Claudenotes Brief

Claudenotes Brief

Weekly Claude Code updates, Anthropic engineering, and AI news. About 6 minutes, every Monday. Subscribe on Apple Podcasts, Spotify, or wherever you listen to podcasts.

Episodes

2D AGO

Haiku 5.5 Arrives with a One Million Token Context Window

Claude Haiku five point five is now the default Haiku model on the Anthropic API, with a one million token context window and lower pricing. Cache reads on Sonnet five point five cost half as much, hooks can now block actions when they fail, and the Read tool can pull entire large files in one call. Plus, Anthropic's disclosure of agent misbehavior incidents and a sixty billion dollar chip financing package.

6:09

1W AGO

Sonnet 5.5 Becomes the Default, and Claude Mods Arrive

Claude Sonnet 5.5 is now the default Sonnet model with a one million token context window, and a new mods system lets plugins rewrite prompts and block risky commands. Sessions now start in auto mode by default, and Visual Studio Code picks up bookmarks and background execution. Plus: Anthropic's reported IPO timing, an FTC inquiry, and a one hundred million dollar training commitment.

6:44

2W AGO

Opus 5.5 Becomes the Default, Plus a Prompt Audit Command

Claude Opus 5.5 is now the default Opus model with a one million token context window and new pricing, and Pro and Team Standard plans shift their default from Sonnet to Opus. A new prompt audit checks your instruction files for outdated model patterns, and resumed sessions stop losing reasoning and prompt cache. Plus Anthropic's twelve billion dollar compute deal with Akamai and an Australian Senate inquiry.

6:35

3W AGO

AGENTS.md Support, Server-Side Auto Mode, and Skill Sync

Claude Code now reads AGENTS.md in projects without a CLAUDE.md, and auto mode's safety classifier moved server-side so you're no longer billed for its token overhead. Skills and plugins from your claude.ai account now sync to terminal sessions, npm plugin installs no longer run package scripts, and we cover Anthropic's IPO plans plus a Wall Street Journal report on Claude being used in an intrusion at OpenAI.

6:43

1MO AGO

Fable 5.1 Becomes the Default, Plus Live Diffs and Skill Diagnostics

Claude Fable 5.1 is now the default Fable model with a one million token context window and lower cache pricing. Claude Code adds a live diff panel, a skill diagnostics command, and headless automation controls. Plus Anthropic's alignment and security disclosures, simultaneous provider outages, and enterprise interest in open-weight models.

6:33

1MO AGO

Restricted Mode, a Larger Context Ceiling, and the Pentagon Ruling

Claude Code now offers a restricted mode that removes every tool capable of running commands or fetching remote content, making it practical to point Claude at an untrusted repository. Sonnet 5's one million token window pushes auto-compact later, hooks can gate model switches, and cost views add prompt-cache detail. Plus a federal ruling on the Pentagon's Anthropic ban and a forty-five billion dollar UK compute commitment.

6:33
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