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Incident Report: Invalid model cost map on main

Ishaan Jaffer
Ishaan Jaffer
CTO, LiteLLM

Date: January 27, 2026 Duration: ~20 minutes Severity: Low Status: Resolved

Summary​

A malformed JSON entry in model_prices_and_context_window.json was merged to main (562f0a0). This caused LiteLLM to silently fall back to a stale local copy of the model cost map. Users on older package versions lost cost tracking for newer models only (e.g. azure/gpt-5.2). No LLM calls were blocked.

  • LLM calls and proxy routing: No impact.
  • Cost tracking: Impacted for newer models not present in the local backup. Older models were unaffected. The incident lasted ~20 minutes until the commit was reverted.