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## I have read the [CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md) file. YES ## What kind of change does this PR introduce? Feature / chore: hide assistant model selection in the UI and default chats to GPT-5.6 Luna. ## What is the current behavior? The assistant composer exposes a model picker. Paid orgs default to `gpt-5.3-codex`; everyone else defaults to `gpt-5.4-nano`. ## What is the new behavior? - The model picker is hidden in the assistant composer and Explorer home. - Chats default to `gpt-5.6-luna` with `reasoningEffort: medium`. - Model selection plumbing is kept (registry, entitlements, `setModel`, generate-v4 request body) so a requested model can still be honored when provided. - Other completion endpoints still use `gpt-5.4-nano`. ## Additional context Model selector UI can be re-enabled by passing `selectedModel` / `onSelectModel` to `AssistantChatForm`. <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Added support for the GPT-5.6 Luna model with medium reasoning capability. * Made GPT-5.6 Luna the default assistant model. * **Improvements** * Simplified assistant chat by removing model selection from the primary chat experience. * Updated model fallback behavior to use the standard assistant model. * Chat forms can now optionally display model selection when configured. * **Tests** * Updated model coverage and assistant chat tests for the new defaults and behavior. <!-- end of auto-generated comment: release notes by coderabbit.ai --> --------- Co-authored-by: Cursor <cursoragent@cursor.com>