#gpt

OpenAI has added three new voice models with reasoning capabilities to the Realtime API, enabling developers to build low-latency voice applications powered by GPT-5-class intelligence.

OpenAI replaced GPT-5.3 Instant with GPT-5.5 Instant as ChatGPT's default model for all users including free tier on May 5. The model delivers smarter, more concise answers with improved personalization based on past chats, files, and Gmail integrations.

growingSWE has created an interactive walkthrough of Andrej Karpathy's 200-line pure Python GPT implementation, letting you tokenize names, watch softmax convert scores to probabilities, step through backpropagation, and explore attention heatmaps.