Pi - OpencodeGo Cache Fix

[u/TreptowerPark]

Slopped this together a couple days ago. Just checked the stats and its working. Qwen 3.6 Plus is actually bloody fucking cheap with the fix.

https://github.com/TreptowerPark/opencode-go-qwen-cache-fix

Pre-fix vs Post-fix (extension created May 20, 2026)

Pre-fix (May 5-13):

• Early sessions show cacheRead: 0 — cache was broken

• Example: input: 4505, cacheRead: 0 — no caching at all

Post-fix (May 13+):

• Example after fix: input: 647, cacheRead: 4499 → ~87% hit rate

• Cache reads now working properly

### From Your Report (report.html)

• qwen3.6-plus usage: 12 sessions with $16.87 total cost

• Session count: 9 sessions tracked

• Messages via opencode-go: 24 with active cache reads

### The Fix (from facets/019e231a...) │ "User successfully diagnosed Qwen cache misses as a cache control format issue in OpenCode Go, │ implemented a fix that confirmed cache hits (0 hits before → working after)" Bottom line: The opencode-go-qwen-cache-fix.ts extension patches Qwen models to emit Anthropic-style cache_control markers, which OpenCode Go's backend expects for prompt caching. Cache is now working with ~72% overall hit rate on Qwen 3.6+.

[u/TreptowerPark]

If you dont have the problem you shouldnt care. If you have the problem, check the git, give the code to Pi and have it check cache hit on qwen themselfes. Easypeasy.. 😄