A lean, latency-obsessed code assistant from xAI tuned for milliseconds-to-first-token in the editor, not long-form chat.
Grok Code Fast is xAI's answer to the 'AI pair programmer that never lags' problem. Where most assistants bolt onto VS Code and eat seconds of latency per call, GCF is engineered from the ground up to return the first tokens in under 200ms on typical edits. It's not a chatty architect — it's a fast inline completion & refactor engine with deliberately scoped answers.
Who it's for: Developers who want sub-200ms inline completions and quick refactors inside the editor, and who prefer terse actionable diffs over a 10-paragraph architecture lecture.
Optimised inference pipeline returns the first code tokens in under 200ms on typical edits, keeping you in flow state.
Select a block, say 'make this async' or 'add error handling,' and get a minimal diff in your editor — no chat, no context switching.
Lightweight symbol index of your open repo so completions respect your naming and idioms without uploading the whole project.
Short retention window and opt-out training on free tier; enterprise tier offers zero retention.
First-party plugins for VS Code, JetBrains, and Neovim with the same latency profile.
Generous daily quota of completions and edits at $0; paid Grok+ tier unlocks unlimited and larger context.
Grok Code Fast is the assistant to add when latency is the thing that makes you turn AI OFF. It doesn't try to be a software architect — it tries to stay out of your way, and it succeeds. Pair it with a heavier agent (Cursor, Claude Code) for the big jobs and GCF for the thousand tiny edits that make up a workday. Free tier is real. Strong recommend.