LLM
gemini-2.5-flash is the fastest. gemini-3.5-flash is the good balance of intelligence and speed.
Assistants
Provider & model reference
The exact strings the config takes, tested by us end to end. Newer model ids that are not listed may exist and work — the assistant config doesn’t necessarily block them, as we pass it to the provider APIs directly — but we update this page only after testing a model ourselves on real calls. An unlisted string that doesn’t work fails at dial time, with a caller on the line.
Per-provider knobs, defaults, and BYOK keys are on the config tabs of Create an assistant. What we’d pick: Recommended stack.