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Grok 4 Fast

GrokvFastCurrent
byxAIxAI(ai lab)
Released September 19, 2025
API DocsPlayground
Context2M tokens
Price (In / Out)$0.20/M / $0.50/M
CategoryMultimodal LLM
Max Output30K tokens

About Grok 4 Fast

Grok 4 Fast is a multimodal llm from xAI. Supports up to 2,000,000 token context window. Available from $0.20/M input tokens.

Capabilities

textvisioncode

Input Modalities

textimagefile

Output Modalities

text

Technical Details

API Identifier
x-ai/grok-4-fast
Category
Multimodal LLM
Context Window
2,000,000 tokens
Max Output Tokens
30,000 tokens

Tags

multimodalbudget-friendlylong-context

Pricing

Token pricing for Grok 4 Fast API usage.

Input Tokens

$0.20/M

per million tokens

Output Tokens

$0.50/M

per million tokens

Pricing Calculator

Input cost$0.20
Output cost$0.25
Estimated monthly cost$0.45

Cache read: $0.0500/M tokens

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1 Tools4 ModelsFounded 2023Palo Alto, California
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