LLM Reference
OpenRouter

Using GPT-5.1 Codex on OpenRouter

Implementation guide · GPT-5.1 · OpenAI

Serverless

OpenRouter exposes GPT-5.1 Codex through model ID openai/gpt-5.1-codex. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-06-15. Next refresh: weekly.

Quick Start

  1. 1
    Create an account at OpenRouter and generate an API key.
  2. 2
    Use the OpenRouter SDK or REST API to call openai/gpt-5.1-codex — see the documentation for request format.
  3. 3
    You'll be billed $1.25/1M input, $10.00/1M output tokens. See full pricing.
API PortalDocumentationPricingModel Card

Code Examples

See OpenRouter documentation for integration details.

Pricing on OpenRouter

TypePrice (per 1M)
Input tokens$1.25
Output tokens$10.00
Image input$1.00

Capabilities

VisionMultimodalJSON / Tool useStructured OutputsCode Execution

About GPT-5.1 Codex

GPT-5.1-Codex is a coding-specialized version of GPT-5.1, optimized for software engineering and agentic coding workflows at 400K context.

Full model details →

Model Specs

Released2025-12-01
Context400k
ArchitectureDecoder Only
Knowledge cutoff2024-09

More Models on OpenRouter

GPT-5.1GPT-5.1 ChatGPT-5.1 Codex MiniGPT-5.1 Codex Max
All models on OpenRouter →

Also available on(2)

Vercel AI Gateway$1.25/1MOpenAI API$1.25/1M
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Provider

OpenRouter
OpenRouter

OpenRouter, Inc.

New York, NY, USA