Axion 1.0: Open Agent Foundation Models, Simplified

Axion 1.0, a fully open agent foundation model, was released with a training recipe of only three stages: two lightweight supervised fine-tuning stages followed by reinforcement learning, with no dedicated midtraining stage. The release claims strong and broad agentic capabilities from that simplified pipeline.

We introduce Axion 1.0, a fully open agent foundation model that combines strong and broad agentic capabilities with a remarkably simple training recipe. Axion 1.0 is trained in only three stages: two lightweight supervised fine-tuning stages followed by reinforcement learning, without dedicated mid