Claude Managed Agents on Claude Platform on AWS
Claude Managed Agents webhooks, multiagent orchestration and self-hosted sandboxes are now available on Claude Platform on AWS.
Anthropic changelog: May 2026
12 releases from to
Everything Anthropic shipped in May 2026, collected from official Anthropic sources. Each entry is dated and links to the page it came from.
May 2026 at a glance
May 2026 was Anthropic's busiest month of the 12 months to then: 12 releases, about 2.3× its monthly average of 5. That was the same number as in April 2026. Releases were spread across API (3), Developer Tools (3) and Infrastructure (3).
Releases
12
+0 vs April 2026
Rank of 12 months
1st
Average 5.3 a month
Most shipped
API
3 releases
Notable Anthropic launches in May 2026
- Model
Claude Opus 4.8 launch
Claude Opus 4.8 upgrade with improvements in coding, agentic skills, and practical knowledge work
Source: Claude Help Center Release Notes - API
Thinking token breakdown in Messages API usage
The Messages API response now includes usage.output_tokens_details.thinking_tokens, reporting how many billed output tokens were extended thinking. No beta header is required.
Source: Claude Platform Release Notes - API
Cache Diagnostics Beta Launch
We've launched cache diagnostics in public beta. Pass diagnostics.previous_message_id on a Messages request and the API reports a cache_miss_reason explaining where the prompt cache prefix diverged from the previous turn. Include the cache-diagnosis-2026-04-07 beta header in you…
Source: Claude Platform Release Notes
All Anthropic releases in May 2026
Newest first. Each entry links to the official page it came from.
May 202612 releases
Claude Opus 4.8 launch
Claude Opus 4.8 upgrade with improvements in coding, agentic skills, and practical knowledge work
Thinking token breakdown in Messages API usage
The Messages API response now includes usage.output_tokens_details.thinking_tokens, reporting how many billed output tokens were extended thinking. No beta header is required.
Enterprise plans can manage connector access with custom roles
We added connector permissions to extend the existing custom roles framework and allow administrators to control which connectors, and which individual tools on those connectors, are available to each custom role.
Claude now works with more security and compliance tools
Claude Compliance API integrations with security and compliance tools
MCP Tunnels and Self-Hosted Sandboxes for Managed Agents
MCP tunnels is now available as a research preview, so you can connect to MCP servers in your private network. Self-hosted sandboxes are now available for Claude Managed Agents, as an alternative to running tool execution in Anthropic's infrastructure. See Self-hosted sandboxes.…
Enhanced Web Search Tool for SEC Filings
The web search tool now returns richer SEC filing data, making it easier to ground financial research agents, earnings analysis, and due-diligence workflows in primary sources with citations.
Cache Diagnostics Beta Launch
We've launched cache diagnostics in public beta. Pass diagnostics.previous_message_id on a Messages request and the API reports a cache_miss_reason explaining where the prompt cache prefix diverged from the previous turn. Include the cache-diagnosis-2026-04-07 beta header in you…
Fast Mode Support for Claude Opus 4.7
Fast mode (research preview) now supports Claude Opus 4.7. Set speed: "fast" with model: "claude-opus-4-7" and the fast-mode-2026-02-01 beta header for significantly faster output token generation at premium pricing. Pricing, rate limits, and access are the same as for Opus 4.6…
Claude Platform on AWS Launch
We've launched Claude Platform on AWS, bringing the Claude API to Anthropic-managed infrastructure accessible through AWS, with AWS billing and IAM authentication. Access the full Messages API, Files API, Message Batches API, Claude Managed Agents, Agent Skills, code execution,…
Multiagent Orchestration and Managed Agents Enhancements
Multiagent orchestration and Outcomes are now in public beta under the standard managed-agents-2026-04-01 beta header. Claude Managed Agents vault credential background refresh is now supported for mcp_oauth credentials. See Authenticate with vaults. Webhooks for Claude Managed…
Workload Identity Federation Launch
Authenticated workloads to the Claude API with short-lived OIDC tokens from your own identity provider.
Where May 2026 sits
Anthropic releases per month, for May 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 May 2026
14 of the companies we track shipped in May 2026; Anthropic ranks 3rd by number of releases.
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