Source-linked AI model

OpenAI: GPT-5.1-Codex-Max

OpenAI: GPT-5.1-Codex-Max is an AI model from openai with a 400,000-token context window, priced at $1.25 per 1M tokens for input. Review its sourced specs below; unavailable fields remain unavailable.

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...

Provider

openai

Context window

400,000 tokens

Input price

$1.25 per 1M tokens

Output price

$10 per 1M tokens

Source

OpenRouter

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