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x-ai/grok-4.2-fast — xAI: Grok 4.2 Fast pricing, specs and API usage

Speed tier of Grok 4.2 with 2M context.

TextImageLong contextAgents & toolscheaplong-contexttools

Specifications

Context window
2M
Max output tokens
32,768
Released
2026-05
Infra providers
3
Throughput
176 tok/s
Latency (TTFB, sample)
285 ms
Capabilities
Supports tools

Pricing

per million tokens

Input
$0.20
Output
$0.50
Blended (3:1)
$0.28

Use this model

Works with any OpenAI SDK — same request shape, different model id.

curl https://api.lokarouter.id/v1/chat/completions \  -H "Authorization: Bearer sk-lkr-your-key" \  -H "Content-Type: application/json" \  -d '{    "model": "x-ai/grok-4.2-fast",    "messages": [{ "role": "user", "content": "Hello" }]  }'

Sample data for demonstration — connect your workspace for live stats.