| Signal | Grok 4 Fast | Delta | Qwen3.5-Flash |
|---|---|---|---|
Capabilities | 100 | +17 | |
Benchmarks | 70 | +3 | |
Pricing | 100 | 0 | |
Context window size | 100 | +5 | |
Recency | 90 | -10 | |
Output Capacity | 75 | -6 | |
| Overall Result | 3 wins | of 6 | 3 wins |
Score History
72.5
current score
Grok 4 Fast
right now
68.7
current score
xAI
Alibaba
Qwen3.5-Flash saves you $25.50/month
That's $306.00/year compared to Grok 4 Fast at your current usage level of 100K calls/month.
| Metric | Grok 4 Fast | Qwen3.5-Flash | Winner |
|---|---|---|---|
| Overall Score | 73 | 69 | Grok 4 Fast |
| Rank | #80 | #109 | Grok 4 Fast |
| Quality Rank | #80 | #109 | Grok 4 Fast |
| Adoption Rank | #80 | #109 | Grok 4 Fast |
| Parameters | -- | -- | -- |
| Context Window | 2000K | 1000K | Grok 4 Fast |
| Pricing | $0.20/$0.50/M | $0.07/$0.26/M | -- |
| Signal Scores | |||
| Capabilities | 100 | 83 | Grok 4 Fast |
| Benchmarks | 70 | 66 | Grok 4 Fast |
| Pricing | 100 | 100 | Qwen3.5-Flash |
| Context window size | 100 | 95 | Grok 4 Fast |
| Recency | 90 | 100 | Qwen3.5-Flash |
| Output Capacity | 75 | 80 | Qwen3.5-Flash |
Our score (0-100) is driven by benchmark performance (90%) from Arena Elo ratings, MMLU, GPQA, HumanEval, SWE-bench, and 15+ standardized evaluations. Capabilities and context window serve as tiebreakers (10%). Learn more about our methodology.
Scores 73/100 (rank #80), placing it in the top 73% of all 290 models tracked.
Scores 69/100 (rank #109), placing it in the top 63% of all 290 models tracked.
With only a 4-point gap, these models are in the same performance tier. The practical difference in output quality is minimal - your choice should depend on pricing, latency requirements, and specific feature needs.
Qwen3.5-Flash offers 54% better value per quality point. At 1M tokens/day, you'd spend $4.88/month with Qwen3.5-Flash vs $10.50/month with Grok 4 Fast - a $5.63 monthly difference.
Both models have comparable response speeds. For most applications, the latency difference is negligible.
When latency matters most: Interactive chatbots, IDE code completion, real-time translation, and user-facing applications where response time directly impacts experience. For batch processing, background summarization, or offline analysis, latency is less critical.
Code generation & review
Based on overall model capabilities and architecture for coding tasks like generating functions, debugging, and refactoring
Customer support chatbot
Suitable for user-facing chat with competitive response times. Qwen3.5-Flash also offers lower per-token costs for high-volume support
Long document analysis
Larger context window (2000K tokens) can process longer documents, contracts, and research papers in a single pass
Batch data extraction
Lower output pricing ($0.26/M) reduces costs when processing thousands of records daily
Creative writing & content
Higher overall composite score (73/100) correlates with better nuance, coherence, and style in long-form content
Image understanding & OCR
Supports vision input - can analyze screenshots, diagrams, photos, and scanned documents directly
Grok 4 Fast has a moderate advantage with a 3.799999999999997-point lead in composite score. It wins on more signal dimensions, but Qwen3.5-Flash has specific strengths that could make it the better choice for certain workflows.
Best for Quality
Grok 4 Fast
Marginally better benchmark scores; both are excellent
Best for Cost
Qwen3.5-Flash
54% lower pricing; better value at scale
Best for Reliability
Grok 4 Fast
Higher uptime and faster response speeds
Best for Prototyping
Grok 4 Fast
Stronger community support and better developer experience
Best for Production
Grok 4 Fast
Wider enterprise adoption and proven at scale
by xAI
| Capability | Grok 4 Fast | Qwen3.5-Flash |
|---|---|---|
| Vision (Image Input) | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Searchdiffers | ||
| Image Output |
xAI
Alibaba
Qwen3.5-Flash saves you $0.5310/month
That's 55% cheaper than Grok 4 Fast at 1,000 tokens/request and 100 requests/day.
Assumes 60% input / 40% output token ratio per request. Actual costs may vary based on your usage pattern.
| Parameter | Grok 4 Fast | Qwen3.5-Flash |
|---|---|---|
| Context Window | 2M | 1M |
| Max Output Tokens | 30,000 | 65,536 |
| Open Source | No | No |
| Created | Sep 19, 2025 | Feb 25, 2026 |