UltraData 2609 release (Code, RL, SFT-Agent)

OpenBMB's September 2026 UltraData drop, released alongside MiniCPM5-2B, whose pretraining corpus it feeds. The public drop is the L2 tier, split by language (C++, C#, Go, Java, JavaScript, PHP, Python and more) as parquet shards, together with the L2 quality classifier used to build it. It follows Ultra-FineWeb-L3 as the second tier-labelled UltraData release; the technical report is marked "coming soon." The same week added UltraData-RL-2609, 85,995 verifiable RL problems (math 32.4K, code 23.7K, long-context 18.0K, knowledge 11.9K) on which JustRL II was run, and UltraData-SFT-Agent-2609, 483,661 agent trajectories across code, search, general, and tool-use agents; the pipeline itself is described in the tiered data-management paper (arXiv 2602.09003). Apache 2.0.