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xAIProprietary

Grok 4 Fast

Grok 4 Fast is a foundation model developed by xAI. It is designed as a chat-specialized model with a large context window.

Parameters

Undisclosed

Context Window

2000K

License

Proprietary

Release Date

2025-09-19

API Pricing

API pricing for this model is not yet available

Strengths

  • ・Very long context understanding of 2000K
  • ・High optimization for chat
  • ・Latest design by xAI

Weaknesses

  • ・Non-open-source license
  • ・Lack of detailed performance metrics
  • ・Closed restrictions on use

Use Cases

  • ・Analysis of ultra-long documents
  • ・Advanced conversational AI chat
  • ・Processing with massive context