Codex tip: 1M context window setting silently kills cache and burns your quota
altryne · x · 2026-09-27
altryne shares a PSA for Codex users: an experimental setting setting the context window to 1M tokens breaks OpenAI's prompt cache and rips through your usage quota. After removing the setting and moving sub-agents to a cheaper model, usage went back to normal. Check your codex.toml for stale experimental settings.
Related event: Codex users warned: 1M context setting destroys cache and burns quota(3 posts)→
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