Sharp Tech with Ben Thompson · Thursday, September 3, 2026
Anthropic is stressing that Fable 5.1 and Mythos 5.1 are the exact same AI model. This clarification comes as companies face increasing pressure to justify and control AI usage costs, especially with the rise of more capable, lower-cost models from China.
“Anthropic stress that it is the exact same model as Mythos 5.1.”
“Why did they stress that Fable and Mythos are the same model?”
“Companies are increasingly trying to justify and rein in the cost of AI usage at a time when open weights, lower cost models from China are rapidly improving.”