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Anthropic releases Claude Fable 5.2 and Claude Mythos 5.2 models

The models are pitched at harder coding, reasoning, and vision work, which matters to developers and businesses choosing which models to build on.

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This brief comes from Tech Twitter’s edited headlines. The posts below are the sources grouped with the story; statements in them belong to their authors.

ClaudeLead source
Introducing Claude Fable 5.2 and Claude Mythos 5.2, designed to tackle the most daunting technical challenges. They’re capable collaborators on ambitious projects in many fields, and show improvements in areas like coding, reasoning, and vision.
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🚨 BREAKING: Anthropic has released Claude Fable 5.2 I tested the new model and had it build a nationwide water safety map for me. My question was which big American cities are best set up for water in the next few decades. The #1 answer, according to the model it built out, is... Indianapolis, Indiana. From one prompt, it scoured federal data across the EPA, USGS, NOAA, FEMA, and the Census Bureau (more than 5 GB, including 15.5 million EPA violation records and 2 million PFAS test results). Then I had a dozen other AI agents check its work (which found some errors, like Alaska’s North Slope getting a high score because its temperature data was missing). The final map rates 3,100 counties and more than 900 city areas on 17 measures. On an aggregate score between water supply, climate…
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Claude Fable 5.2 from @AnthropicAI on ARC-AGI (Verified): - ARC-AGI-3: 97.7%, $18.6K (provider adapter harness), 81.2%, $21.9K (standard harness) - ARC-AGI-2: 93.8%, $0.98/task - ARC-AGI-1: 98.5%, $0.36/task Fable 5.2 sets a new high score on ARC-AGI-3 in the standard harness.
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SITUATION DETECTED: Fable 5.2 has solved two open problems in theoretical physics. Both concern black holes, and the effort to unite the two linchpin theories of modern physics, relativity, and quantum mechanics.
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During pre-release testing, Claude Fable 5.2 and Claude Mythos 5.2 worked on ambitious projects in many different fields. Here are a few. From a one-paragraph prompt, Fable 5.2 designed three working electronic devices, including this home voice assistant hub.
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How the headline evolved

  1. Anthropic releases Claude Fable 5.2 and Claude Mythos 5.2 models

  2. Anthropic releases Claude Fable 5.2 and Claude Mythos 5.2 models

  3. Anthropic releases Claude Fable 5.2 and Claude Mythos 5.2 models

  4. Anthropic releases Claude Fable 5.2 and Claude Mythos 5.2 models

  5. Anthropic releases Claude Fable 5.2 and Claude Mythos 5.2 models

  6. Anthropic releases Claude Fable 5.2 and Claude Mythos 5.2 models

  7. Anthropic releases new Claude Fable and Mythos models for hard problems

  8. Anthropic releases Claude Fable 5.2 and Claude Mythos 5.2 models

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