OpenAI: gpt-oss-20b (free)
Analysis Summary
OpenAI: gpt-oss-20b (free) sits in the Professional tier on our leaderboard, ranked #10 of 565 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
OpenAI gpt-oss-20b (free) delivers strong math and coding benchmarks at no cost with tool use and function calling from OpenAI; agentic index is absent and intelligence scores are mid-tier, but the free pricing makes it exceptional value.
Assessed May 31, 2026
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
How OpenAI: gpt-oss-20b (free) compares
OpenAI: gpt-oss-20b (free) ranks #145 of 370 AI models we track for overall intelligence, #148 of 307 for coding. Its 131K-token context window is larger than 60% of the models we list. OpenAI: gpt-oss-20b (free) is currently free to use via OpenRouter.
About OpenAI: gpt-oss-20b (free)
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 professional 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.
Leaderboard Categories
External Resources
Frequently asked questions about OpenAI: gpt-oss-20b (free)
How much does OpenAI: gpt-oss-20b (free) cost?
OpenAI: gpt-oss-20b (free) is currently available for free via OpenRouter.
What is the context window of OpenAI: gpt-oss-20b (free)?
OpenAI: gpt-oss-20b (free) has a context window of 131,072 tokens (131K).
Is OpenAI: gpt-oss-20b (free) good for coding?
On our coding benchmark index, OpenAI: gpt-oss-20b (free) ranks #148 of 307 models, placing it in the broader range of the field for code generation and debugging.
What can OpenAI: gpt-oss-20b (free) do?
OpenAI: gpt-oss-20b (free) supports tool use and function calling.
Who created OpenAI: gpt-oss-20b (free)?
OpenAI: gpt-oss-20b (free) is developed by OpenAI and was released on August 5, 2025.
