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On Opus 5.5, a short prompt sent to a session idle for over an hour can cost up to 40x more, because Claude’s prompt cache has expired and the whole context gets reprocessed. Long break mid-session: would you ping it to keep the cache or compact first?
Anthropic cut over 80% of Claude Code’s system prompt for Claude Opus 5 and Claude Fable 5, and its coding evaluations showed no measurable loss. Has trimming your CLAUDE.md ever made Claude Code work better for you?
“Happy to dig further if useful” is one of the habits Terse, a Claude Code plugin, strips out. On the same 20 prompts, it cut Opus 5.5 from 9,705 words to 4,468, at 32% lower cost.
