Model releaseHigh global significanceConfirmed confidence
Upstage releases the open-weight Solar Open 2
Upstage releases Solar Open 2 on July 22, 2026, together with model weights, a technical report and deployment guidance.
What happened
Event details
Solar Open 2 is a 250B-A15B text-generation MoE model with a context window of up to one million tokens. Its official model card includes local deployment and text-generation examples.
Assessment
Why it matters
With 250B total parameters, 15B active parameters and a one-million-token context window, the model targets long-horizon agent tasks and includes public weights and deployment materials. Naming, attribution and notification requirements for derivatives limit its degree of openness.
83/100Global significance score. Regional effects are recorded only when the evidence supports a meaningful difference.
Availability
Access notes
The model weights are public. Commercial use and derivative models are governed by the Upstage Solar License.