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 lower-latency inference and deplo…
Model details →OpenAI: gpt-oss-20b vs Body Builder (beta)
OpenAI: gpt-oss-20b wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
Transform your natural language requests into structured OpenRouter API request objects. Describe what you want to accomplish with AI models, and Body Builder will construct the appropriate API calls. Example: "count to 10 using gemini and …
Model details →Side-by-side comparison
| Capability | OpenAI: gpt-oss-20b | Body Builder (beta) | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 131K | 128K | 🏆 OpenAI: gpt-oss-20b |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.03 | $-1000000.00 | 🏆 Body Builder (beta) |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $0.11 | $-1000000.00 | 🏆 Body Builder (beta) |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | — | 🏆 OpenAI: gpt-oss-20b |
| Vision input Accepts image inputs alongside text. | — | — | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | — | 🏆 OpenAI: gpt-oss-20b |
Frequently asked questions
Is OpenAI: gpt-oss-20b better than Body Builder (beta)?
OpenAI: gpt-oss-20b wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between OpenAI: gpt-oss-20b and Body Builder (beta)?
Input: $0.03 vs $-1000000.00 per 1M tokens. Output: $0.11 vs $-1000000.00 per 1M tokens.
What context windows do OpenAI: gpt-oss-20b and Body Builder (beta) support?
OpenAI: gpt-oss-20b supports up to 131K tokens. Body Builder (beta) supports up to 128K tokens.
Do both OpenAI: gpt-oss-20b and Body Builder (beta) support tool calling?
OpenAI: gpt-oss-20b: yes. Body Builder (beta): not advertised.