Prime intellect introduced Prime Agent a self-improving RLM harness for coding and long-running autonomous tasks.

Designed to be both token-efficient and expressive through programmatic tool calling, context as a variable, multi-agent messaging, and a self-modifiable harness state.

Prime Agent is a general-purpose coding harness

On ARC-AGI-3, it scores 95.5%, surpassing the human-expert baseline, but the gain is not benchmark-specific.

Prime Agent combines three ideas:

1. Recursive Language Models-native programmatic tool calling
2. Persistent multi-agent orchestration
3. A self-improving Continual Harness

Together, they let the model act on its own context and harness.

Prime Agent is built on pi and fully open-source with an open license.