AI Index

GPT-5.1-codex

Language OpenAI Partly verified Retired Shut down Jul 23, 2026 Released Nov 13, 2025
Model ID
Context
400K
128K max output
Input price
$1.25
per 1M tokens · OpenAI API
Output price
$10.00
per 1M tokens
Epoch Capabilities Index
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Not listed
LMArena Text
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Not listed

Where to run it

2 offerings · prices as listed
MeterTierPrice
OpenAI API (opens in a new tab) Official Retired Global · USD gpt-5.1-codex
InputStandard $1.25 / 1M tokens
OutputStandard $10.00 / 1M tokens
Cache readStandard $0.13 / 1M tokens
Azure OpenAI in Foundry (opens in a new tab) Shuts down May 15, 2027 Global · USD gpt-5.1-codex
InputStandard $1.25 / 1M tokens
OutputStandard $10.00 / 1M tokens
Cache readStandard $0.13 / 1M tokens

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