Anthropic launched cache diagnostics in public beta for Messages requests using diagnostics.previous_message_id.

Builders can see where a prompt cache prefix diverged instead of treating cache misses as opaque.

It sits inside Messages requests: pass diagnostics.previous_message_id and the beta header to get cache_miss_reason.

• Jul 27, 2026Frontier vendors expanded runtime surfaces while removing public plan and model-routing signals.
• Jul 26, 2026OpenAI updated GPT-5.5 Instant to improve conversational quality in decision, advice, planning, research, and shopping tasks.
• Jul 25, 2026Enterprise and Edu users can find skills under Plugins, on the Skills tab in the Plugin Directory.

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