Dissecting model behavior through agent trajectories

In three linesStudy of harness-model alignment via 138k agent trajectories. Authors introduce Simple Strands Agent (SSA), a generic harness tested on Claude, Gemini, GPT, Grok, Qwen across SWE-Pro, SWE-Verified, and Terminal-Bench-2. Beyond pass@1 scores, analysis reveals fine-grained behavioral differences: edit frequency, testing activity, phase transitions.

Summary generated by Claude — human-verified