OpenAI: gpt-oss-20b (free)
The free tier of OpenAI's gpt-oss-20b offers reasonable accessibility at no cost, with tool use and function calling included, but its intelligence and coding scores are modest. It suits lightweight experimentation rather than demanding business workloads.
Assessment date: April 16, 2026
Our methodology takes into account a range of factors including pricing, functionality, capabilities, benchmark performance, and real-world applicability. Rankings are reviewed and updated regularly as new models are released. Issues with our rankings? Contact us
Performance Profile
gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimized for..
Capabilities
Architecture
| Modality | Text → Text |
| Tokenizer | GPT |
| Parameters | 20B |
Performance Indices
Source: Artificial Analysis
Benchmark Scores
Intelligence
Technical
Benchmark data from Artificial Analysis and Hugging Face
How does OpenAI: gpt-oss-20b (free) stack up?
Compare side-by-side with other efficient models.
Model Information
| OpenRouter ID |
openai/gpt-oss-20b:free
|
| Provider | openai |
| Release Date | August 5, 2025 |
| Context Length | 131,072 tokens |
| Max Completion | 8,192 tokens |
| Status | Active |
Live Performance
Live endpoint metrics — refreshed every 30 minutes.
