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This article is part of China AI Arbitrage — tracking the best deals, pricing hacks, and arbitrage plays on Chinese AI APIs.📅 Last updated: 2026-07-27
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Claude Opus 5 System Prompt Leak: Inside the 203KB Constitution
Claude Opus 5's 203KB system prompt leaked. 70%+ is tools, legal, and product catalog. The real surprise: a 800-line memory OS, Mythos tier above Opus, and Fable 5's silent routing to Opus. Full breakdown with 4.7 vs 5 comparison.