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GPT-5.3-Codex

400KContext
$1.75In, per 1M
$14Out, per 1M
Lab
OpenAI
Released
24 Feb 2026
Context window
400K tokens
Longest answer
128K tokens
Input, per 1M tokens
$1.75
Output, per 1M tokens
$14
Reads images
Yes
Reasoning
Yes
Tool calling
Yes
Open weights
No
Answers in
text
Model id
openai/gpt-5.3-codex