Muse Spark 1.1 vs Llama 4 (405B)
Head-to-head technical comparison of intelligence, capabilities, and API pricing.
Muse Spark 1.1
Meta
AI Mastery Index92.3
LMSYS Arena1492
Technical (MMLU-Pro)91.9%
Cost per 1M Tokens$1.25
Llama 4 (405B)
Meta
AI Mastery Index90.5
LMSYS Arena1440
Technical (MMLU-Pro)90.5%
Cost per 1M Tokens$0
Which should you use?
Muse Spark 1.1 leads on the composite index by 1.8 points (92.3 vs 90.5).
Only Llama 4 (405B) ships open weights, which decides it outright if the workload has to run on your own hardware.
Pick Muse Spark 1.1 when
- Higher composite index — 92.3 against 90.5, a gap of 1.8 points.
- Ahead on Arena Elo by 52 points (1492 vs 1440), which is outside the board's published confidence intervals.
- Stronger on MMLU-Pro: 91.9% against 90.5%.
Pick Llama 4 (405B) when
- Open weights, so it is the only one of the two you can run on your own hardware or keep data entirely in-house.
Where these numbers come from
Figures as of 2026-09-14. Arena Elo and pricing are read from the public board and each vendor's own pricing page; see the full leaderboard for all 34 models and which columns are measured rather than estimated, or the benchmark matrix for scores benchmark by benchmark.