Analyzing GPT-6 Astra's performance on ARC-AGI has been one of the highlights of my career: With our standard harness - which lets models carry notes forward and is what we've historically used for apples-to-apples comparisons - Astra more than doubles the previous verified high score, reaching 62.7%. We also tested Astra with a new provider adapter harness, configured to preserve the model's opaque reasoning state between requests and use native compaction as the context window grows. With…