1Meta Muse Ember
No. 1 — Meta Muse Ember. On the lists of 8 of 10 AIs; median place there: 1. It gets the top place because it matches Haiku's score of 36 for about a third of the bill, $0.14 a task.
Did you know
Meta's own table shows Muse Ember at 69.5% partial credit on OSWorld 2.1 but 33.8% fully passed. Claude Haiku 5.5 scores 68.9% partial yet only 27.8% fully passed, so the two look almost tied until you count full passes.
- What it is
- Meta's smallest, most efficient model, released on 9 November 2026.
- Its edge
- Cheapest bill: $0.14 a task against $0.41 and $0.60 for the others.
- Who it suits
- Suits cheap agent runs; Meta's own OSWorld numbers have no independent check yet.
- Bill per finished task$0.14 per task
Why it is here
Artificial Analysis calls Muse Ember the cheapest model scoring 36 on its Intelligence Index. It costs $0.14 a task, while Claude Haiku 5.5 scores 36 at $0.41.
Did you know
Muse Ember is priced at $0.10 per million input tokens and $0.50 per million output. It takes a 1M-token context and can write up to 512K tokens in one reply, which is unusually long for a model this cheap.
History
On 9 November 2026, Meta released Muse Ember, its smallest and most efficient model. It was the first model trained using Muse Wonder Full, Meta's larger model for the hardest problems.
Keep in mind
Meta's methodology page says refusals get zero credit and stay in the count. It also says model-based checks are judged by Claude Sonnet 4.6. I found no independent review of Ember's OSWorld results.
Where to go further
Start with the OSWorld 2.1 table on Meta's blog. Compare the partial-credit numbers with the binary completion numbers, since the gap shows how many tasks fully finish. The model ID is muse-ember-1.0.