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How Goodfire used Ai2’s open post-training stack to trace unwanted model behavior

This story is from 2026-09-09. It is preserved in the archive; the latest stories are on the live feed.

Goodfire used Ai2’s fully open post-training stack to predict LLM behavioral changes, trace unwanted model behavior back to individual training examples, and test targeted fixes without sacrificing broader capability gains.

Read the full story at Allen Institute for AI (Ai2) ↗

Timeline · 2 reports

  1. 2026-09-09 16:58 · r/machinelearningnews
    🧪 Goodfire used Ai2’s open stack to predict how preference training changes an LLM’s behavior
  2. 2026-09-09 08:00 · Allen Institute for AI (Ai2)
    How Goodfire used Ai2’s open post-training stack to trace unwanted model behavior

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