Model detail
gpt-5.1-codex-mini
GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex
Model specs
- Context length
- 400K
- Max output
- 128K
- I/O modalities
- Text / Image
- Released
- 2025-11
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API endpoints
One MixRoute gateway, OpenAI-compatible
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OpenAI-compatible
/v1/chat/completionsPOST
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Pricing
Flat rate, unit: /1M Tokens
Input
$1.2500 /1M Tokens
Completion
$10.0000 /1M Tokens
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Selection summary
Quickly judge whether it fits your workload
What is this model good for?
Smaller and faster coding tasks
Use gpt-5.1-codex-mini when a lighter, faster option is sufficient for scoped development work derived from a Codex workflow.
What should you check before using it?
Confirm quality on the smaller task profile
Compare code correctness, latency, and completion quality with a larger coding model on the routine tasks you intend to route here.
How should you start?
Route bounded development work to gpt-5.1-codex-mini
Use model ID gpt-5.1-codex-mini for a controlled pilot, with tests and review retained for every proposed code change.
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Token cost estimator
Live estimate from this page's pricing, not an actual bill
This model has no cache-read price; caching is not counted
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FAQ
gpt-5.1-codex-mini is a smaller and faster option for scoped coding work where a lighter Codex-oriented model is sufficient.
One endpoint, a testable decision
Test this model and alternate routes with the same request format
Start from a real workload, then let quality, total cost, and failure conditions decide whether to send production traffic.