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Codex Swapped Its Default Model and Retired GPT-5.5 in 15 Days. Did Your Evals Notice?

This story is from 2026-10-18. It is preserved in the archive; the latest stories are on the live feed.

Book: Observability for LLM Applications Also by me: Thinking in Go (2-book series) — Complete Guide to Go Programming + Hexagonal Architecture in Go My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding tools Me: xgabriel.com | GitHub On September 29…

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  1. 2026-10-18 02:01 · DEV Community — AI
    Codex Swapped Its Default Model and Retired GPT-5.5 in 15 Days. Did Your Evals Notice?

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