OpenAI
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Listed November 2025
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Code & Agent
GPT-5.1 Codex
Proprietary model from OpenAI, listed November 2025. $1.25 input / $10.00 output per 1M tokens. 400K tokens context.
Parameters
Not disclosed
Context Window
400K tokens
Input / 1M tokens
$1.25
Output / 1M tokens
$10.00
Benchmark Results
- SWE-bench Verified: 66.0% (mini-SWE-agent (bash only) · run 'GPT 5.1 Codex (medium)' · 2025-11-24)
- AA Intelligence Index: 23.7 (Artificial Analysis v4.3 · best setting: GPT-5.1 Codex (High) · checked 2026-10-11)