Opus 4.7 Cost Impact Calculator

How much extra are Opus 4.7 bugs costing you? Calculate your hidden overhead.

Your Plan Daily usage (hours) Sessions per day Subagent spawns per session

Your Hidden Opus 4.7 Overhead

What's causing the overhead?

Opus 4.7 introduced multiple token inflation bugs that stack on top of each other:

+20K hidden tokens per session from server-side inflation (#46917, 196 reactions)
1.7x system token bloat — 21.5K→36.7K on session start (#49356)
~4.7K per subagent spawn without cache_control (#50213)
Cache destruction every turn via smoosh pipeline (#49585)
cache_read at full rate instead of 1/10 discount (#49302)

Full analysis: Opus 4.7 Survival Guide (30 issues, 47+ GitHub bugs tracked)