GPT-5.2 CodexRetired
OpenAI retired this model on 23 July 2026. It no longer answers, so you can't pick it for new chats. Its details stay here for reference.
Our most intelligent coding model optimized for long-horizon, agentic coding tasks
Private by design
When you use GPT-5.2 Codex in Polymeti, your browser sends the message to OpenAI directly, with your own API key. Nothing passes through a Polymeti server.
- We never see your conversation.
- Your API key is stored in your browser, not on our servers.
- Your chat history lives on your device. Back it up to your own Google Drive if you want it on more than one.
What it can do
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Context window
400,000 tokens
≈ 300,000 words · about 1,200 pages
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Max output
128,000 tokens
≈ 96,000 words in a single answer
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Knowledge cutoff
August 2025
its training cutoff
- Reads images you attach
- Uses tools
Modalities
- Text Input and output
- Image Input only
- Audio Not supported
- Video Not supported
Reasoning effort
Features
- Streaming Supported
- Function calling Supported
- Structured outputs Supported
- Fine-tuning Not supported
Ready to try it?
Polymeti is currently invite-only.
Sign inBring your own API key · Your chats stay in your browser