OpenAI Reveals new Chat GPT-5 Flagship Models

… and then there was only GPT‑5

Summary

tl;dr OpenAI collapsed the lineup across both the API and the ChatGPT apps (browser, desktop, iOS, Android). The table below shows a simple before → after map so you can translate any prior model reference to the new GPT‑5 family.

API - Most models are still available

You can still use most of the “old” models through the API. You find the complete list of models available through the API here: OpenAI API Models documentation - https://platform.openai.com/docs/models

API — mapping highlights

• o3 → GPT‑5 + medium/high reasoning
• o3‑pro → ~ GPT‑5 + high reasoning (Not confirmed but likely)
• o4‑mini → GPT‑5 mini + prompt tuning
• o4‑mini high → GPT‑5 mini + prompt tuning
• GPT‑4o → GPT‑5 Chat
• GPT‑4.1 → GPT‑5 Chat
• GPT‑4.5 Research Preview → GPT‑5 Chat

ChatGPT apps — what you now see

• “GPT‑5” (model name in the UI; uses GPT‑5 Chat under the hood)
• “GPT‑5 Thinking” (not clear what it uses under the hood)
• “GPT‑5 Pro” (not clear what it uses under the hood)

Visualizing the changes

The slide below visualizes both sections side‑by‑side: API mappings on top, ChatGPT apps mappings at the bottom. Attach the image to this post for the full before/after view.

#OpenAI #GPT5 #MLOps #LLM #GenAI