OpenCode 2.2.3 adds a built-in Claude Agent provider that runs Claude models through your own Claude Code login, subscriptions included

Background

Many developers already pay for a Claude subscription, but that quota mostly lived inside Claude Code; using an open-source agent such as OpenCode meant setting up a separate pay-as-you-go API key. Third-party tools like T3 Code had already started connecting to users' own Claude Code logins through the Claude Agent SDK, and OpenCode now follows with a built-in provider. Before the release, OpenCode team member dax (@thdxr, whose bio says he builds @opencode at @anomalyco) asked on X "what if you could use your claude subscription in opencode", drawing about 2,300 likes and 280 replies.

How it works

According to the official design spec, OpenCode does not call Anthropic's API itself. It starts the user's local claude program through Anthropic's public Claude Agent SDK, never reads its saved login and never rewrites its requests. The key choice is to treat Claude Code as just another model provider: its built-in tools, CLAUDE.md, hooks, MCP servers, skills, auto compaction, auto memory and advisor tool are all off, and Claude may only call OpenCode's tools, exposed over MCP, under OpenCode's single permission system. That keeps session history model-agnostic; when you switch away from Claude and back, only the part Claude has not seen is sent. The trade-offs are that tool calls run one at a time, and each session holds one claude process that stops after 5 idle minutes and resumes on the next message.

Benchmarks

OpenCode has published no speed, cost or success-rate comparison between the Claude Agent provider and native Claude Code or direct API use. The spec only documents behavior: Claude Code's own system prompt plus a short OpenCode note, summarized thinking, and a requirement of Claude Code 2.1.248 or later.

Getting started

After updating to v2.2.3, install Claude Code, run claude auth login in a terminal, then run /connect in OpenCode and pick Claude Agent. Set OPENCODE_CLAUDE_PATH if claude is not on your PATH. Settings in ~/.claude and CLAUDE.md are ignored, so move them into OpenCode's AGENTS.md, skills and MCP config. Usage counts against your own Claude plan or account, so check your plan's terms first. The same release also speeds up long sessions in Desktop and includes breaking changes to @opencode/ai, so anyone importing that package directly should read the release notes.