Claude Haiku 4.5
ECI#100
142Claude Haiku 4.5 is a closed-weights model from Anthropic, released October 15, 2025. It has an ECI score of 142 and ranks 100th of 253 tracked models. At the time of its release, it ranked 18th of 168 tracked models.
Claude Haiku 4.5 vs select alternatives
| Domain | Benchmark | Claude Haiku 4.5 | |||
|---|---|---|---|---|---|
ECI scoreBest score 167 | 142 | 142 | 143 | 142 | |
| Ranking | #100 | #104 | #96 | #101 | |
| Agent | Vending-Bench 2Best score $15,515 | $459 | — | — | $72 |
| Conceptual reasoning | ARC-AGI-2Best score 95% | ||||
ARC-AGI-1Best score 99% | |||||
| Games | Chess PuzzlesBest score 72% | ||||
| Mathematics | MATH Level 5Best score 98% | ||||
OTIS Mock AIME 2024-2025Best score 100% | |||||
| Science | GPQA DiamondBest score 96% | ||||
| Software engineering | WeirdML (v2)Best score 94% | ||||
| World knowledge | SimpleQA VerifiedBest score 76% |
