Continue.dev vs Cline vs Codex CLI: AI Coding Agents for VS Code in 2026

AI coding agents for VS Code have exploded in 2026. Beyond the well-known code editors like Cursor and Windsurf, there's a thriving ecosystem of extensions that bring AI agents directly into your existing VS Code setup.

The three biggest players are Continue.dev, Cline, and OpenAI Codex CLI. Each takes a different approach — and which one is right for you depends entirely on how you want to work.

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At a Glance

| Feature | Continue.dev | Cline | Codex CLI | |---------|-------------|-------|-----------| | Model support | Any (BYO key) | Any (BYO key) | Only OpenAI models | | Agent mode | ❌ (Chat + Edit) | ✅ (Full agent) | ✅ (Terminal agent) | | File editing | Apply suggestions | Auto-edit files | Terminal-based | | Terminal access | ❌ | ✅ (Agent mode) | ✅ | | Browser access | ❌ | ✅ (Agent mode) | ❌ | | Custom instructions | .continuerules | .clinerules | N/A | | Pricing | Free + API costs | Free + API costs | Free + API costs | | Open source | ✅ (Apache 2.0) | ✅ (Apache 2.0) | ✅ (MIT) | | Rating | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ |

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1. Continue.dev — The Swiss Army Knife

Best for: Developers who want a flexible AI assistant without full autonomy

Continue is the most mature and feature-rich AI coding extension for VS Code. It supports every major model — you bring your own API key and choose between Claude, GPT, DeepSeek, Gemini, or local models via Ollama/LM Studio.

Key Features

Chat (Ctrl+L) — Standard AI chat with code context. Ask questions about your codebase, get explanations, request refactoring suggestions.

Edit (Ctrl+I) — Select code, describe changes, get a diff preview. Hit "Apply" to make the change.

Inline Completions — Tab-complete suggestions as you type (similar to Copilot but model-agnostic).

Hub — Community-contributed "skills" (prompts) for common tasks like "write unit tests", "explain this file", "add JSDoc".

What We Liked

- Model flexibility — Switch between Claude (for complex work), DeepSeek (for cheap quick tasks), and Ollama (for offline use) - Diff preview — See exactly what will change before applying - Custom commands — Create your own slash commands for repeated tasks - Lightweight — Minimal performance impact on VS Code - Excellent documentation — Active community, regular updates

What We Didn't

- No agent mode — Can't autonomously explore your codebase, run commands, or iterate - Context limits — Sometimes misses cross-file dependencies in large projects - Completions are basic — Not as good as Cursor's tab completions

Best Uses

- Day-to-day AI assistance for experienced developers - Teams that want to bring their own model / API keys - Projects with strict compliance (air-gapped models) - Documentation-heavy workflows

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2. Cline — The Autonomous Agent

Best for: Developers who want Claude Code-level autonomy inside VS Code

Cline (formerly Claude Dev) is the closest you can get to Claude Code as a VS Code extension. It's a full autonomous agent — it can read files, write code, run terminal commands, create new files, and even control a headless browser.

Key Features

Agent Mode — Cline operates like a senior developer given a task. You describe what you want, and it plans, executes, and reports back:

"Add a search bar to the header component"
→ Cline reads the header component
→ Checks the project structure
→ Creates a new SearchBar component
→ Updates the header to include it
→ Runs the linter
→ Reports changes made

Terminal Access — Cline can: - Run npm install when new dependencies are needed - Execute tests to verify changes - Debug build errors by reading error output - Restart dev servers

Browser Control — Cline can open a headless browser to: - Verify the UI looks correct after changes - Test form submissions - Check responsive design

Cost Controls — Cline tracks token usage and lets you set spending limits. It also shows you model costs before each action.

What We Liked

- True autonomy — Describe a task, get it done (like Claude Code) - Terminal integration — Debugs issues by actually running commands - Cost transparency — Shows estimated cost before each action - Custom instructions — .clinerules file for project-specific guidance - Checkpoints — Can roll back changes if something goes wrong

What We Didn't

- Can be aggressive — Makes changes without enough confirmation by default - Slower than Continue — Full agent mode takes time to plan - API costs add up — Active agent use can cost $5-15 per day with Claude 4 - Not for beginners — Requires understanding of git and code review

Best Uses

- Large refactors that span multiple files - Automating repetitive coding tasks - Debugging complex issues with terminal integration - Building features from scratch (with supervision) - Developer teams that already use Claude Code in CLI

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3. Codex CLI — OpenAI's Terminal Agent

Best for: Developers who only use OpenAI models and want a lightweight terminal-based agent

Codex CLI is OpenAI's answer to Claude Code — a terminal-based agent that runs entirely in your terminal, not in VS Code. The VS Code extension is secondary to the CLI experience.

Key Features

Terminal-First — Codex CLI runs in the terminal, reads your codebase, and makes changes:

codex "Add an error boundary to the app router"

Sandboxed Execution — Codex runs commands in a sandbox to prevent accidental damage. You approve each action.

Session Memory — Codex remembers context across a session, so you can build on previous conversations.

What We Liked

- Sandboxing — Safer than fully autonomous agents - Terminal-native — Feels natural for CLI-focused developers - Free tier — 50 requests per day on the free plan - Fast — Optimized for OpenAI's infrastructure

What We Didn't

- OpenAI-only — Can't use Claude, DeepSeek, or local models - No VS Code integration — The extension is minimal; you're mostly in the terminal - Limited context — Smaller context window than competitors - No custom instructions — Can't configure behavior per-project - Less mature — Fewer features than Cline or Continue

Best Uses

- Quick terminal-based code generation - Developers already on the OpenAI ecosystem - Lightweight automation tasks - Learning/experimentation

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Detailed Comparison

Model Support

| Extension | Models Supported | Cost to Run | |-----------|-----------------|-------------| | Continue | Any (OpenAI, Anthropic, Google, DeepSeek, Ollama, LM Studio, Groq, etc.) | Your API keys | | Cline | Any (same as Continue, plus local models) | Your API keys | | Codex CLI | OpenAI only (GPT-5, GPT-4o, o3) | OpenAI API (free tier available) |

File Editing

| Feature | Continue | Cline | Codex CLI | |---------|----------|-------|-----------| | Inline edits | ✅ (diff preview) | ✅ (auto-apply) | ❌ (terminal only) | | Multi-file edits | Manual | ✅ Automatic | ✅ Automatic | | Create new files | Manual | ✅ | ✅ | | Delete files | ❌ | ✅ | ✅ | | Rollback | Git-based | ✅ Built-in checkpoints | Git-based |

Terminal Integration

| Feature | Continue | Cline | Codex CLI | |---------|----------|-------|-----------| | Run commands | ❌ | ✅ | ✅ | | Read output | ❌ | ✅ | ✅ | | Install packages | ❌ | ✅ | ✅ | | Debug builds | ❌ | ✅ | ✅ | | Git operations | ❌ | ✅ ✅ | ✅ |

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Pricing Comparison

All three are free to install — you pay only for API usage:

| Usage Level | Continue | Cline | Codex CLI | |-------------|----------|-------|-----------| | Light (<100K tokens/day) | $3-10/mo | $5-15/mo | Free (50 req/day) | | Medium (1M tokens/day) | $30-100/mo | $50-150/mo | $20-50/mo | | Heavy (10M tokens/day) | $300-1000/mo | $500-1500/mo | $200-500/mo |

Costs vary based on model choice. DeepSeek V3 is 97% cheaper than Claude 4.

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Recommendation

Start with Continue.dev if: - You want an AI assistant that works alongside you, not instead of you - You need the broadest model support - You want AI suggestions without giving up control - You're new to AI coding agents

Use Cline if: - You want Claude Code-level autonomy inside VS Code - You're comfortable reviewing AI-generated changes - You do complex multi-file work regularly - You already use Claude Code or similar agents

Try Codex CLI if: - You're an OpenAI user through and through - You prefer terminal-based workflows - You want a free tier to experiment with

Pro setup: Continue.dev for daily assistance + Cline for heavy lifting. Use Continue when you're actively coding and want suggestions. Switch to Cline when you need to "go make this feature work" and come back to review the results.

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How to Set Up Each

Continue.dev

# Install from VS Code marketplace
ext install continue.continue
# Configure in ~/.continue/config.json
{
  "models": [
    {
      "title": "Code (Best)",
      "provider": "anthropic",
      "model": "claude-4-sonnet"
    },
    {
      "title": "Code (Cheap)",
      "provider": "openai",
      "model": "deepseek-chat",
      "apiKey": "your-deepseek-key"
    }
  ]
}

Cline

# Install from VS Code marketplace
ext install saoudrizwan.claude-dev
# Configure API key in settings
# Add .clinerules to your project root
# Cost controls (recommended):
# Max requests per task: 25
# Max spins per request: 5
# Daily budget: $5

Codex CLI

# Install globally
npm install -g @openai/codex
# Run in any project
cd your-project
codex --model gpt-5

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Related guides: - DeepSeek vs Claude vs GPT in 2026 - Ollama vs LM Studio in 2026 - How to Write Effective Prompts for Claude Code - Multi-Agent Coding Workflow Setup