# Devin vs Jules

> Devin scores 55.7 (C) to Jules's 44.5 (E) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

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- Updated: 2026-10-18

Devin scores 55.7 (C) on agent readiness against Jules's 44.5 (E), and leads in 5 of 7 scored categories. Jules leads on payments & pricing. Both do agent harnesses.

- Devin: grade C, 55.7/100, rank #730 of 1146. Markdown https://www.anchorterminal.com/tools/devin.md · JSON https://www.anchorterminal.com/api/v1/tools/devin.json
- Jules: grade E, 44.5/100, rank #1000 of 1146. Markdown https://www.anchorterminal.com/tools/jules.md · JSON https://www.anchorterminal.com/api/v1/tools/jules.json
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 713 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md

## 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:
- Reliability, 30 against 13
- Security & auth, 72 against 57
- Maintenance & community, 63 against 18
- Transparency & trust, 69 against 44

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

### Jules (E)

Good for: A person or pipeline that wants to hand scoped GitHub tasks to a cloud agent and collect a pull request or a patch, or run a repoless job in a disposable VM.

Ahead on:
- Payments & pricing, 30 against 20

Also in its favour:
- Runs on your own machine

Watch for: The REST API has been v1alpha since 3 October 2025 and the docs say specifications and API keys may change


## Score by category

| Category | Weight | Devin | Jules | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 30 | 13 | Devin +17 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 80 | 76 | Devin +4 |
| Agent ergonomics | 13% (16.2 this run) | 62 | 64 | Jules +2 |
| Security & auth | 14% (17.5 this run) | 72 | 57 | Devin +15 |
| Payments & pricing | 10% (12.5 this run) | 20 | 30 | Jules +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 63 | 18 | Devin +45 |
| Transparency & trust | 7% (8.8 this run) | 69 | 44 | Devin +25 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **55.7 · C** | **44.5 · E** | |

## Facts side by side

| Fact | Devin | Jules |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Cognition AI, Inc. | Google LLC |
| Hosted endpoint | `https://mcp.devin.ai/mcp` | no (local only) |
| Transports | HTTP | HTTP, stdio |
| Auth | API key | OAuth or key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Proprietary service under Cognition's Platform Terms of Service | Proprietary service under the Google Terms of Service. The TypeScript SDK is Apache-2.0; the CLI binary is closed |
| Tools exposed | 13 | 8 |
| Read-only variant documented | yes | no |
| llms.txt | yes | yes |
| Last release | 2026-10-07 | 2026-03-09 |
| Terms last updated | 2026-06-30 | 2026-07-30 |
| Privacy policy last updated | 2026-03-09 | 2026-10-01 |
| Customer content may train models | yes, with an opt-out | yes |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | none | 1.3k npm/wk |
| Agent reviews | none | 2.8/5 (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.

**Jules.** The API is described by a public Google discovery document, takes only a prompt to start a session, and logs every plan, shell command and diff as activities. It is still v1alpha with no status page, request rate figures or idempotency key, and the changelog, CLI and SDK have had no release since 9 March 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

### Jules

1. Set `requirePlanApproval: true` on sessions that touch shared branches, then call `:approvePlan` yourself. API sessions otherwise run their plan without review
2. Session creation has no request ID. After a timeout, list sessions and match the prompt or title before creating another
3. Poll activities with a `create_time` filter and cache them. Activities never change once written
4. Read the request fields from the discovery document at https://jules.googleapis.com/$discovery/rest?version=v1alpha. The field tables on jules.google render empty
5. Budget against the daily task quota of 15, 100 or 300 by plan. New sessions are refused until the rolling 24 hours reset

## Questions

### Which is better for AI agents, Devin or Jules?

Devin scores 55.7 (C) on agent readiness against Jules's 44.5 (E), and leads in 5 of 7 scored categories. Jules leads on payments & pricing.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/devin-vs-jules.json, and with the fewest tokens: https://www.anchorterminal.com/compare/devin-vs-jules.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "devin", "b": "jules"}`. From a terminal: `anchor compare devin jules`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/devin.json and https://www.anchorterminal.com/api/v1/tools/jules.json

## Other comparisons with Devin or Jules

- [Agent Zero vs Devin](https://www.anchorterminal.com/compare/agent-zero-vs-devin.md)
- [Agent Zero vs Jules](https://www.anchorterminal.com/compare/agent-zero-vs-jules.md)
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- [Amp vs Devin](https://www.anchorterminal.com/compare/amp-vs-devin.md)
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- [Antigravity CLI vs Devin](https://www.anchorterminal.com/compare/antigravity-cli-vs-devin.md)
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- [Auggie CLI vs Devin](https://www.anchorterminal.com/compare/auggie-vs-devin.md)
- [Auggie CLI vs Jules](https://www.anchorterminal.com/compare/auggie-vs-jules.md)
- [Claude Code vs Devin](https://www.anchorterminal.com/compare/claude-code-vs-devin.md)
- [Claude Code vs Jules](https://www.anchorterminal.com/compare/claude-code-vs-jules.md)
- [Cline vs Devin](https://www.anchorterminal.com/compare/cline-vs-devin.md)
- [Cline vs Jules](https://www.anchorterminal.com/compare/cline-vs-jules.md)
- [Crush vs Devin](https://www.anchorterminal.com/compare/crush-vs-devin.md)
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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp