[core] Remove deprecated get_object_id() and get_compilation_time()

esphome/core/application.h

@@ -194,15 +194,6 @@ class Application {
   /// Buffer must be BUILD_TIME_STR_SIZE bytes (compile-time enforced)
   void get_build_time_string(std::span<char, BUILD_TIME_STR_SIZE> buffer);
 
-  /// Get the build time as a string (deprecated, use get_build_time_string() instead)
-  // Remove before 2026.7.0
-  ESPDEPRECATED("Use get_build_time_string() instead. Removed in 2026.7.0", "2026.1.0")
-  std::string get_compilation_time() {
-    char buf[BUILD_TIME_STR_SIZE];
-    this->get_build_time_string(buf);
-    return std::string(buf);
-  }
-
   /// Get the cached time in milliseconds from when the current component started its loop execution
   inline uint32_t IRAM_ATTR HOT get_loop_component_start_time() const { return this->loop_component_start_time_; }
 

esphome/core/entity_base.cpp

@@ -147,13 +147,6 @@ std::string EntityBase::get_icon() const {
 }
 #endif  // !USE_ESP8266
 
-// Entity Object ID - computed on-demand from name
-std::string EntityBase::get_object_id() const {
-  char buf[OBJECT_ID_MAX_LEN];
-  size_t len = this->write_object_id_to(buf, sizeof(buf));
-  return std::string(buf, len);
-}
-
 // Calculate Object ID Hash directly from name using snake_case + sanitize
 void EntityBase::calc_object_id_() {
   this->object_id_hash_ = fnv1_hash_object_id(this->name_.c_str(), this->name_.size());

esphome/core/entity_base.h

@@ -73,18 +73,6 @@ class EntityBase {
   // Get whether this Entity has its own name or it should use the device friendly_name.
   bool has_own_name() const { return this->flags_.has_own_name; }
 
-  // Get the sanitized name of this Entity as an ID.
-  // Deprecated: object_id mangles names and all object_id methods are planned for removal.
-  // See https://github.com/esphome/backlog/issues/76
-  // Now is the time to stop using object_id entirely. If you still need it temporarily,
-  // use get_object_id_to() which will remain available longer but will also eventually be removed.
-  ESPDEPRECATED("object_id mangles names and all object_id methods are planned for removal "
-                "(see https://github.com/esphome/backlog/issues/76). "
-                "Now is the time to stop using object_id. If still needed, use get_object_id_to() "
-                "which will remain available longer. get_object_id() will be removed in 2026.7.0",
-                "2025.12.0")
-  std::string get_object_id() const;
-
   // Get the unique Object ID of this Entity
   uint32_t get_object_id_hash() const { return this->object_id_hash_; }
 

esphome/core/entity_helpers.py

@@ -337,7 +337,7 @@ def get_base_entity_object_id(
 
     This function calculates what object_id_c_str_ should be set to in C++.
 
-    The C++ EntityBase::get_object_id() (entity_base.cpp lines 38-49) works as:
+    The C++ EntityBase::write_object_id_to() (entity_base.cpp) works as:
     - If !has_own_name && is_name_add_mac_suffix_enabled():
         return str_sanitize(str_snake_case(App.get_friendly_name()))  // Dynamic
     - Else: