OpenAI: Gpt-oss-20b (free)
Free OpenAI Reasoning Power
Run Efficiently. Reason Deeply.
MoE Architecture
20B Parameters Active 3.6B
Activates 3.6B parameters per token from 21B total for fast inference on 16GB VRAM.
Configurable Reasoning
Low Medium High Effort
Set reasoning level in system prompt to balance speed and depth for any task.
Agentic Native
Tool Calling Built-In
Handles function calling, code execution, and structured outputs without extras.
Examples
See what OpenAI: Gpt-oss-20b (free) can create
Copy any prompt below and try it yourself in the playground.
Code Debug
“Reasoning: high. Analyze this Python function for bugs and suggest fixes: def factorial(n): if n == 0: return 1 else: return n * factorial(n+1)”
Math Proof
“Reasoning: medium. Prove that the sum of angles in a triangle is 180 degrees using Euclidean geometry.”
Agent Workflow
“Reasoning: high. Plan steps to research quantum computing basics, execute Python simulation of qubit, output results in table.”
Text Summary
“Reasoning: low. Summarize key advances in MoE architectures from recent AI papers in 3 bullet points.”
For Developers
A few lines of code.
Reasoning LLM. One Prompt.
ModelsLab handles the infrastructure: fast inference, auto-scaling, and a developer-friendly API. No GPU management needed.
- Serverless: scales to zero, scales to millions
- Pay per token, no minimums
- Python and JavaScript SDKs, plus REST API
import requestsresponse = requests.post("https://modelslab.com/api/v7/llm/chat/completions",json={"key": "YOUR_API_KEY","prompt": "","model_id": ""})print(response.json())
Ready to create?
Start generating with OpenAI: Gpt-oss-20b (free) on ModelsLab.