Side-by-side comparison of GPT-OSS 120b (OpenAI · USA) and Step-3.7-Flash (StepFun) for self-hosted deployment of the open-weight model. GPT-OSS 120b is rated EU-ready; Step-3.7-Flash is conditional. They part ways on commercial use: GPT-OSS 120b is "Yes", Step-3.7-Flash is "Unrestricted".
| Field | ||
|---|---|---|
| Summary | ||
| Verdict | EU-ready OpenAI's first major open-weights release. Apache 2.0, MoE with 5.1B active over 117B total, MXFP4 quantised to fit a single 80GB GPU. Historic shift for a vendor that built its brand on closed weights. | Conditional Per the published Apache 2.0 LICENSE, the Step-3.7-Flash weights ship without commercial restriction — a 198B / 11B-active vision-language MoE with a 256k-token context aimed at tool-heavy and agentic workflows. The remaining EU-readiness gaps are the entirely undisclosed training corpus and StepFun's Shanghai-based vendor jurisdiction; deploy on self-managed EU infrastructure and document the Art. 50 transparency story for any synthetic or biometric output. |
| Last reviewed | 2026-04-15 | 2026-05-30 |
| Open-weight | ||
| Licence | Apache 2.0 | Apache 2.0 |
| Commercial use | Yes | Unrestricted |
| Training data | Undisclosed | Undisclosed |
| Origin | USA | China (Shanghai) |
| Performance & pricing? | ||
| Quality index | 33/100 | — |
| Speed | 212 tok/s | — |
| Blended price | $0.26/M | — |
| Context window | — | — |
| Evidence | ||
| Sources | ||
No overlapping sources between the two entries.