model change not functional

[ezechiel203]

Describe the bug

Changing model seems to be non functional (I tried to use haiku 4.5, shown Haiku over the prompt bar, but GPT5 shown when calling /usage)

 ✗ Execution failed: missing finish_reason for choice 0

 ● Total usage est:       7 Premium requests
   Total duration (API):  1m 23.2s
   Total duration (wall): 9m 5.5s
   Total code changes:    102 lines added, 0 lines removed
   Usage by model:
       gpt-5                157.5k input, 4.2k output, 0 cache read, 0 cache write (Est. 7 Premium requests)              



                                                                                            claude-haiku-4.5 (0.33x)                                                                       

Affected version

0.0.354 Commit: 076bd172b

Steps to reproduce the behavior

1. type /model and select Claude Haiku 4.5
2. prompt requests
3. call /usage and see which model was used (GPT)

Expected behavior

copilot-cli should show Haiku usage when calling /usage

Additional context

macOS Tahoe, Mac Pro M1.