Planning the 2.38 release

Developers
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It’s that time again!

We’re coming up on 4 months post-2.37 release (September 2nd).

I’d like to propose the following dates for the 2.38 release:

  • Feature freeze on Monday, January 5th 2026
  • Release on Monday, January 12th 2026

As always, please use this thread if you have any thoughts on those dates, or if you need a pull request reviewed or think an issue is a high priority for this release.

cc @spinkney @stevebronder @charlesm93

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I have just two PRs of my own that I believe should be merged before the next release:

I am also tracking:

  • the new wiener lcdf functions (cc @Franzi) – I’d like to get those into the compiler before the next release, but they do still need to be renamed to lcdf_defective
  • the numerical improvements to the laplace approximations that would allow us to expose those functions

Edit: new ones

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I have the fix ready and need to push the pr for

Fix `gamma_lccdf` actually · Issue #3257 · stan-dev/math · GitHub
fix gamma lccdf for alpha > 30 and overflow by spinkney · Pull Request #3264 · stan-dev/math · GitHub

Maybe I can get to issue #3153 but no promises

numerical instability in beta_binomial_lpmf at large shape parameters · Issue #3153 · stan-dev/math · GitHub

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I just renamed all functions from wiener_lc(c)dfto wiener_lc(c)df_defective

This can be found in

issue #3256 https://github.com/stan-dev/math/issues/3256 and

PR #3258 https://github.com/stan-dev/math/pull/3258

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Because I didn’t do any prep for the RCs over the holidays, the freeze will be starting tomorrow rather than today

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