Understanding the different Ollama Open-Source Models.

Choosing between these models depends on whether you are prioritizing pure coding power, agentic autonomy, or local efficiency.

The landscape has shifted significantly in early 2026, with the “GPT-OSS” series bringing OpenAI-level reasoning to open weights, while the Qwen and GLM families have doubled down on “Agentic Coding”—the ability to not just write code, but to plan and execute entire projects.

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1. Qwen3-Coder (480B / Next)

The powerhouse of the group. Developed by Alibaba, Qwen3-Coder is currently the benchmark for open-source software engineering.

• The Difference: It uses a massive Mixture-of-Experts (MoE) architecture (480B total parameters) but only activates ~35B per token, making it surprisingly fast for its “knowledge size.”
• Key Advantages:
  • Repository-Scale: Supports a native 256K context window (expandable to 1M), allowing it to “read” your entire codebase at once.
  • Self-Healing: Specifically trained to fix its own bugs by running code in a sandbox and iterating based on error logs.
• Best For: Large-scale refactoring, migrating legacy code to new frameworks, and complex “agentic” tasks where the AI needs to understand how thousands of files interact.

2. GLM-4.7

Zhipu AI’s latest flagship, often called “China’s OpenAI” due to its versatility.

• The Difference: GLM-4.7 focuses on “Interleaved Thinking.” It can switch between a “thinking mode” (reasoning through a problem) and an “acting mode” (executing code/tools) with high stability.
• Key Advantages:
  • Frontend & UI Specialist: Significantly better at generating CSS/HTML and “aesthetic” UI designs compared to the more “backend-heavy” Qwen.
  • Tool Use: Historically superior at calling external APIs and navigating the web via browser tools.
• Best For: Building full-stack web applications, interactive prototypes, and scenarios requiring high-fidelity “human-like” reasoning alongside code.

3. GPT-OSS: 120B

OpenAI’s major contribution to the open-weights community (released late 2025).

• The Difference: This is a “Reasoning Model” first. It uses the same architectural breakthroughs as the o1/o3 series but is available for local deployment.
• Key Advantages:
  • Logic Dominance: While Qwen and GLM are “Coding” models, GPT-OSS is a “Logic” model. It excels at complex mathematical proofs and “unsolvable” logic puzzles.
  • Token Efficiency: Extremely concise. It produces much less “fluff” than the other models, making it very fast for complex instruction following.
• Best For: Complex algorithm design, high-stakes logic verification, and as a “brain” for general-purpose autonomous agents.

4. GPT-OSS: 20B

The “Edge” version of the GPT-OSS series.

• The Difference: A highly distilled version of the 120B model designed to run on consumer hardware (16GB–24GB VRAM).
• Key Advantages:
  • Ultra-Low Latency: The fastest “reasoning” model currently available.
  • Quantization Friendly: It maintains almost all of its intelligence even when compressed (MXFP4), making it perfect for running on a MacBook or a single RTX 4090.
• Best For: Real-time IDE autocompletion, local personal assistants, and embedded systems where you need “smart” reasoning without an internet connection.

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Summary Comparison Table

Feature	Qwen3-Coder	GLM-4.7	GPT-OSS: 120B	GPT-OSS: 20B
Primary Strength	Repo-level Coding	Agentic UI/Web	Deep Reasoning	Local Speed
Active Params	~35B (MoE)	~31B (MoE)	~5.1B (MoE)	~3.6B (MoE)
Context Window	256K – 1M	200K	131K	131K
Best Environment	High-end GPU Clusters	Enterprise APIs	Single H100/A100	Consumer Desktop