DeepSeek‑r1, o3‑mini & Gemini Flash 2.0: Which model should you use in your AI Agents?

From the creator

🤖 Download the full source code here: 👉 https://brandonhancock.io/ai-agent-comparison Don’t forget to Like & Subscribe for more high-quality AI tutorials and free resources! 🎉 📆 Need help with AI development? Join my FREE AI Developer Accelerator Skool Community for weekly coaching calls and exclusive insights: 👉 https://www.skool.com/ai-developer-accelerator/about 📰 Stay Updated with My Latest Projects: LinkedIn: https://www.linkedin.com/in/brandon-hancock-ai/ Twitter/X: https://twitter.com/bhancock_ai New AI models just dropped, but which one is best for AI agents? I tested O3 Mini, Gemini Flash 2.0, and DeepSeek-R1 inside CrewAI against Claude 3.5 & GPT-4o to find out. We put them through three real-world tests inside CrewAI: Instruction Overload – Can they follow complex, rule-heavy prompts? Tool Calling Challenge – How well do they handle multi-step tool calls? Needle in a Haystack (RAG Test) – Which model retrieves and processes massive data best? Some models performed surprisingly well, while others struggled. Watch the breakdown to see the results! Timestamps: 00:00 – Start 01:09 – Model Overview 02:56 – Test #1: Instruction Overload 15:33 – Test #2: Tool Calling Challenge 22:21 – Test #3: Needle in a Haystack (RAG Performance) 29:37 – Final Recommendation

Choose to Build with AI
Matched to AI Agents

AI Maker Residence 3

The third AI workshop taught by our legendary teacher, Nick Sarafa. This is a full-day hands-on training workshop for purposeful co-creation with AI using Claude Code. Imagine having access to hundreds of billions of dollars of computing power and knowing exactly how to make it work for you through the power of super intelligence.

◆ Fri 09 Oct 2026 ◆ KOKO Cafe, London ◆ With Nick Sarafa
AI Maker Residence 3
Live event
AI Maker Residence 3
Fri 09 Oct 2026

More like this

Running one yourself?

List your AI event,
wherever it is.

A meetup, a workshop, a hackathon, a conference. Any city, or online. Tell us about it and it lands in front of people already learning this stuff.