#238 - GPT 5.4 mini, OpenAI Pivot, Mamba 3, Attention Residuals

#238 - GPT 5.4 mini, OpenAI Pivot, Mamba 3, Attention Residuals

From Last Week in AI by Skynet Today

March 26, 2026 · 2h 1m · Episode 278

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…

People in this episode

Hosts: Andrey Kurenkov, Jeremie Harris

Topics covered

  • AI news
  • OpenAI updates
  • Mistral model release
  • Meta acquisitions
  • Nvidia announcements
  • Business updates
  • Safety in AI

Keywords

  • GPT-5.4 mini
  • OpenAI
  • Mistral
  • AI safety
  • Meta
  • Nvidia
  • business updates
  • Codex
  • model training

Mentioned in this episode

Organizations: OpenAI, Meta, Microsoft, ByteDance, Nvidia

Products: GPT-5.4 mini, Codex, Mistral, Small 4 model family, Manus, NeMo, DLSS 5

More episodes of Last Week in AI

Explore listener stats, chart rankings, contacts and more on the Last Week in AI podcast page.