Revision History

Correction: Claude for Legal's Law Student plugin is one of the 12 launch plugins, not a separate one; CoCounsel rebuild dated to February 2026; link Claude for Legal

Correction: fixed Cowork's launch date (January 12, 2026), and updated stale computer-use platform and Dispatch availability statements to Anthropic's October 2026 help center

Correction: removed an outdated $6/$22.50 long-context surcharge for Sonnet 4.6 (standard pricing across 1M since March 13, 2026); update: Haiku 5.5 details and pricing, Sonnet 5.5 cache-read cut, Cowork/chat merge, Claude Design/Docs/Slides, Claude Duet, October 2026 app refresh

Improve internal links (2026-10-13)

Added Haiku 5.5 release and model link

Verification fixes: OSWorld label history; Sonnet 5.5 sentence attribution; Sonnet 5 no longer the current free-plan default

Correction: Opus 5.5 OSWorld label (2.1, called 2.0 in the system card); add Claude Sonnet 5.5 (Sep 28, 2026) to lead, release table, milestones, platforms and pricing; link FrontierCode

Correction: Opus 4.8 is no longer the newest Opus nor the top Opus SWE-bench Verified score; fast-mode availability updated to current pricing docs (Opus 4.7 fast mode now errors, Opus 4.6 runs at standard rates). Also: tense and count fixes, Terminal-Bench effort note

Correction: Sonnet 5 $2/$10 became the standard price (the $3/$15 increase was cancelled). Also: add Claude Opus 5, Fable 5.1/Mythos 5.1 and Opus 5.5 to timeline, milestones, platforms and pricing

Added the September 2026 Fermat's Last Theorem formalization result to the Research Context section with two new references

Corrected the staged text-watermark rollout, sampling-based method, pending detector access, and separate file-provenance metadata.

Correction: copy-paste persistence comes from the watermark being part of the text; model-level application means presence across products

Add August 10, 2026 research result: unreleased Claude raised the Riemann zeta critical-line zero bound from 41.6% to 67.2%; Add Content Marking section: Anthropic's EU AI Act Article 50(2) commitments to watermark Claude text and attach C2PA metadata (Aug 2026)

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Correction: repaired broken image URLs

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Added 6 contextual internal links

Add links to related AI Wiki tools

Enhancement: recency + accuracy pass (top-linked core page)

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Pre-update snapshot before enhancement to 12019 words.

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Remove MediaWiki Template: tags

Image migration: old MediaWiki URLs replaced with Vercel Blob URLs

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Initial import from MediaWiki