Week 22 · May 25–29, 2026 changedwhats-new/2026-w22
Nearest release: v2.1.285, published under an hour after upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 29 Sep 2026 16:35 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 22 Oct 2026 18:07 UTC.
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33> Run Claude Code on Claude Opus 4.8, orchestrate large tasks with dynamic workflows, catch security issues with the security-guidance plugin, and use fast mode on Opus 4.8 at a lower price.
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5Releases [v2.1.150 → v2.1.157](/docs/en/changelog#2-1-150)
5Releases [v2.1.150 → v2.1.157](/docs/en/changelog.md#2-1-150)
664 features · May 25–29
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88Claude Opus 4.8
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1818/model claude-opus-4-8
1919```
2020
21[Model configuration](/docs/en/model-config#available-models)
21[Model configuration](/docs/en/model-config.md#available-models)
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2323Dynamic workflows
2424research preview
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3333create a workflow that migrates every internal fetch() call to the new HttpClient wrapper
3434```
3535
36[Dynamic workflows](/docs/en/workflows)
36[Dynamic workflows](/docs/en/workflows.md)
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3838Security guidance plugin
3939plugin
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5454/reload-plugins
5555```
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57[Security guidance plugin](/docs/en/security-guidance)
57[Security guidance plugin](/docs/en/security-guidance.md)
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5959Fast mode on Opus 4.8
6060research preview
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6767/fast
6868```
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70[Fast mode pricing](/docs/en/fast-mode#understand-the-cost-tradeoff)
70[Fast mode pricing](/docs/en/fast-mode.md#understand-the-cost-tradeoff)
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7272Other wins
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7474In `claude agents`, prefix a shell command with `!` to run it as a background job you can attach to and detach from; also available as `claude --bg --exec 'pytest -x'`Plugins in `.claude/skills` directories are now loaded automatically, no marketplace required, and `claude plugin init <name>` scaffolds a new pluginNew `/reload-skills` command re-scans skill directories without restarting, and `SessionStart` hooks can return `reloadSkills: true` to make skills they install available in the same sessionSkills and commands can set `disallowed-tools` in frontmatter to remove tools from the model while the skill is activeNew `MessageDisplay` hook event lets hooks transform or hide assistant message text as it is displayedClaude Code now switches to your configured `--fallback-model` for the rest of the session when the primary model is not found, instead of failing every requestPlugins can declare `defaultEnabled: false` in `plugin.json` or a marketplace entry, so they install without turning on until you enable themVim mode: `/` in NORMAL mode opens reverse history search, matching Bash and Zsh vi-modeStreaming tool execution is now always enabled, including with telemetry disabled and on Amazon Bedrock, Google Cloud's Agent Platform, and Microsoft Foundry`←←` to open the agents view now works on Amazon Bedrock, Google Cloud's Agent Platform, Microsoft Foundry, and with telemetry disabledClaude in Chrome: pick which connected browser to use via `/chrome` → "Select browser…", or in-chat when a browser action runs with multiple connected`claude mcp list` and `claude mcp get` now show unapproved `.mcp.json` servers as pending approval instead of auto-approving and connecting when output is piped
7575
76[Full changelog for v2.1.150–v2.1.157 →](/docs/en/changelog#2-1-150)
76[Full changelog for v2.1.150–v2.1.157 →](/docs/en/changelog.md#2-1-150)
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