Quick Verdict
Decision Matrix (March 2026)
- Choose Codex CLI if: You prefer terminal workflows, want multi-agent parallel execution, or use OpenAI models and want the tightest integration with their API.
- Choose Cline if: You work in VS Code, want the largest MCP ecosystem, browser automation, or prefer visual diff review for code changes.
- Either works if: You need a free, open-source AI coding agent. Both are Apache 2.0, both support BYOK model access, both are actively developed.
Two of the most popular open-source coding agents, built for different environments. Codex CLI is OpenAI's official terminal agent with Rust performance and multi-agent support. Cline is the community-driven VS Code agent that pioneered MCP and Plan/Act workflows.
If your workflow centers on the terminal, Codex CLI fits naturally. If your workflow centers on VS Code, Cline is the more integrated choice. The feature sets are converging (Cline added CLI 2.0, Codex CLI added MCP), but the core experiences remain distinct.
Feature Comparison
| Feature | Codex CLI | Cline |
|---|---|---|
| License | Apache 2.0 | Apache 2.0 |
| GitHub Stars | 62K+ | 58K+ |
| Installs/Downloads | npm package | 5M+ VS Code installs |
| Built With | Rust | TypeScript |
| Interface | Terminal | VS Code sidebar |
| Multi-Agent | Yes (isolated worktrees) | No |
| MCP Support | Yes (shell-tool-mcp) | Yes (built-in marketplace) |
| Browser Automation | No | Yes (Computer Use) |
| Plan/Act Workflow | No (single mode) | Yes (toggle) |
| CLI Tool | Native (is a CLI) | CLI 2.0 (addon) |
| File Editing | Patch-based | Full file rewrite |
| Auto-Approve | Yes (configurable) | Yes (YOLO mode) |
| Web Search | Built-in (OpenAI index) | Via MCP tools |
| Model Providers | OpenAI API | Any (OpenAI, Anthropic, Google, local) |
| Sandbox | Local sandboxing | Human approval per action |
Pricing and Token Costs
Both tools are free. The cost is in API tokens, and here the model flexibility matters.
Codex CLI: OpenAI API
Codex CLI works with OpenAI's models. The default codex-mini model is optimized for coding tasks at low cost. You can also use GPT-5.4 or o3 for complex reasoning tasks. Pricing follows OpenAI's standard API rates.
Cline: Any Provider
Cline supports every major provider: OpenAI, Anthropic (Claude), Google (Gemini), DeepSeek, and local models via Ollama or LM Studio. This flexibility lets you optimize for cost. DeepSeek V3 or local models bring costs to near zero. Claude Sonnet 4 gives the highest quality at a premium.
Monthly API Cost Estimates (Active Developer)
- Codex CLI + codex-mini: $5-15/month (cost-optimized model)
- Codex CLI + GPT-5.4: $20-50/month
- Cline + DeepSeek V3: $2-8/month
- Cline + Claude Sonnet 4: $30-80/month
- Cline + local model: $0 (hardware costs only)
Cline's model flexibility gives it the wider cost range. Codex CLI is locked to OpenAI's pricing but the default model is efficient.
Cline rewrites entire files for edits, which consumes more output tokens on large files. Codex CLI uses patch-based editing that only outputs changed sections. On large files (500+ lines), Codex CLI uses fewer output tokens per edit.
Agent Architecture
Codex CLI: Multi-Agent Terminal
Codex CLI's standout feature is multi-agent execution. You can spin up multiple agents on the same repository, each working in an isolated git worktree on its own branch. Agent A refactors the auth module while Agent B writes API tests. No conflicts, no merge issues during execution.
The Rust implementation (codex-rs) provides fast startup and low memory usage. Local sandboxing restricts file system and network access based on your configuration. The agent can read files, write changes, and run commands within the sandbox.
Cline: VS Code Agent with Plan/Act
Cline's Plan/Act workflow separates thinking from doing. In Plan mode, the agent analyzes your request, explores the codebase, and proposes an approach without modifying anything. In Act mode, it executes with human approval at each step.
The MCP Marketplace lets you extend Cline with community tools. Ask Cline to "add a database tool" and it creates, configures, and installs an MCP server automatically. Browser automation via Computer Use lets the agent interact with web pages for debugging and testing.
Codex CLI: Parallel Agents
Multiple agents on isolated worktrees. Rust performance. Local sandboxing. Web search. Patch-based edits. Designed for throughput on large tasks.
Cline: Plan/Act + MCP
Plan mode for analysis, Act mode for execution. MCP Marketplace for tool extensions. Browser automation. Visual diff review. 5M+ installs of community knowledge.
MCP and Extensibility
Both tools support MCP (Model Context Protocol), but with different levels of maturity.
Cline: MCP Pioneer
Cline was one of the first tools to integrate MCP. Its built-in Marketplace offers one-click installs for community-built MCP servers covering databases, deployment, monitoring, and more. You can ask Cline to create custom MCP servers from scratch. The ecosystem is the most mature in the VS Code agent space.
Codex CLI: MCP via shell-tool-mcp
Codex CLI's MCP support is newer but functional. The shell-tool-mcp module enables tool integration, and the OpenAI Agents SDK connection allows orchestrating multiple agents. The ecosystem is smaller than Cline's, but growing with OpenAI's backing.
| MCP Aspect | Codex CLI | Cline |
|---|---|---|
| MCP Support | Yes (shell-tool-mcp) | Yes (built-in) |
| Marketplace | No | Yes (one-click installs) |
| Auto-Create Servers | No | Yes (ask Cline to build one) |
| Community Tools | Growing | Largest in VS Code agent space |
| Agent SDK | OpenAI Agents SDK | N/A |
When Codex CLI Wins
Terminal-Native Workflow
If you work in tmux splits with Vim/Neovim, Codex CLI drops into your workflow without context switching. Cline requires VS Code.
Multi-Agent Parallel Work
Split large tasks across multiple agents. Each gets an isolated worktree. Cline runs one agent at a time. For large refactors or test generation, parallel execution saves hours.
OpenAI Integration
Tightest integration with OpenAI's models. codex-mini is optimized for the CLI. Web search uses OpenAI's index. If your team is already on OpenAI, Codex CLI is the natural fit.
Lower Token Usage on Large Files
Patch-based editing outputs only changed sections. Cline rewrites full files. On 500+ line files, Codex CLI uses significantly fewer output tokens per edit.
When Cline Wins
VS Code Integration
Full VS Code sidebar experience. Visual diffs, inline suggestions, file explorer integration. If you edit code in VS Code, Cline is right there.
Model Flexibility
Any provider: OpenAI, Anthropic, Google, DeepSeek, local models. Codex CLI is OpenAI only. For cost optimization or provider preference, Cline gives more options.
MCP Marketplace
The largest MCP tool ecosystem. One-click installs. Auto-create custom servers. Community-built tools for databases, CI/CD, monitoring. Codex CLI's MCP ecosystem is newer.
Browser Automation
Computer Use support for web interaction. Cline launches browsers, clicks elements, captures screenshots. Useful for frontend testing and debugging. No equivalent in Codex CLI.
Decision Framework
| Priority | Best Choice | Why |
|---|---|---|
| Terminal workflow | Codex CLI | Native terminal agent, Rust performance |
| VS Code workflow | Cline | Full sidebar integration, visual diffs |
| Multi-agent parallelism | Codex CLI | Isolated worktree agents, concurrent execution |
| MCP ecosystem | Cline | Largest marketplace, one-click installs, auto-create |
| Model flexibility | Cline | Any provider including local models |
| OpenAI integration | Codex CLI | Native OpenAI SDK, codex-mini model |
| Browser automation | Cline | Computer Use for web interaction |
| Token efficiency (large files) | Codex CLI | Patch-based editing vs full file rewrite |
| Community size | Cline | 5M+ installs, more tutorials and resources |
Both are excellent tools. The decision is about where you work. Terminal developers choose Codex CLI. VS Code developers choose Cline. Some developers use both, delegating tasks based on the workflow that fits best.
For the code transformations underlying both agents, WarpGrep provides fast semantic codebase search that works as an MCP tool with either Codex CLI or Cline.
Frequently Asked Questions
Is Codex CLI or Cline more popular?
Codex CLI has more GitHub stars (62K+ vs 58K+). Cline has far more installs (5M+ VS Code). Stars reflect developer interest; installs reflect daily usage. Cline has the larger active user base.
Can I use Codex CLI and Cline together?
Yes. Codex CLI runs in your terminal. Cline runs in VS Code. They don't conflict. Use Codex CLI for terminal-heavy tasks and Cline for code editing where VS Code's UI helps visualize changes.
Which is cheaper?
Both tools are free. Cline with DeepSeek or local models is the cheapest option ($0-8/month). Codex CLI with codex-mini is also affordable ($5-15/month). Cline's model flexibility gives it the wider cost range.
Does Cline have a CLI now?
Yes. CLI 2.0 launched with Plan/Act toggle via Tab key and auto-approve via Shift+Tab. It brings Cline's VS Code features to the terminal, but still requires the Cline extension infrastructure.
What is Codex CLI's multi-agent feature?
Multiple agents work on the same repository simultaneously using isolated git worktrees. Each agent gets its own branch and working directory. One agent refactors module A while another writes tests for module B. Cline has no equivalent.
Related Comparisons
Semantic Code Search for Open-Source Agents
WarpGrep provides fast semantic codebase search. Works as an MCP tool with Codex CLI, Cline, or any AI coding agent.