Bifrost
An open-source agent gateway project built on the MCP protocol, designed to proxy multiple MCP servers to upstream AI models in a unified manner. It supports multi-tenant and remote deployment scenarios.
Core Facts
Timeline (last 90 days)
Alternatives to LiteLLM include Bifrost, OpenRouter (hosted, zero ops), Portkey (observability-first), and Tailscale's Aperture (supports running within a tailnet).
In a simple chat scenario at 5,000 req/s, Antirion's p50 overhead is 0.53 ms versus 19.7 ms for Bifrost 2.2.4, 37 times lower.
Under a light load of 1,000 req/s, Bifrost's p50 is 0.72 ms and Antirion's is 0.76 ms, putting the two at similar performance.
At 10,000 req/s, Bifrost's median request wait time reaches 12 seconds, while Antirion's p99 stays within 2 ms.
Antirion's maximum sustained throughput is 14,000 req/s versus 3,500 req/s for Bifrost.
At 5,000 req/s, Antirion's peak memory is 215 MiB versus 1,389 MiB for Bifrost.
Bifrost is a Go LLM gateway open-sourced by Maxim AI, integrating semantic caching, model fallback chains, virtual key budgets and observability.
The open-source Go gateway Bifrost maintains 11 microseconds of routing overhead at 5000 requests per second.
Bifrost's internal concurrency pattern relies on a Go worker pool and bounded channels; when the downstream channel fills up, it stops reading the upstream HTTP response body, causing the gateway's operating system to send a TCP zero-window signal to the upstream inference provider, and the upstream inference loop stalls.
Bifrost uses a sliding token window to evaluate streaming chunks, matching incoming text in flight against regex patterns and safety classifiers; if the stream begins outputting sensitive data, the gateway short-circuits the pipeline, terminates the stream with a downstream SSE error frame, and immediately cancels the upstream provider context.
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All Facts (20)
In testing, the p99 latency per 160-millisecond tick was 147.4–147.5 milliseconds, with zero missed deadlines across three rounds totaling 84,000 session ticks measured.
65%UnverifiedBifrost is an AI gateway that provides a unified OpenAI-compatible interface across hundreds of models and supports vendor failover and load balancing.
60%UnverifiedAlternatives to LiteLLM include Bifrost, OpenRouter (hosted, zero ops), Portkey (observability-first), and Tailscale's Aperture (supports running within a tailnet).
50%UnverifiedAt 5,000 req/s, Antirion's peak memory is 215 MiB versus 1,389 MiB for Bifrost.
50%UnverifiedIn a simple chat scenario at 5,000 req/s, Antirion's p50 overhead is 0.53 ms versus 19.7 ms for Bifrost 2.2.4, 37 times lower.
50%UnverifiedAntirion's maximum sustained throughput is 14,000 req/s versus 3,500 req/s for Bifrost.
50%UnverifiedUnder a light load of 1,000 req/s, Bifrost's p50 is 0.72 ms and Antirion's is 0.76 ms, putting the two at similar performance.
50%UnverifiedAt 10,000 req/s, Bifrost's median request wait time reaches 12 seconds, while Antirion's p99 stays within 2 ms.
50%UnverifiedBifrost is a Go LLM gateway open-sourced by Maxim AI, integrating semantic caching, model fallback chains, virtual key budgets and observability.
50%UnverifiedBifrost uses a sliding token window to evaluate streaming chunks, matching incoming text in flight against regex patterns and safety classifiers; if the stream begins outputting sensitive data, the gateway short-circuits the pipeline, terminates the stream with a downstream SSE error frame, and immediately cancels the upstream provider context.
50%UnverifiedBifrost's internal concurrency pattern relies on a Go worker pool and bounded channels; when the downstream channel fills up, it stops reading the upstream HTTP response body, causing the gateway's operating system to send a TCP zero-window signal to the upstream inference provider, and the upstream inference loop stalls.
50%UnverifiedThrough a single OpenAI-compatible interface, Bifrost can access more than 10,000 models from over 25 providers, covering OpenAI, Anthropic, AWS Bedrock, Google Vertex, Azure, Gemini, Groq, Mistral, Cohere, xAI, as well as self-hosted options such as vLLM, SGLang and Ollama.
50%UnverifiedBifrost is an open-source AI gateway built in Go, with its core under the Apache 2.0 license, and a paid enterprise edition offering identity management, high availability and support.
50%UnverifiedBifrost introduces a Virtual Key mechanism, where each caller gets a Virtual Key, budgets, rate limits and model permissions are attached to the key, and hierarchical enforcement is used so that a sub-team's budget does not exceed its parent's.
50%UnverifiedAccording to a case study published by Maxim, Bifrost's Code Mode reduced running cost from $377 to $29, a drop of about 92%, in a test spanning 16 MCP servers and 508 tools, while maintaining a 100% task pass rate.
50%UnverifiedBifrost's cluster mode uses peer-to-peer nodes with no single leader, sharing traffic patterns, rate limit state and provider health information via a gossip protocol.
50%UnverifiedBifrost has obtained SOC 2 Type II, ISO 27001, HIPAA and GDPR compliance certifications.
50%UnverifiedBifrost Edge is an agent running on employee laptops that can route the AI traffic of desktop apps, browser AI and coding agents to the same gateway, a capability the other four of the five products compared in this article do not have.
50%UnverifiedBifrost emphasizes high-performance proxying and low latency.
50%UnverifiedBifrost supports 10,000+ models from 25+ vendors and provides an OpenAI-compatible API, allowing existing applications to integrate by simply changing the API base URL.
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