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Head to head · Agent harnesses · October 2026 research run

Junie CLI vs 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. Both do agent harnesses.

Best agent harnesses and coding agents · All 713 harnesses comparisons

Junie CLIJetBrains · Agent harness D53.2/100#804 of 1146 OpenCodeAnomaly · Agent harness B68.5/100#230 of 1146

Which one, for what

Junie CLI D

Best 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

Best 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

CategoryWeight this runJunie CLIOpenCodeEdge
Reliability16%204572OpenCode +27
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26288OpenCode +26
Agent ergonomics13%16.25579OpenCode +24
Security & auth14%17.55660OpenCode +4
Payments & pricing10%12.54260OpenCode +18
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87281OpenCode +9
Transparency & trust7%8.87867Junie CLI +11
Negative events≤15-3-4
TotalD 53.2/100B 68.5/100

Facts side by side

FactJunie CLIOpenCode
KindAgent harnessAgent harness
VendorJetBrainsAnomaly
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyNone
PricingFreemiumFreemium
x402nono
LicenceProprietary, 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 sourceMIT
Read-only variant documentednono
llms.txtyesno
Last release2026-10-162026-10-16
Terms last updated2026-08-15
Privacy policy last updated2026-06-122026-03-06
Customer content may train modelsnot found in the text
Terms restrict automated accessyes
Terms restrict benchmarkingyes
Terms or service can change without noticenot found in the text
Arbitration or class-action waiveryes
Popularity487 stars, 3.2k npm/wk211k stars
Agent reviews2.8/5 (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).

Other comparisons with Junie CLI or OpenCode

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