Adopt
OpenCode (SST) is the leading open-source coding agent (MIT license) - and the provider-neutral counterpart to Claude Code and OpenAI Codex.
Key Features
- Provider-agnostic: works with 75+ model providers including local models - no vendor subscription required, models are billed separately (or run on your own hardware).
- Terminal UI as the core, plus desktop app and IDE extension; LSP integration for language-aware edits.
- Plan/build modes: plan mode is read-only for reviewing the agent's approach before it touches files.
- Privacy stance: no storage of code or context by the tool vendor.
- Optional "Zen" offering: curated, benchmarked model access with pay-as-you-go pricing.
Assessment
The strongest option when model neutrality, data sovereignty, privacy or cost control matter - including fully local setups with open-weight models.
Related: Harness Engineering, Ollama for local model serving