Claude Sonnet 5 launch
Claude Sonnet 5 launch with improvements in reasoning, tool use, coding, and knowledge work
Anthropic changelog: June 2026
9 releases from to
Everything Anthropic shipped in June 2026, collected from official Anthropic sources. Each entry is dated and links to the page it came from.
June 2026 at a glance
June 2026 was Anthropic's 5th busiest month of the 12 months to then: 9 releases, close to its monthly average of 6. That was 3 releases fewer than May 2026. Most were Product (3), followed by API (2) and Enterprise & Security (2).
Releases
9
-3 vs May 2026
Rank of 12 months
5th
Average 6.1 a month
Most shipped
Product
3 releases
Notable Anthropic launches in June 2026
- Model
Claude Sonnet 5 launch
Claude Sonnet 5 launch with improvements in reasoning, tool use, coding, and knowledge work
Source: Claude Help Center Release Notes - Model
Claude Fable 5 launch
Claude Fable 5 launch as a Mythos-class model safe for general use
Source: Claude Help Center Release Notes - Product
Delegate work to Claude in Slack
Team and Enterprise plans can tag Claude directly in Slack conversations to delegate tasks
Source: Claude Help Center Release Notes
All Anthropic releases in June 2026
Newest first. Each entry links to the official page it came from.
June 20269 releases
Raised rate limits across the Claude API
We've raised rate limits across the Claude API. Claude Sonnet and Claude Haiku rate limits now match Claude Opus at every usage tier, and usage tiers have been consolidated into three: Start, Build, and Scale. Most organizations move to a higher tier, no organization receives lo…
Enable Trusted Devices for Remote Control
Admins for Team and Enterprise plans can require device verification for remote Claude Code sessions
Delegate work to Claude in Slack
Team and Enterprise plans can tag Claude directly in Slack conversations to delegate tasks
Edit Claude’s drafts in place
Edit Claude’s drafts in place When Claude writes a draft in chat or Claude Cowork (a report, a plan, a brief), it opens right beside your chat. Highlight the part you want changed, type the change, and Claude makes the edit right where you marked it. No switching apps, no re-des…
Edit Claude’s drafts in place
When Claude writes a draft in chat or Claude Cowork (a report, a plan, a brief), it opens right beside your chat. Highlight the part you want changed, type the change, and Claude makes the edit right where you marked it. No switching apps, no re-describing paragraphs in chat.
Claude Fable 5 launch
Claude Fable 5 launch as a Mythos-class model safe for general use
Enterprise plans can manage admin permissions with custom roles
Enterprise plans can manage admin permissions with custom roles
Advisor tool output cap and refusal billing change
The advisor tool now supports a max_tokens parameter to cap advisor output per call. On the Claude API, requests that return a refusal before any output is generated are no longer billed.
Where June 2026 sits
Anthropic releases per month, for June 2026 and the 11 months before it. A taller bar means more releases that month; the dated entries for each month are on its own page.
Other companies in June 2026
13 of the companies we track shipped in June 2026; Anthropic ranks 3rd by number of releases.
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