AI coding agents - comparison - 2026
AI coding agents are tools that autonomously work with your codebase: read and edit files, run terminal commands, interact with Git, and execute complex tasks from natural language descriptions. Unlike simple autocomplete (Tab), agents can handle multi-step scenarios: "find the bug, fix it, run tests, commit."
Below is a comparison of the major AI coding agents as of July 2026.
Overview table
| Tool | Developer | License | Price | Interface | Free/local model support |
|---|---|---|---|---|---|
| OpenCode | anomalyco | MIT | Free (only API keys) | TUI + CLI | Yes (any provider) |
| Aider | Paul Gauthier (community) | Apache 2.0 | Free (only API keys) | CLI | Yes (Ollama, any API) |
| Cline | Saoud Rizwan / Cline Bot | Apache 2.0 | Free (only API keys) | VS Code / JetBrains / CLI | Yes (30+ providers, Ollama) |
| Goose | Block (Square) / Linux Foundation (AAIF) | Apache 2.0 | Free (only API keys) | CLI + Desktop | Yes (any provider, Ollama) |
| Claude Code | Anthropic | Proprietary | Included in Claude Pro ($20/mo) / Max | CLI + IDE plugins | No (Claude only) |
| Gemini CLI | Open source | Free (quotas in Gemini Code Assist) | CLI | Gemini only (via Google AI) | |
| Continue | Cursor (Anysphere) — acqui-hired | Apache 2.0 | Free (EOL, final release v2.0.0) | VS Code / JetBrains / CLI | Yes (any provider) |
| Windsurf | Codeium | Proprietary | Free tier + Pro ($15/mo) | IDE (VS Code fork) | No (Codeium models only) |
| Cursor | Anysphere | Proprietary | $20/mo (Pro) | IDE (VS Code fork) | No (built-in models only) |
Detailed feature comparison
Model support
| Tool | OpenAI | Anthropic (Claude) | Google (Gemini) | Ollama (local) | Any OpenAI-compatible | Others |
|---|---|---|---|---|---|---|
| OpenCode | Yes | Yes | Yes | Yes | Yes | AWS Bedrock, Azure, GCP Vertex |
| Aider | Yes | Yes | Yes | Yes | Yes | DeepSeek, Cohere |
| Cline | Yes | Yes | Yes | Yes | Yes | 30+ providers |
| Goose | Yes | Yes | Yes | Yes | Yes | MCP-compatible |
| Claude Code | No | Yes | No | No | No | Claude only |
| Gemini CLI | No | No | Yes | No | No | Gemini only |
| Continue (EOL) | Yes | Yes | Yes | Yes | Yes | Any |
| Windsurf | Yes | Yes | No | No | No | Codeium Cascade |
| Cursor | Yes | Yes | Yes | No | No | Custom models |
Capabilities
| Tool | Git integration | MCP | LSP | Multi-file editing | Terminal access | Browser (Puppeteer) | Plan/Act |
|---|---|---|---|---|---|---|---|
| OpenCode | Yes | Yes | Yes | Yes | Yes | No | Yes |
| Aider | Yes (auto-commits) | No | No | Yes | Yes (limited) | No | Yes |
| Cline | Yes | Yes (MCP Marketplace) | No | Yes | Yes | Yes | Yes |
| Goose | Yes | Yes (70+ MCP extensions) | No | Yes | Yes | Yes | Yes |
| Claude Code | Yes | Yes | No | Yes | Yes | Yes | Yes |
| Gemini CLI | Yes | Yes | No | Yes | Yes | No | Yes (ReAct) |
| Windsurf | Yes | No (limited) | Yes | Yes | No | No | Yes (Cascade) |
| Cursor | Yes | Yes | Yes | Yes (Composer) | No | No | Yes (Agent mode) |
Tool deep dives
OpenCode
Repository: anomalyco/opencode
OpenCode is an open-source (MIT) AI coding agent with a TUI interface. It runs in the terminal and supports any LLM provider via API keys. It includes built-in MCP (Model Context Protocol) and LSP (Language Server Protocol) support, giving it deep codebase understanding.
Key features:
- TUI (Terminal User Interface) with clean navigation
- Modes: run (one-shot tasks), serve (API server), web (web interface), attach (connect to backend)
- Provider support: OpenAI, Anthropic, Google, AWS Bedrock, Azure, GCP Vertex, Ollama, any OpenAI-compatible
- Custom agents via Open Agent Protocol
- Session history with --continue support
- Auto-share sessions
Installation:
curl -fsSL https://opencode.ai/install.sh | sh
Usage:
opencode # TUI mode opencode run "task" # One-shot task opencode --continue # Resume session
Aider
Website: aider.chat | Repository: github.com/paul-gauthier/aider
Aider is one of the most mature open-source AI coding agents (Apache 2.0). It focuses on pair programming through the terminal with deep Git integration and a unique repo-map algorithm for codebase understanding.
Key features:
- Automatic Git commits after every change
- Repo-map — context map of the entire codebase for the LLM
- Architecture-level refactoring support
- Built-in linting and test execution
- Modes: pair programming, architect, ask
Installation:
python -m pip install aider-chat
Usage:
aider # Interactive mode aider --architect # Architect mode aider --model ollama/deepseek-coder # Local model
Limitations: No MCP support, no GUI/TUI, CLI-only.
Cline
Repository: github.com/cline/cline
Cline (formerly Claude Dev) is an open-source AI coding agent (Apache 2.0) with the broadest platform support: VS Code, JetBrains, Cursor, Windsurf, Zed, Neovim, and a preview CLI for macOS/Linux. 5M+ installs, 60k+ GitHub stars.
Key features:
- VS Code/JetBrains extension
- 30+ LLM providers
- Built-in MCP Marketplace
- Plan/Act split for planning and execution
- Checkpoints — rollback to previous states
- Puppeteer browser control
- Rules — custom behavior policies
Installation:
# VS Code: install from marketplace # or via CLI: npm install -g @cline/cli
Goose
Website: block.github.io/goose | Repository: github.com/block/goose
Goose is an open-source AI coding agent (Apache 2.0), originally built by Block (Square) and now under Linux Foundation (AAIF) stewardship. Designed as a maximally extensible autonomous agent.
Key features:
- 70+ built-in MCP extensions
- Fully autonomous: planning, editing, command execution, testing, iteration
- Runs entirely on your machine
- Interfaces: CLI and Desktop app
- Model Context Protocol (MCP) core architecture
- Works with any LLM (OpenAI, Anthropic, Ollama, etc.)
- Extensible via custom MCP servers
Installation:
brew install goose # or pip install goose-ai
Usage:
goose run "task description" goose session --model ollama/llama3
Claude Code
Website: claude.com
Anthropic's first-party AI coding agent. Bundled with Claude Pro and Max, available as CLI and IDE plugins (VS Code, JetBrains). Widely regarded as the most accurate agent (96% accuracy on 2026 benchmarks).
Key features:
- Deep Claude integration — best-in-class accuracy
- MCP-native
- Modes: agent, edit, ask
- Fastest task execution
- IDE plugins with agent mode
- Limited by Claude free quotas
Usage:
# Included with Claude Pro/Max claude
Limitations: Tied to the Anthropic ecosystem, no local or third-party model support.
Gemini CLI
Website: Google Developers
An open-source AI agent from Google with free access through Gemini Code Assist. Uses a ReAct (Reason and Act) loop for multi-step tasks.
Key features:
- Free (quotas via Gemini Code Assist)
- Open source
- MCP support
- ReAct loop for multi-step tasks
- Available in Cloud Shell without installation
- Works for non-coding tasks too
Installation:
gem install gemini-cli
Continue (EOL)
Website: continue.dev
Was a popular open-source AI coding assistant (VS Code, JetBrains, CLI). In June 2026 the team was acqui-hired by Cursor (Anysphere). The repository is now read-only, final release is v2.0.0.
Legacy: model-agnostic architecture, any provider support, chat, autocomplete, context providers.
Windsurf
Website: codeium.com/windsurf
An IDE (VS Code fork) from Codeium with a built-in AI agent called Cascade. Has a free tier.
Key features:
- Cascade — flow-aware agent with action context tracking
- Supercomplete — intelligent completions
- Free tier available
- Limited to Codeium's models
Cursor
Website: cursor.com
The most popular AI-first IDE (VS Code fork). Uses custom models alongside Claude/GPT.
Key features:
- Composer — multi-file editing
- Agent mode — autonomous agent
- Cursor Tab — autocomplete
- Chat with full codebase context
- $20/mo (Pro)
- Best IDE integration among all tools
Architectural comparison
| Aspect | CLI agents (OpenCode, Aider, Goose, Claude Code) | IDE extensions (Cline, Continue) | AI-first IDE (Cursor, Windsurf) |
|---|---|---|---|
| Installation | via pip/brew/npm | VS Code/JetBrains Marketplace | Download IDE |
| Launch | Terminal | Side panel | Full editor |
| Portability | High (any terminal) | Medium (requires IDE) | Low (own IDE only) |
| Autocomplete (Tab) | No | Yes (some) | Yes |
| Context depth | Entire codebase | Current file + project | Entire codebase |
| Multi-agent | Limited | Limited | No |
| Vendor lock-in | Low (any model) | Low (open-source ones) | High |
| Cost | API only | API only | $15-20/mo + API |
When to choose what
- OpenCode — if you want TUI, MCP + LSP, maximum provider flexibility, MIT license
- Aider — if you need deep Git integration, auto-commits, working with large repos
- Cline — if you work in VS Code and want a permission-gated agent with MCP and browser
- Goose — if you need the most extensible agent with 70+ MCP extensions under Linux Foundation
- Claude Code — if you already pay for Claude and want best accuracy (96%)
- Gemini CLI — if you want a free agent without an API key (Google quotas)
- Cursor — if you want an all-in-one AI-first IDE with the best UX
- Windsurf — if you want a free tier with agentic mode
Pricing reality
Important nuance: free open-source tools mean the tool itself costs nothing, but you pay for LLM API calls. Real costs:
- Light tasks: $0.10-0.50/day (GPT-4o mini, Claude Haiku, Gemini Flash)
- Heavy tasks (refactoring large codebase): $2-10/day (GPT-4o, Claude Sonnet/Opus)
- Local models via Ollama (Llama 3, DeepSeek Coder): $0 (electricity only)
Paid tools (Cursor, Windsurf Pro) include some API costs in the subscription.
2026 trends
1. MCP (Model Context Protocol) became the standard — all new agents support MCP 2. Market consolidation — acqui-hire of Continue (by Cursor), IDE-agent convergence 3. Hybrid architectures — agents increasingly work both in IDE and CLI (Cline, Claude Code) 4. Local models caught up with cloud quality for most coding tasks 5. Free agents from Google (Gemini CLI) and OpenAI (free ChatGPT quotas) put pressure on pricing
Links
- OpenCode: github.com/anomalyco/opencode | opencode.ai
- Aider: github.com/paul-gauthier/aider | aider.chat
- Cline: github.com/cline/cline
- Goose: github.com/block/goose | block.github.io/goose
- Claude Code: claude.com
- Gemini CLI: Google Developers
- Continue: continue.dev (EOL, acquired by Cursor)
- Windsurf: codeium.com/windsurf
- Cursor: cursor.com
- MCP: modelcontextprotocol.io
- Ollama: ollama.com
