xAI: Grok 4 Fast

X-AI Developer Architecture Profile

Intelligence (ELO)1443Chatbot Arena Verified

Max Context2,000,000Tokens

API Cost / 1M$0.70Blended Prompt + Completion

Model Capabilities

Reasoning
Coding & Logic
Fictional

Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model...

Granular Pricing Matrix

Input Tokens (Prompt)$0.20 / 1M

Output Tokens (Completion)$0.50 / 1M

Pricing data via OpenRouter. Sync: 4/30/2026

Evaluate Competitors

VS Engine MatchupxAI: Grok 4 Fast vs Z.ai: GLM 4.7 VS Engine MatchupxAI: Grok 4 Fast vs Nex AGI: DeepSeek V3.1 Nex N1 VS Engine MatchupxAI: Grok 4 Fast vs MoonshotAI: Kimi K2 0905 VS Engine MatchupxAI: Grok 4 Fast vs Baidu: ERNIE 4.5 21B A3B VS Engine MatchupxAI: Grok 4 Fast vs Baidu: ERNIE 4.5 VL 28B A3B VS Engine MatchupxAI: Grok 4 Fast vs AlfredPros: CodeLLaMa 7B Instruct Solidity