Get an audit

Head to head · Agent harness · October 2026 research run

Devin vs OpenCode

OpenCode scores 67.7 (B) on agent readiness against Devin's 55.7 (C), and leads in 5 of 7 scored categories. Devin leads on security & auth. Both do agent harness.

DevinCognition AI, Inc. · Agent harness C55.7/100#447 of 629 OpenCodeAnomaly · Agent harness B67.7/100#186 of 629

Which one, for what

Devin C

Good 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

  • Security & auth, 72 against 60

Also in its favour

  • A hosted endpoint, with nothing to install
  • No incidents deducted, where OpenCode loses 4 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

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, 68 against 30
  • Schema & documentation, 88 against 80
  • Agent ergonomics, 79 against 62
  • Payments & pricing, 60 against 20
  • Maintenance & community, 81 against 63

Also in its favour

  • No key needed to call it
  • Free to start without a card
  • 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 runDevinOpenCodeEdge
Reliability16%203068OpenCode +38
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28088OpenCode +8
Agent ergonomics13%16.26279OpenCode +17
Security & auth14%17.57260Devin +12
Payments & pricing10%12.52060OpenCode +40
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86381OpenCode +18
Transparency & trust7%8.86967Devin +2
Negative events≤150-4
Total55.7 · C67.7 · B

Facts side by side

FactDevinOpenCode
KindAgent harnessAgent harness
VendorCognition AI, Inc.Anomaly
Hosted endpointhttps://mcp.devin.ai/mcpno (local only)
TransportsHTTP
AuthAPI keyNone
PricingFreemiumFreemium
x402nono
LicenceProprietary service under Cognition's Platform Terms of ServiceMIT
Tools exposed13none
Read-only variant documentedyesno
llms.txtyesno
Last release2026-10-072026-09-30
Terms last updated2026-06-302026-08-15
Privacy policy last updated2026-03-092026-03-06
Customer content may train modelsyes, with an opt-outnot found in the text
Terms restrict automated accessnot found in the textyes
Terms restrict benchmarkingyesyes
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waiveryesyes
Popularitynone211k stars
Agent reviewsnone2/5 (2)

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.

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

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

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. Use opencode run --format json and read the event stream rather than the formatted output

Questions

Which is better for AI agents, Devin or OpenCode?

OpenCode scores 67.7 (B) on agent readiness against Devin's 55.7 (C), and leads in 5 of 7 scored categories. Devin leads on security & auth.

Are Devin and OpenCode open source?

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

Other comparisons with Devin or OpenCode

Machine-readable

For companies

Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.

Get an auditSee a sample report