Claude Fable 5.2
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Headlines · 14
- Reddit user reports Claude Fable 5.2 building a Stonehenge WebGL scene
A Reddit user reported that Claude Fable 5.2 at high effort created an interactive Stonehenge scene from one prompt. The claimed result is a single browser-based HTML file using three.js, with modeled stones, moving grass, real-time shadows, a solstice-tracking sun, 144 visitors, and an “as built” view. The user reported a total cost of $21 and 20.3 million tokens, but the supplied report provides no independent verification.
r/ClaudeAI · 🔥 5 - Anthropic launches Claude Fable 5.2 and Mythos 5.2
TestingCatalog reports that Anthropic launched Claude Fable 5.2 and Claude Mythos 5.2, two models built on the same underlying system for demanding technical work. Fable includes cyber and biology safeguards and is available through Claude platforms, AWS, Google Cloud and Microsoft Azure, while vetted cybersecurity and life-sciences organizations can apply for Mythos through verification programs. Anthropic says the models improve coding, reasoning and vision, with standard pricing set at $8 per million input tokens and $40 per million output tokens.
IT之家 AI · 🔥 39 - Claude Fable 5.2 Is Now Available on Google Cloud
Google AI on DEV reports that Claude Fable 5.2 is now available on Google Cloud. The vendor promotes the model for agentic coding across multiple repositories and monorepos, long-running unattended workflows that coordinate subagents, and scientific or data pipelines involving physics computations, formal proofs, and data analysis. The supplied report does not provide independent validation for these capability claims.
Google AI on DEV · 🔥 9 - Reddit user tests Fable 5.2 with a cat animation
A Reddit user in r/ClaudeAI said they tested Fable 5.2 (extra) by asking for a cat leaping through eras while retaining its own art style. They judged the result weaker than a previously circulated Superman animation made with an alleged early-access “fable 5.5,” while leaving open whether prompt wording or visual performance was responsible. The account is a single-user test and does not provide enough detail to verify the comparison.
r/ClaudeAI · 🔥 4 - Early-access Reddit user reports faster, cheaper Fable 5.2
A Reddit user who received early access to Fable 5.2 reported faster output, fewer blocks, and lower API pricing, but skipped formal benchmarks and provided only personal observations. The reviewer cited Anthropic's claims that output is up to 30% faster than Fable 5.1, medium-effort hard tasks use fewer tokens, and a fast mode can reach 2.5x; their perceived speed broadly matched the 30% claim. They also said the model priced at $8 per million input tokens and $40 per million output tokens, and successfully diagnosed a broken webpage from a screenshot.
r/ClaudeAI · 🔥 4 - Claude Fable 5.2 Tops Artificial Analysis Index With a Score of 65
Artificial Analysis, as reported by Hacker News, gave Claude Fable 5.2 a score of 65 on version 5.0.1 of its Intelligence Index, described as the highest score so far. The composite covers nine evaluations spanning knowledge work, coding, science and general knowledge. The report also lists a 1M-token context window, text and image inputs, and proprietary weights for the model.
Hacker News 首页（100+ 分） · 🔥 21 - V2EX thread reports Fable release and a 65-point ranking
A V2EX thread said that Fable had formally launched and had scored 65 while remaining atop a ranking. The poster praised its model performance, but the report did not identify the benchmark, scoring method, publisher, or provide an official release announcement.
V2EX · Claude 节点 · 🔥 4 - Claude Code v2.1.321 adds Fable 5.2 and security fixes
Claude Code Releases says v2.1.321 adds Claude Fable 5.2 as the default Fable model, with a 1M-token context, $8/$40 per million input/output tokens, and $0.20 per million cache-read tokens. The update also adds a shared --settings option for claude remote-control sessions and fixes security and permission issues involving MCP OAuth redirects, sandbox execution, Bash checks, cp or mv, and protected files.
Claude Code Releases · 🔥 9 - Claude Fable 5.2 review finds strong capabilities but persistent gaps
One Useful Thing author Ethan Mollick used Claude Fable 5.2 extensively before its public launch and described it as “very impressive,” following the already excellent Claude Opus 5.5. In tests involving code, video creation, research and other difficult intellectual tasks, he called the model “almost” AGI, or “Jagged AGI.” He also said it still falls behind human capability in important areas and does not reliably recognize when its own work is inadequate, often requiring human oversight to correct problems such as excessive length or repetition.
One Useful Thing · 🔥 9 - Anthropic Unveils New Fable and Mythos Models Before Planned IPO
Anthropic unveiled new versions of its Mythos and Fable AI models ahead of its planned Wall Street debut. The release was described as an effort to strengthen the company’s position as a leader in AI development.
Bloomberg Technology · 🔥 9 - Anthropic Releases New Frontier Models Amid IPO Preparations
Anthropic has released its first frontier models since Amodei’s call for a slowdown. The launch coincided with preparations for what is widely expected to be a blockbuster IPO. The supplied report does not provide model names or technical details.
CNBC Technology · 🔥 9 - Anthropic Releases Claude Fable 5.2 and Mythos 5.2
Anthropic released Claude Fable 5.2 and Claude Mythos 5.2, describing them as best suited to ambitious, open-ended technical work. The Verge reported that Fable 5.2 was available immediately. Anthropic set pricing at $8 per million input tokens and $40 per million output tokens. During prerelease testing, Anthropic says the models formalized a proof of Fermat's Last Theorem and solved two open black-hole physics problems.
AWS Machine Learning Blog · 🔥 75 - Claude playbook guides model selection and multi-model workflows
The Claude Developer Blog published a playbook by Addy Osmani on choosing among Claude Fable 5.2, Opus 5.5, Sonnet 5.5, and Haiku 5.5. It covers task-based selection, effort levels, token costs, context and cache considerations, and combining models, with recommendations ranging from Haiku for high-volume classification to Fable for difficult technical projects.
Claude Developer Blog · 🔥 7 - 1,000 Claude Fable 5.2 agents reproduce a formal Fermat proof
Anthropic reports that 1,000 agents running an early version of Claude Fable 5.2 reproduced a Lean-checked formalization of Fermat’s Last Theorem without Prove2Me or researcher steering. The team took 28.7 hours, used one-third as many output tokens, and produced a proof one-seventh the length of the earlier formalization. The toy experiment operated in an isolated sandbox with command screening and offline monitoring, so its results do not establish performance outside that controlled setup.
Claude Developer Blog · 🔥 20
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