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OpenAI model

GPT-5.1-Codex

API pricing per million tokens

gpt-5-1-codex ReasoningChecked 7h ago
Cost calculator Compare
Input
$1.25
per 1M, list
Output
$10
per 1M tokens
Cached input
$0.13
no batch tier listed
Context
400K
128K max output

Where to buy it (2)

  • Azure AI Foundrydefault region$1.25 / $10cached $0.13
  • OpenAI (list)the lab's own API$1.25 / $10cached $0.13

Through a gateway

Your own numbers

100M input and 20M output tokens a month: $325.00 direct.

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About GPT-5.1-Codex

GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows.

Takes text, image in and returns text. First listed Nov 14, 2025. Blended price $3.44 per 1M tokens at 3 input to 1 output.

OpenRouter listing OpenAI pricing page
Across fru.devCompany profile4 acquisitionsPay schedule64 releases, latest 2026-09-229 conferences

Questions

How much does GPT-5.1-Codex cost?

$1.25 per million input tokens and $10 per million output tokens, with cached input at $0.13.

What is the context window of GPT-5.1-Codex?

400K tokens, with up to 128K tokens of output.

Where is GPT-5.1-Codex cheapest?

Of 2 routes tracked, Azure AI Foundry is cheapest at $1.25 input and $10 output per million tokens.

List prices from providers' pages on the date shown; your contract may differ. Logos via logo.dev; trademarks belong to their owners.

Weekly: LLM API list prices that changed, Thursday mornings.