Tier 2 Restricted open-weight
What the publisher claims: open, open-source
The one-liner: Same family, three different licences - Apache 2.0, CC-BY-NC and a branded Apache derivative.
The six questions
weights downloadable
licences differ per checkpoint and include non-commercial and branding terms
standard tooling
model cards and evals only
Limited to moderate.
Upstage's Solar weights appear on Hugging Face with model cards and evaluation summaries and no public development repository or roadmap, so outside developers can request changes but cannot contribute to the model.
License
Mixed across releases - Apache 2.0 for SOLAR-10.7B-v1.0 base; CC-BY-NC 4.0 for SOLAR-10.7B-Instruct-v1.0; custom Upstage Solar Licence (Apache 2.0 derived with a branding condition) for Solar-Open and Solar-Open2 — license source ↗
- licence changes between checkpoints
- the Upstage Solar Licence permits commercial use but requires derivative models to be named Solar and to display Built with Solar
What is actually released
- weights
- model cards
- evaluation information
- blog and paper; no training data
Why it matters
Retained as an entry with the explicit caveat that Upstage openness must be checked at the exact checkpoint and licence level.
Sources
- https://huggingface.co/upstage/SOLAR-10.7B-Instruct-v1.0
- https://huggingface.co/upstage/Solar-Open2-250B/raw/main/LICENSE
- https://huggingface.co/api/models?author=upstage
Derived from the openness dataset behind But Is It Open? — snapshot 2026-11-07 ↗. Scores are qualitative readings of the cited evidence, not verdicts; tier measures openness, not intelligence.