What’s New in Go 1.26? Language, Performance, and Tool Updates

Go 1.26 has been released, bringing several language, runtime, compiler, and tooling enhancements.

Language changes

The release adds two major language improvements. First, the built‑in new function can now be used directly in expressions to create a variable with an initial value. For example:

x := int64(300)
ptr := &x

can be simplified to:

ptr := new(int64(300))

Second, generic types can now refer to themselves in their own type‑parameter list, simplifying the implementation of complex data structures and interfaces.

Performance improvements

The experimental “green tea” garbage collector is now enabled by default.

Baseline CGO overhead is reduced by roughly 30%.

The compiler can now allocate support storage in more cases, allowing stack slicing and improving performance.

Tool improvements

The go fix command has been completely rewritten using the Go analysis framework. It now includes dozens of modernizers and analyzers that suggest safe fixes, help code adopt new language features, and integrate with the standard library. It also provides an online analyzer that attempts to inline all calls to each annotated function. See the upcoming blog posts for details.

Additional changes

Go 1.26 adds three new standard packages: crypto/hpke, crypto/mlkem/mlkemtest, and testing/cryptotest. The GODEBUG environment variable has been updated with new options.

Experimental packages

simd/archsimd

– provides SIMD (“single instruction, multiple data”) operations. runtime/secret – offers secure erasure of temporary files used by secret‑handling code. runtime/pprof (goroutine leak configuration) – reports leaked goroutines.

These experimental features are opt‑in and may become stable in future Go releases. The full list of changes is available in the official Go 1.26 release notes.