add support for openrouter.

Signed-off-by: sahil suman <sahilsuman933@gmail.com>

src/pipecat/services/openrouter.py

@@ -0,0 +1,62 @@
+#
+# Copyright (c) 2025, Daily
+#
+# SPDX-License-Identifier: BSD 2-Clause License
+#
+
+from typing import Dict, List
+
+from loguru import logger
+
+from pipecat.processors.aggregators.openai_llm_context import OpenAILLMContext
+from pipecat.services.openai import OpenAILLMService
+
+try:
+    from openai import AsyncStream, OpenAI
+    from openai.types.chat import ChatCompletionChunk, ChatCompletionMessageParam
+except ModuleNotFoundError as e:
+    logger.error(f"Exception: {e}")
+    logger.error(
+        "In order to use OpenRouter, you need to `pip install pipecat-ai[openai]`. Also, set `OPENROUTER_API_KEY` environment variable."
+    )
+    raise Exception(f"Missing module: {e}")
+
+
+class OpenRouterLLMService(OpenAILLMService):
+    def __init__(
+        self,
+        *,
+        api_key: str | None = None,
+        model: str = "openai/gpt-4o-latest",
+        base_url: str = "https://openrouter.ai/api/v1",
+        **kwargs,
+    ):
+        super().__init__(
+            api_key=api_key,
+            base_url=base_url,
+            model=model,
+            **kwargs,
+        )
+
+    def create_client(self, api_key=None, base_url=None, **kwargs):
+        logger.debug(f"Creating OpenRouter client with api {base_url}")
+        return super().create_client(api_key, base_url, **kwargs)
+
+    async def get_chat_completions(
+        self, context: OpenAILLMContext, messages: List[ChatCompletionMessageParam]
+    ) -> AsyncStream[ChatCompletionChunk]:
+        params = {
+            "model": self.model_name,
+            "stream": True,
+            "messages": messages,
+            "temperature": self._settings["temperature"],
+            "top_p": self._settings["top_p"],
+            "max_tokens": self._settings["max_tokens"],
+            "frequency_penalty": self._settings["frequency_penalty"],
+            "presence_penalty": self._settings["presence_penalty"],
+        }
+
+        params.update(self._settings["extra"])
+
+        chunks = await self._client.chat.completions.create(**params)
+        return chunks