With the release of PYTHIA 8.3, we recommend all users to download and use that, rather than a release in the PYTHIA 8.2 series.


While the release of PYTHIA 8.100 marked a clear break with the Fortran-based PYTHIA 6.4, the introduction of PYTHIA 8.2 follows the path of gradual evolution. That is, the new version does involve several new features, and some backwards incompatibilities, but not anything really dramatic. User-written programs that worked with 8.186 are also likely to work with 8.200, or at most require modest adjustments. Given the low threshold, the advantages with the new version made for a reasonably rapid transition.

The next version, PYTHIA 8.3, offers a slightly larger step from 8.2 than that between 8.1 and 8.2, but again no major incompatibilities. Therefore we expect a new rapid transition. No further major upgrades are planned for 8.2, but possibly there will be some bug-fix releases before the code is fully frozen.

Look here for information on how to obtain new version alerts, how to contact us and how you can help us further develop PYTHIA.


To get going with the program, do the following (on a Linux or Mac OS X system):


All necessary information how to run the program is available in subdirectories of the pythia8245 directory you unpacked above, and copies of them are also linked here.

Earlier versions

Normally there should be no reason now to install an older, obsolete version.
However, for backwards checks, this might be required, and they can be downloaded on the downloads page.