AI Coding Tools Compared: The Definitive Guide After Antigravity 2.0
Google Antigravity 2.0 launched at I/O on May 19, 2026 — a full agent-first IDE with multi-agent orchestration, voice commands, and browser verification. Cursor shipped v3 with 8-agent parallelism. GitHub Copilot moved to usage-based billing. Every tool now has background agents. This is the vendor-neutral comparison of every major AI coding tool as the landscape stands in May 2026 — features, pricing, models, orchestration, and the decision framework for choosing what fits your workflow.
The May 2026 Landscape
Twelve months ago, "AI coding tool" meant autocomplete. Today it means autonomous agents that clone repos, write code, run tests, verify in a browser, and open pull requests — all while you sleep. Three shifts define the current moment:
The IDE is now a control plane, not an editor
Google Antigravity 2.0 shipped an Agent Teams panel where you compose squads of sub-agents with explicit roles, each sandboxed, running in parallel. Cursor v3 runs up to 8 agents simultaneously with multi-repo execution. JetBrains Junie launched alongside the Air platform for multi-agent delegation. The IDE is no longer where you type code — it is where you supervise agents that type code.
Seven of nine major tools now run agents asynchronously
GitHub Copilot’s Coding Agent creates PRs autonomously in cloud dev environments. OpenAI Codex runs cloud-based async tasks. Google Jules spins up a VM, clones your repo, works autonomously, and returns a PR. Kiro maintains persistent context across sessions. The only major holdout is Aider, which remains interactive by design.
$20/mo is the new baseline — but power users pay 10x
Every tool offers a ~$20/month plan. But heavy agent usage blows past those limits fast. Claude Code Max goes to $200/month. Cursor Ultra costs $200/month. Antigravity AI Ultra tops out at $200/month. GitHub Copilot is moving to usage-based billing starting June 2026. The era of flat-rate AI coding is ending.
Quick Comparison Table
| Tool | Type | Starting price | Primary model | Background agents | Multi-agent | Open source |
|---|---|---|---|---|---|---|
| Antigravity 2.0 | IDE + CLI | Free / $20/mo | Gemini 3.5 Flash | Yes | Yes | CLI only |
| Claude Code | CLI | $20/mo | Claude Opus 4.6 | Yes | Yes | Yes |
| Cursor v3 | IDE | Free / $20/mo | Multi-model | Yes | Yes (8x) | No |
| GitHub Copilot | IDE extension | Free / $10/mo | Multi-model | Yes | Yes | No |
| OpenAI Codex | CLI + Cloud | $20/mo (Plus) | GPT-4o / o3 | Yes | No | Yes |
| Windsurf | IDE | Free / $15/mo | SWE-1.5 | Yes | Emerging | No |
| Kiro | IDE | $20/mo | Claude (Bedrock) | Yes | Yes | No |
| Aider | CLI | Free (OSS) | Any model | No | No | Yes |
| JetBrains Junie | IDE plugin | $10/mo (+ IDE) | Multi-model | Yes | Yes | No |
Deep Dives: Every Tool
Google Antigravity 2.0
Google’s agent-first IDE, launched at Google I/O 2026 on May 19. Built as a VS Code fork with AI agents woven into every surface. The Agent Teams panel lets you compose squads of sub-agents with explicit roles — each runs in its own sandbox, working in parallel. Built-in Chromium browser verification launches your app, screenshots multiple viewports, compares against design specs, and self-corrects. Native voice commands via Gemini Audio models.
Model: Gemini 3.5 Flash (1M-token context window, 65K max output). Also supports Gemini 3.1 Pro and Gemini 3 Flash.
Surfaces: Desktop app, CLI (agy), Python SDK, Managed Agents API, Enterprise Agent Platform.
Pricing: Free tier (~20 agent requests/day) • AI Pro $20/mo • AI Ultra $100/mo • AI Ultra Top $200/mo.
Replaces: Gemini CLI individual tier ends June 18, 2026. Migrate to agy.
Claude Code
Anthropic’s terminal-native coding agent. Ships as a CLI that lives in your terminal alongside git, make, and your test runner. No IDE required. Runs as a single session or in parallel fleets via tmux/amux. Supports hooks (shell commands that fire before/after tool calls for hard enforcement), skills (on-demand context loading), subagents (delegation with scoped prompts), and persistent memory across sessions.
Model: Claude Opus 4.6 (default) and Claude Sonnet 4.6. 200K context window (1M token beta via API).
Pricing: Pro $20/mo • Max 5x $100/mo • Max 20x $200/mo • API pay-as-you-go.
Strengths: Deepest agentic reasoning (Opus 4.6 leads on complex multi-file refactors). Headless mode for CI/CD pipelines. Context engineering via CLAUDE.md, hooks, and skills. Git worktree isolation for parallel agents.
Cursor v3
The most popular AI-first IDE. Cursor v3 (April 2026) rebuilt the editor around agents — inline diff preview, background agent handoff, and up to 8 parallel agents with multi-repo execution. Offers the widest model selection of any tool: Claude Opus 4.6, Claude Sonnet 4.5, GPT-5.1/5.2/5.3, GPT-4o, and Gemini 2.5 Pro, with automatic model routing in Auto mode.
Pricing: Hobby (free, limited) • Pro $20/mo • Pro+ $60/mo • Ultra $200/mo • Teams $40/user/mo.
Strengths: Best model flexibility (switch between Claude, GPT-5, and Gemini mid-session). Visual diff preview before accepting changes. Tab completions + inline chat + agent mode in one IDE. Largest user community.
GitHub Copilot
The most widely deployed AI coding tool. Now supports four agent types: Local (in-editor), Background (CLI, local-to-cloud handoff), Cloud (Coding Agent creates PRs in cloud dev environments), and Sub-Agents. Agentic code review can hand off to the Coding Agent automatically. Supports both Claude (Opus 4.5, 4.6, Sonnet 4.5, 4.6) and GPT models. Moving to usage-based billing June 2026.
Pricing: Free (limited) • Pro $10/mo (includes $10 credits) • Pro+ $39/mo • Business $19/user/mo • Enterprise $39/user/mo.
Strengths: Deepest GitHub integration (issues, PRs, Actions, code search). Largest existing user base. Most natural for teams already on GitHub Enterprise. Agentic code review → Coding Agent pipeline.
OpenAI Codex
OpenAI’s open-source CLI agent. The Codex CLI (67K+ stars, Apache 2.0, written in Rust) runs locally with cloud-based async task execution. Included with ChatGPT Plus ($20/mo), Pro ($200/mo), and Business/Enterprise plans.
Model: GPT-4o, o1, o3-mini, and other OpenAI models. The CLI itself is model-agnostic in practice.
Strengths: Open source with massive community (400+ contributors). Cloud agents for async work. Strong integration with OpenAI’s broader ecosystem (Assistants API, function calling).
Windsurf (by Cognition)
Formerly Codeium, acquired by Cognition (makers of Devin) in December 2025. The Cascade flow system provides agentic intelligence within the IDE, and integration with Devin brings autonomous agent capabilities. Proprietary SWE-1.5 model claims 13x faster inference than Claude Sonnet 4.5. Unique Codemaps feature for codebase-wide semantic understanding.
Pricing: Free (limited) • Pro $15/mo (500 credits) • Teams $30/user/mo • Enterprise $60/user/mo.
Kiro (by AWS)
AWS’s AI coding IDE. Runs Claude models via AWS Bedrock. The autonomous agent works across multiple repositories, maintains persistent context between sessions, and learns from code review feedback. Spec-driven development workflow: write a spec, Kiro generates an implementation plan, then executes it.
Pricing: Pro $20/mo • Additional credits $0.04 each.
Aider
The model-agnostic open-source CLI. Works with Claude, GPT, Gemini, DeepSeek, Llama, and 20+ other models including local ones. Completely free — you pay only for LLM API tokens. Interactive by design: waits on each prompt, keeps a human at the keyboard. No background agents, no autonomous execution.
Pricing: Free (open source). API tokens: $5–20/mo (light use with Sonnet) to $50–200+/mo (heavy use with Opus).
JetBrains Junie + JetBrains AI
JetBrains’ autonomous coding agent, launched January 2026. Plans and executes multi-step actions within IntelliJ, WebStorm, PyCharm, and other JetBrains IDEs. The Air platform is a multi-agent development environment supporting Claude Code, Codex, and Antigravity CLI alongside Junie.
Pricing: AI Pro $10/mo • AI Ultimate $30/mo • AI Enterprise custom • Plus separate IDE license.
Feature Matrix
| Feature | Antigravity | Claude Code | Cursor | Copilot | Codex | Windsurf | Kiro | Aider | Junie |
|---|---|---|---|---|---|---|---|---|---|
| Inline completions | Yes | No | Yes | Yes | No | Yes | Yes | No | Yes |
| Agent mode | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Background agents | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes |
| Multi-agent (parallel) | Yes | Yes* | 8 agents | Yes | No | Partial | Yes | No | Yes |
| Visual diff preview | Yes | No | Yes | Yes | No | Yes | Yes | No | Yes |
| Browser verification | Built-in | Via MCP | No | No | No | No | No | No | No |
| Voice commands | Yes | No | No | No | No | No | No | No | No |
| Headless / CI mode | CLI | Yes | No | Actions | Yes | No | No | Yes | No |
| Git worktree isolation | No | Yes | Partial | No | No | No | No | No | No |
| Custom hooks / rules | Settings | Hooks + rules | .cursorrules | copilot-instructions.md | Config | Rules | Specs | Config | Config |
| MCP support | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes |
| Open source | CLI only | Yes | No | No | Yes | No | No | Yes | No |
* Claude Code multi-agent via tmux/amux sessions with shared board coordination. No built-in agent count limit.
Pricing Comparison
The table below shows the real cost at each usage tier. "Power user" assumes 4–8 hours of daily agent interaction.
| Tool | Free tier | Standard | Power user | Team / Enterprise |
|---|---|---|---|---|
| Antigravity | ~20 req/day | $20/mo (AI Pro) | $100–200/mo (AI Ultra) | Enterprise Agent Platform |
| Claude Code | — | $20/mo (Pro) | $100–200/mo (Max) | $100–125/seat/mo (Team) |
| Cursor | 2K completions | $20/mo (Pro) | $60–200/mo (Pro+/Ultra) | $40/user/mo (Teams) |
| Copilot | Limited | $10/mo (Pro) | $39/mo (Pro+) | $19–39/user/mo |
| Codex | — | $20/mo (Plus) | $200/mo (Pro) | Enterprise pricing |
| Windsurf | Limited | $15/mo (Pro) | $15/mo (credit-based) | $30–60/user/mo |
| Kiro | — | $20/mo (Pro) | $20/mo + credits | TBA |
| Aider | Unlimited (OSS) | $5–20/mo tokens | $50–200/mo tokens | Self-hosted |
| JetBrains AI | 3 credits/30d | $10/mo (+ IDE) | $30–60/mo (+ IDE) | Enterprise pricing |
Background Agents Compared
Background agents — AI that works on your code asynchronously while you do other things — are the fastest-growing feature category. Here is how each implementation works:
| Tool | Execution | Sandboxing | Output | Async cloud |
|---|---|---|---|---|
| Antigravity | Agent Teams panel | Per-agent sandbox | In-IDE + PR | Yes |
| Claude Code | Headless CLI / tmux | Git worktree | Terminal + commit | Via amux |
| Cursor | Background tab | Local sandbox | In-IDE diff | Yes (v3) |
| Copilot | Coding Agent | Cloud dev environment | Pull request | Yes |
| Codex | Cloud task runner | Cloud VM | PR / patch | Yes |
| Windsurf | Cascade + Devin | Devin sandbox | In-IDE + PR | Yes |
| Kiro | Autonomous agent | Per-repo isolation | PR | Yes |
| Jules | Dedicated cloud agent | Cloud VM | Pull request | Yes |
For a deeper analysis, see our Background Coding Agents Compared guide.
Multi-Agent Orchestration
Running one agent is pair programming. Running five in parallel is a development team. Here is how each tool handles multi-agent coordination:
| Tool | Max parallel agents | Coordination method | Isolation | Shared state |
|---|---|---|---|---|
| Antigravity | Configurable (Teams) | Agent Teams panel | Per-agent sandbox | IDE workspace |
| Claude Code + amux | Unlimited (tmux) | Shared board + inter-session API | Git worktree per session | REST API (board, notes, CRM) |
| Cursor v3 | 8 | Background agent tabs | Local sandbox | Workspace state |
| Copilot | Multiple (agent types) | Local + Cloud + Sub-Agents | Cloud dev env | GitHub (issues, PRs) |
| JetBrains Air | Multiple | Air multi-agent env | Per-agent | IDE project |
AI Models Used
| Tool | Default model | Other models available | Context window | Model-agnostic |
|---|---|---|---|---|
| Antigravity | Gemini 3.5 Flash | Gemini 3.1 Pro, Gemini 3 Flash | 1M tokens | Gemini only |
| Claude Code | Claude Opus 4.6 | Claude Sonnet 4.6 | 200K (1M beta) | Claude only |
| Cursor | Auto (routed) | Claude Opus 4.6, Sonnet 4.5, GPT-5.x, GPT-4o, Gemini 2.5 Pro | Varies by model | Yes |
| Copilot | Multi-model | Claude Opus 4.5/4.6, Sonnet 4.5/4.6, GPT models | Varies by model | Yes |
| Codex | GPT-4o | o1, o3-mini | 128K | OpenAI only |
| Windsurf | SWE-1.5 | Claude, GPT, Gemini | Varies | Yes |
| Kiro | Claude (Bedrock) | Claude Opus, Sonnet, Haiku | 200K | Claude only |
| Aider | User’s choice | Any: Claude, GPT, Gemini, DeepSeek, Llama, local models | Varies by model | Yes |
| Junie | Multi-model | Claude, Codex, Gemini via Air | Varies | Yes |
The Decision Framework
Instead of asking "which tool is best?", ask "what does my workflow need?" Here is the decision tree:
You want an all-in-one IDE with AI built in
- Google ecosystem (GCP, Firebase, Android) → Antigravity 2.0
- Want widest model choice → Cursor v3
- Already on JetBrains IDEs → Junie + Air
- AWS / Bedrock ecosystem → Kiro
- Lowest cost IDE option → Windsurf ($15/mo)
You want a terminal-native agent (no IDE)
- Best reasoning + agentic autonomy → Claude Code
- Open source + OpenAI ecosystem → OpenAI Codex CLI
- Model-agnostic + full control → Aider
- Google models + replacing Gemini CLI → Antigravity CLI (
agy)
You want agents that work while you sleep
- GitHub-native PR automation → Copilot Coding Agent
- Google-native async agent → Jules
- OpenAI cloud execution → Codex
- Autonomous with persistent memory → Kiro
- Fleet of parallel overnight agents → Claude Code + amux
You want to run multiple agents in parallel
- IDE-based parallelism → Cursor v3 (up to 8) or Antigravity Agent Teams
- Terminal-based parallelism (unlimited) → Claude Code + amux
- Cross-tool orchestration → amux (coordinates any agent tool from a single dashboard)
You just want to add AI to your existing VS Code
- Easiest path → GitHub Copilot (install the extension, done)
- Want more agent features → Cursor (VS Code fork, familiar UX)
The Hybrid Stack: Using Multiple Tools Together
The most productive developers in 2026 do not pick one tool — they combine them. Here are the three most common stacks:
Stack 1: Claude Code + Cursor
Claude Code for complex, multi-file refactors and overnight autonomous work. Cursor for fast inline editing, visual diffs, and quick completions. amux coordinates Claude Code sessions in parallel while you use Cursor for the focused task at hand.
Stack 2: Copilot + Claude Code
Copilot Coding Agent for automated PR creation and review. Claude Code for complex tasks that need terminal-native control. GitHub becomes the coordination layer for the handoff: Claude Code pushes a branch, Copilot reviews and iterates.
Stack 3: Antigravity + Claude Code + amux
Antigravity 2.0 for Google ecosystem work (Firebase, GCP, Android) with browser verification. Claude Code for everything else. amux as the shared dashboard: each tool runs in its own tmux session, the kanban board tracks what every agent is working on, and the mobile PWA lets you monitor from your phone.
FAQ
Which AI coding tool is best for beginners?
GitHub Copilot is the easiest starting point — install the VS Code extension and you have inline completions immediately. Cursor is the next step up: it looks and feels like VS Code but with agent mode built in. Avoid terminal-native tools like Claude Code or Aider until you are comfortable with git, the command line, and reading diffs.
Can I use multiple AI coding tools at the same time?
Yes, and most professional developers do. The typical pattern: an IDE-based tool (Cursor or Antigravity) for interactive editing, plus a CLI agent (Claude Code or Codex) for background tasks, plus Copilot for automated PR review. amux coordinates multiple agent sessions from a single dashboard with a shared kanban board.
Is Google Antigravity free?
Antigravity has a free tier with approximately 20 agent requests per day, no credit card required. The AI Pro plan ($20/month, included in Google One AI Pro) removes rate limits. AI Ultra tiers at $100/month and $200/month provide significantly higher limits for power users. The CLI is open source.
What happened to Gemini CLI?
Google is replacing Gemini CLI with Antigravity CLI. The individual tier stops service on June 18, 2026. The Antigravity CLI (agy) is the direct successor, offering the same terminal-native workflow plus access to Agent Teams, the SDK, and Managed Agents. Enterprise Gemini CLI customers have a longer migration timeline.
How is amux different from these tools?
amux is not a replacement for any of these tools — it is the orchestration layer that coordinates them. Think of it as the control plane: each AI coding tool runs in its own tmux session, amux provides a shared kanban board for task tracking, inter-session messaging for agent-to-agent coordination, a web dashboard for monitoring, and a mobile PWA so you can check on your agent fleet from your phone. You might run 5 Claude Code sessions, 2 Cursor agents, and an Antigravity session, all coordinated through amux.
Which tool has the best AI model?
It depends on the task. Claude Opus 4.6 (used by Claude Code) leads on complex multi-file refactors and deep architectural reasoning. Gemini 3.5 Flash (used by Antigravity) offers the largest context window (1M tokens) and fast inference. GPT-5.x models (available in Cursor) offer strong general-purpose performance. Aider is fully model-agnostic if you want to pick your own. See our best AI model for coding guide for detailed benchmarks.
Should I switch from Cursor to Antigravity?
Not necessarily. Cursor v3 has broader model support (Claude + GPT-5 + Gemini), a larger community, and more mature agent features. Antigravity 2.0 has unique advantages: built-in browser verification, voice commands, and tighter Google ecosystem integration. If you are heavily invested in GCP/Firebase/Android, Antigravity is compelling. If you want model flexibility and a more established tool, stay with Cursor. Many developers will end up using both.
What about open-source alternatives?
Three strong open-source options: Aider (44K+ stars, model-agnostic CLI, interactive), OpenAI Codex CLI (67K+ stars, Rust, cloud agents), and Claude Code (open source on GitHub). For orchestration, amux is MIT-licensed. If privacy is a primary concern, Aider with a self-hosted model (via Ollama or LM Studio) runs entirely on your machine with zero data leaving your network.
Further Reading
- Background Coding Agents Compared — deep dive into Cursor, Claude Code, Devin, Copilot, and Codex background agents
- Best AI Model for Coding 2026 — benchmarks, pricing, and decision framework for 15+ models
- Context Engineering — how to structure what agents see for reliable output
- Claude Code + Cursor Hybrid Workflow — combining terminal agents with IDE editors
- Multi-Agent Orchestrator Architecture — how amux coordinates parallel agent sessions
- Measuring AI Coding Agent ROI — the 7 metrics that matter and the 5 that mislead
- AI Coding Agent Safety Checklist — 25 rules for safe agent operation
- AI Coding Agent Costs — the real total cost of ownership