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Using Claude

Claude docs changelog

We periodically re-check Anthropic's official docs and record every case where a fact our guides relied on has changed — with the date, previous value, current value and source. This is our own verified log, not Anthropic's official change history.

13 entries · How we verify (editorial principles)

September 9, 2026

  • Claude app

    Voice mode availability

    Before
    Two-way voice conversation limited
    Now
    Two-way voice mode on mobile, desktop and web, all plans. Non-English in beta; counts toward usage limits
    Official source ↗Related guide
  • Claude app

    Chat file upload limits

    Before
    30MB per file
    Now
    500MB per file, up to 20 files, PDFs up to 1,000 pages (visual analysis up to 100). Project files remain 30MB
    Official source ↗Related guide
  • Claude app

    Artifacts Remix button

    Before
    Signed-in users can Remix into an editable copy
    Now
    Remix button removed. Copy the published artifact code into a new chat and ask for changes (Free, Pro, Max)
    Official source ↗Related guide
  • MCP

    MCP Python SDK 2.0 server class

    Before
    from mcp.server.fastmcp import FastMCP
    Now
    SDK 2.0 required; from mcp.server import MCPServer. uv add "mcp[cli]" installs 2.x
    Official source ↗Related guide
  • API

    Agent SDK subscription credit change

    Before
    From June 15, Agent SDK usage on subscription plans draws from a separate monthly credit
    Now
    Paused on June 15. Agent SDK, claude -p and third-party apps still draw from subscription limits; no credit
    Official source ↗Related guide
  • API

    Streaming fallback content block

    Now
    When a request is served by a different model, a fallback block (start/stop pair, no deltas) appears at each model boundary
    Official source ↗Related guide
  • API

    What a 429 means

    Before
    Rate limit exceeded; follow retry-after
    Now
    Also returned at the tier monthly spend cap, with no retry-after header (SDK auto-retries keep failing). A self-set spend limit returns 400
    Official source ↗Related guide
  • Models

    API model aliases

    Before
    One-word aliases like opus / sonnet resolve to the recommended version
    Now
    One-word names are Claude Code /model shortcuts. API aliases exist only for pre-4.6 models (claude-haiku-4-5 form); from 4.6 the dateless ID is the snapshot
    Official source ↗Related guide
  • API

    Previous-turn thinking blocks in context

    Before
    Stripped automatically by the API
    Now
    Kept by default on Opus 4.5+, Sonnet 4.6+ and Fable (count as input tokens); stripped only on older Opus/Sonnet and all Haiku
    Official source ↗Related guide
  • API

    Structured outputs generally available

    Before
    Beta header required, parameter output_format
    Now
    GA. No beta header; parameter is output_config.format. Python SDK 1.0+ raises TypeError if output_format is passed to beta create()
    Official source ↗Related guide
  • API

    How extended thinking is enabled

    Before
    type: enabled + budget_tokens
    Now
    Current models think by default. Manual mode is deprecated on 4.6 and rejected (400) on 4.7+; steer with type: adaptive + effort
    Official source ↗Related guide
  • Claude Code

    Node.js requirement for Claude Code install

    Before
    Node.js 18 or later required
    Now
    Native install needs no Node.js. Only npm installs (v2.1.198+) require Node 22+; lower versions print an EBADENGINE warning but still run
    Official source ↗Related guide

September 2, 2026

  • Pricing

    Claude Sonnet 5 API pricing

    Before
    Announced September increase ($3/$15)
    Now
    Increase withdrawn; $2/$10 confirmed as standard
    Official source ↗Related guide