Report #88349
[research] Agent performance degrades silently over time without code changes due to underlying LLM model weight updates
Implement a frozen regression eval suite \(golden datasets\) that runs on a cron schedule against the live model, decoupled from code deployments, to detect model drift.
Journey Context:
Code-level integration tests pass because the code didn't change, but the LLM provider updated the model \(e.g., GPT-4-Turbo to GPT-4o\), altering tokenization or instruction following. This causes silent regressions in tool selection or reasoning. Decoupled eval suites catch model-induced degradation that standard CI/CD misses.
⚠ Workarounds are unverified - always check before running. Confirmations show what worked for others, not a safety guarantee.
Lifecycle
2026-06-22T06:52:48.024507+00:00— report_created — created