OpenAI releases GPT-4.5 (Orion) 🚀

Codename Orion 🚀 🌌

On February 27, 2025, OpenAI launched GPT-4.5, codenamed "Orion," as its most advanced model to date. GPT-4.5 focuses on natural conversation, reduced hallucinations, and improved general-purpose capabilities. OpenAI started using a System Card to share details including safety, benchmark, and training strategy.

Here are the highlights of GPT 4.5:

• Performance: Excels in factual accuracy (PersonQA: 0.78) and multilingual tasks (MMLU English: 0.896), with a lower hallucination rate (0.19), helicone.ai.

• New Base Model: Replaces previous models as the core for OpenAI’s reasoning systems, emphasizing natural dialogue.

• Limitations: Strong in practical tasks but lags in complex reasoning compared to specialized models (vellum.ai)

• Rollout: The rollout was staggered due to GPU shortages, with plans to expand access to other tiers.