per million output tokens on API Many. The price table on this page lists every tier; you are charged only for successful requests.

How do I call o4 mini?

Create an API key in the console, then send a request to /v1/chat/completions with "model": "o4-mini". The API tab has copy-ready examples in cURL, Python and Node.js.

Is this the official o4 mini model?

Yes. Requests are forwarded to the model maker or an authorized channel with the same parameters, so the output matches the official API.

What happens if a request fails?

Failed, rejected or timed-out requests are not charged. Reserved balance is released automatically and the reason is shown in the call record.