Jules vs Devin (2026)

Jules

by Google

Devin

by Cognition

Pros

• ✓Fully autonomous asynchronous execution backed by Google: Jules runs in a Google Cloud VM in the background so developers can close their computer and return to completed pull requests hours later. Task-based pricing (15/100/300 daily tasks) aligns cost with output rather than seat time.
• ✓Google I/O 2026 GA launch with Gemini 3.1 Pro: Jules benefits from Google's frontier model investment with large context windows that handle entire codebases without retrieval augmentation. Over 140,000 code improvements were shipped during the beta period.
• ✓Android Studio CLI and Firebase integration enable fully automated loops: Jules can invoke build systems, emulators, and test runners programmatically, while Firebase AI Logic provides agent-native backend persistence with authentication, Firestore, and Cloud Functions.

Limitations

• ⚠Gmail accounts only for paid tiers: Google Workspace and enterprise accounts cannot access Pro or Ultra plans yet, which blocks adoption at organizations running Google Workspace as their primary account system.
• ⚠MCP integrations limited to vetted partners: Jules restricts MCP server connections to a security-vetted list (Linear, Stitch, Neon, Tinybird, Context7, Supabase), which limits workflow integrations versus tools with open MCP ecosystems like Cline, Goose, or OpenCode.
• ⚠Asynchronous-only execution creates workflow friction for tight iteration: Jules does not support synchronous IDE-embedded coding, so developers needing real-time interactive AI responses should evaluate Cursor or Claude Code alongside or instead of Jules.

Pros

• ✓Highest autonomous execution capability among coding agents: Cognition reports approximately 75% task completion on well-defined engineering tasks, handling the full loop from planning through implementation to pull request submission without developer supervision. Nubank documented 8 to 12x engineering efficiency gains on a multi-million line migration.
• ✓Devin Desktop (formerly Windsurf) IDE usage now bundled with all paid plans: Pro at $20/month includes both autonomous Devin Cloud sessions and Devin Desktop agentic coding, combining two distinct modes of AI-assisted development under a single subscription with no equivalent from Cursor, Claude Code, or GitHub Copilot.
• ✓Native Slack, Linear, and GitHub integrations on Pro tier: engineering teams can assign tasks directly from their existing workflow tools and receive status updates without context-switching to a separate interface. Devin also publishes an official MCP server that external AI agents connect into and consumes external MCP servers as a client.

Limitations

• ⚠Asynchronous operation creates a slow feedback loop: Devin tasks take minutes to hours rather than the near-instant responses developers expect from Cursor or Claude Code, making it unsuitable for tight iteration, debugging sessions, or pair programming workflows where real-time interaction matters.
• ⚠Performance degrades on ambiguous and open-ended requirements: Devin excels on bounded, well-specified tasks with clear success criteria, but the 25% failure rate rises significantly on open-ended feature development, unusual codebases, or tasks requiring architectural judgment that benefits from human context.
• ⚠Pay-as-you-go billing past quota creates cost unpredictability: Pro at $20/month includes a usage quota that can be exceeded on complex multi-step tasks, with additional usage billed at API pricing rates, making monthly spend difficult to predict for teams running multiple concurrent autonomous sessions.