Lessons From 51 Anthropic and OpenAI Engineering Posts

• 20 min read

A synthesis of 51 posts, current as of August 2026, across Anthropic's engineering blog and OpenAI's developer blog: the ten themes both labs converge on—context budgets, verification, harness design, tool interfaces, skills, evals, containment, and the shift to long-horizon agents—with copy-paste prompts.

AI AgentsContext EngineeringEvalsAgent HarnessAI EngineeringClaude CodeCodexMCPLessons Learned

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