Experiment: sort model picker by vendor (OpenAI, Anthropic, Gemini)#4965
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Experiment: sort model picker by vendor (OpenAI, Anthropic, Gemini)#4965pierceboggan wants to merge 3 commits intomainfrom
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Conversation
Sort chat model picker endpoints by vendor priority so OpenAI models appear first, followed by Anthropic, then Gemini, then others. Auto endpoint is unaffected (always first via its category order). Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Wrap the vendor-priority sort in a check for the 'chat.modelPickerVendorOrdering' boolean treatment variable so the ordering change can be A/B tested via the experimentation framework. When the flag is unset or false, server ordering is preserved. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Replace raw experiment service call with an ExperimentBased config setting 'chat.modelPickerVendorOrdering' that can be toggled via VS Code settings or controlled via experiments. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Motivation
We want to A/B test whether reordering models in the chat model picker by vendor improves the user experience. Currently, models appear in whatever order the server returns them (roughly alphabetical), which surfaces Claude models before GPT models. This change lets us experiment with a vendor-prioritized ordering: OpenAI → Anthropic → Gemini → others.
Approach
languageModelAccess.ts: After assemblingchatEndpointsfrom the server response, sort them by vendor usingendpoint.modelProvider. The Auto endpoint is excluded from sorting (it's always first via its category order). Within each vendor group, the original server ordering is preserved (stable sort).github.copilot.chat.modelPickerVendorOrderingas anExperimentBasedboolean config (defaultfalse). This means:experimental+onExpinpackage.jsonfalseor unset, the model list is unchanged from the current server-driven order.Key files
src/extension/conversation/vscode-node/languageModelAccess.ts— sort logic + config readsrc/platform/configuration/common/configurationService.ts—ConfigKey.Shared.ModelPickerVendorOrderingdefinitionpackage.json/package.nls.json— setting registration and description