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GPT-5.1-Codex-Max

gpt-5.1-codex-max
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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... Built by OpenAI.

Prices updated

Input price

$1.25

per 1M tokens · Standard

Output price

$10

per 1M tokens · Standard

Input limit

400K

tokens

Output limit

128K

tokens

Input formats

TextImageVideoAudioPDF

Output formats

TextImageVideoAudioPDF
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GPT-5.1-Codex-Max price history

2 price records since 9/25/2026

GPT-5.1-Codex-Max cost calculator

Input20M tokens
Output5M tokens

$75/month

Standard pricing

    Overview

    What is GPT-5.1-Codex-Max?

    GPT-5.1-Codex-Max is a text & reasoning and vision and code & slms model from OpenAI. 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... Its 400K context window and $1.25 input price make it a candidate for quality-focused production applications.

    Code generationAgent workflowsImage understandingDocument analysis

    Rates

    GPT-5.1-Codex-Max pricing

    Pricing is based on token usage. Provider-specific caching, batch, regional, and tool charges may affect the final cost.

    Input · Standard

    $1.25

    Per 1M tokens

    Cached input · Standard

    $0.13

    Per 1M tokens

    Capabilities

    GPT-5.1-Codex-Max Tools

    Tools available when using GPT-5.1-Codex-Max through supported provider APIs.

    Function calling

    Supported

    Structured outputs

    Supported

    JSON mode

    Supported

    Reasoning

    Supported

    Built-in web search

    Not supported

    Log probabilities

    Not supported

    Deterministic seed

    Supported

    Parallel tool calls

    Not supported

    Prompt caching

    Supported

    Strengths and limitations

    Strengths

    • Priced at $1.25 input and $10 output per million tokens.
    • 400K context supports large documents, repositories and extended conversations.
    • Supports text & reasoning and vision and code & slms workloads in one model.

    Limitations

    • Generated tokens cost 8× more than input tokens, which matters for verbose responses.
    • Large context capacity does not guarantee consistent retrieval across the entire prompt.
    • Arena Elo and MMLU-Pro are directional; test accuracy, latency and reliability on your own workload before committing.

    Arena Elo, MMLU-Pro and pricing figures are illustrative; validate current vendor terms before purchase.

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    Frequently asked questions about GPT-5.1-Codex-Max

    GPT-5.1-Codex-Max is a text & reasoning and vision and code & slms model from OpenAI. 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...