AntSeed runs a buyer proxy at http://localhost:8377 that speaks all four major LLM API protocols — Anthropic Messages, OpenAI Chat Completions, OpenAI Responses, and OpenAI Completions — and translates between them on the fly. Pick your tool below; AntSeed makes it fit. Each service on the network advertises which protocols it accepts natively in providerServiceApiProtocols — matching your tool's wire format to that list is the smoothest path.
Drop-in for Claude Code, Codex, and friends. Set one env var, keep your existing workflow.

Anthropic's official CLI agent — launch through AntSeed with `antseed claude`.

OpenAI's official CLI coding agent — use `antseed codex` for per-run proxy config.
Open-source AI coding agent — launch through AntSeed with `antseed opencode`.
Open-source terminal coding agent with a first-class AntSeed extension.
Long-running, autonomous workloads. Agents pick providers by price, latency, and reputation — no API keys, no SaaS account.
LangChain, Vercel AI SDK, GenLayer Studio, and other multi-provider frameworks. Add AntSeed as one of the providers.
The lowest-level contract. Use this if you're scripting, debugging, or building a new integration.
If your tool accepts an Anthropic or OpenAI base URL, AntSeed already works with it — see the raw HTTP page for the contract. Want it added here? Open a PR on integrations.ts.
Read the protocol guide, grab skill.md for your agent, and ping us in Telegram for partner verification.