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Grok 4.1 Fast
xai·xai/grok-4.1-fast-2·Deprecated·Closed·grok series
xAI's fast agentic tool-calling model with a 2M context window; non-reasoning variant for low-latency responses
At a glance
Reference price$0.20 / $0.50 per 1M
Cache read $0.05 · Ofox
Lowest paid$0.20 / $0.50
ZenMux Gateway · 1× spread
Context2,000,000
Output limit30,000
Capabilities
Reasoning✓ Tool use✓ Structured output✓ Temperature✓ Attachments
⚠ Providers report capability flags inconsistently
Modalities
TextImage
Knowledge cutoff2025-01-01
Released / updated2025-11-19 / 2025-11-19
Quality & performanceArtificial Analysis · Intelligence Index v4.1 · rep. tier Reasoning
Intelligence31.3
Value114
Coding—
Agentic—
Output speed—
TTFT—
Value formulaIQ 31.3 ÷ min blended $0.275 = 114
Reasoning tier → intelligence / speed (higher tier = stronger but slower)
Non-reasoningIQ 17
ReasoningIQ 31.3
Quality is independently evaluated by Artificial Analysis. Speed/latency are model-level medians.
Available at 2 providers2 with public prices
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
Your usage cost
1ZenMux$47.00
2Ofox$47.00
The cheapest paid channel is the only channel.
Related models
Grok 4.6same series$2.00 / $6.00Grok 4.6 (xAI)same series$2.00 / $6.00Grok 4.6 (AWS Bedrock)same series$2.00 / $6.00Lyria 3 Clip Previewcheaper alternative$0 / $0Gemini 2.0 Flash-Litecheaper alternative$0.075 / $0.30Lyria 3 Pro Previewcheaper alternative$0 / $0
Price historyone sample accumulated per data sync
Input listOutput listMin blended