Messages API now reports usage.output_tokens_details.thinking_tokens for billed output tokens used as extended thinking.

Billing audits can isolate extended thinking because the response separates thinking tokens inside billed output tokens.

For streaming builds, the token breakdown arrives only on the final message_delta event and needs no beta header.

• Jul 23, 2026OpenAI pricing diff removes Business and Enterprise plan details.
• Jul 23, 2026Anthropic model card now lists Claude Fable 5 and Mythos 5 availability.
• Jul 23, 2026Anthropic pricing removed its team plan recommendation quiz from the monitored page.

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