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GPT-5.1-Codex-Max pricing & benchmarks

GPT-5.1-Codex-Max is available from OpenAI at $1.25 per million input tokens and $10.00 per million output tokens ($3.44 blended at 3:1). It accepts up to 400,000 tokens of context. 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...

Pricing

Per million tokens · OpenRouter

Input$1.25

Output$10.00

Blended (3:1)$3.44

Specification

openai/gpt-5.1-codex-max

Context window400K

Max output128K

ReleasedDec 2025

LicenceProprietary

Modalitiesin:text, in:image, out:text

No independently-run benchmark scores are published for GPT-5.1-Codex-Max yet. We show nothing rather than reprinting an unverified figure.

Compare GPT-5.1-Codex-Max

GPT-5.1-Codex-Max vs Qwen3.8 Max GPT-5.1-Codex-Max vs DeepSeek V4 Flash 0731 GPT-5.1-Codex-Max vs Claude Opus 5 GPT-5.1-Codex-Max vs Gemini 3.6 Flash GPT-5.1-Codex-Max vs Kimi K3 GPT-5.1-Codex-Max vs Grok 4.5 GPT-5.1-Codex-Max vs Claude Sonnet 5 GPT-5.1-Codex-Max vs GLM 5.2

FAQ

How much does GPT-5.1-Codex-Max cost?

GPT-5.1-Codex-Max costs $1.25 per million input tokens and $10.00 per million output tokens on OpenRouter. At a 3:1 input:output mix that blends to $3.44 per million tokens.

What is GPT-5.1-Codex-Max's context window?

GPT-5.1-Codex-Max accepts up to 400,000 tokens of context, and can generate up to 128,000 output tokens.