The latest version of the current distribution is always available at the download page, for older distribution please follow this link. A maintenance release (MR) covers the latest distribution and platforms and includes all changes and fixes for the current distribution. Public Beta systems are early releases of a distribution, which should be used by experienced users for testing only and not in a production environment. A beta system is only available during a short period and does not require maintenance to be up-to-date (for four weeks from the beta release date).

If necessary we also publish incremental updates for certain components and platforms. Please contact support@gams.com if you need an update for other platforms. If your system needs an incremental update, download it, place it into your GAMS system directory, and install the update. For detailed information please visit: How to install an incremental GAMS update.

• 03 September 2012 - Distribution 23.9.2 (MR) is available at the Distribution Download Area
  • File sizes, MD5-Hash values (use a program like md5sum to verify) and names:

md5deep -rzb *
  83713394  e139d0977e59c9148ceebea674e86073  aix_ppc_64_sfx.exe
 158611585  47ee821328d27235fdb6f779019b9cf0  linux_x64_64_sfx.exe
 139690325  6313fb5845b9f7b2cc323c848835718b  linux_x86_32_sfx.exe
 188601352  1483c439e728e4b744664676636df679  linux_x86_32_wine_sfx.exe
 114165913  f8e444486a7da3314be14d5efa7af730  osx_x64_64_sfx.exe
 100237972  87085b23c54bdb8acf8245e7df046af3  osx_x86_32_sfx.exe
 114648351  5cb42e1dbbf99438ca98865666e80ddc  solaris_sparc_32_sfx.exe
 117793258  1ff76c61434f64a250ff64cc4bb8f52e  solaris_sparc_64_sfx.exe
 109164537  88467ca6a50a977eac5c6e85dec4a854  solaris_x64_64_sfx.exe
  87080218  c3c3440804eb7a66f16d1de1d03ab5b0  windows_x64_64.exe
  87078900  4ddda9cbdbdadc8679b6f76309c33918  windows_x64_64.zip
  74425289  6f7345e0a56208e09c16977258a0488d  windows_x86_32.exe
  74420109  6f19abfdddf7cc9913289bf8b6258c87  windows_x86_32.zip

• 10 July, 2012 - Distribution 23.9.1 is available at the Distribution Download Area

• 05 April, 2012 - Distribution 23.8.2 (MR) is available at the Distribution Download Area
  • Bugfix for models with =X= rows and MCP (i.e. MPSGE)
  • GloMIQO resets OptCR=0 properly to 1e-9 and accepts now Ctrl-C on Windows
  • Knitro handles MINLP failures better
  • XPRESS handles =E= quadratic constraints better now
  • Changed position of Library Form in GAMSIDE (avoid hang in corner to corner screen setup)
  • Model Trnsxcll added to GAMS Data Library
  • Model ps5_s_mn added to GAMS Model Library
• 17 March, 2012 - Released Distribution 23.8.1
• 07 February, 2012 - Released Beta Distribution 23.8.0

• 05 October, 2011 - Released Linux/Wine (Beta)
• 23 August, 2011 - Distribution 23.7.3 (MR) is available at the Distribution Download Area
  • alphaecp: fix problem with accumulating solving times of subsolvers which might lead to an earlier stop
  • apifiles:
    • get rid of warnings in cc interface,
    • fix problem with compilation of fat binaries on Darwin in cc interface
    • fix error in gdxSymbolGetDomain in Python interface
    • fix errors with constant definitions in C# interface
    • add constant definitions and additional constructor (which gets a handle) in Java interfaces
  • conopt3: Version 3.15A maintenance release
  • cplex:
    • fix for interrupt (Ctrl-C) when running with solvelink=5
    • fix memory leak
  • dicopt:
    • fix reporting of objest in case of a crossover
    • fix problem with accumulating solving times of subsolvers which might lead to an earlier stop
  • gamscmex: fix bug related to the internal organization of non-linear code, affects two-argument functions in rare cases
  • gamside:
    • close chart files too when changing system directory
    • GAMS project file name independent of casing
  • gdxdump: suppress on/off empty when writing single symbol
  • gdxmrw: was missing on 64bit Linux
  • grid: fix potential problem with scaling
  • kestrel: added Xpress support
  • minos fix: for interrupt (Ctrl-C)
  • sbb: fix problem with accumulating solving times of subsolvers which might lead to an earlier stop
  • snopt fix: for interrupt (Ctrl-C)
  • xpress: update global search to use callbacks called during root node processing and improve scheme to stop XPRESS when gap is achieved or on user interrupt
• 22 July, 2011 - Released distribution 23.7.2
  • Alphaecp: Alphaecp v2.04.02
  • Conopt3: Fixed a system error 2003
  • Dicopt: Fixed a bug for accidentally determined crossovers
  • Inclib: put_reorderit.gms update from Bruce McCarl
  • Cbc: Disabled preprocessing in case of semicont/semiint variables, it seems buggy
  • Cplex: Does no longer require finite bounds on semicont variables
  • Gamsinst: Fix problem with blanks in sysdir and IDE error when not having a license
• 8 July, 2011 - Released distribution 23.7.1 (Release Notes)
• 24 June, 2011 - Released Beta Distribution 23.7.0

• 8 April, 2011 - Released Distribution 23.6.5(MR)
  • CMEX: Bug fix related to situations with very large number of labels in connection with a restart with continued compilation
• 1 April, 2011 - Released Distribution 23.6.4 (MR)
  • CMEX: Maximal nested includes were raised to 40
  • Mosek: New Version6 Rev 105
  • Lindoglobal: New Version 6.1.1.553
  • Conopt: New Version 3.14W
  • Xpress: Memory leak fix
  • Coin: Solver fixes
  • JAMS: Updates for disjunctions
  • GDXXRW: Fixes
  • GDXMRW: Updates
  • McCarl and GDXUtils: Documentation updates
  • Model Libraries: Updates
• 4 March, 2011 - Incremental updater for gdxmrw (gmsmt_.zip) for Windows 64 bit available
• 15 February, 2011 - Released Distribution 23.6.3
  • Cmex: Fix for variable level projection
  • Bonmin: Several fixes for outer-approximation based algorithms
  • Cplex: New version 12.2.0.2
  • Gurobi: New version 4.0.1
  • Knitro: Documentation update
  • Scip: New version 2.0.1
  • Xpress: Fix for crash on 64 bit Solaris
  • McCarl Guide: Updates for 23.6
  • Gdxxrw: Includes system error message when we cannot start Excel
  • Gdxmrw: Minor bugfixes
• 13 December, 2010 - Released Distribution 23.6.2 (Release Notes)
• 11 November, 2010 - Released new Beta Distribution 23.6.1
  • GAMS option threads now can be set as command line parameter, option, and model attribute
  • GDXXRW: fix for dset
• 06 November, 2010 - Released Beta Distribution 23.6.0

• 18 August, 2010 - Released Distribution 23.5.2 (MR):
  • AlphaECP: Fix for crash running under IDE
  • API: Updated Python and Java APIs and examples
  • Baron: Fixed issue with output formatting under Linux
  • Baron: Memory leak when using BARON with external NLP solver
  • Gdxmerge: Do not use path when checking for merged.gdx
  • Gurobi: Fixed typo for option displayinterval
  • McCarl Guide: Updates for 23.5
  • Mosek 6 rev 85 libraries
  • MPS2GMS: Removed mps2gms debug message
  • Snopt: Fix for wrong return code (local,global)
  • Xlsdump utility added
• 04 July, 2010 - Released Distribution 23.5.1 (Release Notes)

• 24 May, 2010 - Released Distribution 23.4.3 (Release Notes)
• 11 May, 2010 - Released new Public Beta Distribution 23.4.1 with minor fixes.
• 01 May, 2010 - Released Beta Distribution 23.4.0.

• 17 Dec, 2009 - Released Distribution 23.3.3 (MR):
  • MOSEK 6 rev 55 library with bug fixes
  • 32bit HAR utilities available in 64bit Windows System
  • Slow solution reporting in GAMS/Gurobi and other solvers fixed
• 23 Nov, 2009 - Mac OS X only: Bug fix for COINOS
• 18 Nov, 2009 - Released Distribution 23.3.2 (MR).
  • Gurobi 2.0.1 library with bug fixes
  • MOSEK 6 rev 53 library with bug fixes
  • Updated CoinOS library with bug fixes
  • Solver optfile bug fix in GAMSCHK
  • Synchronized tolproj (1e-8) option for solvelink=3
• 01 Nov, 2009 - Released Distribution 23.3.1 (Release Notes)
• 10 Oct, 2009 - Released a Public Beta

• 14 Aug, 2009 - Released Distribution 23.2.1 (Release Notes)

• 23 Jul, 2009 - Released Distribution 23.1.2 (MR):
  • MPSGE: MPSGE ignored the m.workspace and m.workfactor settings
  • GAMSCHK: Fixed a problem with the layout of the reports in some models
• 13 Jul, 2009 - Released Distribution 23.1.1 (Release Notes)
• 21 Jun, 2009 - Released a Public Beta

• 14 Feb, 2009 - Released Distribution 23.0.2 (Release Notes)
• 21 Jan, 2009 - Released a Public Beta

• 01 Dec, 2008 - Released Distribution 22.9.2 (Release Notes)
• 04 Nov, 2008 - Released a Public Beta

• 01 Aug, 2008 - Released Distribution 22.8.1 (Release Notes)
• 14 Jul, 2008 - Released a Public Beta

• 13 May, 2008 - Released Distribution 22.7.2 (MR)
  • DICOPT/ALPHAECP/LOGMIPLBOA: Fixed Cplex scaling bug
  • GAMS/CPLEX: Small cosmetic Cplex bug fix. We got “CPLEX Error 3003: Not a mixed-integer problem.” In case we cannot solve the fixed problem. This was due to some query calls about nodes and iteration.
  • GAMSIDE: Fixed a bug that could cause an out of memory error when moving a row or column to the plane index in the gdx data viewer
  • GAMS/DEA: Avoid writing zeros to GDX files
  • GAMS/LGOLIB: Fixed a memory leak
  • Minor documentation updates
  • Note: AIX and Mac OS X PPC were not updated, please contact support for further information
• 25 Apr, 2008 - Released Distribution 22.7.1 (Release Notes)
• 03 Apr, 2008 - Released a Public Beta

• 27 Feb, 2008 - GAMS/DECIS (incremental Windows 32 bit Update): There was an error in the initialization of the GAMS/DECIS solver that caused it to fail. The updater fixes this issue.
• 22 Jan, 2008 - gdxmerge.exe (incremental Windows 32 bit Update, Windows 64 bit Update, Linux 32 bit Update, Linux 64bit Update): The gdxmerge utility had a problem when merging aliases.
• 09 Jan, 2008 - Updated Distribution, which includes all previous updates and fixes.
• 09 Jan, 2008 - Linux 32bit: Intel Compiler issue.
• 08 Jan, 2008 - Linux 64bit (incremental Linux 64 Update): gamslib and testlib still required the setting of the LD_LOAD_LIBRARY environment variable.
• 07 Jan, 2008 - Updated Distribution Download, which includes all previous updates and fixes
• 07 Jan, 2008 - gdx2access.exe (incremental Windows Update): The executable had some initialization problems.
• 07 Jan, 2007 - Linux 64bit: System required setting of the LD_LOAD_LIBRARY environment variable.
• 23 Dec, 2007 - Released Distribution 22.6 (Release Notes)
• 06 Dec, 2007 - Released a Public Beta

• 01 Jul, 2007 - GAMS/CONOPT (incremental Windows 32bit Update, Linux 32bit Update, Linux 64bit Update): GAMS/CONOPT did not terminate on some problems. This was a tolerance issue, which has been fixed.
• 01 Jul, 2007 - GAMS/CoinCbc (incremental Windows Update): The GAMS/CoinCbc executable had a difficulty to reproduce problem in the B&B part on Windows. The Cbc source was taken from the development branch. The update includes a new Cbc build with the stable version of Cbc.
• 01 Jul, 2007 - GAMS/CoinIpOpt (incremental Windows Update): The GAMS/CoinIpOpt executable had a rare occurring problem in the solver part (MUMPS) on Windows.
• 01 Jul, 2007 - GAMS/CPLEX (incremental Windows 32bit Update, Windows 64bit Update): The interactive option in GAMS/CPLEX terminated the solver job after supplying an option. This has been fixed in the option processing unit. Contact us for other platforms.
• 01 Jul, 2007 - GAMS/CPLEX (incremental Windows 32bit Update): Sometimes the solution of the fixed problem of a MIP does not solve to optimality due to small (dual) infeasibilities. The default behavior of the GAMS/CPLEX link is to return the primal solution values only. If the new option relaxfixedinfeas is set to 1, the small infeasibilities are ignored and a full solution including the dual values are reported back to GAMS.
• 01 Jun, 2007 - Released Distribution 22.5 (Release Notes)
• 26 Apr, 2007 - Released a Public Beta