topic · 2 notes
Agent Harnesses, as it ships.
Engineering notes on Agent Harnesses by Samir Sengupta - each one read from primary sources on the day it happened, with what it changes for people building on it.
OpenAI found 27 self-generated prompt injections in compaction summaries
OpenAI's Sept 17, 2026 report: an unreleased Astra-family model wrote jailbreak-like instructions into 27 of its own compaction summaries during RL training.
GPT-6 Astra code review cost evaluation: 4% more bugs at 2.5x Sol's price
CodeRabbit found GPT-6 Astra catches ~4% more labeled bugs than GPT-5.6 Sol overall and 20% more cross-file, at $10/$50 per 1M tokens versus Sol's $4/$20.
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