MongoDB - Build AI That Scales
Mini toolsXBai o4
By MetaStone AI
The project describes a “reflective generative” training form that combines long chain-of-thought reinforcement learning with process reward learning, aiming to improve deep reasoning and trajectory selection, with a dated “We release XBai o4” entry in the project news.
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Gen 3
Overview
XBai-o4 is an open large language model focused on test-time scaling and reflective reasoning improvements.
Tools using XBai o4
No tools found for this model yet.
Last updated: February 25, 2026
