CruxCLI vs Codex CLI
CruxCLI and Codex CLI are both open-source terminal AI coding agents, built on different technology stacks with different strengths. CruxCLI is TypeScript/Bun-based with LSP integration for 30+ language servers, a plugin API, client/server architecture, and 24 task-specific modes with model tier mapping. Codex CLI is OpenAI's Rust-based agent with multi-agent workflows, screenshot/image input, and lower memory usage, but is locked to OpenAI models with no LSP integration or plugin support.
Feature comparison
| Feature | CruxCLI | Codex CLI |
|---|---|---|
| Open source | MIT | Apache-2.0 |
| Provider-agnostic | 75+ providers | OpenAI only |
| Mode → model tier mapping | 24 modes | ✗ |
| Token budget system | ✓ | ✗ |
| Convergence engine | ✓ | ✗ |
| Workspace checkpoints | ✓ | ✗ |
| Client/server architecture | ✓ | ✗ |
| LSP integration | 30+ servers | ✗ |
| Plugin API | ✓ | ✗ |
| VS Code extension | ✓ | ✗ |
| Rust-based | ✗ | ✓ |
| Multi-agent workflows | ✗ | ✓ |
| Screenshot/image input | ✗ | ✓ |
| GitHub stars | New | 67k |
Where CruxCLI wins
LSP integration
CruxCLI's built-in LSP client connects to 30+ language servers, providing real diagnostics, symbol lookup, and go-to-definition. Codex CLI has no LSP support — it relies on string matching and regex for code understanding.
Plugin API and MCP
CruxCLI has a plugin API for custom tools and full MCP client support (stdio, SSE, StreamableHTTP). Codex CLI has neither — its extensibility is limited to what OpenAI builds in.
Client/server architecture
CruxCLI's HTTP server on port 4096 enables multiple frontends: TUI, web, desktop, VS Code. Codex CLI is a monolithic process with no remote-drivable sessions.
Provider flexibility
CruxCLI supports 75+ providers. Codex CLI is locked to OpenAI models (o3, o4-mini). If you want to use Claude, Gemini, or local models, you need a different tool.
Where Codex CLI wins
Rust performance
Codex CLI is written in Rust with lower memory usage and faster startup than CruxCLI's Bun-compiled binary. For most coding tasks the LLM response time dominates, but the CLI overhead matters for quick operations.
Multi-agent workflows
Codex CLI supports multi-agent workflows where multiple agents work on different parts of a codebase simultaneously. CruxCLI has subagent support but not multi-agent orchestration at this level.
Screenshot and image input
Codex CLI can accept screenshots and images as input, useful for UI-related tasks. CruxCLI does not currently support image input. This is a gap we plan to close.
OpenAI backing
67,280 stars and OpenAI's resources behind development. Codex CLI will get early access to new OpenAI models and features.
Frequently asked questions
What is the difference between CruxCLI and Codex CLI?
CruxCLI is a TypeScript/Bun-based terminal agent with LSP integration, plugin API, client/server architecture, and 24 task-specific modes. Codex CLI is OpenAI's Rust-based agent with multi-agent workflows and screenshot input, but locked to OpenAI models with no LSP or plugin support.
Can CruxCLI use OpenAI models?
Yes. CruxCLI supports OpenAI as a provider. Set your OPENAI_API_KEY and use GPT-5, o3, o4-mini, or any OpenAI model. CruxCLI can also use 75+ other providers simultaneously.
Is Codex CLI faster than CruxCLI?
Codex CLI is written in Rust and has lower memory usage and faster startup. CruxCLI is compiled with Bun, which is fast but not Rust-fast. For most coding tasks, the LLM response time dominates — the CLI overhead is negligible.
Try CruxCLI
Use OpenAI, Claude, Gemini, or any model. LSP-powered code intelligence.