Claude Haiku 4.5
ECI#96
142Claude Haiku 4.5 is a closed-weights model from Anthropic, released October 15, 2025. It has an ECI score of 142 and ranks 96th of 249 tracked models. At the time of its release, it ranked 19th of 169 tracked models. At $1/Mtok for input tokens and $5/Mtok for output tokens, it is more expensive per token than similarly-capable models.
Input price$1 / 1M tokens
Output price$5 / 1M tokens
ParametersUnknown
Training computeUnknown
Claude Haiku 4.5 vs select alternatives
Reasoning
| Domain | Benchmark | Claude Haiku 4.5 | |||
|---|---|---|---|---|---|
ECI scoreBest score 166 | 142 | 142 | 143 | 142 | |
| Ranking | #96 | #99 | #90 | #95 | |
| Agent | Vending-Bench 2Best score 11181.9 | 458.9 | — | — | 71.6 |
| Conceptual reasoning | ARC-AGI-2Best score 95.0% | ||||
ARC-AGI-1Best score 98.5% | |||||
| Games | Chess PuzzlesBest score 72.0% | ||||
| Mathematics | MATH Level 5Best score 98.1% | ||||
OTIS Mock AIME 2024-2025Best score 100.0% | |||||
| Science | GPQA DiamondBest score 95.8% | ||||
| Software engineering | WeirdML (v2)Best score 92.9% | ||||
| World knowledge | SimpleQA VerifiedBest score 75.6% |
