The handbookHowUseClaude/Official changelog
THE OFFICIAL TIMELINE

What changed. What to try next.

Selected official announcements, ordered by the date they were published. Each record links to its source and an affected guide.

Selected official updates with source dates and tutorial impact. Official sources are checked every six hours; changes enter editorial review before publication in all three languages. This is not a complete release archive.

Sources reviewed:

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14 official records
  1. Official publication date
    Claude Code

    Code Review reaches general availability

    The hosted review product leaves research preview, with repository-level review depth controls.

    Availability & conditions
    Team and Enterprise; an administrator enables it and installs the GitHub App. This is separate from asking a local Code session to review a diff.
    In this handbook
    Keep human review and acceptance checks; distinguish local review from the hosted product.
    Official source ↗Claude announcement · October 15
    Put it into practicePlan, edit, test, and review a change →

    Added to this handbook: · Sources reviewed: Oct 18, 2026

  2. Official publication date
    API & platform

    Opus 5.5 fast mode leaves preview

    The API no longer requires the fast-mode beta header for Opus 5.5.

    Availability & conditions
    Applies to Opus 5.5. Fast mode on Opus 5 and 4.8 remains preview with its beta header.
    In this handbook
    Check model-specific options instead of reusing old beta headers blindly.
    Official source ↗Claude Platform release notes · October 15
    Put it into practiceMake your first Claude API request →Handle failures, usage, and retries →

    Added to this handbook: · Sources reviewed: Oct 18, 2026

  3. Official publication date
    API & platform

    OpenTelemetry export enters beta

    The platform adds tracing export for Messages requests, Managed Agents, and SDKs.

    Availability & conditions
    Beta; configure a destination in the Console and follow the tracing documentation.
    In this handbook
    Retain request IDs and safe diagnostics in basic examples; add tracing when operating a service.
    Official source ↗Claude Platform release notes · October 14
    Put it into practiceHandle failures, usage, and retries →

    Added to this handbook: · Sources reviewed: Oct 18, 2026

  4. Official publication date
    Desktop appClaude Code

    Docs, Slides, and Design leave beta

    Core artifact templates become generally available; Dashboards and Motion launch in beta.

    Availability & conditions
    Core templates include Free. Dashboards: paid plans; Motion: Team and Enterprise. Organization controls apply.
    In this handbook
    Use current template and export controls; do not describe legacy artifacts as the only workflow.
    Official source ↗Claude announcement · October 8
    Put it into practiceCreate, edit, and export useful deliverables →

    Added to this handbook: · Sources reviewed: Oct 18, 2026

  5. Official publication date
    Claude modelsAPI & platform

    Claude Haiku 5.5 launches

    A new Haiku model arrives with updated API behavior and migration guidance.

    Availability & conditions
    Check model access and provider-specific support. Some older thinking and sampling parameters return 400.
    In this handbook
    Select accessible model IDs and inspect non-text content and stop reasons.
    Official source ↗Claude Platform release notes · October 7
    Put it into practiceMake your first Claude API request →Handle failures, usage, and retries →

    Added to this handbook: · Sources reviewed: Oct 18, 2026

  6. Official publication date
    API & platformDesktop app

    Monthly API credits for Max and Team

    The announcement adds claimable platform credits linked to a Console organization.

    Availability & conditions
    Rolling out over several days; claim through the applicable billing settings. Check your actual entitlement.
    In this handbook
    Desktop sign-in is not API configuration; check Console access and credits first.
    Official source ↗Claude release notes · October 7
    Put it into practiceMake your first Claude API request →

    Added to this handbook: · Sources reviewed: Oct 18, 2026

  7. Official publication date
    API & platform

    Models API reports server-tool capabilities

    Model records add capability information for web search and code execution tools.

    Availability & conditions
    Use capabilities.server_tools; it differs from the top-level code_execution capability.
    In this handbook
    Check capabilities before adding server tools; custom client tools still run in your code.
    Official source ↗Claude Platform release notes · October 6
    Put it into practiceLet Claude call an external API →

    Added to this handbook: · Sources reviewed: Oct 18, 2026

  8. Official publication date
    API & platformClaude models

    Sonnet 4.5 API retirement announced

    The platform announces a November 30, 2026 retirement date for Sonnet 4.5 on the Claude API.

    Availability & conditions
    An announced future retirement at this snapshot, not a claim it is already unavailable.
    In this handbook
    Keep model selection configurable and consult the migration guide.
    Official source ↗Claude Platform release notes · September 30
    Put it into practiceMake your first Claude API request →

    Added to this handbook: · Sources reviewed: Oct 18, 2026

  9. Official publication date
    API & platformClaude models

    Claude Sonnet 5.5 launches

    A new Sonnet model arrives with model-specific migration requirements.

    Availability & conditions
    Some thinking, forced-tool, and computer-use settings from earlier models are incompatible.
    In this handbook
    The examples omit optional sampling and forced-tool settings and use normal tool selection.
    Official source ↗Claude Platform release notes · September 28
    Put it into practiceMake your first Claude API request →Let Claude call an external API →

    Added to this handbook: · Sources reviewed: Oct 18, 2026

  10. Official publication date
    Desktop app

    Chat and Cowork begin merging

    A unified conversation experience begins rolling out.

    Availability & conditions
    Starting with Pro and Max. Some accounts retain separate options during rollout; local work requires Desktop open.
    In this handbook
    The desktop guide describes both interfaces instead of assuming every account has migrated.
    Official source ↗Claude Help Center · September 16
    Put it into practiceInstall Claude Desktop and find your way around →Run a folder task or a coding session →

    Added to this handbook: · Sources reviewed: Oct 18, 2026

  11. Official publication date
    Claude CodeDesktop app

    Claude Code desktop redesign

    The redesigned app adds a multi-session sidebar, movable panes, terminal, and file editor.

    Availability & conditions
    The announcement covers eligible Code users; available interfaces and organization settings still matter.
    In this handbook
    Choose the correct project and environment, then review diffs and checks in the session.
    Official source ↗Claude announcement · April 14
    Put it into practiceRun a folder task or a coding session →Plan, edit, test, and review a change →

    Added to this handbook: · Sources reviewed: Oct 18, 2026

  12. Official publication date
    Desktop app

    Cowork becomes generally available

    Cowork reaches general availability on macOS and Windows desktop.

    Availability & conditions
    Historical announcement. The later unified-conversation rollout changes how some accounts enter these tasks.
    In this handbook
    Use the current desktop instructions and note rollout differences.
    Official source ↗Claude release notes · April 9
    Put it into practiceRun a folder task or a coding session →

    Added to this handbook: · Sources reviewed: Oct 18, 2026

  13. Official publication date
    Claude Code

    Code access added to Team Standard seats

    The release note adds Claude Code access to each Team standard seat.

    Availability & conditions
    Team plan announcement; organization policy and current seat settings still apply.
    In this handbook
    Confirm the active organization before troubleshooting a missing Code entry.
    Official source ↗Claude release notes · January 16
    Put it into practiceInstall Claude Code and sign in →

    Added to this handbook: · Sources reviewed: Oct 18, 2026

  14. Official publication date
    Desktop app

    Cowork research preview begins

    The original preview introduces agentic knowledge work in Claude Desktop.

    Availability & conditions
    At launch: Max on macOS only. This is historical, not the current availability matrix.
    In this handbook
    Do not reuse the initial macOS-only restriction as current guidance.
    Official source ↗Claude release notes · January 12
    Put it into practiceInstall Claude Desktop and find your way around →

    Added to this handbook: · Sources reviewed: Oct 18, 2026

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