How to Make an AI Agent in 2026 (After GPT-5.5 Drops)

Key Takeaways OpenAI shipped GPT-5.5 Instant on May 5, 2026 with a claim of 52.5% fewer hallucinated facts on high-stakes prompts and 37.3% fewer on user-flagged factual errors. Every number is from OpenAI's own evaluations. No third-party leaderboa...