Anthropic DNS Activity Reveals New STT Service, API RC2, and Tunnel Infrastructure

DNS monitoring of Anthropic's public subdomains has revealed several new records indicating upcoming services and infrastructure changes. These findings come from a Reddit user running a tool that watches AI company domains for updates.

Key DNS Records Discovered

• stt-flux.titanium.api.anthropic.com: This subdomain suggests a new speech-to-text (STT) service, likely built on an internal platform codenamed "Titanium."
• api-release-candidate-2: The presence of a second release candidate indicates an API update is in its final testing phases and could be released soon.
• *.tunnel.anthropic.com: A new tunnel infrastructure domain has appeared, which typically points to services for secure, proxied connections, possibly for internal tools or new API endpoints.
• mcp-proxy-staging: This record points to a Model Context Protocol (MCP) proxy service currently in a staging environment, used for testing before production deployment.

These are all public DNS records, meaning the services are likely being prepared for external access or are in active development. For developers using or building on Anthropic's APIs, this signals that new capabilities—particularly around speech-to-text and potentially new connection methods—are on the horizon.