Notch kept its Claude Agent SDK harness and routed it to GPT-5.6 Luna through a LiteLLM proxy, cutting median harness cost per completed session from $4.44 to $0.50. The more transferable finding: models that passed the same evals still made different creative choices from the same brief, and a tool schema built on nested union types needed rewriting before the new model could use it reliably.
In the News: September 18, 2026
Anthropic reports how much of its own AI research Claude now leads and how it oversees 30,000 research and engineering agents.
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Claude leads 26 percent of Anthropic's AI R&D work
Anthropic built an internal index that rates every category of its AI research and development work on a six-level automation scale from Epoch AI, running from no AI involvement (AL0) to full autonomy with no human in the loop (AL5). As…
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Notch, an AI video-ad startup, August 18, 2026, resurfaced on Hacker News today