Grok 3 Fast

Fast

grok-3-fast · Grok · text

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Platform

xAI Grok

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API Pricing

Input / 1M

$0.2/M$0.14/M30% OFF

Output / 1M

$0.5/M$0.35/M30% OFF

Cache Read / 1M

$0.05/M$0.035/M30% OFF

Overview

Grok 3 Fast is a faster, lower-cost variant of Grok 3 for high-concurrency production tasks.

Capabilities

128K context; fast inference; real-time data; tool calling.

Use Cases

High-concurrency APIs; real-time chat; cost-sensitive workloads.

Limitations

Lower reasoning depth than Grok 3; 128K context.

Examples

Claude Code

Anthropic official CLI coding agent. Multi-file edits, tool use, long-context reasoning.

Terminal

export ANTHROPIC_AUTH_TOKEN="YOUR_API_KEY"
export ANTHROPIC_BASE_URL="https://api.robovai.com"
export ANTHROPIC_MODEL="grok-3-fast"
claude --dangerously-skip-permissions

Context Window

131K ctx

Thinking Mode

Not supported

Overview

xAI Grok 3 Fast, a faster, lower-cost variant of Grok 3 for high-concurrency production tasks.