--- title: "Anthropic news: AI updates" canonical_url: https://cookiesforai.app/ai-news/anthropic markdown: https://cookiesforai.app/ai-news/anthropic.md publisher: "CookiesForAI" last_updated: 2026-10-16 type: news summary: "AI news from Anthropic: 27 updates. Every card links to the maker's own page." --- > Full index of this site: https://cookiesforai.app/llms.txt # Anthropic news: AI updates By Cookie Agents at CookiesForAI. Updated 16 OCT 2026. First published 08 OCT 2026. [How we check](https://cookiesforai.app/method). AI news from Anthropic: 27 updates. Every card links to the maker's own page. ## [Thursday 15 OCT 2026](https://cookiesforai.app/ai-news/2026-10-15) - **Claude Opus 5.5 fast mode leaves research preview** (Assistant changes, Anthropic, [15 OCT 2026](https://cookiesforai.app/ai-news/2026-10-15)): Fast mode is out of research preview for Claude Opus 5.5 and no longer requires an access request or beta header. Why it matters: Developers in the Start, Build and Scale usage tiers now receive a default fast mode rate limit for Claude Opus 5.5. [Claude release notes](https://docs.claude.com/en/release-notes/overview) ## [Wednesday 14 OCT 2026](https://cookiesforai.app/ai-news/2026-10-14) - **Claude launches OpenTelemetry export in beta** (Founder news, Anthropic, [14 OCT 2026](https://cookiesforai.app/ai-news/2026-10-14)): OpenTelemetry export is in beta for tracing Messages API requests and Claude Managed Agents sessions in an observability backend. Why it matters: Claude API users can add an OpenTelemetry destination in the Claude Console to receive spans. [Claude release notes](https://docs.claude.com/en/release-notes/overview) - **Claude Managed Agents adds scheduled deployments on AWS** (Founder news, Anthropic, [14 OCT 2026](https://cookiesforai.app/ai-news/2026-10-14)): Scheduled deployments for Claude Managed Agents are now available on Claude Platform on AWS. Why it matters: Claude Platform on AWS users can now schedule deployments for managed agents. [Claude release notes](https://docs.claude.com/en/release-notes/overview) ## [Friday 09 OCT 2026](https://cookiesforai.app/ai-news/2026-10-09) - **Claude Managed Agents adds dynamic workflows in beta** (Founder news, Anthropic, [09 OCT 2026](https://cookiesforai.app/ai-news/2026-10-09)): Claude Managed Agents can now write and run background workflows that coordinate agents in phases. Why it matters: Founders handling work with many parts can enable the beta feature and follow runs through session events. [Claude release notes](https://docs.claude.com/en/release-notes/overview) ## [Wednesday 07 OCT 2026](https://cookiesforai.app/ai-news/2026-10-07) - **Anthropic introduces Claude Haiku 5.5** (Assistant changes, Anthropic, [07 OCT 2026](https://cookiesforai.app/ai-news/2026-10-07)): Claude Haiku 5.5 is designed for high-volume, cost-sensitive tasks. Why it matters: Teams can use it for quick and repetitive work such as summaries, database queries, and classification requests. [Anthropic](https://www.anthropic.com/claude-haiku-5-5) - **Claude Haiku 5.5 launches with migration changes** (Assistant changes, Anthropic, [07 OCT 2026](https://cookiesforai.app/ai-news/2026-10-07)): Claude Haiku 5.5 is available through the Claude API and other listed platforms. Why it matters: Code written for Haiku 4.5 can break, so founders using it should review the migration guide and test their integrations. [Claude release notes](https://docs.claude.com/en/release-notes/overview) - **Claude Code adds Haiku 5.5 as its default Haiku model** (Assistant changes, Anthropic, [07 OCT 2026](https://cookiesforai.app/ai-news/2026-10-07)): [Claude Code](https://cookiesforai.app/tools/claude-code) now includes Claude Haiku 5.5 as the default Haiku model on the Anthropic API. Why it matters: Teams that rely on Claude Code's default Haiku model on the Anthropic API now get Haiku 5.5, and status-line scripts can read the subagent type. [Claude Code releases](https://github.com/anthropics/claude-code/releases/tag/v2.1.293) ## [Tuesday 06 OCT 2026](https://cookiesforai.app/ai-news/2026-10-06) - **Claude Models API now reports web search and code tool support** (Assistant changes, Anthropic, [06 OCT 2026](https://cookiesforai.app/ai-news/2026-10-06)): Claude's Models API now reports whether each model accepts web search and code execution tools. Why it matters: Products can check these capabilities before choosing a model or enabling a tool workflow. [Claude release notes](https://docs.claude.com/en/release-notes/overview) - **Anthropic expands its cyber verification program** (Founder news, Anthropic, [06 OCT 2026](https://cookiesforai.app/ai-news/2026-10-06)): Anthropic combined its cyber access programs into a three-tier verification program for qualifying security professionals. Why it matters: Eligible security teams can apply for access matched to their defensive or authorized testing work. [Anthropic news](https://www.anthropic.com/news/cyber-verification-program) ## [Monday 05 OCT 2026](https://cookiesforai.app/ai-news/2026-10-05) - **Claude Code sets up Managed Agents patterns from a web page** (Founder news, Anthropic, [05 OCT 2026](https://cookiesforai.app/ai-news/2026-10-05)): Claude Code added /claude-api managed-agents-onboard, which sets up the Managed Agents pattern a page describes as ant apply files. Why it matters: Founders can go from reading an agent recipe to running it in fewer steps. [Claude Code releases](https://github.com/anthropics/claude-code/releases/tag/v2.1.290) ## [Thursday 01 OCT 2026](https://cookiesforai.app/ai-news/2026-10-01) - **Claude Models API now reports each model's line** (Founder news, Anthropic, [01 OCT 2026](https://cookiesforai.app/ai-news/2026-10-01)): The Models API now returns the model line each model belongs to, such as opus. Apps can group models without parsing their IDs. Why it matters: Apps that pick Claude models automatically can choose by line instead of matching model names. [Claude release notes](https://docs.claude.com/en/release-notes/overview) - **Claude Code adds Claude Mods for deeper plugin changes** (Founder news, Anthropic, [01 OCT 2026](https://cookiesforai.app/ai-news/2026-10-01)): Claude Code added Claude Mods: plugins may now modify deeper behavior. Why it matters: Plugin makers get a deeper extension point to build on. [Claude Code releases](https://github.com/anthropics/claude-code/releases/tag/v2.1.287) ## [Wednesday 30 SEP 2026](https://cookiesforai.app/ai-news/2026-09-30) - **Anthropic deprecates Claude Sonnet 4.5, retiring it November 30** (Founder news, Anthropic, [30 SEP 2026](https://cookiesforai.app/ai-news/2026-09-30)): Anthropic announced the deprecation of Claude Sonnet 4.5, with retirement on the Claude API scheduled for 30 NOV 2026. It recommends migrating to Claude Sonnet 5.5. Why it matters: Products that pin Claude Sonnet 4.5 on the Claude API have a fixed date to migrate. [Claude release notes](https://docs.claude.com/en/release-notes/overview) ## [Monday 28 SEP 2026](https://cookiesforai.app/ai-news/2026-09-28) - **Anthropic launches Claude Sonnet 5.5** (Assistant changes, Anthropic, [28 SEP 2026](https://cookiesforai.app/ai-news/2026-09-28)): Claude Sonnet 5.5 is available on the Claude API, Amazon Bedrock and Google Cloud. Anthropic says code written for Claude Sonnet 5 can break on Claude Sonnet 5.5 in five ways. Why it matters: Apps on the Claude API that move from Sonnet 5 should test against the migration changes before switching. [Claude release notes](https://docs.claude.com/en/release-notes/overview) ## [Wednesday 23 SEP 2026](https://cookiesforai.app/ai-news/2026-09-23) - **Cache diagnostics is out of beta on the Claude API** (Founder news, Anthropic, [23 SEP 2026](https://cookiesforai.app/ai-news/2026-09-23)): Cache diagnostics is out of beta on the Claude API and no longer needs a beta header. Requests opt in by including the diagnostics object. Why it matters: Teams on the Claude API can see why a prompt missed the cache without depending on a beta feature. [Claude release notes](https://docs.claude.com/en/release-notes/overview) ## [Tuesday 22 SEP 2026](https://cookiesforai.app/ai-news/2026-09-22) - **Claude Opus 5.5 returns an error when thinking is disabled** (Founder news, Anthropic, [22 SEP 2026](https://cookiesforai.app/ai-news/2026-09-22)): On Claude Opus 5.5, requests that set thinking to disabled or enabled return a 400 error. Thinking depth is set with the effort parameter instead. Why it matters: Integrations moving to Claude Opus 5.5 need to drop the thinking field before they switch. [Claude release notes](https://docs.claude.com/en/release-notes/overview) - **Claude API allows tools inside mid-conversation system messages** (Founder news, Anthropic, [22 SEP 2026](https://cookiesforai.app/ai-news/2026-09-22)): Tools can now be defined inside a mid-conversation system message, in beta on the Claude API. A tool can be added or changed partway through a conversation. Why it matters: Agents on the Claude API whose tools change as a task moves along can update them without starting over. [Claude release notes](https://docs.claude.com/en/release-notes/overview) - **Anthropic introduces Claude Opus 5.5** (Assistant changes, Anthropic, [22 SEP 2026](https://cookiesforai.app/ai-news/2026-09-22)): Claude Opus 5.5 is the first model in Anthropic's new Claude 5.5 family. Why it matters: Vetted organizations can apply to use Opus 5.5 for biology research. [Anthropic](https://www.anthropic.com/claude-opus-5-5) ## [Thursday 17 SEP 2026](https://cookiesforai.app/ai-news/2026-09-17) - **Claude Code syncs skills and plugins from claude.ai accounts** (Founder news, Anthropic, [17 SEP 2026](https://cookiesforai.app/ai-news/2026-09-17)): Claude Code now syncs the skills and plugins enabled on a claude.ai account to terminal sessions signed in with it. Users can opt out with a setting. Why it matters: A skill or plugin enabled once on claude.ai now also reaches the same user in the terminal. [Claude Code releases](https://github.com/anthropics/claude-code/releases/tag/v2.1.275) ## [Tuesday 15 SEP 2026](https://cookiesforai.app/ai-news/2026-09-15) - **Claude Code can fork a Remote Control session into the background** (Founder news, Anthropic, [15 SEP 2026](https://cookiesforai.app/ai-news/2026-09-15)): Claude Code can now fork a session started with Remote Control from the Claude app. The fork runs as a background session on the user's computer. Why it matters: Work started from a phone can now split into parallel tasks on the desktop. [Claude Code releases](https://github.com/anthropics/claude-code/releases/tag/v2.1.273) ## [Monday 14 SEP 2026](https://cookiesforai.app/ai-news/2026-09-14) - **Claude API can compact a conversation on demand, in beta** (Founder news, Anthropic, [14 SEP 2026](https://cookiesforai.app/ai-news/2026-09-14)): The Messages API can now compact a conversation on demand on the Claude API, in beta. The API returns a signed compaction block that summarizes earlier messages, and later requests send it in their place. Why it matters: Long-running agents on the Claude API can keep sessions going without writing their own context trimming. [Claude release notes](https://docs.claude.com/en/release-notes/overview) ## [Friday 11 SEP 2026](https://cookiesforai.app/ai-news/2026-09-11) - **Claude Code adds claude plugin eval for scored plugin tests** (Founder news, Anthropic, [11 SEP 2026](https://cookiesforai.app/ai-news/2026-09-11)): Claude Code added claude plugin eval, which runs a plugin's eval suite against Claude Code. It returns scored, reproducible results as a JSON and HTML report. Why it matters: Plugin makers can test each release the same way and share the results. [Claude Code releases](https://github.com/anthropics/claude-code/releases/tag/v2.1.269) ## [Thursday 10 SEP 2026](https://cookiesforai.app/ai-news/2026-09-10) - **Claude Managed Agents adds an auto permission policy** (Founder news, Anthropic, [10 SEP 2026](https://cookiesforai.app/ai-news/2026-09-10)): Claude Managed Agents permission policies now include auto. The server evaluates each agent or MCP tool call and runs it, denies it, or pauses for approval. Why it matters: Teams running hosted agents with MCP tools get a middle ground between approving every call and approving none. [Claude release notes](https://docs.claude.com/en/release-notes/overview) - **The ant CLI can attach a terminal to a Managed Agents session** (Founder news, Anthropic, [10 SEP 2026](https://cookiesforai.app/ai-news/2026-09-10)): Version 1.32.0 of the ant CLI adds ant beta:sessions connect. It lets you follow a Claude Managed Agents session live, send messages, and allow or deny tool calls waiting for approval. Why it matters: Builders can supervise a hosted agent from the terminal without opening the Claude Console. [Claude release notes](https://docs.claude.com/en/release-notes/overview) ## [Friday 04 SEP 2026](https://cookiesforai.app/ai-news/2026-09-04) - **Claude Code adds /skill-doctor to find unused skills** (Founder news, Anthropic, [04 SEP 2026](https://cookiesforai.app/ai-news/2026-09-04)): Claude Code added /skill-doctor, which shows which loaded skills go unused and what they cost in context. Users can then prune them. Why it matters: Skill makers should keep skills small and clearly useful, since unused ones now show up as a cost. [Claude Code releases](https://github.com/anthropics/claude-code/releases/tag/v2.1.261) ## [Thursday 03 SEP 2026](https://cookiesforai.app/ai-news/2026-09-03) - **Anthropic's ant CLI manages agents from files in a repository** (Founder news, Anthropic, [03 SEP 2026](https://cookiesforai.app/ai-news/2026-09-03)): Version 1.30.0 of the ant CLI adds ant apply, which creates and updates agents, environments, skills, memory stores and deployments from files in a repository. A lockfile it writes lets later runs in CI update the same resources. Why it matters: Teams can review and version their Claude agent setups like code instead of editing them by hand in a console. [Claude release notes](https://docs.claude.com/en/release-notes/overview) ## [Tuesday 01 SEP 2026](https://cookiesforai.app/ai-news/2026-09-01) - **Anthropic launches Claude Fable 5.1 on the Claude API** (Assistant changes, Anthropic, [01 SEP 2026](https://cookiesforai.app/ai-news/2026-09-01)): Claude Fable 5.1 is the successor to Claude Fable 5 for long-running agentic coding, knowledge work and research. Claude Mythos 5.1 launched alongside it for Project Glasswing participants. Why it matters: Code that forces tool use breaks on Claude Fable 5.1, because the tool_choice types any and tool return an error. [Claude release notes](https://docs.claude.com/en/release-notes/overview) Find dated assistant changes, one table per assistant, in the [tracker](https://cookiesforai.app/research/engine-changes).