Open Source BSD LLM Gateways

Bifrost is an LLM gateway designed to provide a unified OpenAI-compatible API front for many different model providers. It abstracts away the complexity of working directly with multiple backend providers (OpenAI, Anthropic, AWS Bedrock, Google Vertex, etc.), enabling you to plug in providers and switch between them without touching your client code. It is built to be high performance: in benchmark tests at 5,000 requests per second, it reportedly adds only microseconds of overhead and achieves perfect success rates with no failed requests. Bifrost supports features such as automatic fallback (failover between providers), load balancing across API keys/providers, and semantic caching to reduce latency and cost. It also includes observability with built-in metrics, tracing, logging, and supports governance features like rate limiting, access control, and cost budgeting. The architecture is modular: there is a core engine, plugin layers, and transport layers (HTTP APIs).

Chat Nio is described as a next-generation, all-in-one AI platform that serves as an end-to-end solution for both B2B and B2C use cases. It supports dozens of underlying AI providers (OpenAI, Claude, Stable Diffusion, DALL·E, Midjourney, and many Chinese models, etc.), giving users flexibility in backend selection and switching. It offers a full stack: model management, channel/provider integration, a model marketplace, caching, subscription and billing support, dashboard analytics, and a web/admin UI. The platform supports model caching so repeated queries or similar inputs may be accelerated, and has mechanisms for elastic billing/subscription models to monetize usage. CoAI also supports “cloud sync,” allowing user settings or data to sync across deployments, and “preset” configurations to streamline user experiences.

Portkey AI Gateway aims to offer a blazing fast, secure, and flexible gateway for interacting with a wide variety of models and enforcing guardrails. It presents a single, friendly API through which you can route to 200+ LLMs, while applying configurable input/output guardrails to enforce policies or restrict certain content. It supports automatic retries, fallbacks, load balancing across providers or keys, and request timeouts to avoid latency spikes. The gateway is multimodal: it can handle text, vision, audio, and image models under a common interface. It also offers features for governance: role-based access, compliance with standards (SOC2, HIPAA, GDPR), secure key management, and logging/analytics of usage, latency, errors, and cost. The system integrates with agent frameworks like LangChain, Autogen, and others, enabling the building of more complex AI applications. It’s lightweight and optimized for low latency with a small footprint.