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Grok 4 Fast specs, prices, where it runs and its benchmark standing

closed weights · top 10 on 0 of 2 · released Sep 19, 2025

Facts

Provider
SpaceXAI
Release date
Sep 19, 2025
Boards
Parameters
Not disclosed by SpaceXAI
Modalities
Text to Text
Boards
License
Proprietary
LMArena
Weights
Closed weights
Benchmarks
2 boards captured
RankBoardScore
34Search ArenaAgents and tools · as “Grok 4 Fast (Search)”1,161
90Epoch ECIReasoning · as “Grok 4 Fast”144.3

Versions and release history

2 versions in this line since Sep 19, 2025, from Pricing, OpenRouter and the boards.

VersionReleased
Grok 4 1 FastNov 1, 20251 year ago
Grok 4 Fastthis modelSep 19, 20251 year ago
Category ranks, more models and catalog changes