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XBai o4

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.
New Text Gen 3
Released: August 1, 2025

Overview

XBai-o4 is an open large language model focused on test-time scaling and reflective reasoning improvements.

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Tools using XBai o4

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Last updated: February 25, 2026
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