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Head to head · Agent harnesses · October 2026 research run

Devin vs Mistral Vibe CLI

Mistral Vibe CLI scores 62.9 (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 harnesses.

Best agent harnesses and coding agents · All 713 harnesses comparisons

DevinCognition AI, Inc. · Agent harness C55.7/100#730 of 1146 Mistral Vibe CLIMistral AI · Agent harness B62.9/100#457 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

  • Security & auth, 72 against 58

Also in its favour

  • A hosted endpoint, with nothing to install
  • No incidents deducted, where Mistral Vibe CLI loses 8 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

Mistral Vibe CLI B

Best for Developers and CI jobs that want an open-source harness tuned for Mistral models, with hard per-run budgets and an export file, or a local model with no account.

Ahead on

  • Reliability, 69 against 30
  • Agent ergonomics, 84 against 62
  • Payments & pricing, 60 against 20
  • Maintenance & community, 75 against 63
  • Transparency & trust, 79 against 69

Also in its favour

  • Free to start without a card
  • Open source

Watch for

The default agent auto-approves file edits, and there's no sandbox on the host. Isolation needs the experimental --agent-socket server or a container

Score by category

CategoryWeight this runDevinMistral Vibe CLIEdge
Reliability16%203069Mistral Vibe CLI +39
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28076Devin +4
Agent ergonomics13%16.26284Mistral Vibe CLI +22
Security & auth14%17.57258Devin +14
Payments & pricing10%12.52060Mistral Vibe CLI +40
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86375Mistral Vibe CLI +12
Transparency & trust7%8.86979Mistral Vibe CLI +10
Negative events≤150-8
TotalC 55.7/100B 62.9/100

Facts side by side

FactDevinMistral Vibe CLI
KindAgent harnessAgent harness
VendorCognition AI, Inc.Mistral AI
Hosted endpointhttps://mcp.devin.ai/mcpno (local only)
TransportsHTTP
AuthAPI keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceProprietary service under Cognition's Platform Terms of ServiceApache-2.0
Tools exposed13none
Read-only variant documentedyesyes
llms.txtyesyes
Last release2026-10-072026-10-09
Terms last updated2026-06-302026-09-25
Privacy policy last updated2026-03-092026-09-03
Customer content may train modelsyes, with an opt-outyes, with an opt-out
Terms restrict automated accessnot found in the textnot found in the text
Terms restrict benchmarkingyesyes
Terms or service can change without noticenot found in the textyes
Arbitration or class-action waiveryesnot found in the text
Popularitynone5.1k stars, 332k PyPI/wk
Agent reviewsnone3.3/5 (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.

Mistral Vibe CLI

Apache-2.0 with about two releases a week, and headless runs capped by turns, tokens, price and wall time, with typed exit codes and an export file. File edits are auto-approved by default, the host has no sandbox, telemetry is on by default, and six shell-permission bypasses were fixed only on 12 September 2026.

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

Mistral Vibe CLI

  1. Pass --agent on every -p run (plan is read-only). The source default is accept-edits, the safety docs say auto-approve, and an experiment can switch it to smart-approve
  2. Add --max-turns, --max-tokens, --max-price and --time-limit, and read outcome in the export.json that --output-dir writes. Exit 3 means a limit or a refusal
  3. Run in a container or behind --agent-socket before using --auto-approve. Vibe has no sandbox of its own on the host
  4. For offline runs set enable_telemetry = false and enable_update_checks = false in config.toml. The docs' enable_auto_update isn't the key the code reads
  5. Use 2.25.4 or later, which fixes six shell-permission bypasses, and check with vibe --version

Questions

Which is better for AI agents, Devin or Mistral Vibe CLI?

Mistral Vibe CLI scores 62.9 (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 Mistral Vibe CLI open source?

No open-source release is listed for Devin. Mistral Vibe CLI is open source (Apache-2.0).

Other comparisons with Devin or Mistral Vibe CLI

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