U.S. AI startup Anthropic is expected to unveil its next-generation flagship model, Claude Opus 5, on July 23, according to mounting speculation. The probability of a launch on that date briefly surged to 88% on prediction market Polymarket. The new model aims to reduce total cost for enterprises running AI agents over extended periods, as current Opus 4.8 API pricing stands at $5 per million input tokens and $25 per million output tokens, down two-thirds from Opus 4's 2025 debut prices of $15 and $75. Opus 4.8 has been praised for task efficiency but criticized for insufficient stability. Competitive pressure includes OpenAI's GPT-5.6 Sol, which began rolling out on July 9 and outperformed Claude Fable 5 by 11.4 points in internal evaluations at roughly a quarter the cost. China's Moonshot AI unveiled Kimi K3 on July 16, featuring 2.8 trillion parameters and a 1-million-token context window, with API pricing at $3 per million input tokens and $15 per million output tokens—half the cost of GPT-5.6 Sol ($5 input, $30 output). Kimi K3 scored 57 on the Artificial Analysis Intelligence Index, trailing Fable 5 (60) and GPT-5.6 Sol (59) by 2–3 points.