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AI Radar
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Curated AI Intelligence Est. 2026
Status: Stable

Grok 4 Fast

Provider: xAI Family: Grok 4 Stable
Official docs
analytics

Capabilities

Context window 2.0M Tokens
Status Stable xAI
Release Sep 2025
Input Price $0.200 / 1M Tokens
Output Price $0.500 / 1M Tokens
OpenRouter ID x-ai/grok-4-fast

Schnellere bzw. günstigere Variante der Grok-4-Klasse.

Recommended for

  • arrow_right Kostensensitive Produktions-Workloads

Use Cases

  • arrow_right Klassifikation, Extraktion, Routing, Zusammenfassungen in großem Volumen

Technical specs

  • Model ID
    grok-4-fast
  • Family Grok 4
  • Context window 2.0M
  • Release 9/19/2025
terminal Official docs

Benchmarks

Arena Performance · lmarena.ai

Chat #2 / 87
1 Claude Opus 4.6 1,476
4 Claude Sonnet 4.6 1,389
6 Kimi K2.5 1,355
2 Grok 4 Fast 1,338
7 GLM-5 1,318
3 DeepSeek-V3.2-Exp 1,300
8 Qwen3.5-397B-A17B 1,295
Games #5 / 94
1 Claude Opus 4.6 1,550
2 Claude Sonnet 4.6 1,401
3 GPT-5.4 1,270
4 Gemini 3.1 Pro Preview 1,235
5 Grok 4 Fast 1,190
6 DeepSeek-V3.2-Exp 1,155

SWE-Bench Verified

Overall 71.8% #8/77 open_in_new

Timeline

History

4/1/2026 · 1d ago

First captured in AI Radar

xAI

9/19/2025 · Sep 2025

Model release

Grok 4 Fast

open_in_new Source