mythos

Anthropic released Claude Fable 5.2 and the restricted version Mythos 5.2 on Monday, stating that the new model can transform a small number of instructions into runnable software, design physical objects, and address research questions that previously required a professional team. The official announcement claims that its output speed has improved by up to 30% compared to the previous generation, with Fable 5.2 scoring 49.1% in the internal FrontierCode 2 evaluation, higher than Fable 5.1's 32.4%. Both share the same underlying model, with Fable having stricter protections against dangerous biological and cybersecurity requests, while Mythos is only open to certified institutions in relevant fields.In terms of pricing, the standard API price is $8 per million input tokens and $40 per million output tokens, lower than the previous generation's $10 and $50; an optional fast mode can increase output speed by up to 2.5 times, but the rates double to $16 and $80. In comparison, Kimi 3.1 Pro is priced at $2 and $10, while the latest DeepSeek model is $0.6 and $1.98 during off-peak hours.AI blogger Matthew Berman's tests show that Fable 5.2 can generate playable games and a browser version of Excel. One level styled after "Gears of War" took 43 hours and 48 minutes to complete, consuming 8.63 billion tokens, with an estimated cost of $14,710 based on developer pay-per-use estimates; the Excel clone is estimated at about $11,700, and a "Fall Guys" style game ran for 71 hours, consuming over 9 billion tokens, approximately $13,000. Anthropic provides one week of Fable access for Pro users and standard Team seats, capped at half of the weekly quota, with promotional access for Pro users ending on November 16.

On November 1, 2026, multiple users posted on X stating that OpenAI's Codex usage data included a model label named GPT-6.2 Astra, while the model selector still displayed GPT-6 Astra. A usage chart covering October 26 to November 1 showed that gpt-6-astra accounted for 80%, and gpt-6.2-astra accounted for 19.8%. Another account posted a suspected JSON snippet of an API response, with the response.model field being gpt-6.2-astra. According to Quantum Bit, GPT-6.2 Astra has been undergoing a limited gray testing among some users, with access primarily restricted to Pro plan users at $500 per month. Some users reported that about 20% of requests were routed to 6.2, while others claimed all requests pointed to 6.2.On the same day, an account posted a screenshot claiming that hidden code on the Anthropic official website's Mythos page included Claude Mythos 5.5. The visible page displayed Claude Mythos 5.1, while the hidden header and logo alt text indicated 5.5. According to Quantum Bit, this text briefly appeared in the front-end code of the official website and was removed a few hours later. Anthropic has not confirmed this, and currently, apart from the screenshot, there are no archived copies to verify this change.Additionally, there were previous reports that Fable 5.5 had appeared in the Microsoft Azure and MLflow directories, with a context window of 1 million tokens and an output limit of 128K tokens. Verification showed that on October 13, 2026, a bot added the entry azure_ai/claude-fable-5-5 to the price list of the open-source tool LiteLLM, which was deleted the next day, with the deletion note stating "Azure did not list this model." These parameters are identical to those of Fable 5.1. As of now, neither OpenAI nor Anthropic has officially released the aforementioned models.

Anthropic has provided access to its Mythos artificial intelligence model to the EU cybersecurity agency ENISA, more than three months after it first indicated it would grant access to the EU.European Commission spokesperson Thomas Regnier stated in an email: After constructive engagement with Anthropic, we can confirm that the EU cybersecurity agency ENISA has gained access to Mythos 5, which is currently under testing.

According to Catcher Predict monitoring, in the event of "the next Mythos level vehicle release party" on the prediction market Polymarket, the "is" option in the sub-market "September 3" experienced a dramatic fluctuation in winning probability, soaring from 52.5% an hour ago to the current 68% (a fluctuation of 15.5%). Please note the impact of related breaking news.

According to the SemiAnalysis podcast, Anthropic has set extremely strict classifiers for the public version of its flagship model Mythos, called Fable, due to regulatory pressure. Users attempting specific actions will be immediately downgraded to the Opus model, and conversations cannot be reverted. Dylan Patel, founder of SemiAnalysis, stated that the classifier restrictions are "too harsh," and even internal employees cannot complete routine tasks with it.The podcast mentioned that the Mythos model completed training as early as February, but Anthropic did not release it under the name Fable until May. Jordan stated in the discussion that, to his knowledge, Mythos 2 has completed training but has not been released, and the internal R&D team is believed to still be iterating. Analysts believe that Anthropic's previous long-standing calls for regulation have now resulted in regulatory measures that limit the release pace of its own models. Similarly, OpenAI is also delaying the public release of its next-generation models, but internal training is still progressing, and the capability gap between internal models and public models may continue to widen.

Payward (the parent company of Kraken) stated that in the coming weeks, it will use Claude Mythos 5 to scan for vulnerabilities in all Payward environments, and the findings will be directly incorporated into its existing security program.

According to Reuters, the U.S. Department of Commerce has officially lifted export controls on two AI models from Anthropic, Claude Fable 5 and Mythos 5, less than three weeks after the restrictions were imposed. Anthropic stated that access to the aforementioned models will be restored the following day.Previously, on June 12, Anthropic was forced to urgently take down the two models due to national security risks; on June 27, the U.S. government partially lifted the ban, allowing Mythos 5 to be accessible to certain "trusted" U.S. institutions. U.S. Secretary of Commerce Howard Lutnick stated that the government has closely collaborated with Anthropic over the past two weeks to complete the review and approval of Fable 5, ensuring it aligns with the overall stance of the U.S. government and strengthens the country's leadership position in the AI field.

According to the Associated Press, Anthropic's Mythos model has discovered vulnerabilities in the U.S. government's classified systems.

According to Andrew Curran, the next-generation Mythos model from Anthropic, which has stronger capabilities (named either Mythos 5.1 or Mythos 6), has completed training. It is currently uncertain whether this model will be publicly released or kept for internal use only to accelerate the development of subsequent technologies.Analysis indicates that although some cutting-edge models like Fable 5 or Mythos 5 face restrictions or scrutiny regarding public release, this has not slowed down the research and development pace of top AI laboratories. In the face of fierce competition from open-source models represented by GLM-5.2, leading AI companies still need to continuously invest in and train more powerful systems to maintain their commercial and technological leadership.

Zcash founder Zooko Wilcox posted to express gratitude to Anthropic for helping to protect Zcash users.At the request of Shielded Labs, they conducted a security audit of Zcash using Mythos, and no other serious vulnerabilities were found in the Zcash protocol. Shielded Labs and other teams are continuing to advance security reinforcement work, and updates will be released later.

According to an official statement from Anthropic, on June 11 local time, the U.S. government issued an export control directive citing national security, requiring the suspension of access to Fable 5 and Mythos 5 for all foreign nationals. Anthropic was forced to shut down the aforementioned two models for all users.The government believes it has discovered a "jailbreak" method to bypass the protective mechanisms of Fable 5, but Anthropic, after review, pointed out that the related vulnerability is relatively minor and that similar capabilities exist in other publicly available models such as OpenAI GPT-5.5, which does not constitute an exclusive risk to Mythos.Anthropic stated that it will comply with the government directive but clearly opposes taking down commercial models that have been deployed to hundreds of millions of users based on the discovery of a single narrow-range jailbreak. They warned that if this standard is widely applied in the industry, it would effectively block all new deployments of cutting-edge models. The company is currently actively communicating with the government to restore access as soon as possible.

The "Anthropic" plan allows the EU's cybersecurity agency to use the powerful artificial intelligence tool "Mythos," which can discover and exploit vulnerabilities in computer systems.According to informed sources, Anthropic will allow the European Cybersecurity Agency to join the "Glass Wings" project. This project aims to let key institutions test the capabilities of "Mythos" before widespread deployment. A spokesperson for the European Commission stated that negotiations with Anthropic are progressing but declined to comment further.

According to Axios, the White House is formulating guidelines that allow federal agencies to bypass the previous supply chain risk designation for Anthropic and introduce its latest model, Mythos. Sources say that the White House's move aims to gracefully bring Anthropic back. Earlier this month, White House Chief of Staff Susie Wiles and Treasury Secretary Bessent met with Anthropic CEO Dario Amodei.Previously, the Pentagon had listed Anthropic as a supply chain risk due to Anthropic's refusal to sign an agreement allowing the Pentagon to use its model Claude for all lawful purposes, insisting on prohibiting its use for large-scale domestic surveillance or the development of fully autonomous weapons. Currently, multiple federal agencies are vying for access to Mythos, which demonstrates powerful capabilities for automated cyber attacks while also serving as a defensive tool. The White House stated that any policy announcement will come directly from the president, and anything else is speculation.

According to Decrypt, Mozilla recently revealed that Anthropic's latest AI model, Claude Mythos, identified 271 security vulnerabilities during internal testing of the Firefox browser, and the related vulnerabilities have been fixed this week.In comparison, a previous version of the Anthropic model only found 22 security-sensitive vulnerabilities. Mozilla stated that all discovered vulnerabilities were within the scope of top human researchers' findings. Claude Mythos was officially released in March 2026 and is Anthropic's most powerful model in the fields of reasoning, coding, and cybersecurity, currently available for use by vetted partners such as Amazon, Apple, and Microsoft through the "Project Glasswing" initiative.

According to Cointelegraph, the Monetary Authority of Singapore (MAS) has urged banks to strengthen their cybersecurity defenses due to heightened regulatory concerns arising from the spread of the Mythos AI model under Anthropic in the Asia region.

According to market news, Anthropic plans to provide access to "Mythos" to UK banks within the next week.

Coinbase and Binance are seeking access to the Anthropic AI model Mythos to enhance their ability to respond to AI-driven cyber threats.Reports indicate that Coinbase has begun discussions with Anthropic, with its Chief Security Officer Philip Martin stating that the model is expected to accelerate digital threat identification and defense capabilities. Meanwhile, Binance and Fireblocks are also evaluating the potential applications of the model in the field of cybersecurity.

According to CoinDesk, Anthropic has recently been revealed to be testing a new AI model called "Mythos," which is described as "bringing unprecedented cybersecurity risks." This has a direct impact on the cryptocurrency industry, as the enhancement of AI capabilities will further amplify its role in smart contract auditing, vulnerability discovery, and attack automation, potentially intensifying the offensive and defensive dynamics in DeFi.Recent events, including Ripple's launch of AI security upgrades, the Ethereum Foundation's layout for quantum-resistant security, and the Resolv stablecoin losing its peg due to contract vulnerabilities, all highlight the importance of security issues.It is reported that the Mythos model is currently only open for testing to early access customers, as it is costly and sensitive in capability, and is not yet ready for a full release.

According to a report by Fortune magazine, documents leaked from Anthropic show that its next-generation super robot "Claude Mythos" is currently being tested, and the company believes that this robot "poses an unprecedented cybersecurity risk." Musk stated, "This is deeply concerning."