LLM Comparison
Grok 4.1 Fast vs Qwen3.5-27B
Side-by-side specs, pricing & capabilities · Updated April 2026
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2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | 73 82.7 | |
| Family | Grok | Qwen |
| Status | Current | Current |
| Release Date | Nov 2025 | Feb 2026 |
| Context Window | 2.0M tokens | 262K tokens |
| Input Price | $0.20/M tokens | $0.20/M tokens |
| Output Price | $0.50/M tokens | $1.56/M tokens |
| Pricing Notes | Cache read: $0.0500/M tokens | — |
| Capabilities | textvisioncode | textvisionvideocode |
| Max Output | 30K tokens | 66K tokens |
| API Identifier | x-ai/grok-4.1-fast | qwen/qwen3.5-27b |
| Benchmarks | ||
| MMLU-Pro | — | 86.1alibaba |
| GPQA Diamond | — | 85.5alibaba |
| SWE-bench Verified | — | 72.4alibaba |
| MathVision | — | 86alibaba |
| TAU2-Bench | — | 79alibaba |
| IFEval | — | 91.5alibaba |
| View Grok 4.1 Fast | View Qwen3.5-27B | |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Grok 4.1 FastCheapest | $0.20 | $0.25 | $0.45 | — |
| Qwen3.5-27B | $0.20 | $0.78 | $0.98 | +117% |
xAI
Grok 4.1 Fast
Grok 4.1 Fast is a multimodal llm from xAI. Supports up to 2,000,000 token context window. Available from $0.20/M input tokens.
Alibaba
Qwen3.5-27B
Qwen3.5-27B is a multimodal llm from Alibaba. Supports up to 262,144 token context window. Achieves 87.5% on MMLU. Available from $0.20/M input tokens.
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