Best LLM Routers for Aider

OpenRouter is a unified AI inference platform that lets developers connect to a large catalog of models without integrating separately with every model provider. Through one API, users can access models from major AI companies including OpenAI, Google, Anthropic, Meta, Mistral, DeepSeek, Qwen, xAI, and numerous independent providers. The service supports multimodal workloads involving text, images, video, and audio. Developers can use a single account, credit balance, and API key across supported models instead of maintaining separate billing relationships and credentials. OpenRouter's routing infrastructure can prioritize providers based on factors such as price, latency, and reliability. Requests can also be redirected to alternate providers when a preferred endpoint becomes unavailable, helping applications maintain higher uptime. Organizations can configure data policies that restrict prompts to approved models and infrastructure providers. The platform provides benchmarks, model rankings, usage information, documentation, and developer tools for evaluating and deploying different models. OpenRouter is OpenAI API compatible, making it easier for teams to add broad model access to existing AI applications with limited integration changes.

Septor Labs offers a hosted AI gateway and model routing solution designed for developers who are creating AI agents, copilots, and applications powered by language models. It features a unified API that allows for the routing of requests to various supported models based on priority, weight, active connections, or latency considerations. Users have the option to choose a specific model or enable automatic selection, activate semantic caching, and set up API keys with distinct credit limits and optional IP whitelisting. The platform accommodates both OpenAI-style and Anthropic-style request formats, enabling compatible clients to access the service through a common gateway. Additionally, a web console is available for managing models and monitoring usage, while a prepaid credit system facilitates a pay-as-you-go billing approach. Overall, Septor Labs is tailored for developers and teams looking to seamlessly integrate advanced language model functionalities into their agents, copilots, and various software solutions, enhancing their capabilities and efficiency. With these features, the platform ensures that users can optimize their AI development processes effectively.

LowRouter serves as a European AI gateway designed for agents and applications, offering a single API key and a consolidated bill in euros for language models sourced from both European and global providers. Users can establish routing rules tailored to each API key, allowing for options such as exclusive use of EU-sovereign providers, routing that prioritizes lower carbon emissions, cost-effective routing, or any combination thereof. The responses generated include details about the provider and its region, along with an estimated carbon footprint when the model's data allows for such reporting. Coding agents like OpenCode, Claude Code, and Cline have the option to utilize LowRouter as a custom provider, while applications developed with LangChain or the OpenAI SDK can also integrate seamlessly. With the use of aliases, switching between models or providers can be accomplished without modifying the underlying code, and the automatic routing feature ensures that eligible requests are redirected to alternate providers in the event of a route failure. Users can explore the public model catalogue, which is searchable by factors such as sovereignty and carbon intensity. Billing for tokens is done at the rates set by providers without any additional per-token markup; however, there are fees associated with credit top-ups, and the service does not require a subscription. LowRouter is managed by Carbonifer SAS, which is based in Nantes, France, ensuring a dedicated focus on both sustainability and user-friendly access. Additionally, the platform is continuously evolving to meet the needs of its users in a rapidly changing technological landscape.