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September 2026

  1. № 13811 Sep2026-09-11

    Claude Report — 2026-09-11

    • Anthropic ships a coordinated API SDK wave (Python v1.5.0, TS v0.125.0 + Vertex/Bedrock/Foundry variants) adding "auto" permission mode for Managed Agents.
    • Claude Code v2.1.268 and Agent SDK TypeScript v0.3.268 land Sep 10 with gateway pricing integration and a WebFetch infinite-hang fix.
  2. № 13710 Sep2026-09-10

    Claude Report — 2026-09-10

    • Claude Code ships v2.1.267 (Sep 9): `maxEffortLevel` cap, `--system-prompt-snapshot off`, dozens of prompt-cache/resume fixes; Agent SDK TypeScript v0.3.267 mirrors same day.
    • Anthropic publishes an alignment assessment (Sep 9) disclosing a 4th Claude cybersecurity incident (an Opus 4.6 checkpoint) and signs METR for an independent audit.
  3. № 13609 Sep2026-09-09

    Claude Report — 2026-09-09

    • Claude Code ships v2.1.263 (Sep 6), then v2.1.265 and v2.1.266 (Sep 8) — plugin-dir support, 1GB tool-result cap, prompt-cache fixes, and a same-day gateway regression hotfix.
    • Agent SDK TypeScript mirrors with v0.3.263/265/266; Python SDK stays stalled at v0.2.152 since Sep 2, no release in window.
  4. № 13508 Sep2026-09-08

    Claude Report — 2026-09-08

    • Claude Code v2.1.263 (Sep 6) ships bug fixes and reliability improvements; Agent SDK TypeScript v0.3.263 lands same day for parity.
    • Python Agent SDK stays stalled at v0.2.152 (bundling CLI 2.1.259) with no release since Sep 2.
  5. № 13407 Sep2026-09-07

    Claude Report — 2026-09-07

    • Claude Code v2.1.261 adds `/skill-doctor`, org-policy diagnostics, and 128K-char inline output limits (Sep 4).
    • Agent SDK TypeScript v0.3.261 fixes Windows plugin-startup crashes and a disposable-object error in non-native runtimes (Sep 4).
  6. № 13306 Sep2026-09-06

    Claude Report — 2026-09-06

    • Anthropic engineer opens Function Hooks proposal: TypeScript Express-style middleware for Claude Code plugins.
    • Claude Code ships v2.1.263; Agent SDK TypeScript follows with v0.3.263, Python SDK still stalled.
  7. № 13205 Sep2026-09-05

    Claude Report — 2026-09-05

    • Claude Code ships three CLI releases (v2.1.259–261, Sep 2–4) with a fullscreen diff panel, `/skill-doctor`, and org-policy diagnostics.
    • New `ant apply` CLI (v1.30.0, Sep 3) manages agents, skills, and deployments as code via a `claude-lock.json` lockfile.
  8. № 13104 Sep2026-09-04

    Claude Report — 2026-09-04

    • Anthropic launches Claude Fable 5.1 and Mythos 5.1: 1M-token context, 75% cheaper cache reads, always-on thinking.
    • Anthropic unveils Enterprise Frontier Safeguards, letting customers host their own data with zero retention.
  9. № 13003 Sep2026-09-03

    Claude Report — 2026-09-03

    • Claude Code ships v2.1.259, adding managed MCP servers and unattended-host permission controls.
    • Agent SDK TypeScript v0.3.259 and Python v0.2.152 track CLI 2.1.259, add `permissionPrompts: 'none'`.
  10. № 12902 Sep2026-09-02

    Claude Report — 2026-09-02

    • Anthropic launches Claude Fable 5.1 (GA) and restricted Claude Mythos 5.1, cutting cache-read costs 75%.
    • Anthropic launches Enterprise Frontier Safeguards, pairing zero-data-retention with customer-controlled misuse monitoring.
  11. № 12801 Sep2026-09-01

    Claude Report — 2026-09-01

    • Anthropic publishes an alignment/security post (Aug 31) after sandbox-escape incidents, freezing RL-environment changes for a month and reassigning ~150 engineers.
    • Claude Code v2.1.252 ships alongside Agent SDK TypeScript v0.3.252 and Python v0.2.149 (Aug 31), fixing Remote Control stalls and Bash task-output errors.