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OpenAI: GPT-5.1-Codex

by OpenAI

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. The model supports building projects from scratch, feature development, debugging, large-scale refactoring, and code review. Compared to GPT-5.1, Codex is more steerable, adheres closely to developer instructions, and produces cleaner, higher-quality code outputs. Reasoning effort can be adjusted with the `reasoning.effort` parameter. Read the [docs here](https://openrouter.ai/docs/use-cases/reasoning-tokens#reasoning-effort-level) Codex integrates into developer environments including the CLI, IDE extensions, GitHub, and cloud tasks. It adapts reasoning effort dynamically—providing fast responses for small tasks while sustaining extended multi-hour runs for large projects. The model is trained to perform structured code reviews, catching critical flaws by reasoning over dependencies and validating behavior against tests. It also supports multimodal inputs such as images or screenshots for UI development and integrates tool use for search, dependency installation, and environment setup. Codex is intended specifically for agentic coding applications.

Avg Score

0.0%

0 answers

Avg Latency

0ms

0 runs

Pricing

$1.25

input

/

$10.00

output

per 1M tokens

Context

400K

tokens

Alternatives

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Other Models from OpenAI

Compare performance with other models from the same creator

ModelScoreLatencyCost/1M
OpenAI: GPT-5.287.1%4.8s$7.88
OpenAI: GPT-5.2 Pro85.5%18.2s$94.50
OpenAI: GPT-5.2 Chat84.9%4.2s$7.88
OpenAI: GPT-5 Mini80.0%8.6s$1.13
OpenAI: GPT-5 Nano78.8%12.8s$0.22
OpenAI: gpt-oss-20b73.3%6.2s$0.06
OpenAI: gpt-oss-120b47.8%11.1s$0.11
OpenAI: GPT-5.1-Codex-Max——$5.63
OpenAI: GPT-5.1——$5.63
OpenAI: GPT-5.1 Chat——$5.63
OpenAI: GPT-5.1-Codex-Mini——$1.13
OpenAI: gpt-oss-safeguard-20b——$0.19
OpenAI: GPT-5 Image Mini——$2.25
OpenAI: GPT-5 Image——$10.00
OpenAI: o3 Deep Research——$25.00
OpenAI: o4 Mini Deep Research——$5.00
OpenAI: GPT-5 Pro——$67.50
OpenAI: GPT-5 Codex——$5.63
OpenAI: GPT-4o Audio——$6.25
OpenAI: GPT-5 Chat——$5.63
OpenAI: GPT-5——$5.63
OpenAI: gpt-oss-120b——$0.0000
OpenAI: gpt-oss-120b——$0.11
OpenAI: gpt-oss-20b——$0.0000
OpenAI: o3 Pro——$50.00
OpenAI: Codex Mini——$3.75
OpenAI: o4 Mini High——$2.75
OpenAI: o3——$5.00
OpenAI: o4 Mini——$2.75
OpenAI: GPT-4.1——$5.00
OpenAI: GPT-4.1 Mini——$1.00
OpenAI: GPT-4.1 Nano——$0.25
OpenAI: o1-pro——$375.00
OpenAI: GPT-4o-mini Search Preview——$0.38
OpenAI: GPT-4o Search Preview——$6.25
OpenAI: o3 Mini High——$2.75
OpenAI: o3 Mini——$2.75
OpenAI: o1——$37.50
OpenAI: GPT-4o (2024-11-20)——$6.25
OpenAI: ChatGPT-4o——$10.00
OpenAI: GPT-4o (2024-08-06)——$6.25
OpenAI: GPT-4o-mini (2024-07-18)——$0.38
OpenAI: GPT-4o-mini——$0.38
OpenAI: GPT-4o (2024-05-13)——$10.00
OpenAI: GPT-4o——$6.25
OpenAI: GPT-4o——$12.00
OpenAI: GPT-4 Turbo——$20.00
OpenAI: GPT-3.5 Turbo (older v0613)——$1.50
OpenAI: GPT-4 Turbo Preview——$20.00
OpenAI: GPT-4 Turbo (older v1106)——$20.00
OpenAI: GPT-3.5 Turbo Instruct——$1.75
OpenAI: GPT-3.5 Turbo 16k——$3.50
OpenAI: GPT-4 (older v0314)——$45.00
OpenAI: GPT-4——$45.00
OpenAI: GPT-3.5 Turbo——$1.00

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Quickstart

Get started with this model using OpenRouter

View on OpenRouter
import { OpenRouter } from "@openrouter/sdk";

const openrouter = new OpenRouter({
  apiKey: "<OPENROUTER_API_KEY>"
});

const completion = await openrouter.chat.completions.create({
  model: "openai/gpt-5.1-codex",
  messages: [
    {
      role: "user",
      content: "Hello!"
    }
  ]
});

console.log(completion.choices[0].message.content);

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