Anthropic added URL source blocks for images and PDFs and a none option for tool choice parameters.

Direct URL referencing removes the latency and compute overhead of base64 encoding for large vision and document files.

This update simplifies API requests and allows developers to toggle tool access without modifying the underlying tool definitions.

• Jun 06, 2026Anthropic updated prompt caching to automatically read from the longest previously cached prefix when breakpoints are set.
• Jun 06, 2026Anthropic optimized prompt caching support in the Message Batches API to improve cache hit rates.
• Jun 06, 2026Anthropic added a delete endpoint to the Message Batches API for managing batch processing tasks.

This is the world we build in. It moves this fast. We move with it.