Grok 4.3 Beta
ECI#51
149Grok 4.3 Beta is a closed-weights model from xAI, released April 17, 2026. It has an ECI score of 149 and ranks 51st of 249 tracked models. At the time of its release, it ranked 19th of 205 tracked models.
Grok 4.3 Beta vs select alternatives
| Domain | Benchmark | Grok 4.3 Beta | |||
|---|---|---|---|---|---|
ECI scoreBest score 166 | 149 | 146 | 152 | 149 | |
| Ranking | #51 | #66 | #38 | #52 | |
| Agent | Vending-Bench 2Best score $11,182 | $35 | — | $4,663 | $3,285 |
| 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 | Text Arena (Coding)Best score 1797 | 1357 | — | 1374 | 1464 |
WeirdML (v2)Best score 93% | |||||
| World knowledge | SimpleQA VerifiedBest score 76% |
