# xAI: Grok 4 Fast

Provider: x-ai  
Category: llm  
Model ID: `x-ai/grok-4-fast`

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...

## Specs

- Context length: 2000000 tokens
- Max output: 30000 tokens
- Modalities: text, image, file
- Released: 2025-09-19

## Pricing

- Input: $0.20 per million tokens
- Output: $0.50 per million tokens

## Providers

- **x-ai** — ctx 2000000, input $0.20/M, output $0.50/M

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Last verified: 2026-04-23T23:46:29.618Z  
Canonical URL: https://switchy.build/models/grok-4-fast