Grok 4.1 Fast at a glance
xAI positioned Grok 4.1 Fast as its strongest tool-calling model, with a 2M-token context window and low per-token pricing, alongside server-side agent tools.
What changed with Grok 4.1 Fast
On November 19, 2025, xAI released Grok 4.1 Fast in reasoning and non-reasoning variants and launched an Agent Tools API. The tools give agents server-side access to web search, X search, code execution, file and collection search, and remote MCP servers.
xAI says the model is tuned for fast, accurate agent work such as customer support and finance, and reports a 100% score on the τ²-bench Telecom test (verified by Artificial Analysis) plus 72% on Berkeley Function Calling v4. These are vendor-reported results.
Grok 4.1 Fast benchmarks and pricing
Values are copied from the linked source on the date shown. They are not IA Compa measurements.
- Input price per 1M tokensas of · Source for Input price per 1M tokens: x.ai (opens in a new tab)
- $0.20
- Output price per 1M tokensas of · Source for Output price per 1M tokens: x.ai (opens in a new tab)
- $0.50
- Context windowas of · Source for Context window: x.ai (opens in a new tab)
- 2M tokens
How it compares
Other models in the same category that we have covered, using each model's latest recorded value. (Agents)
Where to compare Grok 4.1 Fast
Independent leaderboards and official resources for comparing this model yourself. Rankings change often; each site shows its own current data.
Leaderboards
General leaderboards
Why Grok 4.1 Fast matters for businesses
For agencies, the draw is cost: the listed price is $0.20 per 1M input tokens and $0.50 per 1M output tokens, with tool calls from $5 per 1,000 successful invocations. That makes high-volume support or lookup agents cheaper to run, though results should be tested on your own workflows.
Put it to work: AI Agents
Sources for this story
- Official
- Release notes (opens in a new tab)Official
xAI Docs · docs.x.ai
Last verified: . IA Compa summarizes public announcements for business readers. We are not affiliated with the companies mentioned. Always confirm details, pricing, and availability with the official source.
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