Smaller, cheaper GPT-5.1-Codex for coding tasks.
Released
Nov 13, 2025
Context window
400K tokens
Max output
128K tokens
Parameters
Not disclosed
Input price
Not disclosed
Output price
Not disclosed
Prices are first-party list prices in USD at the standard tier. Last verified Oct 30, 2026.
Pricing
Launch priceNov 13, 2025
$0.25 in / $2.00 out
Current price
No longer sold