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GPT-5.4 stopped working in version 0.47.0 #817

@future-media

Description

@future-media

Can't connect to GPT-5.4
Other versions such as GPT-5.3-codex are accessible, but trying to use GPT-5.4 returns an error.

Versions

  • Copilot for Xcode: 0.47.0
  • Xcode: 16.2
  • macOS: 15.7.3

Steps to reproduce

  1. Select Agent and GPT-5.4.
  2. Type any text.

Screenshots
https://drive.google.com/file/d/1e59D01DNeaJZ_FeZ3V-Z_z3tBHuxaHPr/view?usp=sharing

Additional context
It was working in the previous version. max_tokens parameter is not accepted by GPT-5.4, but Copilot is trying to use it.

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