GPT-5.2 Codex
Notable release: A meaningful new model: a new size or version, or a strong free-to-download model from a known lab.
Key facts
- Released
- Dec 18, 2025
- What it does
- Text and chat: Writes, answers questions and holds a conversation.Thinks first: Can reason step by step before it answers: slower, but better at maths, code and tricky questions.Sees images: Understands pictures, screenshots and charts you share with it.
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- How
- For developers, through an API
- Announced as
- “Introducing GPT-5.2 Codex”
From trckr's archive of releases before it started watching. Date and details from Epoch AI's database of AI models (CC BY 4.0).
Price and limits
What developers pay to use it through the API: How developers plug a model into their own apps and pay per use. A model that's "in the API" can be used by programmers, even if it isn't in a chat app yet., per million Tokens: The small chunks of text a model reads and writes, about three-quarters of a word each. Prices and limits are counted in tokens. sent (input) or written back (output), and how much it can take in at once.
- Input
- $1.75
- per million tokensCached: $0.175
- Output
- $14.00
- per million tokens
- Context window: How much a model can keep in mind at once: your question, any files you share and its own replies. Measured in tokens; 1,000 tokens is about 750 words.
- 400K tokens
- about 300,000 words
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- Longest answer
- 128K tokens (about 96,000 words)
From OpenRouter, checked .
Compare GPT-5.2 Codex with
It came out 7 days after GPT-5.2 Pro, the lab's previous model.
The details
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