#238 - GPT 5.4 mini, OpenAI Pivot, Mamba 3, Attention Residuals
About this episode
The episode discusses significant AI news from the previous week, including OpenAI's release of GPT-5.4 mini, Mistral's model updates, and various business and safety developments in the AI sector.
Our 238th episode with a summary and discussion of last week's big AI news! Recorded on 03/18/2026 Hosted by Andrey Kurenkov and Jeremie Harris Feel free to email us your questions and feedback at andreyvkurenkov@gmail.com and/or hello@gladstone.ai Read out our text newsletter and comment on the podcast at https://lastweekin.ai/ In this episode: * OpenAI released GPT-5.4 mini and nano with 400k-token context windows, higher per-token prices but claimed token-efficiency gains in Codex; nano is API-only and pitched for high-volume classification/data extraction despite a major price increase. * Mistral open-sourced the Small 4 model family (MoE, 119B total/6B active) combining reasoning, multimodal, and coding-agent capabilities, and announced Forge to help businesses train or post-train custom models. * Agent “operating system” competition intensified with Meta’s acquired Manus launching a local Mac agent, Nvidia announcing NeMo/“Open Shell” sandboxed agent runtime, and Nvidia also unveiling DLSS 5 plus major hardware forecasts including Groq LPU integration. * Business and safety updates included OpenAI shifting focus toward productivity/enterprise amid competition…
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