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Head to head · Agent harnesses · October 2026 research run

Devin vs OpenMausBot

OpenMausBot scores 65.4 (B) on agent readiness against Devin's 55.8 (C), and leads in 5 of 7 scored categories. Devin leads on security & auth and transparency & trust. Both do agent harnesses.

Best agent harnesses and coding agents · All 875 harnesses comparisons

DevinCognition AI, Inc. · Agent harness C55.8/100#773 of 1238 OpenMausBotSupamaus Software Private Limited · Agent harness B65.4/100#368 of 1238

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 59
  • Transparency & trust, 70 against 59

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

OpenMausBot B

Best for A person or an outside agent who wants several CLI agents (Claude Code, Codex, Grok, ACP CLIs) organised as named bots with their own computers, routines and approvals, driven by MCP or a CLI.

Ahead on

  • Reliability, 60 against 30
  • Schema & documentation, 90 against 80
  • Agent ergonomics, 77 against 62
  • Payments & pricing, 50 against 20
  • Maintenance & community, 74 against 63

Also in its favour

  • Runs on your own machine
  • Free to start without a card
  • Open source

Watch for

New bots start at Full access, which approves provider permission requests without a card

Score by category

CategoryWeight this runDevinOpenMausBotEdge
Reliability16%203060OpenMausBot +30
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28090OpenMausBot +10
Agent ergonomics13%16.26277OpenMausBot +15
Security & auth14%17.57259Devin +13
Payments & pricing10%12.52050OpenMausBot +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86374OpenMausBot +11
Transparency & trust7%8.87059Devin +11
Negative events≤150-2
TotalC 55.8/100B 65.4/100

Facts side by side

FactDevinOpenMausBot
KindAgent harnessAgent harness
VendorCognition AI, Inc.Supamaus Software Private Limited
Hosted endpointhttps://mcp.devin.ai/mcpno (local only)
TransportsHTTPstdio
AuthAPI keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceProprietary service under Cognition's Platform Terms of ServiceApache-2.0
Tools exposed1320
Read-only variant documentedyesno
llms.txtyesno
Last release2026-10-072026-10-30
Terms last updated2026-06-302026-10-10
Privacy policy last updated2026-03-092026-10-18
Customer content may train modelsyes, with an opt-outnot found in the text
Terms restrict automated accessnot found in the textnot found in the text
Terms restrict benchmarkingyesnot found in the text
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waiveryesnot found in the text
Popularitynone8.2k stars, 3.5k 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.

OpenMausBot

A bounded 20-tool MCP server with typed schemas, annotations and idempotent sends, and a headless CLI with JSON output and exit codes, let another agent hand work to a bot team and wait on it. New bots start at Full access, so provider permission requests pass without a card, and usage analytics stay on until switched 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

OpenMausBot

  1. Ask the owner for a pairing code from Settings > Phone, exchange it at POST /api/auth/pair, and set OPENMAUSBOT_TOKEN with an explicit OMB_PORT
  2. Pass a send_id with every send_bot_message and send_channel_message, so a retry returns the first receipt
  3. Use wait_for_conversation instead of polling, and on needs-user stop and tell the owner a card is waiting
  4. Check a bot's access level with the owner before sending work. New bots run at Full access unless defaults were changed
  5. Ask the owner to switch off Settings > General > Usage analytics if nothing beyond model calls should leave the machine

Questions

Which is better for AI agents, Devin or OpenMausBot?

OpenMausBot scores 65.4 (B) on agent readiness against Devin's 55.8 (C), and leads in 5 of 7 scored categories. Devin leads on security & auth and transparency & trust.

Are Devin and OpenMausBot open source?

No open-source release is listed for Devin. OpenMausBot is open source (Apache-2.0).

Other comparisons with Devin or OpenMausBot

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