Anthropic's Claude 4 Opus Looms as OpenAI Scrambles to Defend the Frontier: The Summer 2025 Model War Heats Up
With Anthropic reportedly finalizing Claude 4 Opus and OpenAI having just shipped GPT-4.5 and o3, the frontier model race is entering its most consequential stretch yet. Here's what the capability gap, the safety disclosures, and the regulatory backdrop actually mean.
Sarah Brennan





