#11951·Roo-Code

[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

  1. Configure an azure gpt-5.x model
  2. 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)

bash