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grok-4-fast-reasoning
xai·xai/grok-4-fast-reasoning-2·GA·Closed·grok series
Fast Grok model for responsive chat, reasoning, and tool-assisted work
At a glance
Reference price$0.20 / $0.50 per 1M
Cache read $0.05 · Poe
Lowest paid$0.18 / $0.45
Jiekou.AI Gateway · 1.1× spread
Context2,000,000
Output limit128,000
Capabilities
✓ Reasoning✓ Tool use✓ Structured output✓ Temperature✓ Attachments
⚠ Providers report capability flags inconsistently
Modalities
TextImage
Knowledge cutoff2025-06
Released / updated2026-01 / 2026-01
Quality & performance
Artificial Analysis doesn't cover this model (267 of 2059 have data). Quality data comes from independent evals covering widely used models.
Available at 3 providers3 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
1Poe$47.00
2Jiekou.AI$58.50
3302.AI$65.00
The cheapest paid channel is the only channel.
Benchmark
No upstream benchmark data for this model. For quality, see the Artificial Analysis intelligence score above.
Reasoning control
Upstream provides no control info
2 / 3 providers expose no reasoning control (reasoning_options: []).
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 / $6.00Qwen Pluscheaper alternative$0.115 / $0.287Qwen3.7 Flashcheaper alternative$0.03 / $0.118Qwen Flashcheaper alternative$0.022 / $0.216Qwen Turbocheaper alternative$0.044 / $0.087
Price historyone sample accumulated per data sync
Input listOutput listMin blended