Claude Fable 5.1 & GPT-6 Astra packages are live

go-performance

Performance

Making Go fast with evidence — pprof first, allocations and escape analysis, preallocation, strings.Builder, sync.Pool where it pays, GC tuning…

Choose your model

Available for 11 model families. The engineering substance is the same in each; the structure, checklist phrasing and constraint ordering are tuned per family.