On September 3, OpenAI released its GPT-6 Astra model, which, according to the latest evaluation by Artificial Analysis, ranks first in performance alongside Anthropic's Claude Fable 5.1. OpenAI has priced Astra's API at 2.5 times the unit cost of its predecessor, GPT-5.6 Sol, and has begun exploring a "pay-per-task-effectiveness" model. Concurrently, Anthropic released Claude Fable 5.1, maintaining its base unit price but reducing the cached read price by 75% to $0.25 per million tokens, which is expected to lower the cost of typical workloads by approximately 25% to 45%. Both companies have secretly filed for IPOs, aiming for a trillion-dollar valuation.