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On October 23, The Wall Street Journal reported that OpenAI has fired three security researchers. Internal security personnel discovered that they had engaged in disappearing message chats via Signal with external AI security researchers, raising suspicions that sensitive information related to OpenAI's internal model design was involved. This investigation reportedly began following a September article about OpenAI's latest model, Astra. The article mentioned that Astra employs a new design that enhances model capabilities while reducing the observable reasoning processes for humans. OpenAI viewed the related report as a potential leak of internal model design and initiated a probe into the source of the information. The report also highlighted that this controversy touches on the issue of AI model 'monitorability.' Some security researchers are concerned that if future models can perform tasks without leaving complete traces of their reasoning, it may become more challenging for researchers to determine the reasons behind an AI agent's decisions, as they would only be able to observe the outcomes of its actions. OpenAI investigators have also identified Ryan Greenblatt, who assisted METR in analyzing the logs of the July Hugging Face hacking incident, as one of the suspected leakers, a claim Greenblatt denies.

According to an announcement from Forma's official X account, the Forma mainnet will cease operations at block height 34,567,890, expected around November 5. Users will have approximately two weeks to withdraw on-chain funds. After the chain stops, the team will take a snapshot of the on-chain status and migrate the remaining TIA to Eden. Both chains are EVM chains, allowing users to use the same wallet address to withdraw funds from Eden once the migration is complete. Modularium will be migrated to Ethereum, along with the related NFTs; holders will need to claim them through the re-launched Modularium website, as NFTs will not be airdropped automatically. The official announcement states that the migration may take several days after the chain halts, and further announcements will be made upon completion of the migration, with more details and operational instructions to be released in the coming weeks.

The Browser Company announced that it will completely cease operations of the Arc browser for macOS and Windows on December 22, 2026, and has closed new user registrations. Starting from November 23, mobile AI features, login, and tab synchronization will gradually be disabled, as the team shifts its focus entirely to the AI browser Dia. Arc was launched in 2022, initially available only to Mac users by invitation, and became fully open in 2023, with plans to roll out to Windows and mobile platforms in 2024. The product design included a vertical tab bar, independent workspaces, automatic tab organization, split-screen browsing, and the ability for users to directly modify webpage appearances. The company previously disclosed that Arc had over one million weekly active users. Founder Josh Miller stated in 2025 that Arc was too complex for average users, with a high learning curve, as only 5.52% of daily active users frequently utilized multiple workspaces. The team ceased development of new features that year and shifted focus to Dia. In October of the same year, the parent company was acquired by Atlassian for approximately $610 million. The reason for the shutdown is that the security of browsers in the AI era requires ongoing investment, and engineering and security resources must be concentrated on Dia.