Grok 3 Fast
Balanced
Speed-tuned Grok 3 with vision. Trades a few quality points for faster response, useful for chat UIs that need streaming feel.
Grok 3 Fast is a multimodal AI model from xAI. It costs $5.000 per million input tokens and $25.000 per million output tokens (blended $11.000/M), with a 131,000-token context window.
INPUT
$5.000/M
per million input tokens
OUTPUT
$25.000/M
per million output tokens
CONTEXT
131,000
tokens
What it is good at
- Fast Grok 3
- Vision-capable
- Real-time X data
Typical use cases
- Realtime chat UI
- Vision QA grounded in social media
Benchmarks
vs. best public score
Hand-curated from each provider's published reports and public leaderboards. Methodology varies across sources, treat as directional rather than authoritative.
More from xAI
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Frontier · 1,000,000 ctx
in $1.250/Mout $2.500/M
Grok 4
Previous · 256,000 ctx
in $3.000/Mout $15.000/M
Grok 3
Frontier · 131,000 ctx
in $3.000/Mout $15.000/M
Grok 3 mini
Efficient · 131,000 ctx
in $0.300/Mout $0.500/M
Grok 2
Previous · 131,000 ctx
in $2.000/Mout $10.000/M
Grok 2 Vision
Vision · 32,000 ctx
in $2.000/Mout $10.000/M
Frequently asked questions
How much does Grok 3 Fast cost?
Grok 3 Fast costs $5.000 per million input tokens and $25.000 per million output tokens, for a blended reference rate of $11.000 per million tokens.
What is Grok 3 Fast's context window?
Grok 3 Fast supports up to 131,000 tokens of context in a single request.
What is Grok 3 Fast best for?
Grok 3 Fast is well suited to Fast Grok 3, Vision-capable and Real-time X data.
Who makes Grok 3 Fast?
Grok 3 Fast is developed and served by xAI.