Qwen 3.5
Alibaba Cloud · February 2026
● activeOpen Sourcemixture of expertstextAPI Available
Context Window128K tokens
Description
An iterative refinement of Qwen 3, focused on improving code generation quality and multilingual performance. Maintained the hybrid thinking approach while delivering more reliable outputs for software development tasks and expanding language coverage.
Key Innovations
Reasoning
ReasoningStructured step-by-step problem solving, often using chain-of-thought or tree-of-thought approaches.
MoE
MoEArchitecture where only a fraction of the model's parameters are active for each input, allowing massive scale with lower compute.
Open Weight
Open WeightModel weights are publicly released but training data/code may not be. Enables fine-tuning but not full reproduction.
Code Gen
Code GenAbility to write, debug, and understand programming code across multiple languages.