See the main page at https://github.com/CLASS-SZ and our evolving documentation.

A pure-JAX, pip-installable implementation of the tSZ power spectrum $C_\ell^{yy}$ (halo model, Arnaud et al. 2010 pressure profile), JIT-compiled and differentiable with jax.grad, is available in classy_szlite (pip install classy-szlite, documentation). It uses the same CosmoPower emulators for the CMB power spectra, the matter power spectrum and distances.