Research

We Tested GPT-5.5 for Offensive Security. It's Good.

We tested GPT-5.5 for offensive security. It's good.

OpenAI dropped GPT-5.5. We ran it through our platform. Here's the short version: GPT-5.5 is now the best model for offensive security work.

Where GPT-5.5 Wins

• Automation — runs tasks with less hand-holding.
• Tool chaining — connects multi-step attacks reliably.
• Scaling pentests — handles parallel workflows better.
• Platform building — ideal for autonomous security systems.

Where Opus 4.7 Still Leads

• Deep reasoning attacks.
• Logic flaw detection.
• Codebase understanding.

What This Means

For building automated pentesting platforms — like what we do at Strike7 — GPT-5.5 is the new default. It's faster, chains better, and needs less supervision. Opus still has an edge when you need deep analysis on complex logic flaws. Different tools for different jobs — but for autonomous offensive security at scale, GPT-5.5 just took the lead.