Google Antigravity vs Claude Code vs Codex: The Real Test

Three AI coding tools, three completely different brains underneath the same prompt box. Here's how Google Antigravity, Claude Code, and Codex really compare in 2026. We test Google Antigravity (Gemini 3.5 Flash), Anthropic's Claude Code (Opus 4.7), and OpenAI's Codex (GPT-5.5) on the things that decide which one fits your workflow: raw speed, reasoning depth, autonomy, rule-following, and the daily supervision cost. No screenshots, no demos — just the trade-off curves. Chapters 00:00 — Three tools, one prompt box 00:48 — How the editor died and the agent took over 01:52 — The 30-second split: Flash vs Opus vs GPT-5.5 03:35 — The token trap (why cheap tokens are not cheap) 04:46 — The rules test: which agent follows your style guide 06:24 — The supervision tax you pay every day 07:45 — Pick the brain, not the prompt box What's covered • Why Google Antigravity, Claude Code, and Codex converged on the same UX in 2026 • Gemini 3.5 Flash 280 tok/s speed vs Opus 4.7 depth on SWE-bench Pro (64 vs 55) • The $200/month price ceiling on Claude Max and Google AI Ultra • Why Opus 4.7 obeys CLAUDE.md and Flash drifts on simple project rules • Hooks, approvals, and the supervision cost of each AI coding agent • Which AI coding tool fits a solo dev vs a fleet manager What is Google Antigravity? Antigravity 2.0 is Google's agentic IDE: it strips out the editor and replaces it with a dashboard to manage a fleet of Gemini-powered agents. Claude Code is Anthropic's terminal-first AI coding agent, pairing Opus 4.7 with a 25-point hooks system for fine-grained control. OpenAI's Codex runs GPT-5.5 in a cloud sandbox and ships finished pull requests back to you. Three different bets on how developers will work in 2026. More Devsplainers • Channel —    / @devsplainers   Sources & citations • Introducing Google Antigravity 2.0 — https://antigravity.google/blog/intro... • Antigravity I/O 2026 Feature Deep Dive — https://antigravity.google/blog/googl... • Anthropic Claude Code — https://www.anthropic.com/product/cla... • Claude Code docs — https://code.claude.com/docs/en/overview • Gemini 3.5 Flash model card — https://deepmind.google/models/model-... • Artificial Analysis (speed benchmarks) — https://artificialanalysis.ai • Appwrite: Gemini 3.5 Flash deep dive — https://appwrite.io/blog/post/gemini-... • SWE-bench Verified leaderboard — https://www.vals.ai/benchmarks/swebench • DataCamp: Claude Code vs Antigravity — https://www.datacamp.com/blog/claude-... • CloudZero: Claude Code pricing breakdown — https://www.cloudzero.com/blog/claude... • Google AI subscriptions (I/O 2026) — https://blog.google/products-and-plat... • r/google_antigravity I/O 2026 megathread —   / megathread_everything_announced_at_google_...   • The New Stack: AI coding tool stack convergence — https://thenewstack.io/ai-coding-tool... #ClaudeCode #GoogleAntigravity #AICoding #Codex #AIAgents