OpenAI o3-mini (Low)
OpenAI o3-mini (Low) is a reasoning model from OpenAI released on Jan 31, 2026. It reads text and writes text, with a 200K token context window and up to 100K tokens per reply.
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It costs $1.10 per million input tokens and $4.40 per million output tokens. Cached input bills at $0.55, 50% less than fresh input.
It supports tool calling, structured JSON output and prompt caching.
- Modalities
- In / out price
- $1.10 / $4.40 per 1M
- Context
- 200K
- Max output
- 100K
- Released
- Jan 31, 2026
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
OpenAI o3-mini (Low) pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $1.10 / 1M tokens | |
|---|---|---|
| Output | $4.40 / 1M tokens | |
| Cached input (read) | $0.55 / 1M tokens | 50% off input |
What OpenAI o3-mini (Low) costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call OpenAI o3-mini (Low) through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Reasoning
reasoning
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OpenAI o3-mini (Low) questions
How much does the OpenAI o3-mini (Low) API cost?
$1.10 per million input tokens and $4.40 per million output tokens, with cached input at $0.55. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of OpenAI o3-mini (Low)?
200,000 tokens of input, and it can write up to 100,000 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Does OpenAI o3-mini (Low) support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is OpenAI o3-mini (Low) open source?
No. OpenAI serves it through an API only, so you cannot download the weights or host it yourself.
When was OpenAI o3-mini (Low) released?
Jan 31, 2026.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.
Building on OpenAI o3-mini (Low)?
I test your real tasks on it and the two closest alternatives, then ship the agent on whichever wins on cost and accuracy.
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