diff --git a/lib/models/content/avatar.dart b/lib/models/content/avatar.dart
index 25167e9..a5ce877 100644
--- a/lib/models/content/avatar.dart
+++ b/lib/models/content/avatar.dart
@@ -4,11 +4,11 @@ import "package:nexus/models/info/image.dart";
 part "avatar.freezed.dart";
 part "avatar.g.dart";
 
-@freezed
-sealed class AvatarContent extends Content with _$AvatarContent {
-  AvatarContent._();
-  factory AvatarContent({ImageInfo? info, Uri? url}) = _AvatarContent;
-
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const AvatarContent({final ImageInfo? info, final Uri? url})
+    extends Content
+    with _$AvatarContent {
   factory AvatarContent.fromJson(Map<String, Object?> json) =>
       _$AvatarContentFromJson(json);
 }
diff --git a/lib/models/content/canonical_alias.dart b/lib/models/content/canonical_alias.dart
index 6fb2829..f8bca3a 100644
--- a/lib/models/content/canonical_alias.dart
+++ b/lib/models/content/canonical_alias.dart
@@ -4,15 +4,12 @@ import "package:nexus/models/content/content.dart";
 part "canonical_alias.freezed.dart";
 part "canonical_alias.g.dart";
 
-@freezed
-sealed class CanonicalAliasContent extends Content
-    with _$CanonicalAliasContent {
-  CanonicalAliasContent._();
-  factory CanonicalAliasContent({
-    @JsonKey(includeIfNull: false) String? alias,
-    @Default(ISet.empty()) ISet<String> altAliases,
-  }) = _CanonicalAliasContent;
-
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const CanonicalAliasContent({
+  @JsonKey(includeIfNull: false) final String? alias,
+  final ISet<String> altAliases = const .empty(),
+}) extends Content with _$CanonicalAliasContent {
   factory CanonicalAliasContent.fromJson(Map<String, Object?> json) =>
       _$CanonicalAliasContentFromJson(json);
 }
diff --git a/lib/models/content/create.dart b/lib/models/content/create.dart
index b937a94..18353df 100644
--- a/lib/models/content/create.dart
+++ b/lib/models/content/create.dart
@@ -4,22 +4,16 @@ import "package:nexus/models/content/content.dart";
 part "create.freezed.dart";
 part "create.g.dart";
 
-@freezed
-sealed class CreateContent extends Content with _$CreateContent {
-  CreateContent._();
-  factory CreateContent({
-    @JsonKey(name: "additional_creators")
-    @Default(IList.empty())
-    IList<String> additionalCreatorIds,
-
-    PreviousRoom? predecessor,
-
-    @JsonKey(name: "m.federate") @Default(true) bool federated,
-
-    @Default("1") String roomVersion,
-    @JsonKey(unknownEnumValue: RoomType.room) RoomType? type,
-  }) = _CreateContent;
-
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const CreateContent({
+  @JsonKey(name: "additional_creators")
+  final IList<String> additionalCreatorIds = const .empty(),
+  final PreviousRoom? predecessor,
+  @JsonKey(name: "m.federate") final bool federated = true,
+  final String roomVersion = "1",
+  @JsonKey(unknownEnumValue: RoomType.room) final RoomType? type,
+}) extends Content with _$CreateContent {
   factory CreateContent.fromJson(Map<String, Object?> json) =>
       _$CreateContentFromJson(json);
 }
diff --git a/lib/models/content/encrypted.dart b/lib/models/content/encrypted.dart
index 8658a71..2fd7e4a 100644
--- a/lib/models/content/encrypted.dart
+++ b/lib/models/content/encrypted.dart
@@ -3,10 +3,11 @@ import "package:nexus/models/content/content.dart";
 part "encrypted.freezed.dart";
 part "encrypted.g.dart";
 
-@freezed
-sealed class EncryptedContent extends Content with _$EncryptedContent {
-  EncryptedContent._();
-  factory EncryptedContent() = _EncryptedContent;
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const EncryptedContent() extends Content with _$EncryptedContent {
+  @override
+  Map<String, Object?> toJson() => _$EncryptedContentToJson(this);
 
   factory EncryptedContent.fromJson(Map<String, Object?> json) =>
       _$EncryptedContentFromJson(json);
diff --git a/lib/models/content/encryption.dart b/lib/models/content/encryption.dart
index 52c7b34..5839132 100644
--- a/lib/models/content/encryption.dart
+++ b/lib/models/content/encryption.dart
@@ -3,21 +3,13 @@ import "package:nexus/models/content/content.dart";
 part "encryption.freezed.dart";
 part "encryption.g.dart";
 
-@freezed
-sealed class EncryptionContent extends Content with _$EncryptionContent {
-  EncryptionContent._();
-  factory EncryptionContent({
-    required String algorithm,
-
-    @JsonKey(name: "rotation_period_ms")
-    @Default(604800000)
-    int rotationPeriodMS,
-
-    @JsonKey(name: "rotation_period_msgs")
-    @Default(100)
-    int rotationPeriodMessages,
-  }) = _EncryptionContent;
-
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const EncryptionContent({
+  required final String algorithm,
+  @JsonKey(name: "rotation_period_ms") final int rotationPeriodMS = 604800000,
+  @JsonKey(name: "rotation_period_msgs") final int rotationPeriodMessages = 100,
+}) extends Content with _$EncryptionContent {
   factory EncryptionContent.fromJson(Map<String, Object?> json) =>
       _$EncryptionContentFromJson(json);
 }
diff --git a/lib/models/content/history_visibility.dart b/lib/models/content/history_visibility.dart
index 65b6160..f44fc91 100644
--- a/lib/models/content/history_visibility.dart
+++ b/lib/models/content/history_visibility.dart
@@ -3,15 +3,12 @@ import "package:nexus/models/content/content.dart";
 part "history_visibility.freezed.dart";
 part "history_visibility.g.dart";
 
-@freezed
-sealed class HistoryVisibilityContent extends Content
-    with _$HistoryVisibilityContent {
-  HistoryVisibilityContent._();
-  factory HistoryVisibilityContent({
-    @JsonKey(unknownEnumValue: HistoryVisibility.unknown)
-    required HistoryVisibility historyVisibility,
-  }) = _HistoryVisibilityContent;
-
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const HistoryVisibilityContent({
+  @JsonKey(unknownEnumValue: HistoryVisibility.unknown)
+  required final HistoryVisibility historyVisibility,
+}) extends Content with _$HistoryVisibilityContent {
   factory HistoryVisibilityContent.fromJson(Map<String, Object?> json) =>
       _$HistoryVisibilityContentFromJson(json);
 }
diff --git a/lib/models/content/image_pack.dart b/lib/models/content/image_pack.dart
index 5a62fc2..93e9835 100644
--- a/lib/models/content/image_pack.dart
+++ b/lib/models/content/image_pack.dart
@@ -6,14 +6,12 @@ part "image_pack.freezed.dart";
 part "image_pack.g.dart";
 
 /// An image pack (MSC2545), from a room's state.
-@freezed
-sealed class ImagePackContent extends Content with _$ImagePackContent {
-  ImagePackContent._();
-  factory ImagePackContent({
-    @Default(IMap.empty()) IMap<String, PackImage> images,
-    PackInfo? pack,
-  }) = _ImagePackContent;
-
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const ImagePackContent({
+  final IMap<String, PackImage> images = const .empty(),
+  final PackInfo? pack,
+}) extends Content with _$ImagePackContent {
   IMap<String, PackImage> imagesFor(ImageUsage usage) => images.where(
     (_, image) => switch ((image.usage, pack?.usage ?? const .empty())) {
       (final usages, _) when usages.isNotEmpty => usages.contains(usage),
diff --git a/lib/models/content/join_rules.dart b/lib/models/content/join_rules.dart
index 20d2a60..4eb09f7 100644
--- a/lib/models/content/join_rules.dart
+++ b/lib/models/content/join_rules.dart
@@ -5,14 +5,12 @@ import "package:nexus/models/join_rule.dart";
 part "join_rules.freezed.dart";
 part "join_rules.g.dart";
 
-@freezed
-sealed class JoinRulesContent extends Content with _$JoinRulesContent {
-  JoinRulesContent._();
-  factory JoinRulesContent({
-    @JsonKey(unknownEnumValue: JoinRule.unknown) required JoinRule joinRule,
-    @Default(ISet.empty()) ISet<AllowCondition> allow,
-  }) = _JoinRulesContent;
-
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const JoinRulesContent({
+  @JsonKey(unknownEnumValue: JoinRule.unknown) required final JoinRule joinRule,
+  final ISet<AllowCondition> allow = const .empty(),
+}) extends Content with _$JoinRulesContent {
   factory JoinRulesContent.fromJson(Map<String, Object?> json) =>
       _$JoinRulesContentFromJson(json);
 }
diff --git a/lib/models/content/membership.dart b/lib/models/content/membership.dart
index 90e6c9f..3e8d181 100644
--- a/lib/models/content/membership.dart
+++ b/lib/models/content/membership.dart
@@ -4,26 +4,20 @@ import "package:nexus/models/membership_status.dart";
 part "membership.freezed.dart";
 part "membership.g.dart";
 
-@freezed
-sealed class MembershipContent extends Content with _$MembershipContent {
-  MembershipContent._();
-
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const MembershipContent({
+  @JsonKey(name: "displayname", fromJson: MembershipContent.displaynameFromJson)
+  required final String? displayName,
+  @JsonKey(name: "membership", unknownEnumValue: MembershipStatus.unknown)
+  required final MembershipStatus status,
+  final Uri? avatarUrl,
+  final String? reason,
+  final bool isDirect = false,
+}) extends Content with _$MembershipContent {
   static String? displaynameFromJson(String? displayName) =>
       displayName?.isEmpty == true ? null : displayName;
 
-  factory MembershipContent({
-    @JsonKey(
-      name: "displayname",
-      fromJson: MembershipContent.displaynameFromJson,
-    )
-    required String? displayName,
-    @JsonKey(name: "membership", unknownEnumValue: MembershipStatus.unknown)
-    required MembershipStatus status,
-    Uri? avatarUrl,
-    String? reason,
-    @Default(false) bool isDirect,
-  }) = _MembershipContent;
-
   factory MembershipContent.fromJson(Map<String, Object?> json) =>
       _$MembershipContentFromJson(json);
 }
diff --git a/lib/models/content/name.dart b/lib/models/content/name.dart
index c451d64..6f53eb5 100644
--- a/lib/models/content/name.dart
+++ b/lib/models/content/name.dart
@@ -3,11 +3,11 @@ import "package:nexus/models/content/content.dart";
 part "name.freezed.dart";
 part "name.g.dart";
 
-@freezed
-sealed class NameContent extends Content with _$NameContent {
-  NameContent._();
-  factory NameContent({required String name}) = _NameContent;
-
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const NameContent({required final String name})
+    extends Content
+    with _$NameContent {
   factory NameContent.fromJson(Map<String, Object?> json) =>
       _$NameContentFromJson(json);
 }
diff --git a/lib/models/content/pinned_events.dart b/lib/models/content/pinned_events.dart
index 9dac5de..7f309c4 100644
--- a/lib/models/content/pinned_events.dart
+++ b/lib/models/content/pinned_events.dart
@@ -4,13 +4,11 @@ import "package:nexus/models/content/content.dart";
 part "pinned_events.freezed.dart";
 part "pinned_events.g.dart";
 
-@freezed
-sealed class PinnedEventsContent extends Content with _$PinnedEventsContent {
-  PinnedEventsContent._();
-  factory PinnedEventsContent({
-    @Default(IList.empty()) @JsonKey(name: "pinned") IList<String> pinnedEvents,
-  }) = _PinnedEventsContent;
-
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const PinnedEventsContent({
+  @JsonKey(name: "pinned") final IList<String> pinnedEvents = const .empty(),
+}) extends Content with _$PinnedEventsContent {
   factory PinnedEventsContent.fromJson(Map<String, Object?> json) =>
       _$PinnedEventsContentFromJson(json);
 }
diff --git a/lib/models/content/power_levels.dart b/lib/models/content/power_levels.dart
index afa0e23..8b1dba9 100644
--- a/lib/models/content/power_levels.dart
+++ b/lib/models/content/power_levels.dart
@@ -4,22 +4,20 @@ import "package:nexus/models/content/content.dart";
 part "power_levels.freezed.dart";
 part "power_levels.g.dart";
 
-@freezed
-sealed class PowerLevelsContent extends Content with _$PowerLevelsContent {
-  PowerLevelsContent._();
-  factory PowerLevelsContent({
-    @Default(IMap.empty()) IMap<String, int> events,
-    @Default(IMap.empty()) IMap<String, int> users,
-    @JsonKey(includeIfNull: false) Notifications? notifications,
-    @Default(50) int ban,
-    @Default(0) int eventsDefault,
-    @Default(0) int invite,
-    @Default(50) int kick,
-    @Default(50) int redact,
-    @Default(50) int stateDefault,
-    @Default(0) int usersDefault,
-  }) = _PowerLevelsContent;
-
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const PowerLevelsContent({
+  final IMap<String, int> events = const .empty(),
+  final IMap<String, int> users = const .empty(),
+  @JsonKey(includeIfNull: false) final Notifications? notifications,
+  final int ban = 50,
+  final int eventsDefault = 0,
+  final int invite = 0,
+  final int kick = 50,
+  final int redact = 50,
+  final int stateDefault = 50,
+  final int usersDefault = 0,
+}) extends Content with _$PowerLevelsContent {
   factory PowerLevelsContent.fromJson(Map<String, Object?> json) =>
       _$PowerLevelsContentFromJson(json);
 }
diff --git a/lib/models/content/reaction.dart b/lib/models/content/reaction.dart
index 347350d..3990788 100644
--- a/lib/models/content/reaction.dart
+++ b/lib/models/content/reaction.dart
@@ -3,19 +3,17 @@ import "package:nexus/models/content/content.dart";
 part "reaction.freezed.dart";
 part "reaction.g.dart";
 
-@Freezed(toJson: false)
-sealed class ReactionContent extends Content with _$ReactionContent {
-  ReactionContent._();
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const ReactionContent({
+  @JsonKey(readValue: ReactionContent.keyJsonFromJson) final String? key,
+
+  /// For custom emoji reactions
+  @JsonKey(name: "com.beeper.reaction.shortcode") final String? shortcode,
+}) extends Content with _$ReactionContent {
   static String? keyJsonFromJson(Map<dynamic, dynamic> json, String key) =>
       json["m.relates_to"]?["key"];
 
-  factory ReactionContent({
-    @JsonKey(readValue: ReactionContent.keyJsonFromJson) String? key,
-
-    /// For custom emoji reactions
-    @JsonKey(name: "com.beeper.reaction.shortcode") String? shortcode,
-  }) = _ReactionContent;
-
   @override
   Map<String, dynamic> toJson() => {
     "m.relates_to": {"key": key},
diff --git a/lib/models/content/redaction.dart b/lib/models/content/redaction.dart
index 2ed6436..9b855f8 100644
--- a/lib/models/content/redaction.dart
+++ b/lib/models/content/redaction.dart
@@ -3,12 +3,11 @@ import "package:nexus/models/content/content.dart";
 part "redaction.freezed.dart";
 part "redaction.g.dart";
 
-@freezed
-sealed class RedactionContent extends Content with _$RedactionContent {
-  RedactionContent._();
-  factory RedactionContent({String? reason, String? redacts}) =
-      _RedactionContent;
-
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const RedactionContent({final String? reason, final String? redacts})
+    extends Content
+    with _$RedactionContent {
   factory RedactionContent.fromJson(Map<String, Object?> json) =>
       _$RedactionContentFromJson(json);
 }
diff --git a/lib/models/content/server_acl.dart b/lib/models/content/server_acl.dart
index 3873bf3..1bfcfdb 100644
--- a/lib/models/content/server_acl.dart
+++ b/lib/models/content/server_acl.dart
@@ -4,15 +4,13 @@ import "package:nexus/models/content/content.dart";
 part "server_acl.freezed.dart";
 part "server_acl.g.dart";
 
-@freezed
-sealed class ServerACLContent extends Content with _$ServerACLContent {
-  ServerACLContent._();
-  factory ServerACLContent({
-    @Default(IList.empty()) IList<String> allow,
-    @Default(IList.empty()) IList<String> deny,
-    @Default(true) allowIpLiterals,
-  }) = _ServerACLContent;
-
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const ServerACLContent({
+  final IList<String> allow = const .empty(),
+  final IList<String> deny = const .empty(),
+  final bool allowIpLiterals = true,
+}) extends Content with _$ServerACLContent {
   factory ServerACLContent.fromJson(Map<String, Object?> json) =>
       _$ServerACLContentFromJson(json);
 }
diff --git a/lib/models/content/sticker.dart b/lib/models/content/sticker.dart
index c6fa893..2b3e0fa 100644
--- a/lib/models/content/sticker.dart
+++ b/lib/models/content/sticker.dart
@@ -4,15 +4,13 @@ import "package:nexus/models/info/image.dart";
 part "sticker.freezed.dart";
 part "sticker.g.dart";
 
-@freezed
-sealed class StickerContent extends Content with _$StickerContent {
-  StickerContent._();
-  factory StickerContent({
-    required String body,
-    required ImageInfo info,
-    required Uri url,
-  }) = _StickerContent;
-
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const StickerContent({
+  required final String body,
+  required final ImageInfo info,
+  required final Uri url,
+}) extends Content with _$StickerContent {
   factory StickerContent.fromJson(Map<String, Object?> json) =>
       _$StickerContentFromJson(json);
 }
diff --git a/lib/models/content/topic.dart b/lib/models/content/topic.dart
index c8256e3..13370f4 100644
--- a/lib/models/content/topic.dart
+++ b/lib/models/content/topic.dart
@@ -5,14 +5,12 @@ import "package:nexus/models/content/content.dart";
 part "topic.freezed.dart";
 part "topic.g.dart";
 
-@freezed
-sealed class TopicContent extends Content with _$TopicContent {
-  TopicContent._();
-  factory TopicContent({
-    required String topic,
-    @JsonKey(name: "m.topic") TopicContentBlock? content,
-  }) = _TopicContent;
-
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const TopicContent({
+  required final String topic,
+  @JsonKey(name: "m.topic") final TopicContentBlock? content,
+}) extends Content with _$TopicContent {
   factory TopicContent.fromJson(Map<String, Object?> json) =>
       _$TopicContentFromJson(json);
 }
@@ -20,7 +18,7 @@ sealed class TopicContent extends Content with _$TopicContent {
 @Freezed(toJson: false, fromJson: false)
 @JsonSerializable()
 class const TopicContentBlock({
-  final IList<TextualRepresentation> representations = const IList.empty(),
+  final IList<TextualRepresentation> representations = const .empty(),
 }) with _$TopicContentBlock {
   Map<String, Object?> toJson() => _$TopicContentBlockToJson(this);