{"slug": "switch-ai-models-without-rewriting-your-openai-sdk-integration", "title": "Switch AI Models Without Rewriting Your OpenAI SDK Integration", "summary": "RouterBase offers an OpenAI-compatible API that lets developers switch between 200+ AI models, including GPT, Claude, and Gemini, without rewriting their OpenAI SDK integration. By changing only the base URL and model ID, applications can route requests through RouterBase while keeping the same client code. The company recommends testing candidate models against consistent tasks and rubrics before moving production traffic.", "body_md": "If your application already uses the OpenAI Python SDK, you can keep the same client and point it at RouterBase by changing the base URL.\n\nThis gives the application one request interface while model selection stays configurable.\n\n`openai`\n\npackageInstall the SDK:\n\n```\npip install --upgrade openai\n```\n\nSet the key in your shell:\n\n```\nexport ROUTERBASE_API_KEY=\"sk-rb-...\"\n```\n\nDo not place an API key in browser code, mobile binaries, or a public repository.\n\n``` python\nimport os\nfrom openai import OpenAI\n\nclient = OpenAI(\n    api_key=os.environ[\"ROUTERBASE_API_KEY\"],\n    base_url=\"https://routerbase.com/v1\",\n)\n```\n\nThe important line is `base_url`\n\n. The SDK remains the same; requests go through the RouterBase OpenAI-compatible endpoint.\n\nChoose a model ID from the current RouterBase model catalog and keep it in configuration instead of hard-coding it throughout the application.\n\n``` python\nimport os\n\nmodel_id = os.environ.get(\n    \"ROUTERBASE_MODEL\",\n    \"google/gemini-2.5-flash\",\n)\n\nresponse = client.chat.completions.create(\n    model=model_id,\n    messages=[\n        {\n            \"role\": \"user\",\n            \"content\": \"Explain idempotency in one paragraph.\",\n        }\n    ],\n)\n\nprint(response.choices[0].message.content)\n```\n\nTo test a different compatible chat model, change `ROUTERBASE_MODEL`\n\nand run the same request again.\n\nA successful API response is not enough to justify moving production traffic. Test candidate models against the same tasks and rubric.\n\n```\ncandidates = [\n    \"google/gemini-2.5-flash\",\n    # Add other current RouterBase chat model IDs here.\n]\n\nprompt = \"Return a JSON object with keys: summary and risk.\"\n\nfor candidate in candidates:\n    result = client.chat.completions.create(\n        model=candidate,\n        messages=[{\"role\": \"user\", \"content\": prompt}],\n    )\n    print(candidate, result.choices[0].message.content)\n```\n\nIn a real evaluation, record correctness, latency, retry rate, and the cost of a successful task.\n\nAn OpenAI-compatible endpoint does not mean every model has identical behavior.\n\nBefore switching models, verify:\n\nKeep the integration stable, but keep the evaluation model-specific.\n\n[RouterBase](https://routerbase.com) provides one OpenAI-compatible API for GPT, Claude, Gemini, and 200+ AI models. Check the live catalog before using a model ID in production.", "url": "https://wpnews.pro/news/switch-ai-models-without-rewriting-your-openai-sdk-integration", "canonical_source": "https://dev.to/routerbase_com/switch-ai-models-without-rewriting-your-openai-sdk-integration-28gb", "published_at": "2026-07-16 02:17:58+00:00", "updated_at": "2026-07-16 03:06:12.865374+00:00", "lang": "en", "topics": ["developer-tools", "ai-infrastructure", "large-language-models"], "entities": ["RouterBase", "OpenAI", "GPT", "Claude", "Gemini"], "alternates": {"html": "https://wpnews.pro/news/switch-ai-models-without-rewriting-your-openai-sdk-integration", "markdown": "https://wpnews.pro/news/switch-ai-models-without-rewriting-your-openai-sdk-integration.md", "text": "https://wpnews.pro/news/switch-ai-models-without-rewriting-your-openai-sdk-integration.txt", "jsonld": "https://wpnews.pro/news/switch-ai-models-without-rewriting-your-openai-sdk-integration.jsonld"}}