AI Brief Weekly

Feb 22 – Feb 28, 2026

AI's Monumental Week: GPT-5, Claude 4, Regulatory Milestones, and a Shifting Competitive Landscape

• OpenAI launched GPT-5, introducing native multimodal reasoning across text, image, and code with significant performance gains.
• Anthropic unveiled Claude 4, boasting an industry-leading 1M token context window for enhanced long-document understanding and reduced hallucinations.
• Anthropic's Claude chatbot surged to the No. 1 spot in the App Store, driven by increased public attention following its Pentagon negotiations.