Bug Report: Cannot change model inside a Project in MacOS ChatGPT app
`Steps to Reproduce`
Path A: Inside a Project (full app)
1. Open the ChatGPT Mac app.
2. Open any Project.
3. Open a conversation within that Project.
4. Try to change the model:
• There is no model picker under the input box.
• Clicking the conversation title at the top does show model options.
5. Select a different model (e.g., switch from GPT-5 to GPT-4o).
Path B: Inside a Project (Companion)
1. Open Companion.
2. Navigate to the same Project conversation.
3. Attempt to change the model:
`Expected Result`
While inside a Project conversation, I can select a different model (GPT-5, GPT-4o, etc.) and the current Project conversation switches models in place, preserving the Project context and thread
`Actual Result`
• Full app: Selecting a model from the title menu kicks me out into a new conversation outside the Project, losing Project context.
• Companion: There is no way to change the model at all; no picker under the input, and title click doesn’t surface it.
`Environment`
macOS: Sequoia 15.6 - App version: 1.2025.224 (1755308485)
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