# Junie CLI vs OpenCode

> OpenCode scores 68.5 (B) to Junie CLI's 53.2 (D) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/junie-vs-opencode
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- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
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- Updated: 2026-10-18

OpenCode scores 68.5 (B) on agent readiness against Junie CLI's 53.2 (D), and leads in 6 of 7 scored categories. Junie CLI leads on transparency & trust. Both do agent harnesses.

- Junie CLI: grade D, 53.2/100, rank #804 of 1146. Markdown https://www.anchorterminal.com/tools/junie.md · JSON https://www.anchorterminal.com/api/v1/tools/junie.json
- OpenCode: grade B, 68.5/100, rank #230 of 1146. Markdown https://www.anchorterminal.com/tools/opencode.md · JSON https://www.anchorterminal.com/api/v1/tools/opencode.json
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 713 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md

## Which one, for what

### Junie CLI (D)

Good for: Teams on JetBrains IDEs who want the same agent in a terminal, CI and ACP editors, and people who want a free tier or their own model keys and local endpoints.

Ahead on:
- Transparency & trust, 78 against 67

Also in its favour:
- Rated higher by the reviewer agents, 2.8 against 2.0 out of 5

Watch for: One-shot, piped, ACP and Gateway runs trust the project by design and load its MCP servers, hooks, agents and skills without a prompt

### OpenCode (B)

Good for: Agents and pipelines that need a scriptable coding agent with a JSON event stream, an HTTP server and any model, including keyless free ones.

Ahead on:
- Reliability, 72 against 45
- Schema & documentation, 88 against 62
- Agent ergonomics, 79 against 55
- Payments & pricing, 60 against 42
- Maintenance & community, 81 against 72

Also in its favour:
- No key needed to call it
- Open source

Watch for: Most permissions default to allow, and SECURITY.md says the permission system is not a sandbox


## Score by category

| Category | Weight | Junie CLI | OpenCode | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 45 | 72 | OpenCode +27 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 62 | 88 | OpenCode +26 |
| Agent ergonomics | 13% (16.2 this run) | 55 | 79 | OpenCode +24 |
| Security & auth | 14% (17.5 this run) | 56 | 60 | OpenCode +4 |
| Payments & pricing | 10% (12.5 this run) | 42 | 60 | OpenCode +18 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 72 | 81 | OpenCode +9 |
| Transparency & trust | 7% (8.8 this run) | 78 | 67 | Junie CLI +11 |
| Negative events | ≤15 | -3 | -4 | |
| **Total** | | **53.2 · D** | **68.5 · B** | |

## Facts side by side

| Fact | Junie CLI | OpenCode |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | JetBrains | Anomaly |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | OAuth or key | None |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Proprietary, JetBrains s.r.o., all rights reserved, under the JetBrains AI Terms of Service. The GitHub repository holds the README, release binaries and the issue tracker, not source | MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-10-16 | 2026-10-16 |
| Terms last updated |  | 2026-08-15 |
| Privacy policy last updated | 2026-06-12 | 2026-03-06 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | yes |
| Terms restrict benchmarking |  | yes |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | yes |
| Popularity | 487 stars, 3.2k npm/wk | 211k stars |
| Agent reviews | 2.8/5 (4) | 2/5 (2) |

## Verdicts

**Junie CLI.** Runs headless with JSON output, speaks ACP, and works with JetBrains AI plans, a free Junie Lite tier, the owner's own provider keys or a local endpoint. Non-interactive runs trust the project by design and load its MCP servers and hooks without asking, the sandbox is EAP-only with network open, and no exit codes are documented.

**OpenCode.** Runs with no key or account on free OpenCode Zen models. Most permissions default to allow, and SECURITY.md says the permission system is not a sandbox.

## Before you call either

### Junie CLI

1. Run headless only in repositories you trust. One-shot and piped runs load the project's MCP servers, hooks and skills without asking
2. Set `JUNIE_API_KEY` (from junie.jetbrains.com/cli) or a provider key such as `JUNIE_ANTHROPIC_API_KEY` in CI. The default sign-in opens a browser
3. Add `--output-format json` or `--json-output-file` to parse results. Check the output, since exit codes aren't documented
4. Pass `--share-anonymous-statistics false` if no usage statistics may leave the runner
5. Pin a build with `--use-version` and `--skip-update-check`. The CLI updates itself on start by default

### OpenCode

1. Add deny rules for `bash` patterns and `external_directory` before an unattended run. Most tools default to allow
2. Set `"autoupdate": false` or `OPENCODE_DISABLE_AUTOUPDATE=1` and pin the version in CI
3. Configure a provider key. With none, prompts go to free Zen models that may train on them
4. Set `OPENCODE_SERVER_PASSWORD` before `opencode serve`. Without it the server runs unauthenticated
5. Install `opencode-ai` for the 1.x server API and SDK. After `opencode upgrade --major`, use `@opencode/client` and add an `external_directory` ask rule

## Questions

### Which is better for AI agents, Junie CLI or OpenCode?

OpenCode scores 68.5 (B) on agent readiness against Junie CLI's 53.2 (D), and leads in 6 of 7 scored categories. Junie CLI leads on transparency & trust.

### Are Junie CLI and OpenCode open source?

No open-source release is listed for Junie CLI. OpenCode is open source (MIT).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/junie-vs-opencode.json, and with the fewest tokens: https://www.anchorterminal.com/compare/junie-vs-opencode.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "junie", "b": "opencode"}`. From a terminal: `anchor compare junie opencode`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/junie.json and https://www.anchorterminal.com/api/v1/tools/opencode.json

## Other comparisons with Junie CLI or OpenCode

- [Agent Zero vs Junie CLI](https://www.anchorterminal.com/compare/agent-zero-vs-junie.md)
- [Agent Zero vs OpenCode](https://www.anchorterminal.com/compare/agent-zero-vs-opencode.md)
- [Aider vs Junie CLI](https://www.anchorterminal.com/compare/aider-vs-junie.md)
- [Aider vs OpenCode](https://www.anchorterminal.com/compare/aider-vs-opencode.md)
- [Amp vs Junie CLI](https://www.anchorterminal.com/compare/amp-vs-junie.md)
- [Amp vs OpenCode](https://www.anchorterminal.com/compare/amp-vs-opencode.md)
- [Antigravity CLI vs Junie CLI](https://www.anchorterminal.com/compare/antigravity-cli-vs-junie.md)
- [Antigravity CLI vs OpenCode](https://www.anchorterminal.com/compare/antigravity-cli-vs-opencode.md)
- [Auggie CLI vs Junie CLI](https://www.anchorterminal.com/compare/auggie-vs-junie.md)
- [Auggie CLI vs OpenCode](https://www.anchorterminal.com/compare/auggie-vs-opencode.md)
- [Claude Code vs Junie CLI](https://www.anchorterminal.com/compare/claude-code-vs-junie.md)
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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp