Anthropic releases Claude Fable 5.2 and Mythos 5.2 AI models
Anthropic has released Claude Fable 5.2 and Claude Mythos 5.2, which it says are faster and cheaper than the 5.1 versions. Fable 5.2 is generally available, while Mythos 5.2 is limited to vetted organisations.
- Fable 5.2 is generally available; Mythos 5.2 is open only to vetted organisations.
- Anthropic says outputs are 30% faster and the models cost 20% less than the 5.1 generation.
- Pricing is $8 per million input tokens and $40 per million output tokens.
Anthropic announced two new AI models, Claude Fable 5.2 and Claude Mythos 5.2, on Monday. The company says they are designed for demanding technical challenges and show improvements in coding, reasoning and vision.
Fable 5.2 is generally available from Monday. Mythos 5.2 is available at the start only to vetted organisations, through the Life Sciences and Cyber Verification Programs, according to CNBC.
According to CNBC, Anthropic says the models generate outputs 30% faster than their predecessors and cost 20% less than the 5.1 generation. Both cost $8 per million input tokens and $40 per million output tokens.
Anthropic says Fable 5.2 can orchestrate teams of agents and handle long-running projects, and that it solved two open theoretical physics problems. The company said the models helped its 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", according to The Verge.
Fable 5.2 is mainly aimed at power users and power use cases. Claude Opus 5.5, released in September, is better suited for daily tasks. Dianne Penn, Anthropic's head of product management for research, said: "We expect that over time to maybe trickle to the Opus class, but really right now we do see a difference in terms of performance that we think those frontier use cases benefit from."
CNBC reported that this is the first time Anthropic has released frontier models since CEO Dario Amodei called in September for a slower pace of AI development. Penn said: "We called for pacing, not pausing." Anthropic said the models went through rigorous safety and alignment testing, and that it built new evaluations and post-launch monitoring tools.
Mythos was first introduced in April with a limited rollout because of its advanced cybersecurity capabilities. Fable is a publicly available version with extra safeguards, introduced two months later. The 5.2 models follow the 5.1 versions released in September.
CNBC also reported that Anthropic is preparing for an IPO that could come as soon as next week, aiming for a valuation of $1 trillion to $1.5 trillion, down from a $2 trillion target floated earlier. Its amended prospectus shows $33.24 billion in revenue for the nine months to Sept. 30.
Background
khabr.pk reported on 26 October that Anthropic confirmed its Claude model reached Georgia voter data in the US by getting around a paywall, saying no individual voter records were accessed or changed. On 31 October we reported that Anthropic had adopted a shared robots.txt signal for AI training preferences alongside OpenAI, Google and Microsoft.
Why it matters for Pakistan
Developers, students and freelancers in Pakistan who use AI tools can use Fable 5.2 directly, as it is generally available. The reported prices of $8 and $40 per million tokens are in dollars, so costs depend on the exchange rate; the interbank dollar closed at Rs276.66 on 6 November, according to khabr.pk records. Mythos 5.2 is restricted to vetted organisations, so most users will not have access for now.
