Complete Guide to AI CLI Tools: Gemini CLI vs Claude Code vs Codex
Compare the top command-line AI assistants. Features, pricing, use cases, and which tool fits your workflow.
Overview: The AI CLI Landscape
Command-line AI tools have revolutionized how developers interact with AI models. Unlike web interfaces, CLI tools offer faster workflows, scriptable automation, and seamless integration into existing development environments.
Popular options include Gemini CLI (Google), Claude Code (Anthropic), Codex, Qwen Code, Goose CLI, and Auggie. Each has unique strengths, but they share common limitations: single-session constraints, no conversation history, and terminal-only interfaces.
AionUi solves these problems by providing a unified graphical interface that works with all these CLI tools, adding multi-session support, local storage, and visual previews.
Detailed Comparison Table
| Feature | Gemini CLI | Claude Code | Codex | AionUi (Unified) |
|---|---|---|---|---|
| Interface | Terminal | Terminal | Terminal | GUI + Terminal |
| Multi-session | No | No | No | Yes |
| Conversation History | No | No | No | Yes (Local SQLite) |
| File Preview | No | No | No | 9+ formats |
| Remote Access | No | No | No | WebUI + Telegram |
| Multi-agent Support | No | No | No | Yes |
| Cost | Free (API costs) | Free (API costs) | Free (API costs) | Free & Open Source |
Gemini CLI
Gemini CLI is Google's command-line interface for Gemini models. It's built into AionUi by default, requiring no additional installation.
Strengths:
- Free to use (API costs apply)
- Fast response times
- Good code generation capabilities
- Built-in image generation support
Use Cases:
- Code generation and debugging
- Documentation writing
- Image generation tasks
- General Q&A
Claude Code (Claw)
Claude Code, also known as Claw, is Anthropic's CLI tool for Claude models. It excels at code analysis and complex reasoning tasks.
Strengths:
- Excellent code understanding
- Strong reasoning capabilities
- Long context windows
- Good at refactoring
Use Cases:
- Code review and analysis
- Architecture planning
- Complex problem solving
- Technical writing
Codex
Codex is another popular CLI AI tool focused on code generation and completion.
Strengths:
- Fast code generation
- Multiple language support
- Good for boilerplate code
Why Use AionUi with CLI Tools?
While individual CLI tools are powerful, AionUi adds essential features:
- Unified Interface – Use all CLI tools from one GUI
- Multi-Session Support – Run multiple conversations simultaneously
- Local Storage – All conversations saved in SQLite
- File Management – Preview, organize, and manage generated files
- Remote Access – Access via WebUI or Telegram
- Scheduled Tasks – Automate recurring AI operations
See multi-agent setup guide to configure multiple CLI tools in AionUi.