Anthropic launches Claude Fable 5.2 and Mythos 5.2 with price cuts and scientific benchmarks
Anthropic has released Claude Fable 5.2 and Claude Mythos 5.2, introducing faster performance, reduced token pricing, and high-level technical benchmarks spanning mathematics, physics, and hardware engineering.
Anthropic launched its latest flagship AI models, Claude Fable 5.2 and Claude Mythos 5.2, describing them as optimized for open-ended, complex technical tasks. Output speeds run up to 30% faster than the 5.1 versions, alongside enhancements across coding, reasoning, vision, and user communication.[1][2][3][5][10]
Standard API access for both models is priced at $8 per million input tokens and $40 per million output tokens, a 20% discount from the 5.1 generation, Frederic Lardinois reported for The New Stack. Anthropic also introduced a fast mode priced at $16 per million input tokens and $80 per million output tokens, delivering token generation up to 2.5 times faster. Following the release, Claude Mythos 5.2 took first place on Artificial Analysis's Intelligence leaderboard.[1][2][6][8][13]
Anthropic highlighted several prerelease milestones in advanced science and math, as reported by Jay Peters of The Verge. The company stated the models formalized a proof of Fermat's Last Theorem and solved two open problems in black hole physics, including a 23-year-old calculation that was published as preprints. Additionally, Fable 5.2 designed three electronic devices that partner Diode manufactured without requiring circuit changes, while Mythos 5.2 modeled viral protein shells for gene therapies, accurately capturing 28 out of 34 cases.[4][11][14][15][16]
The launch marks Anthropic's first frontier release since chief executive Dario Amodei publicly advocated for an AI development slowdown, arriving alongside continued market speculation regarding an eventual initial public offering.[7][9][12][17]
Key facts
- Anthropic officially released Claude Fable 5.2 and Claude Mythos 5.2 on November 9, 2026.
- Standard token pricing is set at $8 per 1 million input tokens and $40 per 1 million output tokens, a 20% decrease compared to 5.1.
- A new fast mode costs $16 per million input and $80 per million output tokens, offering up to 2.5 times faster token generation.
- Anthropic reported that prerelease testing saw the models formalize Fermat's Last Theorem proof and solve two open black hole physics problems.
- Fable 5.2 designed three electronic devices manufactured by partner Diode that functioned without circuit modifications.
- Mythos 5.2 claimed the top position on Artificial Analysis's Intelligence leaderboard.
- This marks Anthropic's first frontier release since CEO Dario Amodei called for an AI development slowdown.
Sources · 11 sources
- TE
Techmeme@TechmemePost on X ·
Anthropic prices Fable 5.2 and Mythos 5.2 at $8/1M input and $40/1M output tokens, down 20% from 5.1; fast mode costs $16/1M input and $80/1M output tokens (@fredericl / The New Stack) (Visit Techmeme dot com for the link and full context!)
Open source - TE
TechmemeArticle ·
Anthropic prices Fable 5.2 and Mythos 5.2 at $8/1M input and $40/1M output tokens, down 20% from 5.1; fast mode costs $16/1M input and $80/1M output tokens (Frederic Lardinois/The New Stack) Frederic Lardinois / The New Stack : Anthropic prices Fable 5.2 and Mythos 5.2 at $8/1M input and $40/1M output tokens, down 20% from 5.1; fast mode costs $16/1M input and $80/1M output tokens — On Monday, Anthropic launched Claude Fable 5.2 and Mythos 5.2, the latest versions of its duo of flagship models.
Open source - TE
TechmemeArticle ·
Anthropic releases Mythos 5.2 and Fable 5.2, saying they are "best for the most ambitious, open-ended technical work", with outputs up to 30% faster than 5.1 (Anthropic) Anthropic : Anthropic releases Mythos 5.2 and Fable 5.2, saying they are “best for the most ambitious, open-ended technical work”, with outputs up to 30% faster than 5.1 — We've upgraded Claude Fable and Claude Mythos—models that are designed to tackle the most daunting technical challenges.
Open source - TE
Techmeme@TechmemePost on X ·
Anthropic says during prerelease testing Mythos 5.2 and Fable 5.2 formalized the proof of Fermat's Last Theorem and solved two open black hole physics problems (@jaypeters / The Verge) (Visit Techmeme dot com for the link and full context!)
Open source - TE
TechCrunch@TechCrunchPost on X ·
Anthropic says the new models "show improvements in areas like coding, reasoning, and vision," as well as in communicating more clearly with users. https://t.co/jRbH5vFbln
Open source - MA
Mashable@mashablePost on X ·
Anthropic announced Claude Fable 5.2 and Mythos 5.2. The latter model claimed the top spot on Artificial Analysis's Intelligence leaderboard. Anthropic says the new frontier models have already solved open problems in black hole physics. Here's what we know so far, including how to try the new models. https://t.co/eQIczFx0rD
Open source - CN
CNBC@CNBCPost on X ·
Anthropic releases first frontier models since Amodei's call for slowdown as IPO buzz builds https://t.co/sdvjG1GJ3U
Open source - TN
The New Stack@thenewstackPost on X ·
Claude Fable 5.2 cuts token prices by 20% and leads Anthropic’s coding comparisons, while a new Fast mode promises up to 2.5 times faster token generation. https://t.co/cjoPDUPKOs
Open source - CB
Crypto BriefingArticle ·
Anthropic releases Claude Fable 5.2 and Mythos 5.2 two months after CEO urges AI slowdown Anthropic's Claude Fable 5.2 enhances accessibility and efficiency in AI applications, potentially broadening its adoption in technical fields. The post Anthropic releases Claude Fable 5.2 and Mythos 5.2 two months after CEO urges AI slowdown appeared first on Crypto Briefing .
Open source - *B
*Walter Bloomberg@DeItaonePost on X ·
ANTHROPIC: CLAUDE FABLE 5.2 AND CLAUDE MYTHOS 5.2 ARE AVAILABLE NOW
Open source - CH
Chubby♨️@kimmonismusPost on X ·
While we’re all focused on Claude Fable 5.2’s coding abilities, its work in science and engineering has received far less attention. Anthropic has made insane steps and solved crazy hard problems that many missed: - Hardware: Fable 5.2 designed three electronic devices from short prompts, including their circuit boards, enclosures and software. Partner Diode built them, and all three worked without changes to their circuitry. - Gene therapy research: Mythos 5.2 developed a method to model the complex protein shells of viruses used to deliver gene therapies. In Anthropic’s test, it accurately modeled 28 out of 34. - Chemistry: An early version of Mythos 5.2 planned ways to synthesize complex molecules. Three chemists rated the work around the level of an early PhD student. - Physics: Anthropic says Fable 5.2 solved two open theoretical physics problems involving black holes. The results have been published as preprints. - Materials science: Discovered Materials says Fable 5.2 made a calculation used to check material stability 36 times faster on average. Across 13 test cases, the total time fell from 3.3 hours to under four minutes. - Robotics: In Anthropic’s simulated RoboDojo test, Fable 5.2 achieved a 64.9% average success rate, up from 27.6% for Fable 5.1. So yeah, this is nuts. And at the same time thats why we need to accelerate. AI helps us solve problems in *ever* scientific field. And yet, we are still in 2026, and this is still the beginning. Fable 5.2 shows us where we are heading. And 2027 is going to nuts.
Open source - CB
Crypto BriefingArticle ·
Anthropic unveils Fable and Mythos AI models ahead of IPO Anthropic's new AI models could bolster its market position and influence its competitive edge in the AI sector ahead of its IPO. The post Anthropic unveils Fable and Mythos AI models ahead of IPO appeared first on Crypto Briefing .
Open source - TE
Techmeme@TechmemePost on X ·
Anthropic releases Mythos 5.2 and Fable 5.2, saying they are "best for the most ambitious, open-ended technical work", for $8/1M input and $40/1M output tokens (Anthropic) (Visit Techmeme dot com for the link and full context!)
Open source - CB
Crypto BriefingArticle ·
Anthropic’s Claude Fable 5.2 finishes a 23-year-old black hole calculation Anthropic's AI breakthrough in black hole physics highlights AI's potential to solve longstanding scientific problems, impacting future research methodologies. The post Anthropic’s Claude Fable 5.2 finishes a 23-year-old black hole calculation appeared first on Crypto Briefing .
Open source - TE
TechmemeArticle ·
Anthropic says during prerelease testing Mythos 5.2 and Fable 5.2 formalized the proof of Fermat's Last Theorem and solved two open black hole physics problems (Jay Peters/The Verge) Jay Peters / The Verge : Anthropic says during prerelease testing Mythos 5.2 and Fable 5.2 formalized the proof of Fermat's Last Theorem and solved two open black hole physics problems — Claude Fable 5.2 is designed to take on big technical challenges, and it's available today.
Open source - WS
Wall St Engine@wallstenginePost on X ·
ANTHROPIC JUST LAUNCHED CLAUDE FABLE 5.2 Kalshi puts the odds that Anthropic officially announces an IPO this month at 80%. Here's what you need to know about the new model: - Fable 5.2 beats Opus 5.5 in almost everything - Tops GPT-6 Astra and Gemini 4 Carbon on most tests - Up to 30% faster and 20% cheaper than Fable 5.1 - - Matches Opus 5.5 Max at coding for half the cost - 1K agents formalized Fermat's Last Theorem in 30hrs - Mythos 5.2 correctly modeled 28 of 34 gene therapy capsids
Open source - TI
The Indian Express@IndianExpressPost on X ·
Ahead of a potentially historic IPO, Anthropic has released two of its most advanced AI models. This is the first release since CEO Dario Amodei called for a slowdown of AI development. https://t.co/PbTOy1xdph
Open source