Upstage Launches Solar Mini 4 and Solar Decide on OpenRouter

Key Info

Upstage's Solar Mini 4 and Solar Decide are now live on OpenRouter at 50% off for a limited time, with Solar Decide outperforming Jev 1.13 on both accuracy and latency on JevBench.

Highlights

• Solar Mini 4 is a 35B mixture-of-experts model with only 3B active parameters and a 524K context window, built for fast, low-cost agentic work
• It supports tool calling, structured outputs, and optional reasoning, priced at $0.05/M input and $0.20/M output
• Solar Decide is built on Solar Mini 4 and runs on OpenRouter's Decisions API, returning structured decisions instead of free text
• Solar Decide pricing: $0.10/M input and $0 output
• On JevBench, solar-decide beats Jev 1.13 on both axes: 87.0% vs 86.1% accuracy, and 0.14s vs 0.30s median latency