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How smart is Qwen 3.5 Plus (hosted 397B-A17B)?

109 SI-IQ · 90% interval 103–115
Not ranked: too little data

Qwen 3.5 Plus (hosted 397B-A17B) is a model from Alibaba, released on Feb 16, 2026. Its SI-IQ is 109 (90% interval 103–115), estimated from 5 benchmark results by 1 independent evaluators. Its strongest area is Knowledge and its weakest is Reasoning.

This model has fewer than 5 independent benchmark results or fewer than 2 different evaluators, so it is shown but not ranked.

Facts

Developer: Alibaba
Released: Feb 16, 2026
Access: Not stated
Benchmarks used: 5 results from 1 evaluators

Ability by area (SI-IQ, 90% interval)

Every benchmark result we used

Each score is one value exactly as the source published it: for Epoch AI the best of its run settings, for OpenRouter the median hosting provider (the developer's own hosting when it ran the test). “Implied SI-IQ” is the ability that this single result points to; the overall SI-IQ is their precision-weighted average.

Benchmark	Area	Score	Implied SI-IQ	Evaluated by	As listed by the source	Retrieved	Source
Chess Puzzles	Reasoning	8.0%	89	Epoch AI	`qwen3.5-plus`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
Mystery Game Puzzles	Reasoning	17.0%	109	Epoch AI	`qwen3.5-plus_none`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
OTIS Mock AIME 2024–2025	Math	86.7%	113	Epoch AI	`qwen3.5-plus`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
GPQA Diamond	Knowledge	84.8%	114	Epoch AI	`qwen3.5-plus`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
SimpleQA Verified	Knowledge	25.4%	103	Epoch AI	`qwen3.5-plus`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file

Computed with SI-IQ method version 1.0.0. Read the full methodology

Data sources: Epoch AI, ‘Capabilities & benchmarking’ (CC BY 4.0).