Anthropic's latest Fable 5.1 model jumps to the top of LLM leaderboards

Anthropic launched a new model on September 1 called Claude Fable 5.1. 

The model immediately claimed the number one spot on Artificial Analysis’s intelligence leaderboard with a score of 66 on the site’s index, dethroning Opus 5 in the process.

Fable 5.1 and Opus 5 sit atop the leaderboard

Artificial Analysis ranks over 250 language models on price, speed, and intelligence. It now ranks two Fable 5.1 iterations first and second on the table. The site scores the “max with fallback” at 66, while scoring the “xhigh with fallback” at 65. 

Both tower above former leader Claude Opus 5 with a score of 63 in its max and xhigh modes.

That means Anthropic has the top four spots on a leaderboard that has models from top AI labs like OpenAI, Google, SpaceXAI, Alibaba, and DeepSeek. The closest to any Anthropic model is  OpenAI’s GPT-5.6 Sol at max mode and SpaceXAI’s Grok 4.6, both scoring 61. 

The ranking comes from an independent party, giving it more validity than a lab’s own charts.  

… Continue reading the full article at the original source below.