I think you're misunderstanding. Astra is at the top of the official ARC-AGI leaderboard, with an ARC-AGI approved harness. It's not a harness specialized for ARC-AGI. It just does the same thing the regular ChatGPT interface does: keeps conversation history across turns and compacts when it gets too long. Without the harness, it loses its entire context window every move. That's not how humans work and it's not how any real AI service works.