Yining Chen

📐 OpenAI GPT-5 will be a steady step that lifts coding, math, and agent control, not another giant jump from GPT-3 to GPT-4. According theinformation report. OpenAI hit three big snags at once: fresh data dried up, reinforcement learning runs kept wobbling, and the Orion model never lived up to its hype. To keep things on track, the team built a universal verifier, an extra model that grades every answer during reinforcement learning and only lets the solid ones loop back into training so the next model starts from cleaner, more reliable examples. OpenAI spent early 2024 training a bigger model called Orion to replace GPT-4, but the tweaks that helped small test runs failed to scale and clean new data was scarce, so results stayed close to GPT-4 while costs kept rising. Because of that, the company rebranded Orion as GPT-4.5 rather than GPT-5 and shifted its focus to other training tricks Teams pivoted to o-series reasoning models, adding more NVIDIA GPUs and code search; raw problem solving rose but quality dipped once the model had to chat in plain English. GPT-5 folds those lessons together: it scales compute per query, writes cleaner interfaces, handles tricky refunds, and lets the universal verifier grade thousands of synthetic answers.