LLM Reference
OpenRouter

Using GPT-5.1 Codex Mini on OpenRouter

Implementation guide · GPT-5.1 · OpenAI

Serverless

OpenRouter exposes GPT-5.1 Codex Mini through model ID openai/gpt-5.1-codex-mini. 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-mini — see the documentation for request format.
  3. 3
    You'll be billed $0.25/1M input, $2.00/1M output tokens. See full pricing.
API PortalDocumentationPricingModel Card

Code Examples

See OpenRouter documentation for integration details.

Pricing on OpenRouter

TypePrice (per 1M)
Input tokens$0.25
Output tokens$2.00
Image input$1.00

Capabilities

VisionMultimodalReasoningJSON / Tool use

About GPT-5.1 Codex Mini

GPT-5.1 Codex Mini is a smaller, faster, and more cost-efficient agentic coding model in the GPT-5.1 Codex lineup. Delivers approximately 4x more usage within ChatGPT subscriptions compared to GPT-5.1 Codex Max at a slight capability tradeoff. Priced at $0.25 per 1M input tokens and $2 per 1M output tokens via API. Available in the Codex CLI and IDE extension, where it is offered automatically when users approach their usage limit.

Full model details →

Model Specs

Released2025-11-13
Context400k
ArchitectureDecoder Only
Knowledge cutoff2024-09

More Models on OpenRouter

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

Also available on(2)

Vercel AI Gateway$0.25/1MOpenAI API$0.25/1M
Compare all providers →

Provider

OpenRouter
OpenRouter

OpenRouter, Inc.

New York, NY, USA