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Grok 4.1 Fast Reasoning

Fast Grok model for responsive chat, reasoning, and tool-assisted work

Model facts

Context window
2M tokens
Maximum output
3K tokens
Cheapest paid input
$0.18 per 1M tokens
Cheapest paid output
$0.45 per 1M tokens
Open weights
no
Providers
10

Capabilities and modalities

reasoning, tool calling, structured output, attachments, temperature control, text, image, pdf.

Observed price history

  • 2026-08-24: $0.18 input / $0.45 output per 1M tokens

API providers

  • Jiekou.AI — model id grok-4-1-fast-reasoning; $0.18 input / $0.45 output per 1M tokens; provider documentation
  • 302.AI — model id grok-4-1-fast-reasoning; $0.2 input / $0.5 output per 1M tokens; provider documentation
  • Azure — model id grok-4-1-fast-reasoning; $0.2 input / $0.5 output per 1M tokens; provider documentation
  • DevPass (LLM Gateway) — model id grok-4-1-fast-reasoning; $0.2 input / $0.5 output per 1M tokens; provider documentation
  • FrogBot — model id grok-4-1-fast-reasoning; $0.2 input / $0.5 output per 1M tokens; provider documentation
  • Helicone (xAI) — model id grok-4-1-fast-reasoning; $0.2 input / $0.5 output per 1M tokens; provider documentation
  • LLM Gateway (Azure AI Foundry) — model id azure-ai-foundry/grok-4-1-fast-reasoning; $0.2 input / $0.5 output per 1M tokens; provider documentation
  • Vercel AI Gateway — model id spacexai/grok-4.1-fast-reasoning; $0.2 input / $0.5 output per 1M tokens; provider documentation
  • FrogBot — model id grok-code-fast-1; $0.2 input / $1.5 output per 1M tokens; provider documentation
  • Poe — model id xai/grok-4.1-fast-reasoning; not published input / not published output per 1M tokens; provider documentation