Codex tip: sidechat busts your prompt cache and eats usage limits fast
brandon_galang · x · 2026-10-05
A developer reports a practical gotcha with Codex's sidechat feature: it busts the prompt cache, invalidating the context you've already accumulated. The advice: use sidechat with caution when deep into your context window, as it will eat up your usage limits quickly. Others in the thread question the feature's design entirely.
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