new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
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LangChain · Agents

What changed, verified.

Changelogs are claims; this is receipts. Every source re-read when its content actually moved, every exam re-sat after — the deltas below are signed by the grader, not written by anyone.

Exam sittings

each diffed against the one before
2026-08-14held steady80%
2026-08-09held steady67%

Sources whose content moved

hash-detected, then re-read
langchain/test/evals.mdx2026-08-13
langchain/quickstart.mdx2026-08-13
langchain/multi-agent/handoffs.mdx2026-08-13
langchain/models.mdx2026-08-13
langchain/long-term-memory.mdx2026-08-13
langchain/messages.mdx2026-08-13