Anthropic Joins AI Price War With Release of Fable 5.1

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Anthropic introduced Fable 5.1 and Mythos 5.1, highlighting how it is addressing pricing concerns for enterprise customers. However, despite the powerful capabilities of Fable 5.1 and Mythos 5.1, enterprises don’t always need the most powerful model for their workloads.

The AI lab on Sept. 1 revealed that Fable 5.1 and Mythos 5.1 are the same models, except that Mythos 5.1 is accessible only to authorized users as part of its Project Glasswing cybersecurity initiative and includes distinct levels of safeguards.

The vendor said that, along with increased capabilities in advanced coding and knowledge work, and improved research skills in science fields, Fable 5.1 costs 25% less than Fable 5 for typical workloads because it reduces cache read pricing. Cache read is when the model reads the inputs that have already been processed or stored. This means Fable 5.1 pricing is reduced from $1 per million tokens to $0.25 per million tokens. Other than this difference, the standard input pricing remains $10 per million input tokens and $50 per million output tokens. The standard pricing is still significantly higher than OpenAI’s GPT-5.6 Sol, which is $5 per million input tokens and $30 per million output tokens.

Fable 5.1’s price cut reveals the vendor’s strategy in dealing with the escalating price war in the AI market. In addition to Anthropic, OpenAI, Google and Microsoft are competitively reducing their prices as the cost of AI becomes harder to contain, while enterprises are trying to determine the ROI and use cases for frontier models.

“We are at a juncture where token consumption is a big concern,” said Lian Jye Su, an analyst at Omdia, a division of Informa TechTarget.

Pricing and Anthropic’s IPO

Su added that while vendors have begun to reduce prices, enterprises have started finding their own ways to address the pricing issue.

“It needs to have this solid recurring revenue to ensure that its valuation continues to stay on top,” Su said.