Performance Surpasses Opus! Anthropic Leaked Document Reveals: The New Generation Super Model Claude Mythos Is Already in Testing

marsbitPublished on 2026-03-27Last updated on 2026-03-27

Abstract

According to leaked internal documents from Anthropic, the company's highly anticipated next-generation AI model, Claude Mythos, is currently in a secret testing phase. The documents reveal a new model tier named "Capybara," which represents a major technological leap, featuring a larger scale and superior intelligence that surpasses the flagship Claude Opus model. The leak also highlights significant concerns within Anthropic regarding unprecedented cybersecurity risks associated with Claude Mythos, prompting a cautious release strategy to balance advanced capabilities with safety. This development is expected to significantly raise the benchmark for large language models, intensifying competition in the AI industry and pushing the evolution of models toward deeper logical reasoning and complex task handling. The official release date for Claude Mythos remains unannounced.

The competition in computing power and intelligence in the field of artificial intelligence is entering a new phase as new models from top-tier labs are exposed.

On March 27, according to media reports citing internal leaked documents from Anthropic, the highly anticipated new generation super model Claude Mythos has now entered a secret testing phase. This leaked blog draft not only showcases the model's powerful performance but also sparks a fresh round of discussion on AI safety.

Defining a New Tier: The Leap from "Opus" to "Capybara"

The leaked document discloses a completely new model tier designation—Capybara. This tier represents the most groundbreaking technological leap in Anthropic's history:

Intelligence Ceiling: The document clearly states that Capybara corresponds to a new, larger-scale tier with a higher level of intelligence.

Surpassing the Flagship: Its comprehensive capabilities have fully surpassed those of the previously industry-benchmark Claude Opus model.

Naming Association: Internal information indicates that Capybara and Mythos most likely refer to different expressions of the same underlying architecture.

The Two Sides of the Coin: Unprecedented Cybersecurity Risks

Alongside the soaring intelligence level, Anthropic internally has also expressed high alert regarding the potential demonstrated by Claude Mythos.

Risk Assessment: The leaked document shows that the company believes this model presents unprecedented cybersecurity risks.

Safety Countermeasures: This risk warning also explains why Anthropic has always maintained a cautious release节奏, attempting to find a stricter balance between pursuing "the most powerful intelligence" and "human safety".

Industry Shockwaves: The Large Model Hierarchy Faces a Reshuffle

As OpenAI's most formidable competitor, Anthropic's move with this new model undoubtedly drops a bombshell on the entire industry:

Competition Escalation: The emergence of Claude Mythos means the baseline for large model capabilities will once again be significantly raised.

Technological Evolution: Judging from the currently disclosed information, the next generation of models is evolving from mere conversational ability towards deeper logical reasoning and complex task handling.

Conclusion: Searching for the "Mythical" Boundaries of AI

Although the official release date for Claude Mythos has not yet been set, the outline of "stronger intelligence" is already clearly visible. As AI's intelligence level begins to surpass the cognitive boundaries of humanity's past, how to harness this power will become a common challenge faced by Anthropic and even global tech giants.

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