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Building a Sub-Millisecond AI Gateway in Go for Autonomous Coding Agents

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When building workflows with autonomous coding agents (like Claude Code, Cursor, or OpenCode), agent execution loops issue dozens of rapid LLM calls per minute. Standard Python-based proxies introduce 40ms–100ms of latency per hop, balloon to hundreds of megabytes in memory, and easily choke during parallel agent streaming.

To solve this, I built GoRoute (https://github.com/ziuus/goroute) — an ultra-lightweight, high-throughput AI gateway and dynamic LLM router written in Go.

The Latency & Reliability Problem

In autonomous coding agent sessions:

  1. Compounding Proxy Latency: In a 30-step agent loop, 60ms of routing overhead adds 1.8 seconds of pure wait time.
  2. Provider Rate Limits: Hitting a 429 on Anthropic or OpenAI kills the entire agent trajectory unless failovers are instantaneous.
  3. Protocol Mismatches: Tool definitions and message schemas differ between OpenAI (function_call / tools) and Anthropic (messages API).

Architecture & Key Features

  • Sub-0.8ms Local Routing: Zero-allocation hot path, standard library HTTP + lightweight routing, baseline footprint <12MB RAM.
  • Universal Protocol Translation: Transparently translate OpenAI format to Anthropic messages format and vice-versa, allowing any coding tool to talk to any upstream model.
  • Dynamic Failover Cascades: If Claude 3.5 Sonnet hits rate-limits or 5xx errors, GoRoute cascades automatically to DeepSeek-V3 or GPT-4o with zero lost tokens.
  • Multi-Account Token Pooling: Distribute requests round-robin across multiple API keys to maximize quota without manual key rotation.
  • Native MCP Compatibility: Designed to sit cleanly alongside Model Context Protocol servers.

Quick Start

Run locally via Go:

go install github.com/ziuus/goroute@latest
goroute --port 8080 --config config.yaml
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Or via Docker:

docker run -p 8080:8080 -v $(pwd)/config.yaml:/app/config.yaml ghcr.io/ziuus/goroute:latest
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Point your agent or SDK to http://localhost:8080/v1 and you are ready.

Open Source

GoRoute is 100% open source under the MIT License.

Feedback, issue reports, and benchmarks are warmly welcomed! If you are building agentic tools or multi-model pipelines, give it a try.h

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