Messages API responses now report how many billed output tokens were extended thinking.

Billed thinking is now a separate usage detail, so builders can inspect reasoning spend directly.

For streaming builds, the breakdown arrives on the final message_delta event and works without a beta header.

• 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.
• Jul 25, 2026Anthropic removed modelcard language for Claude Fable 5 and Claude Mythos 5.

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