OpenAI launches GPT-6 Astra; Anthropic debuts Claude 5.1 series with major cost cuts

OpenAI introduced GPT-6 Astra, presented as its most intelligent and aligned model, with ‘computer-operator’ capabilities and a ‘Critical’ cybersecurity rating restricted to the Daybreak program. Anthropic released Claude Fable 5.1/Mythos 5.1 and cut cached context read prices by 75%, reducing effective costs by up to ~45% for highly agentic workloads.