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Grok 4 Fast — and what?

Pricing per million tokens, context window, capabilities — pulled from each provider's public docs. All 1 are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.

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Grok 4 Fast
xai/grok-4-fast
Provider
xAI
Family
Grok 4
Modality
text
Context window
256,000 tok
Max output
16,384 tok
Released
2025-09-19
License
Proprietary
Input price
$0.500 /1M
Output price
$2.00 /1M
Tools
yes
Streaming
yes
Vision
JSON mode
yes
Reasoning
Prompt caching
Batch API
Try it
Open in playground →
Grok 4 Fast
xai/grok-4-fast
Full spec →

xAI Grok 4 Fast — low-latency variant.

Strengths
  • General-purpose chat
  • Long context
  • Tool use
Use cases
ChatbotsContent generationAgentic workflows

Compare with another

Grok 4 vs Grok 4 Fast
xai/grok-4 · xai/grok-4-fast
Grok 4.20 Multi-Agent vs Grok 4 Fast
xai/grok-4.20-multi-agent-0309 · xai/grok-4-fast
Grok 4 Fast vs Grok 4.20 Non-Reasoning
xai/grok-4-fast · xai/grok-4.20-0309-non-reasoning
Grok 4 Fast vs Grok 4.20 Reasoning
xai/grok-4-fast · xai/grok-4.20-0309-reasoning
Grok 4 Fast vs Grok 4.3
xai/grok-4-fast · xai/grok-4.3