grok-code-fast-1
A cheap, fast reasoning model built for agentic coding. It hits 70.8% on SWE-bench Verified at $0.20/$1.50 per million tokens and about 190 tokens per second.
Priced and tuned for tool-heavy coding loops rather than peak intelligence. Debuted in stealth as 'sonic' the week before, and launched free through GitHub Copilot, Cursor, Cline, Windsurf and others.
- Date
- Thursday, 28 August 2025
- Lab
- xAI
- Kind
- model
- Access
- closed API
- Price
- $0.20 in / $1.50 out / $0.02 cached per 1M tokens, Aug 2025
Figures
| Measure | Value | Measured by |
|---|---|---|
| SWE-bench Verified | 70.8% xAI internal harness, full set | company |
| Output speed | ~190 tokens/s xAI measurement | company |
Sources
This record was checked against its sources on 6 October 2026. How we check