token.app › OpenAI › GPT-5.1-Codex

GPT-5.1-Codex pricing & benchmarks

GPT-5.1-Codex 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 is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....

Pricing

Per million tokens · OpenRouter

Input$1.25

Output$10.00

Blended (3:1)$3.44

Specification

openai/gpt-5.1-codex

Context window400K

Max output128K

ReleasedNov 2025

LicenceProprietary

Modalitiesin:text, in:image, out:text

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

Compare GPT-5.1-Codex

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

FAQ

How much does GPT-5.1-Codex cost?

GPT-5.1-Codex 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's context window?

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