xAI: Grok 4 Fast

2M context$0.20/M input$0.50/M output

x-ai/grok-4-fast

Description

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...

Quick Start

curl https://router.tangle.tools/v1/chat/completions \
  -H "Authorization: Bearer $TANGLE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "x-ai/grok-4-fast",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Modalities

Input: TextInput: ImageInput: FileOutput: Text

Pricing

Input$0.20/M

Output$0.50/M

Context2M tokens

Model Info

Providerx-ai

IDx-ai/grok-4-fast

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