Claude Code vs Gemini CLI: Which Terminal Agent (2026)

For a stable, deeply extensible terminal agent you can build a team workflow around, pick Claude Code. Pick Gemini CLI for open-source TypeScript hackability and Gemini's free tier — but note the June 18, 2026 cutover that stops serving free/Pro/Ultra users and steers them to the new Antigravity CLI.

Key takeaways

Claude Code is first-party Anthropic tooling (not open source) with a deep programmable harness — MCP, subagents, hooks, skills, plugins — tuned for Anthropic's Opus 4.x / Sonnet models.

Gemini CLI is open source (Apache-2.0, TypeScript, ~105K stars), runs Gemini 3 with a 1M-token context, and shipped with a generous free tier on a personal Google account.

Major caveat: on June 18, 2026 Google stops serving Gemini CLI for free, Pro, and Ultra users, transitioning individuals to the new Go-based Antigravity CLI; only Standard/Enterprise license holders keep it unchanged.

Both expose 1M-token context and MCP; Claude Code adds subagents/hooks/skills for governed team workflows, while Gemini CLI leans on open-source extensions and config.

Model allegiance and your tolerance for the Antigravity migration decide it more than raw features.

Claude Code and Gemini CLI both put an agent in your terminal, but they sit on opposite sides of an old trade: first-party stability and depth versus open-source reach and a free tier. As of mid-2026 that trade comes with a wrinkle — Gemini CLI is mid-transition to a different tool.

The short answer

You want a stable, deeply extensible agent to build team workflows on (MCP, subagents, hooks, skills) → Claude Code.
You want open-source TypeScript you can fork and a big free tier on a Google account → Gemini CLI — but read the migration note below.
You're an individual relying on Gemini's free tier → know that Antigravity CLI, not Gemini CLI, is where Google is sending you after June 18, 2026.

What each is

Claude Code is Anthropic's first-party terminal agent — closed-source, but a deep programmable harness. The agentic loop runs end to end (plan, edit, run tests, open the PR), and everything around it is extension surface: MCP servers for reach, subagents for delegation, hooks for deterministic rules, plus skills and plugins for packaged workflows. It's tuned for Anthropic's models (Opus 4.x, Sonnet), reads CLAUDE.md, and is git-native. There's no free agent tier — it runs through Pro/Max plans or an API key.

Gemini CLI is Google's open-source terminal agent — Apache-2.0, TypeScript, ~105K GitHub stars. It runs Gemini 3 with a 1M-token context window, supports MCP and community extensions, and launched with a standout free tier (on a personal Google account). The catch is timing: at Google I/O on May 19, 2026, Google announced it's consolidating tooling under Antigravity. On June 18, 2026, Gemini CLI stops serving free, Pro, and Ultra users — they're pushed to the new Go-based Antigravity CLI — while only Standard/Enterprise license holders keep it unchanged.

Dimension by dimension

	Claude Code	Gemini CLI
Models	Anthropic (Opus 4.x, Sonnet), tuned	Gemini 3 (1M-token context)
Pricing / free tier	Paid (Pro/Max) or API key; no free agent	Big personal-account free tier — ending June 18, 2026 for individuals
Open source	No (first-party Anthropic)	Yes — Apache-2.0, TypeScript
Context window	1M tokens at standard pricing	1M tokens
Extensibility / MCP	MCP + subagents + hooks + skills + plugins	MCP + open-source extensions + config
Ecosystem	Anthropic, Agent SDK, GitHub Action	~105K stars, but transitioning to Antigravity CLI

How to choose

The honest decider in June 2026 is continuity. If you depend on Gemini CLI as an individual, you're a day from the cutover: the tool itself keeps running as an open-source repo, but Google's hosted free/Pro/Ultra access ends June 18, and the official path forward is Antigravity CLI — a different tool (rewritten in Go, agent-first) that, by Google's own framing, is still catching up feature-for-feature. That's real migration risk for anyone betting a workflow on it now.

Claude Code's trade-off is the inverse: you give up open-source forkability and a free agent tier, but you get a stable first-party target with the deepest extensibility in the field. Its failure modes are cost (no free loop) and lock-in to Anthropic's models — switching providers isn't its lane.

So: pick Gemini CLI if open-source ownership and Gemini's economics matter more than stability, and you're comfortable following the Antigravity migration. Pick Claude Code if you're encoding team policy or building durable workflows on a harness that won't move under you. If model freedom across providers is the real requirement, neither is the answer — see the open-source CLI field and OpenCode's comparison. And if your alternative is OpenAI's terminal agent, weigh Claude Code vs Codex CLI instead.

Frequently asked questions

Is Gemini CLI being shut down in 2026?

For individuals, effectively yes. Google announced at I/O on May 19, 2026 that on June 18, 2026 Gemini CLI stops serving free, Pro, and Ultra tier users, steering them to the new Antigravity CLI (built in Go). Only Standard and Enterprise license holders keep Gemini CLI unchanged. The open-source repo remains up, but consumer model access ends on that date.

Is Claude Code or Gemini CLI better for a team?

Claude Code, in most cases. Its permission rules, hooks, subagents, and skills let you encode team policy and reusable workflows, and as first-party Anthropic tooling it's a stable target to build on. Gemini CLI is excellent for solo open-source hacking, but the 2026 Antigravity transition makes it a moving target for individual users right now.

Which has the bigger free tier, Claude Code or Gemini CLI?

Historically Gemini CLI — its personal-account free tier offered up to ~1,000 requests/day on Gemini models, with no equivalent free agent loop in Claude Code (which runs through paid Pro/Max plans or an API key). But that free access is exactly what the June 18, 2026 cutover removes for individuals, so the advantage is shrinking.