OpenAI

GPT-5.1-Codex

openai/gpt-5.1-codex

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Specification

Published by the vendor; the platform bills at the target's declared price.

GPT-5.1-Codex

reasoning tools

OpenAI openai/gpt-5.1-codex

GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....

Input $/1M: $1.25
Output $/1M: $10.0
Context: 400K
Max output: 128K
Released: Nov 13, 2025
Modalities: textimage

Cached input reads $0.13 per 1M

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targets.yamlyaml

# targets.yaml - declare a target that runs GPT-5.1-Codex
targets:
  - id: gpt-5-1-codex
    kind: llm
    name: GPT-5.1-Codex
    metadata:
      model: openai/gpt-5.1-codex          # links the target to this catalogue entry
    capabilities:
      domains: [general]
      supports_tools: true
      context_window: 400000
    cost:
      usd_per_1k_tokens: 0.005625

Price among OpenAI models

Input list price per million tokens; GPT-5.1-Codex is the 7th cheapest of 13 listed.

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