GPT-6 Astra vs Muse Spark 1.1
Head-to-head technical comparison of intelligence, capabilities, and API pricing.
Which should you use?
GPT-6 Astra leads on the composite index by 4.4 points (96.7 vs 92.3).
Their Arena Elo differs by only 4 points, inside the confidence intervals the public board reports, so human preference does not separate them.
Cost is the sharper difference: GPT-6 Astra is 8x the input price of Muse Spark 1.1 ($10 against $1.25 per 1M), so at volume the choice is usually decided by budget rather than benchmarks.
Pick GPT-6 Astra when
- Higher composite index — 96.7 against 92.3, a gap of 4.4 points.
- Stronger on MMLU-Pro: 95.8% against 91.9%.
Pick Muse Spark 1.1 when
- Cheaper input tokens — $1.25 against $10 per 1M, so GPT-6 Astra costs 8x as much to feed.
- Better value per point of measured capability: $0.014 per index point against $0.103.
Value per point of measured capability, at list input pricing: Muse Spark 1.1 $0.014 · GPT-6 Astra $0.103 per index point. Run your own token mix through the token cost calculator — a comparison at list price ignores caching and batch discounts, which move real bills more than this gap does.
Where these numbers come from
Figures as of 2026-09-07. 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.
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