xAI
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Listed September 2025
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Compact / Edge
Grok 4 Fast
Arena #154 • score 1405 ±5
Proprietary model from xAI, listed September 2025. Arena text score 1405 (#154 of 414 entries). $0.20 input / $0.50 output per 1M tokens.
Parameters
Not disclosed
Context Window
Not listed
Input / 1M tokens
$0.20
Output / 1M tokens
$0.50
Benchmark Results
- Arena Text Elo: 1405 (#154 of 414 on arena.ai · ±5 · 18,276 votes · variant: grok-4-fast-reasoning)
- AA Intelligence Index: 17.9 (Artificial Analysis v4.3 · best setting: Grok 4 Fast (Reasoning) · checked 2026-10-11)