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What changed in the API, what failed during agent testing, and how to design tool-using systems that stay inside the rails.

Anthropic's randomized trial with 52 developers. But some interaction patterns beat hand-coding.

GPT-5.3-Codex debugged its own training. It also triggered OpenAI's first "High" cybersecurity rating.

Anthropic's new flagship outperforms GPT-5.2 by 144 Elo on knowledge work. Here's the technical breakdown.

285 billion in value erased. Thomson Reuters hit its largest single-day drop ever. Here is the full technical breakdown.