Claude news

Anthropic released the AI models "Claude Fable 5.2" and "Claude Mythos 5.2," designed for the most difficult technical challenges, in an official blog post dated Nov. 9. The two share the same underlying model; Fable, which has strong safeguards for cybersecurity and biology, is available to users on the Pro, Max, Ultra, Team and Enterprise plans and through the API. Mythos is for organizations that pass a review. API pricing is $8 per million input tokens and $40 per million output tokens, down from $10 input and $50 output for 5.1. Anthropic said the model scored 49.1% on FrontierCode 2.0, an evaluation of development work (with reasoning at Xhigh), above Claude Opus 5.5's 45.5%. In an evaluation by third party Artificial Analysis (AA), it ranked first on the overall index with 65, but its cost per task at the deepest reasoning setting was $26.5, about 2.6 times Opus 5.5's $10.0.

Anthropic said on Nov. 10 it has begun its roadshow presenting to institutional investors ahead of a Nasdaq listing. It is offering 825 million Class A shares at an expected price of $70 to $78 per share. According to an amended registration statement filed the same day, seven companies including Google and NVIDIA will buy a total of $26 billion of non-voting shares at the offering price immediately after the listing. The company's net proceeds are expected to be about $84.6 billion at $74, the midpoint of the price range. The registration statement has not yet become effective, and no listing date has been given.

Anthropic on Nov. 10 (Nov. 11 Japan time) launched the shared board "Claude Whiteboards" and the spreadsheet "Claude Sheets" in beta in its AI assistant "Claude," and made the data analysis feature "Claude Data" generally available. All 3 are available on all paid plans, on the web, desktop and mobile. Sheets currently has basic features, and Anthropic advises exporting when the full functionality of Excel is needed. The company also expanded "interactive connectors," which open apps from other companies such as Adobe, Atlassian and Box beside the chat or in full screen for hands-on use, and broadened support for "MCP Apps," an extension for developers.

Anthropic on Nov. 10 (Nov. 11 Japan time) announced that it has given users of Claude's paid "Pro," "Max," "Ultra" and "Team" plans a one-time reset that restores all models and all usage limits. It expires at 2 p.m. Dec. 10 (7 a.m. Dec. 11 Japan time). As reasons, the company cited fixing a few small issues that consumed more of the limits than intended, and the fact that the Fable reset handed out on Nov. 9 did not help some users much. It did not say what the fixed issues were or how widely they had an effect.

Google DeepMind on Nov. 10 (Nov. 11 Japan time) released "MKA," a new benchmark developed with U.S.-based Artificial Analysis that tests AI agents on reading visually complex files such as drawings and medical images and producing deliverables. On 200 tasks created by experts in 10 industries, Anthropic's Claude Fable 5.2 ranked first (57%) and Google's Gemini 4 Carbon second (54%). By Artificial Analysis' calculation, the cost per task was $31.97 for Fable versus $6.29 for Carbon, a gap the company describes as more than 5 times. Google, by its own calculation, claims one-sixth. The differences among the top three are not statistically distinguishable.

Anthropic announced on its official X account on Nov. 6 (Nov. 7 Japan time) that it had made it easier to get a repository running in cloud sessions of its AI coding tool "Claude Code." Claude determines the dependencies, network access and API keys needed, and saves the environment for next time. It is available on Pro, Max and Ultra, and the company says API keys are stored securely and Claude does not see them. Official documentation describes a mechanism that attaches keys to traffic outside the virtual machine, but there are conditions, such as keys that cannot be attached remaining in environment variables. The official demo in the post showed a flow in which the environment is created after the user approves and keys are entered in a dedicated form. Official documentation as of Nov. 7 did not appear to describe this procedure.

Podcast host Dwarkesh Patel on Nov. 5 (Nov. 6 Japan time) released "Clocktower Bench," a benchmark that pits AI models against one another in "Blood on the Clocktower," a game in the werewolf genre. He said API costs came to about $20,000. In 386 games among 11 models released in 2026, OpenAI's GPT-6 Astra ranked first with 1,859 points, while Anthropic's best was Claude Fable 5.1 with 1,595. Most of OpenAI's advantage came from the side that detects the villains, he said. Only the 2 companies' models were tested, and no third-party reproduction could be confirmed.

Anthropic announced on Nov. 5 (Nov. 6 Japan time) that it will gradually roll out "Personal Finance" as a beta in the U.S., a feature that lets users connect bank and other accounts to the AI assistant "Claude" and ask questions about their money. It is available on 3 paid plans, Pro, Max and Ultra, and connections use Plaid. Access is read-only, and transfers and investing are not possible. There are no ads, and conversations in the dedicated view are not used for training, the company said. ChatGPT's personal finance feature has expanded to the free tier and also shows investment holdings. Whether the feature belongs to the same line as the leaked "Claude Money" cannot be confirmed from Anthropic's materials.

METR, a U.S. AI evaluation group, on Nov. 5 (Nov. 6 Japan time) released a report on an independent assessment using Anthropic's internal data. It estimated that the rise in AECI, a metric combining internal and external benchmarks, accelerated from 15 points a year to 29 points a year from October 2025 onward, 1.9 times the earlier pace. Depending on calculation assumptions, however, the figure swings from 1.1 to 2.9 times, and including other companies' models it is 1.4 times. The figure attributing about 80% of the acceleration as of October 2026 to AI is METR's subjective judgment. Anthropic redacted most of the evidence METR considered most useful.

Austin Lau, who helped build Anthropic's "growth" function, which works to increase users and revenue, said on X on Nov. 4 (Nov. 5 Japan time) that he had recently joined OpenAI. The post came about an hour and a half after Cat Wu announced the same day that she had joined OpenAI. The post did not give his title or responsibilities at OpenAI, and his start date and any connection to Wu's move are unconfirmed. Anthropic is preparing for an IPO expected in the week of Nov. 16, and key members of the Claude Code team have continued to leave.

Anthropic said on Nov. 4 (Nov. 5 Japan time) that it had reduced how much of the usage limit is consumed by helper AIs that run in the background (subagents) in its coding tool "Claude Code." The status line, updated about every 30 seconds, is now written by the small model "Haiku 5.5" from short notes. According to the company, the cost of each update fell by about 99%, and for work that uses these AIs, consumption fell by about 5%, allowing about 6% more prompts within the same limit. In one developer's measurements, status updates under the old method accounted for 16.4% of costs.

Cat Wu, who served as product lead for Anthropic's AI coding tool "Claude Code," said on X on Nov. 4 (Nov. 5 Japan time) that she is joining OpenAI. She will lead product management for "Core Products," which includes ChatGPT and Codex. The announcement came five days after her last day at Anthropic; according to Business Insider, OpenAI confirmed the hire and Anthropic declined to comment. Her formal title, start date and scope of responsibility for Codex are unconfirmed. With Anthropic preparing for an IPO expected in the week of Nov. 16, the former head of one of its flagship products is moving to a rival.

Video generation AI company Runway announced on its official X account on Nov. 4 (Nov. 5 Japan time) that its developer API platform "Runway Dev" can now be used in Anthropic's Claude Code. With the plugin installed, Claude Code reads the models, pricing and remaining credits available on the user's account and builds Runway's video, image and audio generation into apps. The plugin is free, but generation is billed per use by model, with Gen-4.5 at 12 credits ($0.12) per second. The company also announced versions for OpenAI's Codex and Cursor on Nov. 2, turning AI coding tools into a new sales channel.

Addy Osmani, who works on Claude Code at Anthropic, said on X on Nov. 3 (Nov. 4 Japan time) that a rule refusing to recreate specific existing games had been fixed in Claude Code 2.1.317. The rule had also been refusing requests that merely named a game to describe the mechanics wanted, and Claude Code will now build an original game in that genre. When asked for a copy of the original game, it will offer to build something similar instead. He did not address how work licensed by rights holders is handled.

Cat Wu, who served as product lead for Anthropic's AI coding tool "Claude Code," left the company effective Oct. 30. She announced it herself on X on Nov. 3 (Nov. 4 Japan time), and according to Business Insider, Anthropic also confirmed her departure. She did not disclose the reason or her next employer. Two core Claude Code developers also announced their departures in late October, continuing a string of executive departures from the flagship product ahead of an IPO reportedly set for the week of Nov. 16.

Anthropic on Nov. 3 (Nov. 4 Japan time) published a recap of October updates to its programming assistant "Claude Code." It added a feature that automatically summarizes long conversations left idle for about an hour, reducing the usage consumed by rereading the entire conversation when the user returns, as well as a display showing what usage was spent on. It also added a setting that deepens reasoning for a single response when the user writes "ultrathink," though this increases consumption. On Oct. 7, it began giving higher-tier plans, including the $100-a-month Max, $100 to $500 in API credits each month, but the credits cannot be used for Claude Code. OpenAI introduced the same arrangement on Oct. 28.

Anthropic on Nov. 3 announced a beta method for business plans of its chat AI "Claude" that connects employees to work tools such as Notion and Figma simply by logging in to Claude. The existing method requires a system that centrally manages employee logins (an IdP), and the only IdP currently supported is Okta. Under the new method, Claude issues a credential stating that the user is a member of the organization, so it can be used by organizations without an IdP. Claude, however, does not check whether multifactor authentication was used, and users are matched by email address.

Game engine maker Unity on Nov. 3 posted a video on X introducing its official plugin for OpenAI's AI coding tool "Codex." Released in September, the plugin lets Codex choose and use on its own 31 kinds of task procedures (skills) written by Unity engineers. Unity has been extending the same skills to Anthropic's Claude Code, xAI's Grok Build, Google's Antigravity and GitHub Copilot CLI. The plugin does not connect directly to a running Unity Editor, and the version is at the beta stage. Unity will report July-September results on Nov. 5.

China's ByteDance will, from November, keep outside AI such as Anthropic's Claude and OpenAI's Codex from accessing code repositories and internal documents in its internal confidentiality category "L4," TokenPost reported on Nov. 3. Use through AI accounts that employees bought personally will also be banned, with some parts of its own AI unit Seed exempt, the report said. The move is said to be aimed at preventing information leaks. ByteDance has made no official announcement.

Anthropic on Nov. 2 launched "message threads" in public beta in its developer-facing Claude API, temporarily storing conversation history on the server side. From the second request onward, developers need only send the new message and the ID of the previous response, reducing the amount sent and speeding the start of responses. In long Claude Code tasks, the median size per request fell from about 800KB to 1.8KB, the company said. Pricing is unchanged. Stored conversations are deleted 5 minutes after last use, so history also needs to be kept locally.

Anthropic's Claude Code has stopped building programs that recreate specific existing games. A user reported on Oct. 30 that since around Oct. 27, instructions delivered from the server have included a line saying it will not build recreations of specific existing games, even if renamed or described as original. An Anthropic employee confirmed that two sentences were added to the instructions for Opus 5.5. The company said original games, genre games and games based on users' own designs can still be built.

Cursor, the U.S. maker of an AI coding tool, said on Oct. 29 that a tampered version of Anthropic's "Claude Code" extension had been distributed on its extension store for about 11 hours. Up to about 5,000 users installed it. The tampered version collected device information and tried to change settings so that attackers could get in through SSH. Cursor shut down and rebuilt the store and urged users to update to version 2.1.314 or later. Versions distributed through other stores were not affected.

Anthropic on Oct. 29 raised the limit on the amount of data that can be sent in a single request to its developer-facing Claude API from 32MB to 128MB. The change suits requests that include many images, such as long tasks by screen-operating agents and image-heavy PDFs. The per-image limit when sending 21 or more images was also expanded from 2,000 pixels to 3,000 pixels. However, the change applies only to the company's direct API, and the limit remains 20MB to 32MB through cloud services such as Amazon and Google.

Boris Cherny, who leads Claude Code at Anthropic, reported on X on Oct. 28 the results of an investigation into complaints that Claude Code usage limits were being used up faster than expected. He said the team reviewed all the session logs shared by users, found several small bugs that sped up consumption and is rolling out fixes. However, he said no single root cause was found. He did not describe the bugs or mention compensation for the lost usage.

Anthropic announced on Oct. 28 that it has formed deep partnerships with six companies on drug development and is entering drug discovery itself. It acquired Mithril Medicine, a one-employee startup developing a treatment for muscular dystrophy, a rare disease, which used Claude to advance a treatment candidate to mouse trials in less than 18 months. At its partners, it said, results came in antibody design and inspection of manufacturing records. However, most of the work is at the stage before human trials, and the figures are the companies' own reports.

Artificial Analysis, which compares AI models under the same conditions, released version 5 of its overall "Intelligence Index" on Oct. 27. For the first time, private tests make up 60% of the index, and new additions include FrontierCode 2.0, which grades real development work. Anthropic's Claude Opus 5.5 leads with 58 points, followed by OpenAI's GPT-6 Astra with 57. The gap with models whose weights are released widened from 3 points in the previous version to 12.

Google on Oct. 26 released "Gemini API CLI," a command-line tool for calling the Gemini API from AI agents and scripts, as an open-source beta. Agents from other companies, such as Claude Code, Codex and Cursor, can request image, video, speech and music generation, or the reading of PDFs and videos, with a one-line command. It is separate from "Gemini CLI," the interactive coding agent, and is not its successor. Because it is in beta, compatibility may break even in minor version updates.

Cognition, the U.S. maker of the AI programmer "Devin," on Oct. 26 revamped "Devin Security," which handles everything from finding software vulnerabilities to prioritizing and fixing them. Using frontier models such as Anthropic's "Claude Mythos," a model for cyber defense, it searches large codebases even for attack paths that chain multiple flaws together. The company will offer enterprise customers hundreds of millions of dollars' worth of Devin usage credits. It has not, however, given any figures on accuracy or cost.

Anthropic on Oct. 26 made public its registration statement (S-1) for a listing on the Nasdaq market in the United States. The ticker symbol is "ANT." Revenue for January through June 2026 was $16.3 billion, about 14 times the same period a year earlier, and the company posted its first operating profit in the April-June quarter. Meanwhile, a company owned by the seven founders controls 50.1% of ordinary votes through a single share, so investors who buy shares in the listing cannot sway votes. A U.S. newspaper reported that the listing would come in the week of Nov. 16, and the amount raised could exceed $100 billion.

Anthropic announced on Oct. 23 that its programming tool "Claude Code" now supports "Tasks" and "Elicitations," new features of MCP, a standard for connecting external tools to AI. With Tasks, long-running work is handed off to the tool, and Claude continues working without waiting and receives the results when the work is done. With Elicitations, a tool can ask the user for confirmation or input partway through a task. The features are first offered on an experimental basis in the command-line version and will be extended to other products.

U.S. semiconductor research firm SemiAnalysis published an analysis on Oct. 22 saying Anthropic is running a test that compares usage limits on Claude's paid plans for a subset of users. The limit for each five-hour window increases by about 20%, while the amount usable in a month, converted to API pricing, decreases by about 20%, it said. Reports also spread on X that some requests to Sonnet 5.5 are being routed to a new model. Anthropic has not commented on either.

Anthropic announced on Oct. 22 that "auto mode" will become the default in the web, desktop and mobile apps of its conversational AI "Claude" starting the following week. Instead of users approving each action Claude takes, an automated check running in the background lets safe actions through and blocks risky ones, such as irreversible actions or sending data externally. It applies to the Pro, Max and Team plans, and users can switch back to manual. For the time being, Enterprise and the API will keep the approach in which users opt in themselves.

Anthropic on Oct. 22 made generally available its self-operated Claude developer platform, "Claude Platform," in a form that can be used with Google Cloud authentication and billing. Customers can draw down their committed Google Cloud spend directly and can use the same features as Anthropic's own platform on the same day, including "Managed Agents" for running agents, code execution and a fast version of its top model. It can be chosen separately from the existing Google-operated offering, and Anthropic handles the processing of data.

Anthropic on Oct. 21 released "2026-10-21," the first new version of its Claude API for developers since June 2023. In the new version, sending "temperature," "top_p" or "top_k," which control the randomness of output, returns an error. The company also issued new major versions of its software development kits (SDKs) in 7 languages and its command-line tool, which use this version by default. No end date has been given for the old "2023-06-01" version, which can continue to be used as is.

Anthropic on Oct. 21 began a research preview of "Claude Duet," a new app that alerts users to things they should pay attention to before they ask and keeps working while they are away. It regularly checks connected email and work services to create a morning summary, and continues tasks on a dedicated computer in the cloud. It always asks for confirmation before sending messages, making payments, signing or deleting. It is available to users of the paid "Pro" and "Max" plans in the United States by invitation from a waitlist. It shares usage limits with regular Claude.

Anthropic on Oct. 21 added a feature to "Claude Security," its code vulnerability scanning service for businesses, that continuously scans connected repositories. After a detailed initial examination, it automatically rescans according to the risk level of changes, and when a fix is made, it records the flaw it found as "fixed." Scans also use "Claude Mythos," its top model that is not publicly available. The feature is offered on a trial basis in the business-oriented "Claude Enterprise," with $25,000 worth of free use each month for two months.

AI video generation company Runway announced on Oct. 20 that it has joined "Claude Marketplace," Anthropic's purchasing channel for businesses. Companies that have committed to an annual spend with Anthropic can apply part of it to buying "Runway Creative," Runway's workspace for creating video, images and audio. Runway also joined a similar OpenAI channel in September, making it available through the commitments of both of the two major AI companies.

Anthropic on Oct. 20 published research in which an internal research version of Claude designed, nearly autonomously, proteins that bind to scorpion neurotoxins. Over 64 hours it generated more than 310,000 designs and narrowed down the candidates, and of the 211 tested by outside laboratories, 17 met the criteria for binding firmly to the toxins. The work did not confirm whether they block the toxins' activity or are effective in animals, and the company said the result is early-stage research rather than an antivenom. All design and experimental data were published.

Anthropic has launched "OSS Scanner," which uses its highest-performing AI model to scan critical open-source software for vulnerabilities for free on a recurring basis. The company announced it on Oct. 8 and presented it again on Oct. 19 through its official developer account. The reports are produced by AI without human review, so they may contain errors, the company said. In testing so far, it has found more than 29,000 candidate vulnerabilities and reported about 6,000 of them to developers.

Anthropic is preparing "Personal Finance," a feature that reads bank account data and analyzes spending, for its AI assistant "Claude," U.S.-based TestingCatalog, which tracks new features, reported on Oct. 18. Accounts would be connected through U.S. financial data connection service Plaid, and Claude would build dashboards. During development it was called "Claude Money," and it had also been spotted in the app's interface in September. Anthropic has not announced it, and when it will be offered is unknown. OpenAI launched a similar feature in ChatGPT in May.

An image purporting to show that the name "Mythos 5.5," seen as the next version of "Claude Mythos," which Anthropic calls its most capable model for cyber defense and life sciences research, appeared in the HTML of the company's official website was posted on X on Nov. 1 (Nov. 2 Japan time). Mythos is the same model as the publicly available "Fable," and both previous times the two were released on the same day. However, the image came from an anonymous tip, and when ORIENS retrieved the page on Nov. 3 (Japan time), it still showed the current "Mythos 5.1." Anthropic has not made an announcement. The company is in the process of going public, and cybersecurity stocks were sold off on the day Mythos's existence was reported in March.

Posts of animations drawn entirely in code without video assets, said to have been made with "Claude Fable 5.5," reportedly Anthropic's next model, piled up on X on Nov. 2. The posters claim they were made in about an hour. Anthropic has not announced "Fable 5.5," and there is no way to verify from the outside which model made them. Speculation about the release timing has kept missing since October, and the company is aiming to go public in November.

Anthropic on Oct. 30 (Oct. 31 Japan time) renamed "Max 20x," the $200-a-month plan for its chat AI "Claude," to "Ultra," and the $100-a-month "Max 5x" to "Max." Prices were unchanged. Ultra users who have completed identity verification no longer have five-hour limits, but the weekly limit remains 10 times that of Pro, so the total amount they can use does not increase. A class action has been filed over the "20x" label. OpenAI doubled the limits on ChatGPT Pro the day before.

U.S. research firm SemiAnalysis on Nov. 1 released "GDPx," a new benchmark that measures how far AI can independently complete long tasks performed by professionals. Across 206 tasks in 11 domains, even the top-ranked model, Anthropic's "Claude Opus 5.5," scored only 12.0%. Google's "Gemini 4 Carbon" placed second at 10.9%, at a cost of $16.29 per task, about a third of Opus's $51.41. Excluding three domains heavily affected by safety features, OpenAI's "GPT-6 Astra" takes the top spot.