Ashton Chew
Member of Technical Staff at Amazon AGI Labs
Work
I research RL and infra at Amazon AGI Labs.
Previously, I was a Founding Engineer at Theta, researching RL environments and building RL infra for tool use/computer use agents, and a Machine Learning Engineer Intern at Amazon AGI on the inference team.
Research
Stubborn or Sycophantic? GEPA-Evolved Prompts Under Pressure
To appear in COLM 2026
WARP: A Wrapper-Based, Adaptive, Realistic Pipeline for Reliable Web-Agent Robustness Testing
ICML 2026