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Head to head · Agent harnesses · October 2026 research run

Devin vs Junie CLI

Devin scores 55.7 (C) on agent readiness against Junie CLI's 53.2 (D), and leads in 3 of 7 scored categories. Junie CLI leads on reliability, payments & pricing, maintenance & community and transparency & trust. Both do agent harnesses.

Best agent harnesses and coding agents · All 713 harnesses comparisons

DevinCognition AI, Inc. · Agent harness C55.7/100#730 of 1146 Junie CLIJetBrains · Agent harness D53.2/100#804 of 1146

Which one, for what

Devin C

Best for A team that wants to hand whole tasks to a cloud agent and collect pull requests, driven from a pipeline or another agent.

Ahead on

  • Schema & documentation, 80 against 62
  • Agent ergonomics, 62 against 55
  • Security & auth, 72 against 56

Also in its favour

  • A hosted endpoint, with nothing to install
  • No incidents deducted, where Junie CLI loses 3 points for them

Watch for

www.devinstatus.com lists three critical incidents (22 July, 13 August, 24 September 2026) and six major ones on the cloud agent or web app since 10 July 2026

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

  • Reliability, 45 against 30
  • Payments & pricing, 42 against 20
  • Maintenance & community, 72 against 63
  • Transparency & trust, 78 against 69

Also in its favour

  • Free to start without a card

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

Score by category

CategoryWeight this runDevinJunie CLIEdge
Reliability16%203045Junie CLI +15
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28062Devin +18
Agent ergonomics13%16.26255Devin +7
Security & auth14%17.57256Devin +16
Payments & pricing10%12.52042Junie CLI +22
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86372Junie CLI +9
Transparency & trust7%8.86978Junie CLI +9
Negative events≤150-3
TotalC 55.7/100D 53.2/100

Facts side by side

FactDevinJunie CLI
KindAgent harnessAgent harness
VendorCognition AI, Inc.JetBrains
Hosted endpointhttps://mcp.devin.ai/mcpno (local only)
TransportsHTTP
AuthAPI keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceProprietary service under Cognition's Platform Terms of ServiceProprietary, 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
Tools exposed13none
Read-only variant documentedyesno
llms.txtyesyes
Last release2026-10-072026-10-16
Terms last updated2026-06-30
Privacy policy last updated2026-03-092026-06-12
Customer content may train modelsyes, with an opt-out
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticenot found in the text
Arbitration or class-action waiveryes
Popularitynone487 stars, 3.2k npm/wk
Agent reviewsnone2.8/5 (4)

Verdicts

Devin

The v3 API is well specified, with a public OpenAPI 3.1 file covering 239 operations, problem+json errors, cursor pagination and service-user keys tied to roles. The status page records three critical and several major incidents on the cloud agent between 22 July and 24 September 2026, and no rate limit figures or retry guidance were found in the reviewed documentation.

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.

Before you call either

Devin

  1. Use a cog_ service-user key with the Member role. Legacy apk_ keys fail against v3 and the MCP server with 401 or 403
  2. Set max_acu_limit on every session you create. Usage is metered by the work done and has no published unit rate
  3. Session creation is not idempotent in v3. After a timeout, list sessions by tag before creating again
  4. Enterprise keys and personal access tokens must send X-Org-Id to the MCP server. Organisation-scoped keys resolve it automatically
  5. Create scheduled work as an automation. POST to the schedules endpoint returns 403 for migrated organisations since 24 September 2026

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

Questions

Which is better for AI agents, Devin or Junie CLI?

Devin scores 55.7 (C) on agent readiness against Junie CLI's 53.2 (D), and leads in 3 of 7 scored categories. Junie CLI leads on reliability, payments & pricing, maintenance & community and transparency & trust.

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