OpenAI: gpt-oss-20b (free)
Analysis Summary
OpenAI: gpt-oss-20b (free) sits in the Efficient tier on our leaderboard, ranked #225 of 544 published models on overall intelligence. At $0.000 input and $0.000 output per 1M tokens, it is among the most expensive on the market. It offers a standard large context window and supports tool use, function calling, and reasoning.
Editorial notes
GPT-OSS-20B (free) from OpenAI is available at no cost with a 24.5 intelligence index, strong livecodebench (0.777), and tool use support; an excellent value entry point for lighter business tasks despite modest coding and agentic scores.
Assessed May 5, 2026
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
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
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.
