OpenAI
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Listed February 2026
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Code & Agent
GPT-5.3 Codex
Proprietary model from OpenAI, listed February 2026. $1.75 input / $14.00 output per 1M tokens. 400K tokens context.
Parameters
Not disclosed
Context Window
400K tokens
Input / 1M tokens
$1.75
Output / 1M tokens
$14.00
Benchmark Results
- AA Intelligence Index: 32.5 (Artificial Analysis v4.3 · best setting: GPT-5.3 Codex (Xhigh) · checked 2026-10-11)