OpenAI: gpt-oss-20b (free)
OpenAIgpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-
Text
Specifications
| Vendor | OpenAI |
| Family | openai |
| Context | 131.1K · 98.3k words（≈ a thesis） |
| Max output | 131.1K · 98.3k words（≈ a thesis） |
| Released | 2026-06-19 |
| Open source | No |
| Tool use | — |
Pricing across channels
per 1M tokens, USD
| Channel | Type | Input | Output | → |
|---|---|---|---|---|
| OpenRouter (auto) | Aggregator | $0 | $0 | visitAd |
OpenRouter API (auto-fetched)· 2026-06-19
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