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What is Qwen3.5?

Qwen3.5 is an advanced open-weight multimodal AI system built to serve as the foundation for native digital agents capable of reasoning across text, images, and video. The primary release, Qwen3.5-397B-A17B, introduces a hybrid architecture that combines Gated DeltaNet linear attention with a sparse mixture-of-experts design, activating just 17 billion parameters per inference pass while maintaining a total parameter count of 397 billion. This selective activation dramatically improves decoding throughput and cost efficiency without sacrificing benchmark-level performance. Qwen3.5 demonstrates strong results across knowledge, multilingual reasoning, coding, STEM tasks, search agents, visual question answering, document understanding, and spatial intelligence benchmarks. The hosted Qwen3.5-Plus variant offers a default one-million-token context window and integrated tool usage such as web search and code interpretation for adaptive problem-solving. Expanded multilingual support now covers 201 languages and dialects, backed by a 250k vocabulary that enhances encoding and decoding efficiency across global use cases. The model is natively multimodal, using early fusion techniques and large-scale visual-text pretraining to outperform prior Qwen-VL systems in scientific reasoning and video analysis. Infrastructure innovations such as heterogeneous parallel training, FP8 precision pipelines, and disaggregated reinforcement learning frameworks enable near-text baseline throughput even with mixed multimodal inputs. Extensive reinforcement learning across diverse and generalized environments improves long-horizon planning, multi-turn interactions, and tool-augmented workflows. Designed for developers, researchers, and enterprises, Qwen3.5 supports scalable deployment through Alibaba Cloud Model Studio while paving the way toward persistent, economically aware, autonomous AI agents.

What is Leanstral?

Leanstral is an open-source AI coding agent introduced by Mistral AI to support the development of formally verified software and mathematical proofs using Lean 4. The model is specifically designed for proof engineering, allowing it to generate code and automatically verify its correctness against formal specifications. Lean 4 is a powerful proof assistant used in advanced mathematics and software verification, and Leanstral is the first AI agent built specifically to operate within this environment. Instead of relying on general-purpose coding models, Leanstral is trained to work directly with formal repositories and structured proof systems. The model uses a sparse architecture with efficient active parameters, enabling it to deliver strong reasoning performance while maintaining computational efficiency. Leanstral can leverage Lean’s verification capabilities to test and validate generated solutions through parallel inference processes. This approach helps ensure that AI-generated code adheres strictly to defined logical and mathematical requirements. The model supports integration with development tools and model communication protocols, enabling it to function within broader AI-assisted coding environments. Benchmarks demonstrate that Leanstral can outperform many large open-source models in proof engineering tasks while operating at a lower cost. Its design allows developers to automatically generate proofs, verify algorithms, and build mathematically sound software implementations. Released under the Apache 2.0 license, Leanstral can be downloaded, fine-tuned, and deployed in private infrastructure. By combining automated coding with formal verification, Leanstral represents a significant step toward building trustworthy AI systems for critical software and research applications.

Media

Media

Integrations Supported

APIFree
Alibaba Cloud Model Studio
Mistral AI
Mistral AI Studio
Mistral Vibe
OpenClaw
Qwen
Qwen3.5-Plus

Integrations Supported

APIFree
Alibaba Cloud Model Studio
Mistral AI
Mistral AI Studio
Mistral Vibe
OpenClaw
Qwen
Qwen3.5-Plus

API Availability

Has API

API Availability

Has API

Pricing Information

Free
Free Trial Offered?
Free Version

Pricing Information

Free
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Alibaba

Date Founded

1999

Company Location

China

Company Website

qwen.ai

Company Facts

Organization Name

Mistral AI

Date Founded

2023

Company Location

France

Company Website

mistral.ai

Categories and Features

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