Go 1.25/1.26

As of: 2026-02

The two releases

Go 1.25 (Aug 2025):

• Container-aware GOMAXPROCS — respects cgroup CPU limits by default; the end of manually setting GOMAXPROCS in Kubernetes (huge for tail latency).
• Modern crypto defaults — crypto/mlkem (post-quantum KEM), Ed25519ph, crypto/tls QUIC APIs; X25519MLKEM768 hybrid enabled by default in TLS.
• Testing:testing/synctest stable (deterministic concurrency tests), T.Outcome for cleanup logic.
• GC: still occasional-mode era; runtime telemetry.

Go 1.26 (Feb 2026):

• Language refinements shipped after the experiment cycle (the "major language enhancements" release — check the release notes for the final set: enum-era and generics ergonomics work landed here).
• Green GC default — the high-performance GC mode became default; big heaps pause less.
• Toolchain telemetry opt-out clarity, compile speed work.

Advice

Bump services to 1.25+ for the TLS PQ hybrid + GOMAXPROCS alone. 1.26's language changes are additive; run go vet on the new version before adopting repo-wide.