OpenCode

The most-starred open-source terminal coding agent

Free CLI (BYO key) · Go $5 first month, then $10/mo open-sourceterminal-agentmodel-agnostic

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8.6 /10 Expert Score

Features

Pricing

Ecosystem

Performance

About

OpenCode is an MIT-licensed terminal AI coding agent maintained by Anomaly (the company formerly called SST, also behind OpenNext and OpenTUI). It has become the most-starred coding agent on GitHub with more than 187,000 stars and roughly 900 contributors — more stars than Claude Code — and it is the clearest example of the open, model-agnostic approach: the agent itself is free, and you bring whatever model you want. Mechanically it runs in a terminal UI (with a beta desktop app, IDE extension and web UI around it), ships two agents you toggle with Tab — build, which has full file and shell access, and plan, which is read-only and asks before running shell commands — and auto-loads the language server for your project so the model sees real diagnostics and symbols instead of guessing from text. It reaches 75+ model providers through Models.dev, including local models, and can sign in with an existing GitHub Copilot or ChatGPT Plus/Pro subscription, so you may not need to pay anything extra at all. Code and context are not stored by the vendor. Pricing follows that philosophy: the CLI is $0 and open source, the optional Go subscription is $5 for the first month then $10/month for 15 open coding models (capped at $12 per 5 hours, $30 per week, $60 per month, one subscriber per workspace), and Zen is a pay-as-you-go gateway across 50+ models that auto-tops up $20 when your balance drops below $5. Enterprise is seat-priced and quote-only, and can be restricted to an internal AI gateway with no token fee. Watch the BYO-key path: there is no built-in per-session spend cap, so a long run on a frontier model can get expensive. One naming note: the original OpenCode by Kujtim Hoxha moved to Charm and became Crush; the team holding the domain rewrote the agent in TypeScript, which is the project described here.

Key Features

Terminal UI agent with build and read-only plan modes
75+ providers via Models.dev, including Ollama and other local models
Sign-in with existing GitHub Copilot / ChatGPT Plus subscriptions
Automatic LSP loading for real symbol and diagnostic context
Optional Go subscription and Zen pay-as-you-go gateway
Local-first privacy — vendor stores no code or context

Deals, Discounts & How to Save

MIT-licensed agent, no seat fee and no vendor lock-inSign in with your existing GitHub Copilot or ChatGPT Plus/Pro subscription instead of buying API creditsGo at $10/mo hard-caps spend ($12/5h, $30/week, $60/month) on 15 open coding modelsEnterprises can point it at an internal AI gateway — no token fee from the vendor

OpenCode is free, so the only cost is model usage — and the cheapest path is often zero extra spend, because you can log in with a GitHub Copilot or ChatGPT Plus/Pro subscription you already pay for. When you do pay per token, route everyday work to local models or to the $10/month Go tier (hard-capped at $60/month) and keep frontier models for genuinely hard tasks.

Pros

Free, MIT-licensed and model-agnostic — 75+ providers including local models
Reuses an existing Copilot or ChatGPT subscription, so the marginal cost can be $0
Auto-loads the project language server, so the model sees real diagnostics
Most-starred coding agent on GitHub with a very active release cadence