Prime Agent - a new coding harness surpassing Codex/CC/PI

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open-source coding-agent research-harness arc-agi token-efficient multi-agent

Summary

Prime Agent is an open-source coding and research harness that outperforms proprietary harnesses, scoring 95.5% on ARC-AGI-3 and improving models across benchmarks.

Prime Agent is an open-source coding and research agent for general and long-running work. 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. On ARC-AGI-3, it scores 95.5%, surpassing the human-expert baseline, but the gain is not benchmark-specific. We see major improvements across models when compared to their proprietary harnesses. Prime Agent is built on pi and fully open-source with an open license. GitHub: https://github.com/PrimeIntellect-ai/prime-agent Blog: https://www.primeintellect.ai/blog/prime-agent X post: https://x.com/primeintellect/status/2085086999267144083?s=46
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