# OpenAI: GPT-5.1-Codex-Max

Provider: openai  
Category: llm  
Model ID: `openai/gpt-5.1-codex-max`

GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...

## Specs

- Context length: 400000 tokens
- Max output: 128000 tokens
- Modalities: text, image
- Released: 2025-12-04

## Pricing

- Input: $1.25 per million tokens
- Output: $10.00 per million tokens

## Providers

- **openai** — ctx 400000, input $1.25/M, output $10.00/M

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Last verified: 2026-04-23T23:46:29.618Z  
Canonical URL: https://switchy.build/models/gpt-5-1-codex-max