OpenAI: gpt-oss-20b
Analysis Summary
OpenAI: gpt-oss-20b sits in the Specialist tier on our leaderboard, ranked #132 of 525 published models on overall intelligence. At $0.030 input and $0.140 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 delivers strong instruction following (ifbench 0.578) and livecodebench (0.652) at just $0.03 input with tool use; a cost-effective option for structured content and SEO tasks from OpenAI.
Assessed April 26, 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
Content
Benchmark data from Artificial Analysis and Hugging Face
How does OpenAI: gpt-oss-20b stack up?
Compare side-by-side with other specialist models.
Model Information
| OpenRouter ID |
openai/gpt-oss-20b
|
| Provider | openai |
| Release Date | August 5, 2025 |
| Context Length | 131,072 tokens |
| Max Completion | 131,072 tokens |
| Status | Active |
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $0.03 | $0.000030 |
| Output | $0.14 | $0.000140 |
Live Performance
Live endpoint metrics — refreshed every 30 minutes.
