gpt-oss-20b
by OpenAI
· GPT Oss family · released Aug 5, 2025
Open weights
Active
Fully local open-weight GPT.
This model has no first-party API. Open-weight release: self-host from published weights.
Specifications
| Model type | Multimodal |
|---|---|
| Architecture | MoE |
| Parameters | 21 (3.6 active) |
| Context window | 131.1K tokens |
| Max output | 32.8K tokens |
| Knowledge cutoff | Oct 1, 2024 |
| License | Apache License 2.0 |
| Modalities | Text input Image input Text output |
| Tags | Reasoning Small LM |
| End of life | Not disclosed |
| Last verified | Aug 20, 2026 |