--- title: "Opus 5.5 Default and More for Your Firm | By The People Tech" description: "Claude roundup, 13 Nov 2026: Opus 5.5 is now the default on Pro, Max, Ultra and Team plans, and Enterprise can tag project spend by cost code." url: https://bythepeople.tech/claude/whats-new/claude-roundup-2026-11-13 --- [Claude for Business](/claude) [What’s New](/claude/whats-new) Claude roundup, 13 November 2026 Weekly roundup Released 13 November 2026 · 6 min read # Your _default model_ changed, and spend gets a cost code. Anthropic says Claude Opus 5.5 is now the default model in Claude on Pro, Max, Ultra and Team plans, and recommends it as the daily driver for knowledge work. Separately, eligible Enterprise organizations can now tag projects with codes they already use, like a charge code or client-matter number, and see most spend by tag (beta). At a glance Default model Claude Opus 5.5 Opus 5.5 price $4 / $20 per M tokens Cost-code project tags Enterprise, beta Thinking blocks One-way into Fable/Mythos 5.2 Anthropic IPO range $70.00 to $78.00 a share On this page * [What changed](#changed) * [What it means](#means) * [What to do this week](#steps) * [Questions](#questions) Published by [Fatjon (Tony) Kalemaj](/about-us/fatjon-tony-kalemaj) COO & Head of Applied AI 01 · What changed ## What Anthropic shipped this week. This roundup covers one change most users will notice and several that matter to admins, compliance and engineers. The default model moved to Opus 5.5, which costs more per token than Sonnet 5.5, so the guidance you gave people on which model to use may now be out of date. Enterprise admins got cost-code tags and Security posture data in the Compliance API, both in beta. Claude Code shipped three releases with new admin controls, and Anthropic launched the roadshow for its proposed initial public offering. ### 1. Opus 5.5 is the default 1\. Opus 5.5 is now the default model on Pro, Max, Ultra and Team plans. Anthropic lists it at $4 / $20 per million tokens (input / output), against $2 / $10 for Sonnet 5.5 and $0.10 / $0.50 for Haiku 5.5. ### 2. Cost-code project tags 2\. Eligible Enterprise organizations can tag projects with codes they already use, like a charge code or client-matter number, and see most spend in those projects by tag. The feature is in beta. ### 3. Security posture API 3\. The Compliance API now returns an organization's current Security posture results, in beta for Claude Enterprise. The Activity Feed records changes to attestations on the Security posture page. ### 4. Thinking blocks across models 4\. Claude Fable 5.2 and Claude Mythos 5.2 read other models' thinking blocks on the Claude API and Claude Models on Google Cloud (Google managed). No other model reads theirs: moving off either one drops those blocks, and the request still succeeds. ### 5. Claude Code admin controls 5\. Version 2.1.319 adds a setting that denies a tool call instead of waiting on a permission prompt, a way to stop feature-flag fetching without turning off telemetry, and spend for today, this week and this month in /usage for developers behind a Claude apps gateway with no spend limit. ### 6. Claude Code Mode and more 6\. Version 2.1.323 adds Code Mode, an experimental opt-in in which Claude writes JavaScript to call its tools, and an organization can turn it off. Version 2.1.322 adds fast mode on Vertex in the global, us and eu regions. ### 7. Claude for Manufacturing 7\. A plugin with 17 skills that drafts quotes, quality reports and supplier requests from a plant's own records, for a person to review and approve. It connects to Autodesk Fusion, Infor, Microsoft 365 and Oracle NetSuite. ### 8. Anthropic IPO roadshow 8\. Anthropic has launched the roadshow for a proposed offering of 825,000,000 Class A shares, expected between $70.00 and $78.00 per share. It has applied to list on the Nasdaq Global Select Market under the symbol ANT. 02 · What it means ## What it means for _your_ seat. For most firms the change people will feel is the new default model: the same chat window now runs Opus 5.5 unless someone picks another. The rest of the roundup is for the people who run Claude: finance can start mapping spend to the codes it already uses, compliance gets attestation data through an API, and engineers have new rules about thinking blocks and new Claude Code controls. ### Leadership Opus 5.5 is now the default on Pro, Max, Ultra and Team plans, and Anthropic recommends it for research, analysis, memos, reports, spreadsheets and decks. If your firm told people to use Sonnet for daily work and save Opus for heavy analysis, Anthropic says to reconsider, arguing that a more capable model can finish a task by doing less work. Anthropic also published JPMorganChase's account of rolling Claude out beyond engineers, to product teams and to risk and controls assessments. ### Operations Project tags let eligible Enterprise organizations tag projects with codes they already use, like a charge code or client-matter number, and see most spend in those projects by tag. A firm that tracks work by deal or by fund could tag the project for a data room review or an IC memo with that code. The feature is in beta and covers most spend, so check what it captures before it feeds a cost allocation. ### Risk and compliance The Compliance API now returns an organization's current Security posture results, in beta for Claude Enterprise, and the Activity Feed records changes to attestations on the Security posture page. That puts attestation changes and current results in the same API your team may already pull audit data from. In Claude Code, the new permissions.denyInsteadOfPrompting setting denies a tool call that would wait on a permission prompt and lets the turn continue. ### IT and engineering If your application moves a conversation from Claude Fable 5.2 or Claude Mythos 5.2 to any other model, including Opus 5.5 or Fable 5.1, the API drops the thinking blocks, though the request still succeeds. Claude Code 2.1.323 adds Code Mode as an experimental opt-in that an organization can turn off, and 2.1.319 adds /claude-api latency-optimize to find where your Claude API code makes people wait. Teams on Vertex get fast mode in the global, us and eu regions from 2.1.322. 03 · This week ## What to do this week. 0 of 3 done 1. 01 · Update your model guidance : Tell people Opus 5.5 is now the default on Pro, Max, Ultra and Team plans. Say when Sonnet 5.5 or Haiku 5.5 is the better pick, for example a quick lookup or a weekly status report from a clear brief. 2. 02 · Map project tags to your existing codes : If you are on Enterprise, check whether your organization is eligible for project tags. Pick the charge or client-matter codes you already use and tag a few projects while the feature is in beta. 3. 03 · Set your Claude Code policy : Decide whether Code Mode stays off for your organization and whether permissions.denyInsteadOfPrompting suits your unattended sessions. Write the decision into your managed settings. Sources Facts and dates are Anthropic’s own. What it means and what to do are our view, from the firms we work with. Drafted with Claude from these sources, checked against them figure by figure, and published 13 November 2026. * [Anthropic: Using Claude Opus 5.5 as your daily driver for knowledge work](https://claude.com/resources/articles/using-claude-opus-5-5-as-your-daily-driver-for-knowledge-work) * [Claude Help Center release notes](https://support.claude.com/en/articles/12138966-release-notes) * [Claude Platform release notes](https://platform.claude.com/docs/en/release-notes/overview) * [Claude Code v2.1.319](https://github.com/anthropics/claude-code/releases/tag/v2.1.319) * [Claude Code v2.1.322](https://github.com/anthropics/claude-code/releases/tag/v2.1.322) * [Claude Code v2.1.323](https://github.com/anthropics/claude-code/releases/tag/v2.1.323) * [Anthropic: Introducing Claude for Manufacturing](https://claude.com/resources/articles/claude-for-manufacturing) * [Anthropic: JPMorganChase expands Claude Code to more employees](https://claude.com/resources/articles/jpmorganchase-expands-claude-code) * [Anthropic: Roadshow for proposed initial public offering](https://www.anthropic.com/news/roadshow-launch) ## The short answers. ### What is the default model in Claude now? Anthropic says Claude Opus 5.5 is now the default model in Claude on Pro, Max, Ultra and Team plans. It recommends Opus 5.5 as the daily driver for knowledge work such as research, analysis, memos, reports, spreadsheets and decks. ### How much does Claude Opus 5.5 cost compared with Sonnet 5.5? Anthropic lists Opus 5.5 at $4 per million input tokens and $20 per million output tokens, Sonnet 5.5 at $2 / $10 and Haiku 5.5 at $0.10 / $0.50. Anthropic argues that a more capable model can finish a task by doing less work, which can offset much of its higher price per token. ### Can Claude Enterprise track spend by cost code? Yes, in beta. Eligible Enterprise organizations can tag projects with codes they already use, like a charge code or client-matter number, and see most spend in those projects by tag. ### What happens to thinking blocks when you switch away from Claude Fable 5.2? No other model reads thinking blocks from Claude Fable 5.2 or Claude Mythos 5.2, so when a conversation moves from either one to a model outside that pair, the API drops those blocks and the request still succeeds. The reverse works: on the Claude API and Claude Models on Google Cloud (Google managed), Fable 5.2 and Mythos 5.2 read thinking blocks from models such as Opus 5.5, Sonnet 5.5 and Haiku 5.5. Read next [12 November 2026 : Self-hosted Claude Managed Agents (private beta)](/claude/whats-new/claude-managed-agents-self-hosted) [10 November 2026 : Claude Sheets, Whiteboards and Data](/claude/whats-new/claude-sheets-whiteboards-data) [9 November 2026 : Claude Fable 5.2: lower price, 1M context](/claude/whats-new/claude-fable-5-2) Newsletter ## Keep up with _every_ release. One email when something ships or retires that matters to a company: what changed, what it means, the date and what to do. Unsubscribe any time. Work email How did you hear about us? How did you hear about us? 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