Side-by-side comparison · models
Grok 4 vs Grok 4 Fast
What we have checked about each, line by line. Every value shows where it came from and when we last confirmed it.
Models
Grok 4
Grok model for agentic tool use, reasoning, coding, and live assistance.
Models
Grok 4 Fast
Fast Grok model for responsive chat, reasoning, and tool-assisted work.
Checked facts
Line by line
| Measure | Grok 4 | Grok 4 Fast |
|---|---|---|
| Time to first token (ms) | 11,220 | Not checked yet |
| Output speed (tokens a second) | 73.7 | Not checked yet |
| Gpqa diamond | 87% (for 9 July 2025) | Not checked yet |
| Terminal bench | 27.2% (for 9 July 2025) | Not checked yet |
| Arc agi 2 | 16% (for 9 July 2025) | 5.3% (for 19 Sept 2025) |
| Aider polyglot | 79.6% (for 9 July 2025) | Not checked yet |
| Arc agi | 66.7% (for 9 July 2025) | 48.5% (for 19 Sept 2025) |
| Balrog | 43.6% (for 9 July 2025) | Not checked yet |
| Cybench | 43% (for 9 July 2025) | 30% (for 19 Sept 2025) |
| Deepresearch bench | 47.3% (for 9 July 2025) | Not checked yet |
| Fiction livebench | 94.4% (for 9 July 2025) | 94.4% (for 19 Sept 2025) |
| Frontiermath 2025 02 28 private | 19.7% (for 9 July 2025) | Not checked yet |
| Frontiermath tier 4 2025 07 01 private | 2.1% (for 9 July 2025) | Not checked yet |
| Gdpval | 21.1% (for 9 July 2025) | Not checked yet |
| Geobench | 45% (for 9 July 2025) | Not checked yet |
| Lech mazur writing | 76.9% (for 9 July 2025) | Not checked yet |
| Metr time horizons | 66.6% (for 9 July 2025) | Not checked yet |
| Simplebench | 60.5% (for 9 July 2025) | Not checked yet |
| Weirdml | 45.7% (for 9 July 2025) | 42.9% (for 19 Sept 2025) |
| Otis mock aime 2024 2025 | 84% (saturated benchmark: the top models all score near the ceiling) (for 9 July 2025) | Not checked yet |
| Dtbench | Not checked yet | 82.7% (for 19 Sept 2025) |
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