# Claude Platform Claude Platform release notes — June 29, 2026

- Product: Claude Platform (https://whatsnew.fyi/product/claude-platform)
- Vendor: Anthropic
- Date: 2026-06-29
- Original notes: https://platform.claude.com/docs/en/release-notes/overview#june-29-2026
- Permalink: https://whatsnew.fyi/product/claude-platform/releases/2026-06-29-claude-platform-release-notes-june-29-2026

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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We've removed fast mode for Claude Opus 4.6. Requests to claude-opus-4-6 with speed: "fast" no longer run at fast speed or premium pricing: they run at standard speed, are billed at standard rates, an…

- **removed** — Fast mode for Claude Opus 4.6 has been removed, and requests with speed set to 'fast' now run at standard speed and are billed at standard rates instead