Qwen3, Qwen2, and Qwen1.5 are each in different versions and have evolved in terms of performance and functionality. Below we will summarize the main differences:

1. Number of parameters and model size

• Qwen1.5: Designed as a foundation model with medium-sized parameters (e.g. 10-70 billion).
• Qwen2: The number of parameters has increased dramatically, and larger models (e.g. 100 billion to 1 trillion) have been adopted, improving the ability to respond to complex tasks.
• Qwen3: Utilizing the latest technology, further expanding the number of parameters. Larger models (e.g. over 1 trillion) provide broader knowledge and deeper understanding.

2. Update your learning data

• Qwen1.5: Learning based on data up to 2023.
• Qwen2: Add the latest data up to 2024 and update it with the latest knowledge and information.
• Qwen3: 2, and also reflect the latest data up to 2025. Process the latest trends and information more accurately.

3. Performance and Function Improvements

• Qwen1.5: Specializes in basic conversations, question answering, and writing generation.
• Qwen2:
  • Improve your logic and reasoning ability (e.g., solution to mathematical problems, logical reasoning).
  • Expanded multilingual support (English, Chinese, Japanese, etc.).
  • Added code generation and execution functions (e.g., creating and running Python code).
• Qwen3:
  • A higher inference ability (e.g., solution to difficult problems, analysis of complex logical structures).
  • Multi-modal support (supports not only text but also image and audio processing).
  • Improved real-time response speed (efficiently handle large-scale tasks).
  • Improved security and privacy protection (additional mechanisms to handle user data safely).

4. Differences in target usage

• Qwen1.5: As a foundational AI assistant, perfect for everyday conversations and information searches.
• Qwen2:
  • For developers (code generation, API design, etc.).
  • Teaching and Learning (Explanation of complex concepts and problem solving).
  • Business use (e.g. creation of materials, planning marketing strategies, etc.).
• Qwen3:
  • Advanced research and development (scientific reasoning, hypothesis verification, etc.).
  • For large enterprises (large data processing, AI systems design).
  • Multi-Linguistic and Multicultural Project (International Collaboration and Translation Support).

5. Characteristic New Features

• Qwen3 has new features such as:
  • Real-time Information Search (automatically retrieve the latest news and data).
  • "Multimodal generation" (creation with a combination of text and images).
  • Error check and correction function (automatically correct user input errors).
  • Privacy Mode (configuration option that restricts the output of certain information).

Summary: Version to choose

| Version | Optimal Use | Features | |----|----| | Qwen1.5 | Daily Conversation and Information Search | Fundamental Models, Simple Response | | Qwen2 | Development, Education, Business | Multilingual Code Generation, Logic Inference | | Qwen3 | Research, large-scale projects, international collaboration | Multimodal support, latest technology support |

Note

• Qwen3 is the latest version, but may require more resources (computational power and memory).
• When choosing the best version for your particular application, consider the performance requirements, processing speed, and cost.