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Head to head · Agent harnesses · October 2026 research run

Devin vs Muse Code

Muse Code scores 61.3 (C) on agent readiness against Devin's 55.7 (C), and leads in 4 of 7 scored categories. Devin leads on security & auth and transparency & trust. Both do agent harnesses.

Best agent harnesses and coding agents · All 226 harnesses comparisons

DevinCognition AI, Inc. · Agent harness C55.7/100#668 of 993 Muse CodeMeta · Agent harness C61.3/100#487 of 993

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

  • Security & auth, 72 against 67
  • Transparency & trust, 69 against 57

Also in its favour

  • A hosted endpoint, with nothing to install

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

Muse Code C

Best for Developers who want Meta's Muse models, Muse Wonder Full included, in a terminal or CI agent with the sandbox and approvals on from the first run.

Ahead on

  • Reliability, 45 against 30
  • Agent ergonomics, 79 against 62
  • Maintenance & community, 75 against 63

Watch for

Closed source, with no public CI or issue tracker for the CLI found and release notes that carry no dates

Score by category

CategoryWeight this runDevinMuse CodeEdge
Reliability16%203045Muse Code +15
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28084Muse Code +4
Agent ergonomics13%16.26279Muse Code +17
Security & auth14%17.57267Devin +5
Payments & pricing10%12.52020even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86375Muse Code +12
Transparency & trust7%8.86957Devin +12
Negative events≤1500
TotalC 55.7/100C 61.3/100

Facts side by side

FactDevinMuse Code
KindAgent harnessAgent harness
VendorCognition AI, Inc.Meta
Hosted endpointhttps://mcp.devin.ai/mcpno (local only)
TransportsHTTP
AuthAPI keyOAuth or key
PricingFreemiumPaid
x402nono
LicenceProprietary service under Cognition's Platform Terms of ServiceProprietary binary, used under the Meta Model API Terms of Service, which cover Meta's coding harness. Subscriptions are also under the Meta Subscription Terms of Service. The TypeScript and Python SDKs in the linked repository are MIT.
Tools exposed13none
Read-only variant documentedyesyes
llms.txtyesyes
Last release2026-10-072026-10-11
Terms last updated2026-06-30
Privacy policy last updated2026-03-09couldn't be read
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
Popularitynone63k npm/wk

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.

Muse Code

Muse Code runs with approvals and an OS sandbox on by default, per-host network approval, an append-only event log and a headless mode with documented exit codes. It is the only route to Muse Wonder Full. It is closed source with undated release notes and no free route, and subscriptions allow training on code unless Contributor mode is turned off.

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

Muse Code

  1. Set META_API_KEY for headless runs. Browser sign-in isn't available in CI or for Meta Managed Accounts
  2. Gate on your own test command, not the exit code. muse exec returns 0 when the turn completes even if tests still fail
  3. Pass --max-model-steps on unattended runs so a stuck task can't loop
  4. Prefer --disable-approval to --yolo in CI so the sandbox stays on. On Linux the runner needs a working bubblewrap and a non-musl build
  5. Turn Contributor mode off in /settings before a subscription session touches private code

Questions

Which is better for AI agents, Devin or Muse Code?

Muse Code scores 61.3 (C) on agent readiness against Devin's 55.7 (C), and leads in 4 of 7 scored categories. Devin leads on security & auth and transparency & trust.

Other comparisons with Devin or Muse Code

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