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)
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Pricing
Standard
Flex
Batch
Input/MTokens
$1.38
$0.69
$0.69
Output/MTokens
$11.00
$5.50
$5.50
Cached Input/MTokens
$0.14
$0.07
$0.07
Availability Trend (24h)
Performance Metrics (24h)
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