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Use Grok 4.7 in Grok Build

use-grok-4-7-in-grok-build

Grok 4.7 is the default model of the Grok Build coding agent. Official: Grok Build overview, Grok 4.7. Announcement: Introducing Grok 4.7.

Install and start a session:

curl -fsSL https://x.ai/cli/install.sh | bash
cd your-project
grok

On first launch, Grok opens a browser for authentication. In non-browser environments, export an API key first:

export XAI_API_KEY="xai-..."
grok

Switch to grok-4.7

/model <id> (alias /m) switches the active model for the current session (Modes and Commands). Full picker pattern: Switch the active model in Grok Build.

  1. List catalog entries from the shell:
grok models
  1. In the TUI, send:
/model grok-4.7
/m grok-4.7

Headless and defaults

Path How
One headless run grok -p "…" -m grok-4.7
Default for new sessions [models] default = "grok-4.7" in ~/.grok/config.toml

After editing config, run grok inspect so you can see which sources loaded.

Fast in Build

Grok 4.7 Fast is the same model on faster infrastructure at 2× standard token rates. It is available in Grok Build. It is excluded from Grok Build's free tier. It is unavailable on the public xAI API. Rates and scope: Grok 4.7 Fast pricing (Cursor and Grok Build only).

Prompt tokens Input Cached input Output
Below 200k $4.00 / 1M $1.00 / 1M $12.00 / 1M
Above 200k $6.00 / 1M $1.50 / 1M $18.00 / 1M

Details and Cursor billing: Understand Grok 4.7 Fast limits.

Pitfalls

  • /effort sets reasoning effort on the current model; switch models with /model when you need a different catalog entry.
  • Fast has no public API model id — use Build or Cursor surfaces, never invent an API string.

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