Blog summary:

Release summary for Qiskit SDK v2.4

Support for compiled Python extensions makes it possible to build and distribute high-performance tooling on top of Qiskit’s C API

Faster, more scalable fault-tolerant transpilation pipeline delivers lower T counts and improved performance for discrete-basis compilation workflows

Expanding C API capabilities and faster QPY serialization further strengthen Qiskit’s core infrastructure for large circuits and advanced compiler workflows