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Bifrost is a high-performance AI gateway that unifies access to 20+ providers OpenAI, Anthropic, AWS Bedrock, Google Vertex, Azure, and more, through a unified API. Deploy in seconds with zero configuration and get automatic failover, load balancing, semantic caching, and enterprise-grade governance. In sustained benchmarks at 5,000 requests per second, Bifrost adds only 11 µs of overhead per request.
Bifrost architecture diagram

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Open source features

Drop-in Replacement

Replace existing AI SDK connections by changing just the base URL. Keep your code, gain fallbacks and governance.

Automatic Fallbacks

Seamless failover between providers and models. When your primary provider fails, Bifrost switches to backups automatically.

Load Balancing

Intelligent API key distribution with weighted load balancing, model-specific filtering, and automatic failover.

Virtual Keys

The primary governance entity. Control access permissions, budgets, rate limits, and routing per consumer.

Routing

Direct requests to specific models, providers, and keys. Implement weighted strategies and automatic fallbacks.

Budget & Rate Limits

Hierarchical cost control with budgets and rate limits at virtual key, team, and customer levels.

MCP Tool Filtering

Control which MCP tools are available per virtual key with strict allow-lists.

Semantic Caching

Intelligent response caching based on semantic similarity. Reduce costs and latency for similar queries.

Built-in Observability

Monitor every AI request in real-time. Track performance, debug issues, and analyze usage patterns.

Prometheus Metrics

Native Prometheus metrics via scraping or Push Gateway for monitoring and alerting.

OpenTelemetry

OTLP integration for distributed tracing with Grafana, New Relic, Honeycomb, and more.

Telemetry

Built-in Prometheus-based monitoring tracking HTTP-level and upstream provider metrics.

Custom Plugins

Extensible middleware architecture. Build Go or WASM plugins for custom logic.

Mocker Plugin

Mock AI provider responses for testing, development, and simulation.

MCP Gateway

Enable AI models to discover and execute external tools dynamically via the Model Context Protocol. Bifrost acts as both an MCP client and server, connecting to external tool servers and exposing tools to clients like Claude Desktop.

Enterprise features

Advanced capabilities for teams running production AI systems at scale. Enterprise deployments include private networking, custom security controls, and governance features designed for enterprise-grade reliability.

SDK integrations

Use Bifrost as a drop-in replacement for popular AI SDKs with zero code changes — just update the base URL.

Supported providers

Bifrost supports 20+ AI providers through a single unified API. Configure multiple providers and Bifrost handles routing, failover, and load balancing automatically. See the full provider support matrix for detailed capability comparisons.