IDEAS, DECISIONS & LESSONS

Journal

Notes on AI, architecture and building useful products.

155 articles

06 Aug 2026 · 6 min read

ai-cost

GPT-5.6 Luna at 80% Off: The New Model Economics for AI Products

OpenAI just cut GPT-5.6 Luna pricing by 80% and Terra by 20%. Combined with 15% better token efficiency from speculative decoding, the cost math for AI products has fundamentally shifted. Here's how to rethink your model routing strategy and capture the savings without sacrificing quality where it matters.

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31 Jul 2026 · 7 min read

ai-agents

Claude Opus 5 and the Shift to Agentic Engineering

Claude Opus 5 isn't just a better model — it changes the economics and architecture of AI agent systems. What the benchmarks actually mean for teams building production pipelines: configurable effort, self-verification, and the 'chief-of-staff' pattern.

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