Dario Amodei, co-founder and CEO of Anthropic, during an interview at Anthropic headquarters in San Francisco, California, United States, Thursday, April 30, 2026.
Jason Henry | Bloomberg | Getty Images
Anthropic released two new artificial intelligence models, Claude Fable 5.2 and Claude Mythos 5.2, on Monday, as the company prepares for a potentially historic IPO that could happen as soon as next week.
Fable 5.2 and Mythos 5.2 are Anthropic’s most advanced offerings, and the company said they generate releases 30% faster than their predecessors. The models also cost 20% less than generation 5.1 and will be available for $8 per million input tokens and $40 per million output tokens, the company said.
The launch marks the first time Anthropic has launched so-called “frontier” models since its CEO, Dario Amodei, called for slowing the pace of AI development in September. Anthropic said the models underwent rigorous safety and alignment testing, and the company developed new assessments and post-launch monitoring tools ahead of release.
“We called for pacing, not pausing,” Dianne Penn, head of product management for research at Anthropic, told CNBC in an interview.
Anthropic must balance its security efforts with intense business and competitive pressures, a tension the company highlighted in the detailed risk factors section of its prospectus late last month. And as executives prepare to launch Anthropic’s IPO roadshow, they will need to convince investors that their approach is the right one.
The company is targeting a valuation of $1 trillion to $1.5 trillion in its offering, as CNBC previously reported, down from the $2 trillion target that had been floated in recent months.
Anthropic first introduced Mythos in April and limited deployment to a select group of organizations due to the model’s advanced cybersecurity capabilities. The company introduced Fable, a publicly available version of Mythos with additional safeguards, two months later.
The models — especially Mythos — captivated Wall Street and government officials, and helped fuel Anthropic’s meteoric rise this year. The company said in its amended prospectus that it generated revenue of $33.24 billion for the nine months ended September 30, up about 1,200% from the same period last year.
Penn said Fable 5.2 is primarily aimed at “power users or power use cases” because it excels at complex, open-ended technical work. Other models like Claude Opus 5.5, released by Anthropic in September, are better suited to everyday tasks. So Penn said users should turn to Fable 5.2 when they need to solve difficult problems in engineering, math and robotics.
“These are just new things that are completely new, and so these are pioneering use cases,” Penn said. “We expect that over time maybe this will trickle down to the Opus class, but right now we’re seeing a difference in performance that we think these frontier use cases benefit from.”
Anthropic said Fable 5.2 was generally available Monday and Mythos 5.2 was available to audited organizations through the company’s life sciences and cyber audit programs.
WATCH: Anthropic’s meteoric rise: What you need to know before the IPO
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