CLAUDE·news
PTEN

archive

Latest editions

181 editions

September 2026

  1. № 15730 Sep2026-09-30

    Claude Report — 2026-09-30

    • <a href="https://github.com/anthropics/claude-code/releases/tag/v2.1.285">Claude Code v2.1.285</a> ships Sep 29 with `claude --desktop`, `claude plugin configure`, and `allowedProviders` managed setting.
    • Both Agent SDKs (<a href="https://github.com/anthropics/claude-agent-sdk-python/releases">Python 0.2.162</a>, <a href="https://github.com/anthropics/claude-agent-sdk-typescript/releases">TypeScript 0.3.285</a>) sync same-day for CLI parity; TS SDK adds Artifact and startup-failure fields.
  2. № 15629 Sep2026-09-29

    Claude Report — 2026-09-29

    • Anthropic ships Claude Sonnet 5.5 — faster, cheaper, ~30% lower effective cost (Sep 28).
    • Claude Code v2.1.284, both Agent SDKs, and five+ Anthropic SDKs/tools sync same day for Sonnet 5.5 (Sep 28).
  3. № 15528 Sep2026-09-28

    Claude Report — 2026-09-28

    • Anthropic opens a public Plugin Directory submission portal, confirms MCP 2.0 plus Apps/Enterprise Managed Auth extensions (Sep 25).
    • Claude Code v2.1.283 adds model allowlist/denylist controls and a `/doctor prompt-audit` command; both Agent SDKs sync same day (Sep 25).
  4. № 15427 Sep2026-09-27

    Claude Report — 2026-09-27

    • Opus 5.5 gets a coding-focused update: 20% cheaper tokens, 60% cheaper cache reads, ~30% faster output (Sep 24).
    • Claude Tag adds personal connectors inside shared Slack channels, rolling out on Team plans (Sep 24).
  5. № 15326 Sep2026-09-26

    Claude Report — 2026-09-26

    • Anthropic launches the <a href="https://claude.com/blog/claude-marketplace">Claude Marketplace</a> (Sep 23), unifying 2,000+ connectors/plugins, agent products, and consulting partners in one hub.
    • A new <a href="https://claude.com/blog/build-plugins-for-claude">directory submission portal</a> (Sep 25) lets developers publish MCP connectors and plugin bundles with auto-validation and analytics.
  6. № 15225 Sep2026-09-25

    Claude Report — 2026-09-25

    • Claude Code v2.1.282 (Sep 24) adds `maxProseWidth`, telemetry-visibility notices, and dozens of fixes across resumed sessions, VS Code, and Claude Tag.
    • Claude Agent SDK TypeScript v0.3.282 ships same-day parity with marketplace allow/blocklists and an alpha `prewarm()` API.
  7. № 15124 Sep2026-09-24

    Claude Report — 2026-09-24

    • Anthropic publishes Claude Code v2.1.281 (Sep 23) with Claude Desktop gateway controls and MCP validation checks.
    • Claude Agent SDK (TS v0.3.281, Python v0.2.159) and CLI stay in lockstep, shipping same-day parity with v2.1.281.
  8. № 15023 Sep2026-09-23

    Claude Report — 2026-09-23

    • Anthropic ships Claude Opus 5.5 — 20% cheaper, 30% faster, 1M context, now the default in Claude Code v2.1.280.
    • All four official SDKs (Agent SDK Python/TS, Anthropic SDK Python/TS) ship same-day parity releases with inline tool definitions and MCP tool-list pinning.
  9. № 14922 Sep2026-09-22

    Claude Report — 2026-09-22

    • Anthropic ships no new official Claude Code/API/model news in the Sep 19–22 window — a quiet post-weekend stretch.
    • MCP ecosystem stays busiest: chrome-devtools-mcp finishes its "SDK v2" migration, serena ships a dozen language-backend fixes.
  10. № 14821 Sep2026-09-21

    Claude Report — 2026-09-21

    • Claude Code ships two releases in two days: v2.1.277 adds AGENTS.md support, v2.1.278 defaults auto mode to server-side classifier billing.
    • Anthropic and Accenture each commit $1B+ over five years to embed independent evaluators inside Anthropic, per Dario Amodei's "pace the frontier" pledge.
  11. № 14720 Sep2026-09-20

    Claude Report — 2026-09-20

    • Anthropic launches a redesigned Claude Code Projects beta: a coordinator runs parallel cloud-session threads over shared memory and a project library.
    • Claude Code ships four releases in three days (v2.1.275→v2.1.278): claude.ai skill/plugin sync, a same-day regression hotfix, AGENTS.md support, and server-side auto-mode billing.
  12. № 14619 Sep2026-09-19

    Claude Report — 2026-09-19

    • Claude Code ships v2.1.277 (AGENTS.md fallback support, prompt-injection framing fix) and v2.1.278 (server-side auto-mode classifier) within 24 hours.
    • Anthropic and Accenture each commit at least $1B over five years to embed independent AI evaluators with employee-level access inside Anthropic.
  13. № 14518 Sep2026-09-18

    Claude Report — 2026-09-18

    • Claude Code ships five releases in four days (v2.1.272→v2.1.276): claude.ai skill/plugin sync, npm-plugin supply-chain hardening, a send-now key, and a Sep 18 hotfix for gateway users.
    • Both agent SDKs sync same-day to each release; the Python SDK adds a `snapshot` option that freezes the system prompt for better prompt-cache hits across resumed sessions.
  14. № 14417 Sep2026-09-17

    Claude Report — 2026-09-17

    • Claude Code ships v2.1.274 (Sep 17, critical-memory warnings, MCP/session fixes) and v2.1.271 (Sep 14, Remote fast mode).
    • Both agent SDKs bump same day (TS v0.3.274, Python v0.2.154, Sep 17), syncing to CLI 2.1.274.
  15. № 14316 Sep2026-09-16

    Claude Report — 2026-09-16

    • Claude Code ships v2.1.273 (LLM gateway headers, MCP disconnect notifications, remote-control session forking).
    • Full SDK family bumps same day: anthropic-sdk-typescript v0.126.0, anthropic-sdk-python v1.6.0, both agent SDKs — all adding beta on-demand conversation compaction.
  16. № 14215 Sep2026-09-15

    Claude Report — 2026-09-15

    • Claude Code ships v2.1.271 (fast mode in Remote sessions, sandboxed per-command domain allowlists, `omitClaudeMd`) then v2.1.272 as a same-day-cadence reliability patch.
    • claude-agent-sdk-typescript catches up with three releases (v0.3.270→272) while claude-agent-sdk-python stays frozen at v0.2.152 — now 13 days stale.
  17. № 14114 Sep2026-09-14

    Claude Report — 2026-09-14

    • Claude Code v2.1.269 ships plugin eval, remote-session output styles, and a 256-agent concurrency cap — then v2.1.270 patches a regression it introduced.
    • claude-agent-sdk-python stays frozen at v0.2.152, now 12 days stale while Claude Code has shipped two more releases.
  18. № 14013 Sep2026-09-13

    Claude Report — 2026-09-13

    • Anthropic publishes a September threat-intel report: Claude misused for autonomous drone-targeting software, near-bioweapons-threshold research, and state-linked cyber ops.
    • Claude Code v2.1.270 and Agent SDK TS v0.3.270 ship Sep 12, fixing a Bash regression that re-asked permission for read-only git commands.
  19. № 13912 Sep2026-09-12

    Claude Report — 2026-09-12

    • Claude Code v2.1.269 and Agent SDK TS v0.3.269 ship Sep 11 with a `claude plugin eval` CLI.
    • anthropic-sdk-ruby v1.70.0 surfaces as a missed Sep 10 parity release across the SDK family.
  20. № 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.
  21. № 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.
  22. № 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.
  23. № 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.
  24. № 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).
  25. № 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.
  26. № 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.
  27. № 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.
  28. № 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'`.
  29. № 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.
  30. № 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.