Backend (api/config.py):
- resolve_model_provider(): check custom_providers for prefix match
BEFORE the config_base_url branch. Previously, providers with a
base_url set (e.g. deepseek) would catch all slash-delimited model
ids and return the config provider, preventing custom provider
routing.
- get_available_models(): include model aliases in response so the
frontend can resolve them on /model commands.
Frontend (static/commands.js):
- cmdModel(): resolve aliases by fetching /api/models before fuzzy
matching the dropdown.
- Add bare-model fallback when the alias resolves to a slash-delimited
provider/model id (e.g. "deepseek/deepseek-v4-flash").
- Add cross-provider fallback: when the model is from a custom provider
not in the active provider dropdown, call /api/session/update directly
with the provider/model id and provider override.
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