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Nanocode-CLI vs OpenCode

Which one should you try?

Nanocode-CLI

Free

Best for Developers comfortable with terminal-based tools and TOML configuration

Visit Nanocode-CLI See full review

OpenCode

Free

Best for Developers who want an open-source coding agent in the terminal

Visit OpenCode See full review

Pricing, capabilities and platforms side by side. Prices are as of the "Pricing checked" date in the table.

Nanocode-CLI

Nanocode-CLI

The tool runs entirely in your terminal, talks to whatever LLM you point it at — local or remote — and edits files using line-and-hash anchors that reject a write if the target code has already drifted. That last detail matters more than it sounds: most agents will cheerfully overwrite a file that changed between the read and the write. nanocode refuses. The tradeoff is scope — the codebase is intentionally small, the feature surface is narrow, and teams who need a visual canvas, IDE integration, or a rich plugin ecosystem will hit the ceiling fast. For a restricted environment or a developer who wants to read every line of the agent loop before trusting it, that ceiling is the point.

OpenCode

OpenCode

OpenCode is an MIT-licensed AI coding agent for the terminal that works with the model provider you choose, including local models. We installed it and ran three agent tasks: 9 of 9 passed with Claude Opus 5.5, 3 of 9 with a 3B local model.

AttributeNanocode-CLIOpenCode
PricingFreeFree
Price—Free (MIT). Optional Zen models pay as you go; Go $10/mo, Go Plus $40/mo
Pricing checkedNot checked yetOct 19, 2026
Free trialNot statedNot stated
Open sourceYesYes
Has APINoYes
Self-hosted optionYesYes
PlatformsLinux, macOS, Windows (any platform with Python 3)Terminal, Desktop (beta macOS/Windows/Linux), IDE extension
Pros
  • Hash-anchored file edits reject writes when the target content has drifted since the last read, so the agent cannot silently overwrite code that changed mid-session — the failure mode that makes most autonomous edit loops dangerous in active codebases.
  • Provider-agnostic LLM configuration via TOML, so switching between a local model and a remote API is a config change, not a code change — and your source code never touches a vendor endpoint unless you explicitly route it there.
  • Live turn control lets you inject follow-up instructions while the agent is still running a tool sequence, so you can correct course without killing the session and losing the accumulated file-state context.
  • The entire agent is a single Python file under BSD-3-Clause, so auditing the full loop — what gets read, what gets written, what gets sent to the LLM — takes minutes, not a documentation deep-dive.
  • Bounded tool output with recallable raw results keeps long sessions from exploding the context window, which means multi-file refactors stay coherent instead of degrading into truncated hallucinations.
  • Passed all 9 of our agent tasks with Claude Opus 5.5.
  • Works with the provider you choose, including a local model behind an OpenAI-compatible server.
  • Open source under the MIT license.
Cons
  • The project is explicitly pre-1.0: the docs state that commands, configuration, and tool behavior may change before a stable release. Any team building a repeatable internal workflow on top of nanocode owns the migration cost every time a breaking change ships.
  • There is no GUI, no IDE plugin, and no visual canvas. Developers who do not work primarily in the terminal — or teams where non-engineering stakeholders need to interact with the agent — cannot use this tool as-is, and there is no integration path that changes that.
  • The feature surface is narrow by design. When a project requires agent-to-agent coordination, webhook triggers, a plugin marketplace, or approval workflows beyond the terminal prompt, teams switch to a full-framework alternative — at which point the single-file simplicity that made nanocode attractive is gone, and so is the tool.
  • With a 3B local model it passed 3 of 9 tasks (only the simplest one), so plan on a larger model.
  • It reaches out to models.opencode.ai and registry.npmjs.org, and downloads provider packages on first use, so offline setups need those pre-installed.
  • The vendor lists its desktop app as beta.

Made up your mind?

Nanocode-CLI

Free

Best for Developers comfortable with terminal-based tools and TOML configuration

Visit Nanocode-CLI See full review

OpenCode

Free

Best for Developers who want an open-source coding agent in the terminal

Visit OpenCode See full review

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Specs come from each tool's own site and docs (how we test). AIDiveForge is editorially independent.

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