v2.38.0 (13 January 2026)

• Removed STAN_CPP_OPTIMS from the model info command. It was never set to the correct value. (#1332)

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v2.38.0-rc1 (6 January 2026)

release/v2.38.0: updating version numbers (#1334)

v2.37.0 (2 September 2025)

• Changed the default value of sig_figs to 8. This should reduce errors when using the output of CmdStan as further input to Stan programs. (#1308)
• Updated the behavior of filename arguments when requesting multiple chains. In addition to the existing behavior, users can now pass a comma-separated list of filenames to specify the output files for each chain. This allows for more flexibility in naming output files when running multiple chains. (#1312, #1318)
• Added more information when encountering a system error like an unwriteable file or a full disk. (#1316)
• Improved dependency discovery when running CmdStan's test suite. (#1314)
• Removed the mips64el build of CmdStan. (#1319)
• Re-added ESS/s to stansummary. (#1320)
• Fixed an issue with the diagnose command using the wrong number of iterations when calculating percentages. (#1321)

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v2.37.0-rc4 (22 August 2025)

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v2.37.0-rc3 (18 August 2025)

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v2.37.0-rc2 (12 June 2025)

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v2.37.0-rc1 (5 June 2025)

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v2.36.0 (10 December 2024)

• No longer force fix_param when model has no parameters. (#1288)
• Updated stansummary to use split, rank-normalized Rhat and ESS. (#1301)
• Fixed stansummary crashing if it is run on a csv file without any __ columns (#1283)
• Fixed stansummary not rebuilding when a dependent file changes (#1283)
• Removed support for adding makefile variables in ~/.config/stan/make.local. Use the make/local file in the CmdStan directory instead. (#1282, #1284)
• Windows: Don't try to copy tbb.dll if TBB_TARGETS is undefined. (#1285)

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v2.36.0-rc2 (3 December 2024)

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v2.36.0-rc1 (25 November 2024)

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