Composer 2.5 was 6.5x cheaper on 50 real Rust and Go PRs. Here's where it's actually safe.

Composer 2.5 vs Opus 4.8, GPT-5.5 and Opus 4.7 on 50 real merged PRs from sqlparser-rs (Rust) and graphql-go-tools (Go). Composer is 6.5-7x cheaper and ties the test gate, but finishes last on craft in both repos. A routing guide for where it's safe.