xAI·released 2025-09-191 source
Grok 4 Fast benchmark scores: 5 benchmarks tracked. 0% of its scores are independently reproduced — the rest are self-reported or unverified.
Leads on 0 of 5 benchmarks·best result 94.4 on Fiction.LiveBench (unverified)·0 of 5 independently reproduced
| Benchmark | Score | Evidence status | Measured |
|---|---|---|---|
| Fiction.LiveBench | 94.4accuracy (%) | unverifiedT1 | 2025-09-19Fiction.live leaderboard |
| ARC-AGI | 48.5accuracy (%) | unverified· optimizedT2 | 2025-09-19 |
| WeirdML | 42.86accuracy (%) | unverifiedT1 | 2025-09-19WeirdML Leaderboard |
| Cybench | 30accuracy (%) | self-reported· optimizedT1 | 2025-09-19Grok 4 Fast Model Card |
| ARC-AGI-2 | 5.28accuracy (%) | unverifiedT2 | 2025-09-19 |
Claims drawn from cited facts, not live model generation.
This model was developed by xAI and released in 2025.
2 cited facts
With five scored benchmarks and no lead, the evidence base is thin — hold conclusions loosely in both directions. Because these scores are self-reported, they are vendor-claimed and not independently confirmed, so they should be read as claims rather than verified results.
3 cited facts
The model trails the leader by an average of 49.68 points, a wide gap indicating it is well behind the leading models.
1 cited fact
1 facts cross-checked across data sources: 1 single-source.
Source facts, citations, and refresh stamp for this record.
Sources: epoch_benchmarks
Grok 4 Fast is an AI model developed by xAI, released 2025-09-19. Its benchmark record below tags every score as independently reproduced, self-reported, or unverified.
Grok 4 Fast has recorded scores on 5 benchmarks, each shown with its evidence status.
Grok 4 Fast has recorded scores on 5 benchmarks — WeirdML, Cybench, ARC-AGI, Fiction.LiveBench, ARC-AGI-2. The full table above shows each score with its evidence status.
0 of 5 recorded scores (0%) are independently reproduced rather than self-reported by the lab.
Grok 4 Fast has 5 tracked claims: 1 self-reported, 4 unverified.