AI Model Leaderboard: Claude Fable 5 Leads, GPT-5.6 Gains

Anthropic continues to lead the AI model leaderboard, with Claude Fable 5 topping the Artificial Analysis Intelligence Index. What's interesting is that OpenAI is narrowing the gap with its GPT-5.6, and Moonshot AI has entered the race with Kimi K3. Polymarket currently prices Anthropic at 86.0% to hold the best Large Language Model spot through April 30. This market has seen $39.3K in cumulative volume. xAI also shipped Grok 4.5, bringing the total to six AI labs with models scoring above 50 on the benchmark. Anthropic has held the top spot every month since February and is projected to continue this streak. This information helps us understand the current competitive landscape in the rapidly evolving AI industry.