Lionel Arce

LionelArce

Research and software engineering, self-improving AI agents and training language models.

Software & research engineerBuenos Aires

Work

seri 

2026

A cross-platform coding-agent harness, open source, built from scratch.

Chainforge 

2026

A Go framework for agents. The core has no external dependencies, and it speaks MCP.

GRPO

2026

Post-training a 1.7B model with GRPO on GSM8K. Accuracy moved from 66.9% to 87.3%.

Papers

Most Self-Improving LLM-Agent Papers Fail Two or More Evaluation Traps 

2026

39 of 41 papers fail two or more known eval traps.

The Plurality Paradox 

2026

When disagreement between providers stops working as an alarm.

The Plausibility Trap 

2026

Past a reviewer's frontier, plausibility can make acceptance favor false claims. A pre-registered test did not find that reversal.

Lab notesRead the notes from the lab