Arena ranks Meta's Muse Ember #25 in Agent Arena at about $0.02 per task

Arena says Meta's Muse Ember (Max) ranks #25 overall in Agent Arena, with a +1.7% net improvement, across 6,000 agentic sessions from its community. It calls that on par with Muse Wonder (Max) at #24.

Arena compares it with two other small models:

| Model | Rank | Net improvement | Cost per task | Time per task | Output tokens | | --- | --- | --- | --- | --- | --- | | Muse Ember (Max) | #25 | +1.7% | $0.02 | 0.5 min | 11.6K | | GPT-6 Luna (Max) | #26 | +1.6% | $0.09 | 6 min | 41.2K | | Claude Haiku 5.5 (High) | #29 | +0.5% | $0.08 | 1.8 min | 24.3K |

Arena says Ember's median task costs roughly 4x less than the other two, finishes about 12x faster than Luna and 3.5x faster than Haiku 5.5, and uses 72% and 52% fewer output tokens. These are Arena's own figures.