With each new AutoCAD-based product release, retest your custom applications to ensure they work correctly before rolling out the latest release to all users.
Third-party applications might need to be repurchased and in-house custom .NET and ObjectARX applications might need to be recompiled when upgrading to the latest release. The changes to the AutoCAD application programming interfaces (APIs) varies from release to release with most major changes being aligned with the introduction of a new native drawing file format.
The following table lists the .NET and ObjectARX SDKs that are supported with the corresponding AutoCAD release.
| AutoCAD Release | Supported .NET and ObjectARX SDK | .NET |
|---|---|---|
| AutoCAD 2026 | AutoCAD 2026, AutoCAD 2025 | 8.0 |
| AutoCAD 2025 | AutoCAD 2025 | 8.0 |
| AutoCAD 2024 | AutoCAD 2024,AutoCAD 2023, AutoCAD 2022, AutoCAD 2021 | 4.8 |
| AutoCAD 2023 | AutoCAD 2023, AutoCAD 2022, AutoCAD 2021 | 4.8 |
| AutoCAD 2022 | AutoCAD 2022, AutoCAD 2021 | 4.8 |
| AutoCAD 2021 | AutoCAD 2021 | 4.8 |
| AutoCAD 2020 | AutoCAD 2020, AutoCAD 2019 | 4.7 |
| AutoCAD 2019 | AutoCAD 2019 | 4.7 |
| AutoCAD 2018 | AutoCAD 2018 | 4.6 |
| AutoCAD 2017 | AutoCAD 2017 | 4.6 |
| AutoCAD 2016 | AutoCAD 2016, AutoCAD 2015 | 4.5 |
| AutoCAD 2015 | AutoCAD 2015 | 4.5 |
| AutoCAD 2014 | AutoCAD 2014, AutoCAD 2013 | 4.0 |
| AutoCAD 2013 | AutoCAD 2013 | 4.0 |
| AutoCAD 2012 | AutoCAD 2012, AutoCAD 2011, AutoCAD 2010 | 3.51 SP1 |
| AutoCAD 2011 | AutoCAD 2011, AutoCAD 2010 | 3.51 SP1 |
| AutoCAD 2010 | AutoCAD 2010 | 3.51 SP1 |
| AutoCAD 2009 | AutoCAD 2009, AutoCAD 2008, AutoCAD 2007 | 3.0 |
| AutoCAD 2008 | AutoCAD 2008, AutoCAD 2007 | 2.0 |
| AutoCAD 2007 | AutoCAD 2007 | 2.0 |
| AutoCAD 2006 | AutoCAD 2006, AutoCAD 2005, AutoCAD 2004 | 1.1 SP1 |
| AutoCAD 2005 | AutoCAD 2005, AutoCAD 2004 | 1.1 |
| AutoCAD 2004 | AutoCAD 2004 | N/A |
The following resources can be helpful in determining the changes to the APIs that might impact your custom programs:
- Product Help – Changes that affect the AutoLISP programming language can be found in the 'New and Changed AutoLISP Functions Reference (AutoLISP)' topic of the product's online Help.
- ActiveX Reference Guide – Changes to the ActiveX API can be found under the ActiveX API History topic of the ActiveX Developer’s Guide (<drive>:\Program Files\Common Files\Autodesk Shared\acad_aag.chm).
- Managed .NET SDK – Changes to the Managed .NET SDK can be found in the What’s New and Migration Guide section of the Managed .NET Reference Guide (<drive>:\<objectarx install folder>\docs\arxmgd.chm - https://www.autodesk.com/developer-network/platform-technologies/autocad/objectarx).
- ObjectARX SDK – Changes to the ObjectARX SDK can be found in the What’s New and Migration Guide section of the ObjectARX Reference Guide (<drive>:\<objectarx install folder>\docs\arxref.chm - https://www.autodesk.com/developer-network/platform-technologies/autocad/objectarx)