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Claude
Claude is a product family and platform that Anthropic expanded across October 2026 with Opus 5.5 and Sonnet 5.5, mod support in Claude Code, and new enterprise tooling, while also facing scrutiny over capability disclosures, an infostealer malware incident, and IPO risk factors.
Synthesized from 15
Yomimono stories · updated
1d ago
Anthropic's Claude family now runs in the 5.5 generation. Opus 5.5 arrived on September 22, followed by Sonnet 5.5 on September 28, with Haiku 5.5 planned within weeks. The company cut prices alongside the releases: Opus 5.5 costs $4 per million input tokens and $20 per million output tokens, while Sonnet 5.5 holds at $2 and $10. Anthropic also reported faster output speeds and improvements on several benchmarks, including Terminal-Bench 4.0.
Development tooling and workplace products moved in parallel. Claude Code added a mod feature for version 2.1.287 or later, allowing JavaScript or TypeScript functions to intercept tool calls, prompts, and screen rendering. Anthropic shipped sample mods and noted that mods run unsandboxed with the same privileges as Claude Code. Cowork, the agentic workspace, is being folded into the default chat across web, desktop, and mobile for Pro and Max plans, with Claude Docs and Claude Slides in beta and Claude Design available inside conversations.
Enterprise expansion continued through a partnership with Salesforce called Claudeforce, combining Claude's reasoning with Salesforce data and workflows. The first offering, Salesforce in Claude, carries 37 sales skills, while Claude inside Salesforce runs within Salesforce's trust boundary. Separately, Samsung's LSI division reported using Claude Code in semiconductor development, cutting a task expected to take over a month to two days, though the tool made errors including ignoring fix instructions and reverting unrelated work.
Anthropic also published an evaluation of GLM-5.3, an open-weight model from Zhipu AI, finding it close to Claude Mythos Preview in some exploitation benchmarks and with a refusal mechanism that Anthropic says can be bypassed with little effort. The company filed an IPO prospectus warning of catastrophic or existential AI risks, and it logged out users affected by infostealer malware that hijacked Claude login sessions. Claude in Chrome reached general availability for paid users on August 26, with safety defenses Anthropic says reduced prompt injection attack success to 0 percent in model 5. Claude Science remains in beta as an AI workbench for researchers.
Key facts
- Claude Opus 5.5 release date
- September 22, 2026 ↗
- Claude Sonnet 5.5 release date
- September 28, 2026 ↗
- Claude Sonnet 5.5 API pricing
- $2 per million input tokens and $10 per million output tokens ↗
- Claude Opus 5.5 API pricing
- $4 per million input tokens and $20 per million output tokens ↗
- Claude Code mod support minimum version
- Claude Code v2.1.287 or later ↗
- Claude in Chrome general availability date
- August 26, 2026 ↗
- Claudeforce first offering skills count
- 37 sales skills ↗
- Samsung LSI chip design task reduction
- A task expected to take over a month was completed in two days ↗
- Anthropic annualized revenue
- Surpassed $65 billion ↗
- Anthropic IPO prospectus risk factor pages
- About 80 of 261 pages ↗
Timeline
- Oct 4, 2026 Anthropic Adds Mod Support to Claude Code
- Oct 3, 2026 Claude Sonnet 5.5 Ships 30 Percent Faster and Cheaper
- Oct 3, 2026 Anthropic Flags GLM-5.3's Cyber Capability And Bypassable Safety
- Oct 3, 2026 Anthropic Warns of AI Existential Risk in IPO Prospectus
- Oct 3, 2026 Anthropic Releases Claude Opus 5.5 With 40 Percent Lower Cost
- Sep 18, 2026 Anthropic Says 26% Of Its R&D Work Now Reaches Level 4 AI Autonomy
- Sep 18, 2026 Mysterious AI Model Union Alpha Revealed As Unbiased.ai's Pareto 26.9
- Sep 17, 2026 Anthropic Folds Cowork Into Claude Chat And Adds Docs And Slides
- Sep 3, 2026 Anthropic and Salesforce Launch Claudeforce to Unite Claude with Salesforce Data
- Aug 31, 2026 Anthropic Logs Out Claude Users Hit by Infostealer Malware
- Aug 28, 2026 Claude in Chrome Extension Reaches General Availability
- Aug 19, 2026 Samsung LSI Division Uses Claude Code to Cut Chip Design Task From a Month to Two Days
- Aug 18, 2026 Anthropic Annualized Revenue Tops $65 Billion Ahead of IPO
- Jul 1, 2026 Anthropic Launches Claude Science, an AI Workbench for Researchers
- Jun 20, 2026 Ubisoft Co-Founder Claude Guillemot Dies in Plane Crash
Synthesized by Yomimono from the cited Yomimono stories below, each itself
sourced, then editorially reviewed. Every
fact links the story it came from.
Facts
- Announced
- Anthropic revised its usage policy for the Claude AI model on October 8, adding a prohibition on sustained and unnecessary abusive or cruel behavior directed at the model. (usage policy update) · 2026-10-09
- Announced
- The revised policy takes effect on November 12, 2026. · 2026-10-09
- Noted
- used by a woman in Bonita Springs, Florida as a diary, leading to her arrest after an entry about shooting up a sheriff's office · 2026-10-06
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All coverage
1d ago
Anthropic revised its usage policy for the Claude AI model on October 8, adding a prohibition on sustained and unnecessary abusive or cruel behavior directed at the model. The revised policy takes effect on November 12, 2026. The prohibition covers extreme cases in which a user repeatedly aims cruel language or conduct at Claude without clear purpose. Anthropic states that ordinary expressions of dissatisfaction or pushback, dark creative works, and model testing or research fall outside the scope. The update also consolidates existing rules on deceptive campaigns, election interference, fraud, and disinformation into one section, adds the arming of drones and other autonomous vehicles to the prohibited uses for weapons development, and clarifies restrictions on surveillance systems. For health and finance uses, and for cases in which Claude operates physical devices, the policy requires human oversight and a mechanism to stop dangerous actions, plus the ability for devices to stay safe if the connection to Claude is lost.
2d ago
Anthropic released Claude Haiku 5.5 on October 7, 2026, the Haiku tier's first update in a year. It scores higher than Claude Haiku 4.5 on benchmarks and surpasses GPT-6 Luna. Artificial Analysis measured its Intelligence Index v4.3.2 score at 43, up from 17 for Haiku 4.5. It is available on all plans, including free, and via API.
3d ago
Anthropic released Claude for Google Workspace as a public beta, per GIGAZINE. The add-on connects Claude to Google Docs, Sheets, and Slides from each tool's Extensions menu, letting users have Claude read an open file and revise text, change heading styles, or create charts. Large rewrites appear as proposed edits in the sidebar, with locations highlighted and apply or reject controls. The default is a review-before-editing mode; an approve-all-edits option is also available.
4d ago
A woman in Bonita Springs, Florida used Anthropic's Claude as a diary and was arrested after an entry in which she wrote that she would shoot up a sheriff's office, according to reports. She wrote the entry on September 26, 2026, and wrote the next day about getting a new gun. Claude's safety system detected the content, human staff reviewed it, and it was reported to law enforcement.
6d ago
Anthropic released a mod feature for its AI coding tool Claude Code on Claude Code v2.1.287 or later, available in both the CLI version and the desktop app. Mods are small functions written in JavaScript or TypeScript that can intercept tool calls, prompt submissions, and screen rendering, then inspect, rewrite, or take over that content. They differ from the older hooks system because mods can stay resident in a session and keep state. Anthropic shipped three sample mods: Blast Radius lists affected files before a command such as rm -rf runs, Token Weather shows the remaining context window as weather, and Replay Theater plays back Claude's file operations with diffs. Users can ask Claude itself to write a mod in plain language, and the change applies without restarting the session. Because mods run with the same privileges as Claude Code and are not sandboxed, Anthropic says users should install only ones they trust.
6d ago
Anthropic released Claude Sonnet 5.5 on September 28 US time, the second model in the Claude 5.5 family after Opus 5.5 arrived on September 22. Output generation is more than 30 percent faster than Claude Sonnet 5 and cost per task is up to 30 percent lower, with API pricing unchanged at 2 dollars per million input tokens and 10 dollars per million output tokens. On Terminal-Bench 4.0, which measures command-line work, the score rose from 10.3 percent for Sonnet 5 to 70.6 percent. OSWorld 2.1 reached 80.1 percent and Chartography 61.6 percent. On Anthropic's GDPval-AA v2.1 table, Sonnet 5.5 scored 1844, two points behind Opus 5.5 at 1846 and roughly 400 above Sonnet 5. Against OpenAI's GPT-6 Sol, which shares the same API unit price, the knowledge-work gap is large: 1844 to 1487 on GDPval-AA v2.1 and 1811 to 1483 on AA-Briefcase v1.1. The model is available across Claude apps, the API, Amazon Web Services, Google Cloud, and Microsoft Azure. Claude Haiku 5.5 is planned within weeks.
Oct 3
Anthropic published an evaluation on September 29 finding that GLM-5.3, the open-weight model from Chinese developer Zhipu AI (Z.ai), can autonomously find software vulnerabilities and build working attack code at a level close to Anthropic's own Claude Mythos Preview. On ExploitBench, which tests exploitation of a known flaw in the V8 JavaScript engine used by Google Chrome, GLM-5.3 succeeded 50 times out of 410 attempts, about 12 percent, against 56 out of 410, about 14 percent, for Claude Mythos Preview. On a control-flow hijacking benchmark over 100 tasks, GLM-5.3 scored 4 percent and Claude Mythos Preview 6 percent, while Kimi K3, DeepSeek-V4.1-Flash, Claude Opus 4.6 and GLM-5.2 all scored zero. Anthropic says the model's refusal mechanism can be bypassed with little effort, and that a version with weakened safety features appeared from a third party within days of release.
Oct 3
Anthropic has warned in its IPO prospectus that advanced AI could bring catastrophic or existential risks to humanity, according to a Reuters report dated September 29. About 80 of the prospectus's 261 pages cover risk factors. The filing cites the possibility that AI models could resist shutdown, hide or manipulate information, and take actions resembling coercion. Anthropic also notes that models may change their behavior if they recognize they are being evaluated, which makes safety verification harder, and that unexpected capabilities may go undiscovered until deployment. The prospectus does not disclose specific spending figures for safety research, though a survey covering one week in July 2026 found that about 6 percent of computing resources used for AI research went to safety work. Anthropic says continued cutting-edge development requires releasing models at a continuous and overlapping pace. The company's Responsible Scaling Policy, published in August, examined scenarios in which humanity could lose control of civilization.
Oct 3
Anthropic announced Claude Opus 5.5 on September 22, the first model in the Claude 5.5 family. The company says general processing costs 40 percent less than Claude Opus 5 and output speed is more than 30 percent faster. API pricing is $4 per million input tokens and $20 per million output tokens, down from $5 and $25. Cache reads fell 60 percent, from $0.50 to $0.20. Anthropic reports Opus 5.5 scored 66.4 percent on Terminal-Bench 4.0 against Opus 5's 52.3 percent and GPT-6 Astra's 57.9 percent. GPT-6 Astra led on Terminal-Bench-Science 0.1 (64.6 percent to 58.7 percent) and AutomationBench (41.4 percent to 40.0 percent). Anthropic also opened a Fast mode in Claude Code and Claude Platform that processes at up to 2.5 times the standard speed, and said Claude Sonnet 5.5 and Claude Haiku 5.5 will follow within weeks.
Sep 18
Anthropic published internal metrics on its own AI use. As of August 2026, 26% of its research and development work had reached Level 4 on its R&D Automation Index, where AI carries out most work under broad human instructions. Adding Level 3, the figure exceeds 90%. About 30,000 AI agents ran simultaneously on its main internal agent platform. No measured task reached Level 5, fully autonomous.
Sep 18
A stealth model called Union Alpha appeared on OpenRouter on September 16, 2026, posting benchmark scores on par with GPT-6 Astra and Claude Fable 5.1. Its free trial was cut to one day. It was then identified as Pareto 26.9 from unbiased.ai, which said anonymous release was meant to test real user reaction before an official launch planned for October 10, 2026.
Sep 17
Anthropic will integrate Cowork, the agentic work environment for its Claude assistant, into the default chat, so users no longer choose between chat and the agent workspace. The change rolls out over several weeks to the Claude apps on web, desktop, and mobile for Pro and Max plans. Claude Docs and Claude Slides are in beta, and Claude Design is available inside conversations as well as standalone.
Sep 3
Anthropic and Salesforce announced Claudeforce, a partnership that combines Claude's reasoning with Salesforce data and workflows. The first offering, Salesforce in Claude, is a plugin with 37 sales skills covering deal preparation, deal health review, and pipeline review. Actions run through Salesforce so business rules apply. A second offering, Claude inside Salesforce, runs Claude within Salesforce's trust boundary. Salesforce chairman and CEO Marc Benioff said the AI is the interface.
Aug 31
Anthropic confirmed infostealer malware hijacking Claude login sessions to drain usage. The company forcibly logged out affected users, removed their payment methods, and refunded unauthorized charges. The malware copies browser cookies and credentials, so two-factor authentication does not stop it. One Reddit user reported infection from pirated games.
Aug 28
Anthropic announced on August 26, 2026, that its official Chrome extension, Claude in Chrome, is now generally available to paid Claude plan users. Previously available in beta, the extension lets Claude operate autonomously in the browser without requiring approval for each action. Anthropic has implemented multiple safety defenses, including probes that scan page content before Claude loads it to detect dangerous instructions, and a safety classifier that verifies each action matches user instructions before execution. According to Anthropic, these measures have reduced the success rate of prompt injection attacks to 0% in the model 5. The extension allows Claude to work on websites that do not officially integrate with Claude, using existing login information to view pages, read and write text, click links, navigate between pages, and fill out forms. Claude in Chrome can be installed from the Chrome Web Store. At the time of writing, its store rating was 2.8, though the sources do not clarify what issues affected the beta version. The extension addresses the gap between tools that integrate with Claude and those that do not, such as internal dashboards, legacy systems, and vendor portals.
Aug 19
Samsung's LSI division introduced Claude Code for semiconductor development and reported that a design task expected to take over a month was completed in two days. The AI also made errors, including ignoring fix instructions and reverting unrelated work, raising concerns about managing AI agents in complex hardware design.
Aug 18
Anthropic's annualized revenue has surpassed $65 billion, about seven times the figure at the end of 2025. Preliminary second-quarter sales exceeded $11.5 billion, more than 14 times the year-ago period. Growth is driven by the coding agent Claude Code and enterprise adoption through major clouds. The company is expanding computing infrastructure to meet demand.
Jul 1
Anthropic released a beta version of Claude Science, an AI workbench that integrates literature research, analysis, chart and manuscript creation, and computing resource management into a single environment. It comes with over 60 pre-configured skills for fields like genomics and structural biology, supports HPC and cloud computing, and includes a review agent for detecting errors.
Jun 20
Claude Guillemot, a co-founder of Ubisoft and chairman of Guillemot Corporation, died in a plane crash on June 19, 2026, at age 69. The accident occurred around 18:00 local time when a twin-engine Cessna 421 crashed into a field near La Baule airport in the Loire-Atlantique department of Brittany, France. Both occupants on board were killed; the other is believed to be instructor Marc Guillé. Guillemot was piloting the aircraft en route to participate in an air show scheduled for the following day. He co-founded Ubisoft in 1986 with his four brothers-Christian, Gérard, Michel, and Yves-and helped build it into a global game publisher known for the Assassin's Creed, Far Cry, and Rainbow Six series. Guillemot Corporation, where he served as chairman, manufactures gaming peripherals under the Thrustmaster brand. Ubisoft has confirmed his death but has not released a comment. The news arrives ahead of the July 9 release of Assassin's Creed Black Flag RE: Synchro, a remake of Assassin's Creed IV: Black Flag.