Gemini 3.1 Pro: What's New and Should You Switch? (Review)

Google just dropped Gemini 3.1 Pro, and the benchmarks are turning heads. It now leads the Artificial Analysis Intelligence Index — 4 points ahead of Claude Opus 4.6. And it costs less than half as much to run.

So should you switch? Let's break it down.

What's Actually New

Gemini 3.1 Pro shares the same core intelligence as Gemini 3 Deep Think — Google's reasoning-heavy model — but scaled and optimized for practical, everyday use. Think of it as Deep Think's brain in a body that's fast enough to actually use in production.

Key changes from Gemini 3 Pro:

• Intelligence: Leads the overall Artificial Analysis Intelligence Index
• Speed: Significantly faster than Deep Think while retaining most of its reasoning depth
• Cost: Less than half the price of Claude Opus 4.6 per token
• Availability: Google AI Studio, Gemini CLI, Google Antigravity, Vertex AI, NotebookLM

The Benchmark Picture

The numbers tell an interesting story. Gemini 3.1 Pro wins on raw intelligence benchmarks. But Claude Opus 4.6 still leads on GDPval — which measures performance on real-world work tasks. That's the "can it actually do useful stuff" metric.

Where to Use It

Google made 3.1 Pro available across their entire ecosystem on day one:

• Google AI Studio: Free tier available, great for testing
• Gemini CLI: Terminal-based access, just got the 3.1 Pro upgrade
• Google Antigravity: Google's new agentic development platform — think of it as their answer to Claude Code
• Vertex AI: Enterprise-grade API access
• NotebookLM: Research and document analysis

For coding agent users, the Gemini CLI integration is particularly interesting. You get 3.1 Pro's intelligence at a fraction of the cost of Claude Code.

For Agent Users: What This Means

If you're running an AI agent (OpenClaw, custom setup, whatever), Gemini 3.1 Pro changes the cost equation significantly.

At less than half the cost of Claude, you could route routine tasks — email drafting, summarization, research, scheduling — through Gemini and save 50-70% on your monthly API bill. Keep Claude for the complex, multi-step agentic work where it still excels.

This hybrid approach is quickly becoming the standard. We covered it in depth in our Claude vs Gemini comparison.

Google Antigravity: The Sleeper Hit

Buried in the Gemini 3.1 Pro launch was something potentially more important: Google Antigravity getting full 3.1 Pro support. Antigravity is Google's agentic development platform — it lets you build AI agents that can use tools, browse the web, write and execute code.

With 3.1 Pro powering it, Antigravity becomes a serious contender in the agent development space. It's Google's bet that the future of development is agentic, and they want to own the platform.

What's Not Great

Let's be honest about the limitations:

• Sustained agentic work: Claude still handles long, complex multi-step tasks better. Gemini tends to lose context in very long agent loops.
• Coding depth: For deep codebase understanding and complex refactoring, Claude Code is still ahead.
• Personality: Gemini's responses can feel more generic. Claude has a more distinctive, thoughtful voice.
• Tool use reliability: Claude's tool calling is still more consistent in edge cases.

The Verdict

Gemini 3.1 Pro is the best value-for-intelligence ratio in AI right now. Full stop. If you're paying for AI and not at least evaluating Gemini, you're overspending.

But "best value" doesn't mean "best for everything." Claude Opus 4.6 is still the model you want for sustained agentic work — the kind where an AI agent needs to maintain context across dozens of tool calls and multi-step reasoning chains.

Our recommendation: Use both. Gemini 3.1 Pro for routine tasks and quick queries. Claude for complex work. Your wallet will thank you.

The AI model landscape is moving fast — if you want help figuring out which models make sense for your agent stack, that's exactly the kind of thing we help with.