The list of supported versions of the FIX Protocol now includes only FIX 4.2, FIX 4.4 and FIX Latest. There is a machine-readable version for all three of them in form of an Orchestra XML file maintained by the GTC. FIX 5.0 SP2 has been moved to the list of unsupported legacy versions. FIX 5.0 SP2 is basically identical to FIX Latest without the now more than 200 Extension Packs that have been published since the last errata version of FIX 5.0 SP2 in December 2013.
Please see the GTC Update for details.
Please provide questions or comments as feedback in this thread or send an email to fix@fixtrading.org.
Hanno Klein
FIX Technical Director