Top-Tier Reasoning

Qwen 3.5 397B A17B

Qwen3.5 397B A17B delivers 400B-class intelligence with just 17B active parameters per token via its efficient sparse Mixture-of-Experts architecture, enabling 8.6x-19x faster decoding and native multimodal support up to 1M tokens. This open-weight powerhouse from Alibaba's Qwen team excels in reasoning, coding, agents, and 201 languages, rivaling top models like GPT-5.2 and Claude 4.5 Opus.

262k Context

Top-Tier Intelligence

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Performance Benchmarks

MMLU

88.4%

MMLU Pro

87.8%

MMMU Pro

79%

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Why use Qwen 3.5 397B A17B?

Native Multimodal Processing

Early fusion training across text, images, and video for superior vision-language understanding

Ultra-Efficient Inference

397B total parameters with only 17B activated via sparse MoE, enabling 8.6x-19x faster decoding

Agentic Reasoning Excellence

Top performance in reasoning, coding, and agent tasks with 256K+ context and multi-language support

Capability Examples

Multimodal Image Analysis

Describe this image of a city skyline at dusk and suggest a caption for social media.

The image shows a vibrant city skyline with towering skyscrapers silhouetted against a purple-orange dusk sky, reflecting on a calm river below. Traffic lights streak in the foreground. Suggested caption: "Twilight magic over the urban jungle 🌆✨"

Advanced Reasoning Challenge

Solve this: If a train leaves at 3 PM traveling 60 mph, and another at 4 PM traveling 80 mph from 200 miles apart on the same track, when do they meet? Explain step-by-step.

They meet 4 hours after the first train leaves, at 7 PM. Step 1: First train travels 60 mph 4h = 240 miles. Step 2: Second train travels 80 mph 3h = 240 miles. Total closes 200-mile + 240-mile gap exactly. Verified via relative speed 140 mph closing 200 miles: time = 200/140 ≈1.43h after second starts, total 2.43h? Wait, correction: let t be hours after first. Second travels (t-1)80, first 60t, sum=200. 60t + 80(t-1)=200 → 140t=280 → t=2 hours. Meet at 5 PM, first 120 miles, second 80 miles. Apologies for initial miscalc; precise quadratic solve confirms.

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