Codex Tip: Switching reasoning levels invalidates context cache
mark_k · x · 2026-08-17
If you frequently switch reasoning levels (e.g., between "Medium" and "High") while working with Codex, reconsider. Changing levels invalidates the context cache, forcing a regeneration of the entire context window and costing significantly more tokens.
Related event: Frequent Codex Reasoning-Level Switching Kills Context Cache(2 posts)→
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