Update history

The update history for the code forms an integral part of the documentation, and is available in the HTML manuals for the full history of the ongoing major sub-version.

For convenience, the full update history for the PYTHIA 8.1, 8.2 and 8.3 series is collected here. Click the desired sub-version number to read the update note for that.

PYTHIA 8.3 series:

These update notes describe major updates relative to the PYTHIA 8.243 version, which was the starting point for PYTHIA 8.3. The step from 8.2 to 8.3 gave an occasion to break backwards compatibility. The main change is that C++11 is now assumed. The impact on existing used code should be mild, however.

8.306: 28 June 2021

8.305: 03 May 2021

8.304: 09 April 2021

8.303: 01 September 2020

8.302: 24 April 2020

8.301: 30 October 2019

PYTHIA 8.2 series:

These update notes describe major updates relative to the PYTHIA 8.186 version, which was the last 8.1 release. The step from 8.1 to 8.2 gave an occasion to break backwards compatibility, but this should only affect a small part of the user code.

8.245: 29 October 2020

8.244: 20 December 2019

8.243: 4 July 2019

8.242: 1 July 2019

8.240: 20 December 2018

8.235: 27 March 2018

8.230: 6 October 2017

8.226: 26 April 2017

8.223: 5 January 2017

8.219: 10 May 2016

8.215: 4 January 2016

8.212: 23 September 2015

8.210: 29 June 2015

8.209: 25 May 2015

8.205: 23 January 2015

8.204: 22 January 2015

8.201: 14 October 2014

8.200: 11 October 2014

PYTHIA 8.1 series:

These update notes describe major updates relative to the baseline PYTHIA 8.100 version. However, they are less extensive than the corresponding update notes for PYTHIA 6. On the other hand, whereas the PYTHIA 6 manual is a static document, the PYTHIA 8 html/php pages are kept up to date for each subversion.

Important note:version 8.160 does introduce some elements of backwards incompatibility. Specifically, "multiple interactions", abbreviated MI, has been renamed "multiparton interactions", MPI. This affects many parts of the code and documentation. Also some features are deprecated, although remaining until the end of the 8.1xx version series.

8.105: 24 February 2008

8.108: 1 May 2008

8.114: 22 October 2008

8.120: 10 March 2009

8.125: 16 June 2009

8.130: 15 September 2009

8.135: 10 January 2010

8.140: 16 July 2010

8.142: 15 August 2010

8.145: 10 November 2010

8.150: 20 April 2011

8.153: 10 August 2011

8.157: 10 November 2011

8.160: 23 January 2012

8.162: 12 March 2012

8.163: 27 March 2012

8.165: 8 May 2012

8.170: 21 September 2012

8.175: 18 February 2013

8.176: 18 April 2013

8.180: 20 September 2013

8.183: 23 January 2014

8.185: 15 March 2014

8.186: 8 July 2014