Anthropic on Monday introduced two new artificial intelligence models as the company prepares for a closely watched initial public offering.
The AI company unveiled Claude Fable 5.2 and Claude Mythos 5.2, upgrades to the previous 5.1 versions that it says are faster and less expensive.
The releases are Anthropic’s first frontier models since Chief Executive Dario Amodei publicly called for a slowdown in the development of AI models.
Claude models target complex technical work
Claude Fable 5.2 and Claude Mythos 5.2 show improvements in areas like coding, reasoning, and vision.
Anthropic said the new models are designed to tackle difficult technical challenges and are intended for ambitious, open-ended work. The company said both models are 30% faster than their predecessors and also cheaper.
The models are priced at $8 per million input tokens and $40 per million output tokens in normal mode. Anthropic is also offering a fast mode at twice the normal price.
“During prerelease testing they’ve (models) helped our engineers complete otherwise-infeasible software migrations, designed three working electronic devices from scratch, solved two open problems in the physics of black holes, made substantial progress on robotics evaluations, and formalized the proof of Fermat’s Last Theorem in 30 hours,” Anthropic said.
Fable 5.2 is available to all users. Anthropic said the model has strong safeguards against misuse in cybersecurity and biology.
Mythos 5.2, meanwhile, is available for purchase by organizations pursuing beneficial applications in cybersecurity or biomedical research, subject to verification through Anthropic’s life sciences and cybersecurity programs.
Anthropic said it had extensively tested both models for safety before releasing them. The company said the models are best suited to ambitious, open-ended technical work.
Mythos has been a highly successful model for Anthropic and played a key role in the company’s rise this year.
In its amended prospectus, Anthropic said revenue for the first nine months of 2026 increased 1,200% compared with the previous year.
IPO pricing documents withdrawn
The model releases come as Anthropic’s IPO preparations have drawn attention for a separate reason: the company withdrew preliminary pricing details that it had circulated to investment bankers.
Anthropic initially distributed paperwork proposing to sell about 867 million shares at $70 to $80 apiece, according to emails reviewed by Reuters. At the upper end of that range, the proposed sale would have generated about $69.3 billion.
A subsequent email said the pricing information was inaccurate and that an updated filing would follow.
Anthropic has not explained the error, leaving investors to assess whether it reflected a paperwork correction or a broader change in the company’s plans.
The withdrawal comes amid falling expectations for Anthropic’s valuation.
Expectations had once approached $2 trillion before moving toward $1.5 trillion as investors became more cautious about highly valued artificial intelligence companies.
Bloomberg reported on November 6 that prospective buyers were discussing a valuation of $1.2 trillion to $1.3 trillion.
AI disclosure: AI tools assisted with research and drafting of this piece. An Invezz editor reviewed the facts, sources and wording before publication. Any opinions or analysis are Invezz’s, not those of an automated system.
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