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Anthropic @anthropics
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wire 2026-10-25
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$ the-wire · showcase

Cookbooks move to Opus 5.5, Sonnet 5.5 and Fable 5.1

By RepoJournal · Filed · About Anthropic · Composed from the cited sources · methodology

cj-ant
1 person shipped this
cj-ant @cj-ant 2 cited

The claude-cookbooks repo retargeted its notebooks, helper scripts and docs to claude-opus-5-5, claude-sonnet-5-5, claude-fable-5-1 and claude-haiku-4-5, and rewrote the patterns those models reject, so any code copied from the cookbooks now looks different from what you have in production.

Bump cookbook defaults to Opus 5.5, Sonnet 5.5 and Fable 5.1 anthropics/claude-cookbooks

by cj-ant

Beyond swapping model IDs, the bump removes non-default sampling parameters, budget_tokens thinking, assistant-prefill continuations, and response.content[0].text reads that break when a leading thinking block arrives. The two extended-thinking notebooks are rewritten around adaptive thinking and effort, so copied examples of tool_choice, JSON mode and sampling past max tokens no longer match w...

Bump cookbook defaults to Opus 5.5, Sonnet 5.5 and Fable 5.1 (#924) anthropics/claude-cookbooks

by CJ Avilla

The same change landed as a commit after merging, so the model ID defaults and the rewritten thinking notebooks are already in the repo's main line. If you have pinned a fork or vendored a notebook, diff it against these defaults before your next sync.

$ ls anthropics/reviews/ # the step-back reads

the week in review PHP SDK 1.5.0 ships typed exceptions; self-hosted sandboxes land the month in review Claude Code symlink TOCTOU allows arbitrary file write
Full archive → Weekly reviews →

Quick answers

What shipped in Anthropic on October 25, 2026?
The claude-cookbooks repo retargeted its notebooks, helper scripts and docs to claude-opus-5-5, claude-sonnet-5-5, claude-fable-5-1 and claude-haiku-4-5, and rewrote the patterns those models reject, so any code copied from the cookbooks now looks different from what you have in production. In total, 1 commits, 1 pull requests, and 1 releases landed.
Who contributed to Anthropic on October 25, 2026?
1 developer shipped this update, including cj-ant.
What were the notable Anthropic updates?
Bump cookbook defaults to Opus 5.5, Sonnet 5.5 and Fable 5.1 and Bump cookbook defaults to Opus 5.5, Sonnet 5.5 and Fable 5.1 (#924).
♥

$ log @anthropics --recent

Maintainers get to set the format of scanner reports and patches 8 shipped fasthttp joins the scanner roll 7 shipped Office skills go Apache 2.0, security-guidance ships 2.0.18 121 shipped Hardening security-guidance reviews, CLI 2.7.0, self-hosted sandboxes 69 shipped

$ log --all # elsewhere on the wire

Agent Security Quiet day in agent security as guard coverage reaches four clients Alignment & Post-training verl defaults Ascend RL mode, open-instruct unblocks SFT packing

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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