This outline summarizes the major new features and changes in the API available with ARCHICAD 25 ().

1. System requirements changes
   • macOS system requirements have changed; we support macOS 10.15 and above.
   • Switch to Visual Studio 2019 (v142 toolset) on Windows platform.
2. Technical changes
   • ACAPI_Property_CreatePropertyDefinition: Returns error if the definitionType of the parameter is not supported by the function instead of ignoring its value.
   • ACAPI_Property_ChangePropertyDefinition: Returns error if the definitionType of the parameter is not supported by the function instead of ignoring its value.
   • ACAPI_Property_CreatePropertyGroup: Returns error if the groupType of the parameter is not supported by the function instead of ignoring its value.
   • ACAPI_Property_ChangePropertyGroup: Returns error if the groupType of the parameter is not supported by the function instead of ignoring its value.
   • UC261, LineType UserControl no longer allows adjustable line height; has a new field (scaledness) for the header view; and a new named separator cell type (CF261_HEADER)
3. New functionality
   • Add-ons can now define and register their own custom commands. Please see below the related structures and functions.
   • The new component API makes it easier to query components of an element, and you can access the definitions and values of their properties.
   • Introduced the Structural Analytical Load Case, Load Group and Load Combination. Please see below the related structures and functions.
   • Send and Receive operations are available now via the API with the new Teamwork API functions.
   • New HTTP network client communication module is available for Add-Ons. For details please check the CommunicationClient_Test example.
   • A new 3D model rendering control was introduced. It can display any Modeler::Model3D model, and is capable of handling custom camera events on mouse interactions. See the Model3DViewer_Test Add-On in the examples.
   • The mapping of the hotlink proxy elements and source elements can be retrieved.
4. Modified/new structures
   • Non-localized enumeration values in API Properties
     • API_PropertyValue
       a
       • singleEnumVariant and multipleEnumVariant members have been removed.
       • In case of enumeration values the keyVariant of the selected enum value is now stored in the singleVariant or listVariant member instead.
       • If you need to, you can retrieve the displayVariant or nonLocalizedValue of the enumeration from the property definition’s possibleEnumValues member based on the stored keyVariant. (However if you need only a display string, you can still use the ACAPI_Property_GetPropertyValueString function without further modifications.)
     • API_SingleEnumerationVariant
       • No longer used in API_PropertyValue (see above).
       • nonLocalizedValue member added.
     • API_MultipleEnumerationVariant ⇒ this structure has been removed. (No longer used anywhere because it’s not used in API_PropertyValue any more (see above).)
   • API_AddOnCommand ⇒ new structure describing the Add-On commands.
   • API_AddOnCommandExecutionPolicy ⇒ new enum describing the Add-On commands execution policy.
   • API_SubElement ⇒ Renamed API_SubElemMemoMarker to API_SubElement.
   • API_SubElementType ⇒ Renamed API_SubElemMemoMarkerType to API_SubElementType.
   • API_Favorite ⇒ The subElements member was introduced, contains the subelements of the API_Favorite.
   • API_OverrideStyle ⇒ The cutFillBGPen, coverFillBGPen, draftingFillBGPen, cutSurfaceType and uncutSurfaceType members type are changed to API_OverriddenAttributeOrRGB. Two new members are added that control the hiding of contour lines: hideCutContours and hideUncutContours.
   • API_OverrideRuleStyle ⇒ The fillBackgroundPenOverride and surfaceOverride members type are changed to API_OverriddenAttributeOrRGB. New functionality added to control contour visibility: overrideContours enables hiddenContours of type API_OverriddenSurfaceType.
   • API_GeoLocation ⇒ new structure for managing the Geo Location settings of the project..
   • API_GeoReferenceData ⇒ new structure that holds the georeferencing parameters associated to the project.
   • API_AnalyticalLinkGeometry ⇒ The curves member was introduced, describes the joining curves of the 2D link.
   • API_CalcRulesPrefs ⇒ new conditional element rule data structure.
   • API_ConditionalElementRule ⇒ new structure describing a conditional element rule.
   • API_ConditionalElementPropertyTypeID ⇒ new enum describing the property type in a conditional element rule.
   • API_AnalyticalMemberPartRef ⇒ The data which described custom vertex and ratio edge type, it has been moved to separate structures.
   • API_AMPartRefCustomVertexData ⇒ Sub-structure of API_AnalyticalMemberPartRef, it describes a vertex when the type requires it.
   • API_AMPartRefRatioEdgeData ⇒ Sub-structure of API_AnalyticalMemberPartRef, it describes ratios when the type requires it.
   • Components
     • API_ComponentID ⇒ new structure that identifies a component.
     • API_ElemComponentID ⇒ new structure that identifies a component of an element.
     • API_ListDataID ⇒ API_ComponentID is renamed to API_Obsolete_ComponentID and marked as obsolete.
     • API_Obsolete_ComponentType ⇒ API_ComponentType is renamed to API_Obsolete_ComponentType and marked as obsolete.
     • API_Obsolete_ComponentRefType ⇒ API_ComponentRefType is renamed to API_Obsolete_ComponentRefType and marked as obsolete.
   • Structural Analytical Load Case and Load Group
     • API_AnalyticalLoadCase ⇒ new structure that identifies a load case.
     • API_AnalyticalLoadCaseActionType ⇒ new structure that identifies an action type of a load case
     • API_AnalyticalLoadCaseDuration ⇒ new structure that identifies a duration of a load case.
     • API_AnalyticalLoadCaseLoadType ⇒ new structure that identifies a load type of a load case.
     • API_AnalyticalLoadGroup ⇒ new structure that identifies a load group.
     • API_AnalyticalLoadGroupRelation ⇒ new structure that identifies a relation of a load group.
     • API_AnalyticalLoadGroupType ⇒ new structure that identifies a group type of a load group.
   • API_IFCClassification ⇒ new description and location members for IFC4.
   • API_IFCClassificationReference ⇒ new readOnly member.
5. Modified/new functions
   • APIDb_GetHotlinkProxyElementTableID: New function.
   • ACAPI_ActionCenter_Check: New function.
   • ACAPI_TeamworkControl_SendChanges: New function.
   • ACAPI_TeamworkControl_ReceiveChanges: New function.
   • ACAPI_TeamworkControl_GetTeamworkProjectDetails: New function.
   • ACAPI_TeamworkControl_ReserveElements: New enableDialogs parameter was introduced to perform silent operations.
   • ACAPI_TeamworkControl_ReleaseElements: New enableDialogs parameter was introduced to perform silent operations.
   • ACAPI_TeamworkControl_GetLockableStatus: The conflicts parameter returns userIds instead of usernames. Use ACAPI_TeamworkControl_GetUsernameFromId to convert userId to username.
   • ACAPI_TeamworkControl_ReserveLockable: The conflicts parameter returns userIds instead of usernames. Use ACAPI_TeamworkControl_GetUsernameFromId to convert userId to username.
   • ACAPI_TeamworkControl_GetUsernameFromId: Use it to get the username of a user identified by a short id in a Teamwork project.
   • APIDb_SetActualRenovationFilterID ⇒ change the actual renovation filter.
   • ACAPI_Property_IsValidValue ⇒ returns true if the value is acceptable for the given definition.
   • ACAPI_Install_AddOnCommandHandler 
   • Components
     • ACAPI_Element_GetComponents ⇒ new function that retrieves all components of an element.
     • ACAPI_ElemComponent_GetPropertyDefinitions ⇒ new function that retrieves all property definitions of a component.
     • ACAPI_ElemComponent_GetPropertyDefinitions ⇒ new function that retrieves the value of a property.
     • ACAPI_ElemComponent_GetPropertyDefinitions ⇒ new function that retrieves the values of properties.
     • ACAPI_ElemComponent_GetPropertyValuesByGuid ⇒ new function that retrieves the values of properties by guid.
     • ACAPI_Element_GetComponents_Obsolete ⇒ ACAPI_Element_GetComponents is renamed to ACAPI_Element_GetComponents_Obsolete and marked as obsolete.
     • APIEnv_IsSurveyPointVisibleID, APIEnv_SetSurveyPointVisibilityID ⇒ new Environment functions to manage the visibility of the survey point.
   • Structural Analytical Load Case and Load Group
     • ACAPI_AnalyticalModel_GetAnalyticalLoadGroups ⇒ new function that retrieves all existing load groups.
     • ACAPI_AnalyticalModel_GetAnalyticalLoadGroup ⇒ new function that retrieves a load group by guid.
     • ACAPI_AnalyticalModel_CreateAnalyticalLoadGroup ⇒ new function that creates a load group.
     • ACAPI_AnalyticalModel_DeleteAnalyticalLoadGroup ⇒ new function that deletes a load group by guid.
     • ACAPI_AnalyticalModel_GetAllAnalyticalLoadCases ⇒ new function that retrieves all existing load cases, regardless of their group.
     • ACAPI_AnalyticalModel_GetAnalyticalLoadCases ⇒ new function that retrieves all load cases of a load group.
     • ACAPI_AnalyticalModel_GetAnalyticalLoadCase ⇒ new function that retrieves a load case by guid.
     • ACAPI_AnalyticalModel_CreateAnalyticalLoadCase ⇒ new function that creates a load case.
     • ACAPI_AnalyticalModel_DeleteAnalyticalLoadCase ⇒ new function that deletes a load case by guid.
   • ACAPI_Property_SetPropertyValueFromString: new function that fills an API_Property based on a passed string value.

Note: You may also check the list of the new API features in the former ARCHICAD versions.