Upstage Releases Solar Open 2, Matching DeepSeek-V4-Flash Performance

Upstage has released "Solar open2", a new open-weights large language model that demonstrates competitive performance with DeepSeek-V4-Flash. The model shows strong capabilities across advanced benchmarks in reasoning, coding, and agentic tasks. This release strengthens the open-weights AI ecosystem by providing a highly capable alternative to proprietary and leading open models in complex reasoning and software engineering. It highlights the rapid progress of open-source models in matching state-of-the-art performance on specialized benchmarks. Solar Open 2 (250B-A15B) achieved a score of 86.3 on GPQA-Diamond and 70.4% on SWE-Bench Verified, closely trailing DeepSeek-V4-Flash's scores of 88.9 and 73.8% respectively. Additionally, it matched DeepSeek-V4-Flash on the MCP-Atlas tool-use benchmark with a score of 58.2.