Decision support
Composer 1.5 vs X-Ai/Grok-4-Fast-Reasoning
Compare canonical objects directly. The useful dimensions change with the object type, so model and hardware comparisons stay separate.
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Benchmark results
Arena Text
Arena rating · Higher is better
- Composer 1.5Not reported
- X-Ai/Grok-4-Fast-Reasoning1405Arena #161CI 1400 to 1410
Runs and sources
Composer 1.5Not reported
X-Ai/Grok-4-Fast-Reasoning- default1405reasoning · 95% CI 1400 to 1410 · 18,206 votes
Arena WebDev
Arena rating · Higher is better
- Composer 1.5Not reported
- X-Ai/Grok-4-Fast-Reasoning1162Arena #155CI 1134 to 1190
Runs and sources
Composer 1.5Not reported
X-Ai/Grok-4-Fast-Reasoning- default1162reasoning · 95% CI 1134 to 1190 · 715 votes
Each model's best published result is shown; "Not reported" means no matched evaluation, not a score of zero. Arena and DeepSWE ranks are the leaderboards' own; other ranks are among catalogue models with a score. Results from different harnesses or settings are not directly comparable.
Arena ratings: Arena (lmarena-ai/leaderboard-dataset), licensed CC BY 4.0. Ratings come from pairwise human votes and are only comparable within one leaderboard; the interval is Arena's 95% confidence interval. Model names are matched to the Vertical Tabs catalog.
Model specifications
API pricing · USD per 1M tokens
Capabilities and modalities
Architecture and availability
A dash means the field is not reported. Provider-specific performance and pricing may differ.