Anthropic's sitemap quietly published 421 new pages, including references to unannounced m

EXHIBIT 1105 · FLASH

Sep 1, 2026 20:21 UTC sitemap https://platform.claude.com/sitemap.xml

Anthropic's sitemap quietly published 421 new pages, including references to unannounced models like Fable 5, Mythos 5, Opus 4.5 through 4.8, Opus 5, Haiku 4.5, Sonnet 4.5, and Sonnet 5, along with their migration guides and release notes, predominantly in German.

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anthropic just quietly dropped a ton of new model names in their sitemap, including fable 5, mythos 5, and several new opus and sonnet versions. looks like some big updates are coming.

new anthropic models spotted! the sitemap has pages for opus 5, haiku 4.5, sonnet 5, and more, complete with migration guides. wonder when they'll officially announce these.

Anthropic docs sitemap (https://platform.claude.com/sitemap.xml): 421 new URLs, 0 removed [new pages] (421) + https://platform.claude.com/docs/de/models/fable-5-1/overview + https://platform.claude.com/docs/de/models/fable-5/introducing-claude-fable-5-and-claude-mythos-5 + https://platform.claude.com/docs/de/models/fable-5/overview + https://platform.claude.com/docs/de/models/haiku-4-5/migration-guide + https://platform.claude.com/docs/de/models/haiku-4-5/overview + https://platform.claude.com/docs/de/models/mythos-5-1/overview + https://platform.claude.com/docs/de/models/mythos-5/overview + https://platform.claude.com/docs/de/models/opus-4-5/overview + https://platform.claude.com/docs/de/models/opus-4-6/overview + https://platform.claude.com/docs/de/models/opus-4-7/overview + https://platform.claude.com/docs/de/models/opus-4-8/overview + https://platform.claude.com/docs/de/models/opus-5/migration-guide + https://platform.claude.com/docs/de/models/opus-5/overview + https://platform.claude.com/docs/de/models/opus-5/whats-new-opus-5 + https://platform.claude.com/docs/de/models/overview + https://platform.claude.com/docs/de/models/sonnet-4-5/overview + https://platform.claude.com/docs/de/models/sonnet-4-6/overview + https://platform.claude.com/docs/de/models/sonnet-5/migration-guide + https://platform.claude.com/docs/de/models/sonnet-5/overview + https://platform.claude.com/docs/de/models/sonnet-5/whats-new-sonnet-5 + https://platform.claude.com/docs/de/release-notes/system-prompts/claude-fable-5 + https://platform.claude.com/docs/de/release-notes/system-prompts/claude-haiku-3 + https://platform.claude.com/docs/de/release-notes/system-prompts/claude-haiku-3-5 + https://platform.claude.com/docs/de/release-notes/system-prompts/claude-haiku-4-5 + https://platform.claude.com/docs/de/release-notes/system-prompts/claude-opus-3 + https://platform.claude.com/docs/de/release-notes/system-prompts/claude-opus-4 + https://plat