GPT-5.5 Coding Agent: How OpenAI’s Most Powerful Model is Changing Software Development
Table of Contents What Is GPT-5.5 and Why It Matters GPT-5.5 Benchmarks: The Numbers Don’t Lie The Four Core Capabilities Real-World Impact for Developers Who Should Use GPT-5.5 Coding Agent GPT-5.5 vs The Competition Conclusion: Is GPT-5.5 Worth It What Is GPT-5.5 and Why It Matters On April 23, 2026, OpenAI quietly dropped what may be the most consequential AI release of the year — GPT-5.5, internally codenamed “Spud.” Unlike its predecessors that primarily excelled at conversational tasks, GPT-5.5 represents a fundamental shift: OpenAI is no longer positioning its flagship model as a “chatbot.” Instead, GPT-5.5 is being marketed and