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Anthropic news,
as it happens.

Every Anthropic launch, price change, limit change and retirement, summarized with what you need to do about it.

Anthropic· Infrastructure· 2 discussions

Anthropic releases FlashProve, an open-source prototype for proving which model produced a response

Anthropic published research on provable inference: a cryptographic proof (a zkSNARK) that a response came from a specific committed set of model weights, checkable by a user who does not have the weights. The post says it could help detect a model silently swapped by a routing service or tampered with by an attacker, and could give evaluators and regulators a way to check what is being served.Anthropic· Infrastructure

Claude Messages API adds message threads in public beta, caching the conversation on the server

Anthropic's ClaudeDevs account says message threads are now in public beta on the Messages API. The API keeps the conversation on the server between turns, so a request carries only the new messages and the previous message ID instead of the full history, and Claude starts responding sooner.RumorAnthropic· Models· 2 discussions

Claude Mythos 5.5 is not announced, but Anthropic's website source mentions it

Anthropic has not announced a Claude Mythos 5.5. Several X accounts report that the HTML source of Anthropic's Claude Mythos page (anthropic.com/claude/mythos) names it.Anthropic· Models

Anthropic sets thousands of Claude agents to red-team training-data monitors for emergent misalignment

Anthropic published research on automating red-teaming for subtle emergent misalignment, saying red-teaming is vital to model safety testing but limited by researchers' time. Everything below is Anthropic's own account, from its post and its Alignment Science Blog write-up.Anthropic· Models

Claude Code 2.1.316 deprecates fast mode for Opus 4.8, with removal on November 30

Claude Code v2.1.316, released October 30, 2026, per its release notes:Anthropic· Models· 1 discussions

Anthropic confirms a Claude Code prompt change to stop Opus 5.5 recreating specific games

Anthropic has confirmed that it added two sentences to Claude Code's prompt on Opus 5.5 to steer the model away from recreating a specific existing game. Game Developer reported it on October 30.Anthropic· Products· 1 discussions

Anthropic renames its Max plans to Max and Ultra, and removes the 5-hour limit for verified Ultra accounts

Anthropic announced on X that it is renaming its Max plans: Max 5x becomes Max and Max 20x becomes Ultra. Prices do not change: Max stays at $100 a month and Ultra at $200. Anthropic says existing subscribers need to do nothing.OpenCode Go· Coding· 1 discussions

OpenCode says you can sign in with a Claude subscription again

The OpenCode account announced on X on October 30 that users can now use their Claude subscription in OpenCode, linking a demo video from Daniel Smolsky ("subscriptions in @opencode are back"). The post had about 861 points and 68 comments on X within the hour.AlertCursor· Coding· 10 discussions

A trojanized Claude Code extension was served from Cursor's extension marketplace

Cursor says it identified a security incident involving a modified Claude Code VS Code extension distributed through its extension marketplace, affecting at most 5,000 users. Cursor says the malicious version was not developed by Anthropic and that no other extension is affected.Anthropic· Coding

Claude Code 2.1.314 adds a setting to block writes outside the working directories and idle compaction

Claude Code v2.1.314, released October 29, 2026, per its release notes:Anthropic· Infrastructure

Claude API raises the maximum request size from 32 MB to 128 MB

Anthropic's ClaudeDevs account says the maximum request size for Messages and Token Counting on the Claude API went from 32 MB to 128 MB. It says image-heavy requests, such as long computer-use sessions and large PDFs, were hitting 32 MB with plenty of context window left, and that this gives about 4x more room.Anthropic· Models

Anthropic says it trained Claude to flag possible misuse in its own conversations

Anthropic described a safeguard it calls self-assessment: right after Claude responds, it gives a preliminary safety assessment of the conversation, flagging potential misuse. Everything below is Anthropic's own account, from its post and a new Safeguards blog.Anthropic· Coding

Claude Code adds CLAUDE_CODE_SUBAGENT_EFFORT to set a lower effort for subagents

Claude Code's @bcherny said the environment variable CLAUDE_CODE_SUBAGENT_EFFORT has landed. Running CLAUDE_CODE_SUBAGENT_EFFORT=low claude sets the effort level subagents use, and it can also be set in a custom agent's config. He was replying to a user who asked whether subagents could default to a lower effort instead of inheriting the main session's.Anthropic· Coding

Users measure Claude Code's background-agent status summaries at 16–20% of requests; not confirmed by Anthropic

Flamerix AI published a write-up, shared on Hacker News (323 points and 100 comments by October 29), saying Claude Code spends a large share of its usage on a feature that updates the status line of background agents. It says that about every 30 seconds, for each background agent, Claude Code sends the agent's whole transcript to the agent's own model (usually Opus) and asks for a 3–5 word description of its latest action. The result only updates the agent's row in the agents panel.Anthropic· Coding

Anthropic finds no regression behind Claude Code usage complaints, and fixes a few token-burn bugs

Boris Cherny of the Claude Code team posted on X on October 28 that the team went through all the session IDs users shared after complaints that Claude Code was using up limits faster. He says they found a few smaller issues that made some sessions burn through tokens faster than they should, and that fixes are rolling out now.Anthropic· Products

Anthropic adds a gallery of ready-to-use artifacts to Claude for Legal

Anthropic added a gallery of ready-to-use artifacts to Claude for Legal: interactive tools, such as trackers and dashboards, that legal teams can adapt with their own data and connectors and share with colleagues. Each artifact opens with an example, and Anthropic says each answer or output links to its source.Anthropic· Products

Claude Enterprise adds smart reports, in-app surveys and pooled group budgets

Anthropic says smart reports, in-app surveys and pooled group budgets are generally available for Claude Enterprise, though availability varies by configuration, including for organizations with a HIPAA configuration or customer-managed encryption keys.Anthropic· Products· 9 discussions

Anthropic files an S-1 with the SEC for a proposed IPO

Anthropic said on X that it has filed an S-1 registration statement with the US Securities and Exchange Commission related to its proposed initial public offering, with details in a post on its site. Anthropic says it intends to list its Class A common stock on the Nasdaq Global Select Market under the symbol "ANT". The number of shares and the price range have not been set. The statement has not yet become effective, so the shares cannot be sold until it does; the offering will be made only by prospectus, and Anthropic names Goldman Sachs and Morgan Stanley as the sources for copies of the preliminary prospectus.Anthropic· Models

Anthropic says an unreleased Claude model built five exploit chains, including a one-click Chrome attack with 62 CVEs patched in Chrome 156

Anthropic's Frontier Red Team published "Discovering and exploiting vulnerabilities in critical, real-world software with Claude" on October 27. The account below comes from a post summarizing the article, not from the article itself.Anthropic· Models· 2 discussions

Anthropic shares early results from drug-development partnerships

Anthropic says its scientists have spent the past few months in research partnerships with six organizations developing new medicines (BigHat Biosciences, Bristol Myers Squibb, Divergence Labs, Enveda, Generate Biomedicines and The Column Group), and have begun drug discovery efforts of their own. In a blog post it shares early results and says it has learned how Claude can support the many stages of drug development. The post also describes how this work fits Anthropic's wider ambitions in the life sciences.
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