v2.38.0 (13 January 2026)

• Allow min:max indexing to always succeed if it is an empty selection. (#3362)

• Updated scalar templating in the serializer. (#3355)

• Removed the uses of forward_as from the stan repo and adds if constexpr where possible. (#3357)

• Updated Pathfinder writer to avoid indexing past vector length. (#3364)

Documentation

HTML

• Stan User's Guide 2.38
• Stan Language Reference Manual 2.38
• Stan Language Functions Reference 2.38

PDF

• Stan User's Guide 2.38 pdf
• Stan Language Reference Manual 2.38 pdf
• Stan Language Functions Reference 2.38 pdf