gpt-5.1-codex

Display Name: GPT-5.1 CodeX

Released on Nov 13 12:00 AM

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

Context400,000

Maximum Output128,000

Inputtext, image

Outputtext, json

Performance (7-day Average)

Uptime

TPS

Pricing

Standard

Input$1.38/MTokens

Output$11.00/MTokens

Cached Input$0.14/MTokens

Flex

Input$0.69/MTokens

Output$5.50/MTokens

Cached Input$0.07/MTokens

Batch

Input$0.69/MTokens

Output$5.50/MTokens

Cached Input$0.07/MTokens

Availability Trend (24h)

Performance Metrics (24h)

Usage Statistics

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Documentation

No documentation available

This model (gpt-5.1-codex) uses a dedicated API. Please refer to the official documentation for usage examples.