IFM releases K2 Horizon, six Apache-2.0 models published with intermediate checkpoints, training code and logs

Sources: primary, discussion
Summary: The release publishes six models under Apache 2.0 together with intermediate checkpoints, the training code, the mixture composition and per-stage training logs. That is the material a team needs to reproduce a training method rather than only to run a final checkpoint.
Why it matters: Most open-weight releases publish final weights alone, and this one publishes the training record beside them.
Follow-up: Track whether any group reproduces a K2 Horizon training stage from the published checkpoints and logs.