GPT 5.1 Codex Mini

ChatInput: ImageInput: TextReleased Nov 13, 2025

Built by OpenAI · United States · openai.com

GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex

How to use

model: "openai/gpt-5.1-codex-mini"

Cap quality here and save

Hard questions go to this model, easy ones drop to something cheaper. Set a savings target (0–0.8) and the router tunes itself until realized savings converge on it.

{
  "model": "celon/auto",
  "celon": {
    "anchor": "openai/gpt-5.1-codex-mini",
    "savings_target": 0.4
  }
}

Naming a model directly gets you that model — savings controls don't apply.

Context

272K

Max output

100K

Input $/1M

$0.25

Output $/1M

$2.00

Features

Image inputTool callingJSON

Serving providers

OpenAI

Providers

Price, latency, and uptime per provider serving this model. Celon routes each request to the fastest and cheapest of them. Click a row for regions and data policies.

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Performance

Benchmark quality scores, and measured speed per provider.

Quality

Terminal-BenchAgentic terminal tasks

61.6%

At each model's best reasoning effort. Benchmarks it wasn't run on are omitted.

Speed

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