Grok 4.20
ECI#38
152Grok 4.20 is a closed-weights model from xAI, released February 17, 2026. It has an ECI score of 152 and ranks 38th of 249 tracked models. At the time of its release, it ranked 7th of 187 tracked models.
Grok 4.20 vs select alternatives
| Domain | Benchmark | Grok 4.20 | |||
|---|---|---|---|---|---|
ECI scoreBest score 166 | 152 | 146 | 152 | 152 | |
| Ranking | #38 | #66 | #40 | #36 | |
| Conceptual reasoning | ARC-AGI-2Best score 95% | ||||
ARC-AGI-1Best score 99% | |||||
| Games | Chess PuzzlesBest score 72% | ||||
| Mathematics | FrontierMath Tiers 1-3 (v2)Best score 94% | ||||
FrontierMath Tier 4 (v2)Best score 98% | |||||
OTIS Mock AIME 2024-2025Best score 100% | |||||
| Science | GPQA DiamondBest score 96% | ||||
| Software engineering | Terminal-Bench 2.0Best score 85% | ||||
| World knowledge | SimpleQA VerifiedBest score 76% |
