AI Briefing, March 6 · Issue 86
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## 🔍 Key Insights
**GPT-5.4** has officially launched, redefining knowledge work with **1M-token context windows** and **native computer-use capabilities**; meanwhile, a **DRAM shortage** has prompted Apple to revise high-end Mac Studio configurations—highlighting the tangible impact of AI hardware demand on global supply chains.
## 🚀 Major Updates
- **OpenAI launches GPT-5.4**: Features **native computer use** and **1M-token context**, dramatically enhancing performance on complex knowledge tasks
- **GPT-5.4 enables hands-on guidance in Codex**: Developers can manually activate million-token context support by editing the `config.toml` file
- **Arena releases cutting-edge model benchmarks**: Horizontal comparison of **GPT-5.4**, **Claude 4.6**, and **Gemini 3.1** across reasoning, coding, and multimodal tasks
- **Apple discontinues the 512GB memory option for Mac Studio**: Driven by **DRAM shortages** and surging **AI workload demands**, the 256GB configuration has also increased in price
- **Andrej Karpathy shares progress on nanochat agent iteration**: The AI agent now achieves **autonomous codebase optimization**, completing full GPT-2 training in just **2 hours**
- **New benchmark for agent efficiency established**: Focuses on measuring real-world **iteration speed** and **code quality improvement** when agents enhance open-source projects (e.g., nanochat)
- **Cal Newport introduces “Slow Productivity” to counter attention collapse**: Advocates for structured cognitive training to rebuild **deep focus**, resisting fragmentation in the AI era