xAI: Grok 4 Fast vs Qwen: Qwen3.5-27B
Head-to-head API cost, context, and performance comparison. Synced at 11:20:12 AM.
Executive Summary
When evaluating xAI: Grok 4 Fast against Qwen: Qwen3.5-27B, the pricing structure is a key differentiator. xAI: Grok 4 Fast is approximately 60% more cost-effective per 1 million tokens overall.
However, when looking at raw reasoning capabilities, Qwen: Qwen3.5-27B leads with a statistical ELO score of 1120. For tasks involving complex logic, coding, or instruction-following, developers might prefer Qwen: Qwen3.5-27B, provided their budget allows for the API burn rate.
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Raw Technical comparison
Verdict
If you are looking for pure performance and capability, Tie is statistically superior. However, if API burn rate is the primary concern, xAI: Grok 4 Fast wins out aggressively in pricing.
People Also Ask
Is xAI: Grok 4 Fast cheaper than Qwen: Qwen3.5-27B?
Yes. xAI: Grok 4 Fast is cheaper for both input and output generation compared to Qwen: Qwen3.5-27B. Exploring alternatives often yields cost reductions.
Which model has the larger context window?
The xAI: Grok 4 Fast model has the advantage in memory, offering a massive 2,000,000 token limit for document ingestion.