[BUG] azure gpt-5.3-codex not working
Author: Raffa50Created Mar 18, 2026Updated May 13, 2026
Labelsbug
Problem (one or two sentences)
Hello I'm trying to configure gpt-5.3-codex hosted on my azure subscription
Provider: openai compatible Url: https://.openai.azure.com/openai/deployments/gpt5.3 model: gpt-5.3-codex use Azure: true enable R1 parameters: false (also tryed true)
I get the error:
OpenAI completion error: 400 The chatCompletion operation does not work with the specified model, gpt-5.3-codex. Please choose different model and try again. You can learn more about which models can be used with each operation here: https://go.microsoft.com/fwlink/?linkid=2197993.
Context (who is affected and when)
When you use an azure gpt-5.x codex model
Reproduction steps
- Configure an azure gpt-5.x model
- Ask anything in the chat
Expected result
Roo code works
Actual result
Error 400
Variations tried (optional)
No response
App Version
3.52.1
API Provider (optional)
OpenAI Compatible
Model Used (optional)
gpt-5.3-codex
Roo Code Task Links (optional)
No response
Relevant logs or errors (optional)
Source: RooCodeInc/Roo-Code