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OpenAI GPT-5.4-Cyber is More Open Than Claude Mythos

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OpenAI’s GPT-5.4-Cyber further underscores the need for the cybersecurity community to rethink its strategy and bolster its defenses against bad actors, even as the model responds to rival Anthropic’s controversial Mythos platform.

OpenAI rolled out GPT-5.4-Cyber on April 14, a few days after the Mythos limited release. The model is an expansion of OpenAI’s Trusted Access for Cyber (TAC) program, which provides cybersecurity professionals access to advanced AI models for defense security tasks. It is a fine-tuned version of GPT-5.4 that enables capabilities such as binary reverse engineering that cyber experts can use to analyze compiled software for potential malware and vulnerabilities. Cyber is only available to vetted security vendors, organizations, and researchers, according to OpenAI.

The model is notably a response to Anthropic’s release of Claude Mythos, which the Claude maker said is too powerful to release widely and is accessible only to select large companies. It is also evidence that cybersecurity experts need to be vigilant in finding ways to ensure they are prepared to defend against attacks by malicious users. 

Related:The Real AI Shift Isn’t New Models. It’s Control.

“The fact that they’re potentially opening it more broadly is going to be more helpful for the community because more people are going to have a chance to look at it,” said Lionel Litty, CISO at Menlo Security. 

A Chance to Prepare

GPT-5.4-Cyber’s release through TAC could provide cybersecurity experts and researchers with further insights into how to prepare for cyberattacks, because, unlike Mythos, more people have access to it, Litty said. The AI-powered security platform protects organizations against cyber threats, including malware, ransomware, and phishing.

However, those with bad intent could also take advantage of that opportunity.

“There’s more chances of it being misused,” Litty said. He added that even with OpenAI’s security model being more open, “it remains to be seen where things fall in terms of how useful it’s going to be for us that are on the defensive side versus attackers.”

Despite uncertainty about who will use the capabilities, the message is clear: it is time for cybersecurity experts to prepare for the misuse of this iteration of generative AI technology.

“Most people knew this was coming, but it has become more urgent,” Litty said. 

Enterprises need a clear understanding and visibility into what is happening in their organizations, and to assess whether components such as IT infrastructure need updating due to the organization’s new ability to rapidly discover new vulnerabilities, he added. On the other hand, bad actors’ ability to exploit security holes is accelerating, underscoring the need for enterprises to remediate security issues.

Related:Anthropic Releases Good but not Great Claude Opus 4.7

“This is where having a pretty good understanding of what you have in place, what needs to be secured and how a good process is in place, taking advantage of AI yourself is going to be important,” Litty said.

Beyond automation, enterprises need to be ready for software to be compromised and prepared with effective countermeasures, Litty added. 

“You want to make sure that you can limit the damage,” he said. “Make sure you have a containment strategy in place.”

Rethinking the Strategy

Not only is the release of Cyber and Mythos a chance for cybersecurity experts to prepare for malicious attacks, but it might also signal that it is time to reconsider their overall defense strategy.

“They have to rethink how to do more autonomous reliability management or even more zero-cost oriented,” said Gartner analyst Arun Chandrasekaran. Enterprises should use AI to bolster their cybersecurity measures.

“The usage of AI, hopefully in cybersecurity, will significantly increase, with the improvements in capabilities that we’re seeing with these AI models,” Chandrasekaran said.

Related:Stellantis Ramps Up AI Strategy With Microsoft Deal

 

 

ETH Accumulation Wallet Balances Rise By 33%: Will ETH Price Follow?

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Ether’s (ETH) rally to $2,400 is nearly 38% above its swing low at $1,750, but is ETH’s price move simply a momentum trade, or do longer-term data points suggest a paradigm shift at play?

ETH accumulation addresses absorb 6.5 million Ether

Ether’s recent rally was preceded by an 89% surge in daily active addresses (DAA), which jumped to 730,278 from 384,763 on April 5.

The increase in Ethereum’s active addresses indicates increased user interaction with the network, which is generally a positive.

The chart below shows that activity increased significantly as Ether price rose to $2,300. 

Ethereum daily active addresses. Source: CryptoQuant

Similar activity has been consistently observed near macro bottoms since 2022, preceding significant ETH price rallies.

Daily inflows into accumulation addresses have also increased since mid-2025, reaching an all-time high of 1.14 million ETH in November 2025. The inflows have continued to climb in 2026, averaging 200,000 ETH per day, with a spike to over 358,000 on Thursday.

Related: ETH/BTC ratio hits 10-week high as Ether outpaces Bitcoin: Are new price highs next?

The amount of ETH held in accumulation wallets, or holders with no history of selling, has increased by 6.5 million to 26.16 million from 19.64 million on Jan. 1, representing a 33% increase.

The ETH supply held in accumulation addresses is a key indicator for traders and market participants, as it reflects overall confidence in Ether’s long-term outlook.

ETH inflows into and balance in accumulation addresses. Source: CryptoQuant

The total value of ETH staked further reinforces this outlook. The metric now stands at 39.2 million ETH, signaling growing investor confidence.

Staked ETH supply. Source: Dune

As Cointelegraph reported, Ether supply held on exchanges has fallen to multi-year lows, further tightening liquidity on order books. 

Ether cup-and-handle chart breakout targets $3,150

The ETH/USD pair may resume its prevailing bullish trend after breaking out of a cup-and-handle (C&H) chart pattern, as shown in the chart below. A 12-hour candlestick close above the cup’s neckline at $2,400 may signal the start of a stronger uptrend.

The target is set by adding the cup’s depth to the breakout point, which comes to around $2,960, an approximately 22% increase from the current price.

ETH/USD 12-hour chart. Source: Cointelegraph/TradingView

The relative strength index has risen to 68, suggesting that ETH bulls are back in control. 

Trader TheSkayeth spotted a larger C&H pattern forming over the last two months on the daily time frame, saying ETH was “setting up for a massive move.”

“If the cup and handle pattern continues, I think we get to the golden zone next.”

ETH/USD daily chart. Source: X/TheSkayeth

The measured target of this larger formation is $3,150, which is 30% above the current level.

Applying this framework, ETH bulls will need to hold above the $2,350-$2,400 zone to confirm a sustained upward breakout.

As Cointelegraph reported, a close above the $2,400 level would increase the prospects of the ETH/USDT pair rising to $2,800 and later to $3,050.