diff --git a/backend/open_webui/models/prompts.py b/backend/open_webui/models/prompts.py
index fbf540120..808073a45 100644
--- a/backend/open_webui/models/prompts.py
+++ b/backend/open_webui/models/prompts.py
@@ -3,7 +3,7 @@ import time
 import uuid
 from typing import Optional
 
-from sqlalchemy import select, delete, update, or_, func, cast, String
+from sqlalchemy import select, delete, update, or_, func, text, cast, String
 from sqlalchemy.ext.asyncio import AsyncSession
 from open_webui.internal.db import Base, JSONField, get_async_db_context
 from open_webui.models.groups import Groups
@@ -260,12 +260,12 @@ class PromptsTable:
     ) -> PromptListResponse:
         async with get_async_db_context(db) as db:
             # Join with User table for user filtering and sorting
-            stmt = select(Prompt, User).outerjoin(User, User.id == Prompt.user_id)
+            query = select(Prompt, User).outerjoin(User, User.id == Prompt.user_id)
 
             if filter:
                 query_key = filter.get('query')
                 if query_key:
-                    stmt = stmt.filter(
+                    query = query.filter(
                         or_(
                             Prompt.name.ilike(f'%{query_key}%'),
                             Prompt.command.ilike(f'%{query_key}%'),
@@ -277,14 +277,14 @@ class PromptsTable:
 
                 view_option = filter.get('view_option')
                 if view_option == 'created':
-                    stmt = stmt.filter(Prompt.user_id == user_id)
+                    query = query.filter(Prompt.user_id == user_id)
                 elif view_option == 'shared':
-                    stmt = stmt.filter(Prompt.user_id != user_id)
+                    query = query.filter(Prompt.user_id != user_id)
 
                 # Apply access grant filtering
-                stmt = AccessGrants.has_permission_filter(
+                query = AccessGrants.has_permission_filter(
                     db=db,
-                    query=stmt,
+                    query=query,
                     DocumentModel=Prompt,
                     filter=filter,
                     resource_type='prompt',
@@ -293,56 +293,61 @@ class PromptsTable:
 
                 tag = filter.get('tag')
                 if tag:
-                    # SQLite stores JSON text via json.dumps(ensure_ascii=True),
-                    # so non-ASCII chars are \uXXXX-escaped. PostgreSQL native JSONB
-                    # stores literal Unicode. Use the right pattern for each.
-                    if db.bind.dialect.name == 'sqlite':
-                        if tag.isascii():
-                            tags_text = func.lower(cast(Prompt.tags, String))
-                            pattern = f'%{json.dumps(tag.lower())}%'
-                        else:
-                            # LOWER() is ASCII-only; non-ASCII codepoints would
-                            # produce different \uXXXX escapes when lowered.
-                            tags_text = cast(Prompt.tags, String)
-                            pattern = f'%{json.dumps(tag)}%'
+                    bind = await db.connection()
+                    dialect_name = bind.dialect.name
+                    tag_lower = tag.lower()
+
+                    if dialect_name == 'sqlite':
+                        tag_clause = text(
+                            "EXISTS (SELECT 1 FROM json_each(prompt.tags) t WHERE LOWER(t.value) = :tag_val)"
+                        )
+                    elif dialect_name == 'postgresql':
+                        tag_clause = text(
+                            "EXISTS (SELECT 1 FROM json_array_elements_text(prompt.tags) t WHERE LOWER(t) = :tag_val)"
+                        )
                     else:
-                        tags_text = func.lower(cast(Prompt.tags, String))
-                        pattern = f'%{json.dumps(tag.lower(), ensure_ascii=False)}%'
-                    stmt = stmt.filter(tags_text.like(pattern))
+                        # Fallback: LIKE on serialised JSON text (ASCII-safe only)
+                        tag_clause = func.lower(cast(Prompt.tags, String)).like(f'%{json.dumps(tag_lower, ensure_ascii=False)}%')
+                        tag_lower = None
+
+                    if tag_lower is not None:
+                        query = query.filter(tag_clause.params(tag_val=tag_lower))
+                    else:
+                        query = query.filter(tag_clause)
 
                 order_by = filter.get('order_by')
                 direction = filter.get('direction')
 
                 if order_by == 'name':
                     if direction == 'asc':
-                        stmt = stmt.order_by(Prompt.name.asc())
+                        query = query.order_by(Prompt.name.asc())
                     else:
-                        stmt = stmt.order_by(Prompt.name.desc())
+                        query = query.order_by(Prompt.name.desc())
                 elif order_by == 'created_at':
                     if direction == 'asc':
-                        stmt = stmt.order_by(Prompt.created_at.asc())
+                        query = query.order_by(Prompt.created_at.asc())
                     else:
-                        stmt = stmt.order_by(Prompt.created_at.desc())
+                        query = query.order_by(Prompt.created_at.desc())
                 elif order_by == 'updated_at':
                     if direction == 'asc':
-                        stmt = stmt.order_by(Prompt.updated_at.asc())
+                        query = query.order_by(Prompt.updated_at.asc())
                     else:
-                        stmt = stmt.order_by(Prompt.updated_at.desc())
+                        query = query.order_by(Prompt.updated_at.desc())
                 else:
-                    stmt = stmt.order_by(Prompt.updated_at.desc())
+                    query = query.order_by(Prompt.updated_at.desc())
             else:
-                stmt = stmt.order_by(Prompt.updated_at.desc())
+                query = query.order_by(Prompt.updated_at.desc())
 
             # Count BEFORE pagination
-            count_result = await db.execute(select(func.count()).select_from(stmt.subquery()))
+            count_result = await db.execute(select(func.count()).select_from(query.subquery()))
             total = count_result.scalar()
 
             if skip:
-                stmt = stmt.offset(skip)
+                query = query.offset(skip)
             if limit:
-                stmt = stmt.limit(limit)
+                query = query.limit(limit)
 
-            result = await db.execute(stmt)
+            result = await db.execute(query)
             items = result.all()
 
             prompt_ids = [prompt.id for prompt, _ in items]