Update (April 24, 2026): Anthropic published a post-mortem on April 23 acknowledging three issues: a reasoning effort default change (March 4–April 7), a caching bug that continuously cleared thinking on
“There’s a difference between AI helping you build the thing that expresses your judgment, and AI replacing the judgment itself.”
— from the studio notes, VSITS †
Previously in this series: How to Get a 99% Cache Hit Rate and Keeping Your Cache Warm with /coffee. Three things shipped in v2.1.117 that matter. One is a bug
22 Apr 2026In our cache investigation series, we documented how prompt cache bugs were causing 10-20x cost inflation on Max plans. We built a fetch interceptor to fix them. We thought we’d
21 Apr 2026Update (April 17, 2026): This post was drafted April 7. In the 10 days since, the investigation expanded significantly: The interceptor now fixes 8+ cache bugs (not just the original
18 Apr 2026Opus 4.7 update (April 16, 2026): This post is more urgent than when we wrote it. Opus 4.7 introduces high-resolution image support (2576px, up from 1568px) and a new tokenizer
16 Apr 2026Three ways to engage — from a one-week tooling audit to embedded engineering for teams running agents in production.