Codeium (Devin Desktop) vs Mentat

Detailed side-by-side comparison to help you choose the right tool

Codeium (Devin Desktop)

🟡Low Code

AI Development Platforms

Codeium has rebranded to Devin Desktop under Cognition — an IDE plus coding-agent command center with Free, Pro $20, Max $200, and Team plans.

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Starting Price

$0
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Mentat

🔴Developer

AI Development Assistants

Open-source command-line AI coding assistant that coordinates multi-file edits with project-wide codebase understanding, enabling complex refactoring and feature implementation across entire projects through natural language commands.

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Starting Price

Free
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Feature Comparison

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FeatureCodeium (Devin Desktop)Mentat
CategoryAI Development PlatformsAI Development Assistants
Pricing Plans5 listed plans2 listed plans
Starting Price$0Free
Key Features
  • • Unlimited Free Autocomplete: Codeium's free tier offers unlimited AI-powered autocomplete suggestions with no daily caps or throttling. The system uses proprietary models trained for code to deliver context-aware completions that understand imports, variable names, and project structure. Multi-line suggestions handle entire function bodies, complex conditionals, and repetitive patterns. Latency stays under 300ms through speculative execution and local caching.
  • • 40+ IDE and Editor Integration: The broadest IDE support of any AI coding assistant — VS Code, JetBrains suite (IntelliJ, PyCharm, WebStorm, GoLand), Neovim, Vim, Emacs, Eclipse, Sublime Text, Jupyter Notebooks, Google Colab, and more. Developers adopt AI assistance without switching editors, and teams with mixed tooling preferences can standardize on one AI provider.
  • • In-Editor AI Chat: A conversational AI interface embedded directly in the editor for code explanation, refactoring, test generation, debugging, and cross-language translation. The chat is aware of your current file and project context, producing more targeted responses than general-purpose AI chatbots. Supports multi-turn conversations for iterative problem-solving.
  • • Multi-file coordination and editing
  • • Natural language to code translation
  • • Codebase-aware refactoring

💡 Our Take

Choose Mentat if you need command-line multi-file editing and are comfortable paying OpenAI API costs for GPT-4-level capabilities. Choose Codeium if you want a free IDE-integrated autocompletion tool with no API costs and support for 70+ languages — Codeium's free tier is more accessible for individual developers who primarily need single-file code suggestions, while Mentat targets project-wide refactoring workflows.

Codeium (Devin Desktop) - Pros & Cons

Pros

  • ✓Bundles a real IDE, frontier model access, and Devin Cloud agents at $20/month — competitive with Cursor
  • ✓SWE 1.6 (Cognition's own coding model) is free on Pro+ and is improving fast as a first-party model
  • ✓Agent Client Protocol and parallel session management are genuinely useful for multi-agent workflows

Cons

  • ✗Rebrand from Codeium / Windsurf to Devin Desktop has created naming confusion across docs and tutorials
  • ✗Free plan is now meaningfully more limited than the original Codeium free-forever autocomplete
  • ✗$200/mo Max plan matches Cursor Ultra without a clear quality advantage on frontier model output

Mentat - Pros & Cons

Pros

  • ✓Free and open-source (MIT license) with an active community on GitHub
  • ✓Coordinates complex multi-file changes automatically across entire projects
  • ✓Pay-per-use model via OpenAI API avoids fixed monthly subscription costs
  • ✓Command-line interface integrates seamlessly with existing terminal workflows and CI/CD pipelines
  • ✓Supports large context windows for broad codebase analysis
  • ✓No vendor lock-in - full code transparency allows security auditing and customization

Cons

  • ✗Requires OpenAI API access and associated costs
  • ✗Limited by LLM token context windows for large files
  • ✗May generate code that requires careful review
  • ✗Command-line interface may have learning curve for GUI-focused developers
  • ✗Dependent on external API availability and performance
  • ✗May not understand highly domain-specific or proprietary patterns
  • ✗Requires careful prompt engineering for complex tasks
  • ✗No built-in code execution or testing capabilities

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Review Codeium (Devin Desktop)Review Mentat