gpt-5.1-codex

Common Name: GPT-5.1 CodeX

Released on Nov 13, 2025 12:00 AMKnowledge Cutoff Sep 30, 2024 12:00 AMSupportedTool InvocationSupportedReasoning

GPT-5.1-Codex is a version of GPT-5 optimized for agentic coding tasks in Codex or similar environments. It's available in the Responses API only and the underlying model snapshot will be regularly updated. If you want to learn more about prompting GPT-5-Codex, refer to our dedicated guide

Specifications

Context

400K

Maximum Output

128K

Inputtext, image, audio

Outputtext, image, audio

Performance (7-day Average)

Collecting…

Availability Trend (24h)

Pricing

Standard

Flex

Batch

Input/MTokens

$1.375

$0.6875

Output/MTokens

$11.00

$5.50

Cached Input/MTokens

$0.1375

$0.06875

Performance Metrics (24h)

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