Home › AI Models › xAI › xAI: Grok 4 Fast
xAI

xAI: Grok 4 Fast

Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model...

Context Window
2000K tokens
Parameters
N/A
Input Price
$0.20/1M
Output Price
$0.50/1M
Price Tier
budget
Provider
xAI

How to Use xAI: Grok 4 Fast

With CoreAI, you can start chatting with xAI: Grok 4 Fast instantly — no separate subscription needed. CoreAI bundles access to xAI: Grok 4 Fast along with 300+ other AI models from xAI and other providers like OpenAI, Anthropic, Google, Meta, and more.

  1. Download the CoreAI app for iOS, Android, or use the Web App
  2. Select xAI: Grok 4 Fast from the model selector
  3. Start chatting, comparing, or creating with AI

More xAI Models

xAI

xAI: Grok 4.3

Grok 4.3 is a reasoning model from xAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following
1000K standard
xAI

xAI: Grok 4.20 Multi-Agent

Grok 4.20 Multi-Agent is a variant of xAI’s Grok 4.20 designed for collaborative, agent-based workflows. Multiple agents operate in parallel to conduc
2000K standard
xAI

xAI: Grok 4.20

Grok 4.20 is a reasoning model from xAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate o
2000K standard
xAI

xAI: Grok 4.1 Fast

Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window.
2000K budget
xAI

xAI: Grok Code Fast 1

Grok Code Fast 1 is a speedy and economical reasoning model that excels at agentic coding. With reasoning traces visible in the response, developers c
256K standard
xAI

xAI: Grok 4

Grok 4 is xAI's latest reasoning model with a 256k context window. It supports parallel tool calling, structured outputs, and both image and text inpu
256K premium

Try xAI: Grok 4 Fast Now

Chat with xAI: Grok 4 Fast and 300+ other AI models — all in one app.

Download App → Try on Web App