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backend/app/services/llm/router.py

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+"""LLM provider factory - returns provider by config."""
+
+from app.config import get_settings
+from app.services.llm.base import BaseLLMProvider
+from app.services.llm.openai_vision import OpenAIVisionProvider
+from app.services.llm.claude_vision import ClaudeVisionProvider
+from app.services.llm.deepseek_vision import DeepSeekVisionProvider
+from app.services.llm.custom_openai_vision import CustomOpenAICompatibleProvider
+
+
+def get_llm_provider() -> BaseLLMProvider:
+    settings = get_settings()
+    provider = (settings.llm_provider or "openai").lower()
+    if provider == "openai":
+        return OpenAIVisionProvider()
+    if provider == "anthropic":
+        return ClaudeVisionProvider()
+    if provider == "deepseek":
+        return DeepSeekVisionProvider()
+    if provider == "custom_openai":
+        return CustomOpenAICompatibleProvider()
+    return OpenAIVisionProvider()