Claude's API now charges you for pre-output refusals
The catch: you're charged even when Claude declines. Cache diagnostics also exits beta, mid-convo tools land, and refusal internals hit HN's front page.
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You now pay when Claude refuses
As of Sept 24, pre-output refusals in the bio, frontier_llm and reasoning_extraction categories are billed at the running model's normal rates — so an Opus 5.5 refusal now costs the same $4/$20 per MTok as any other call. Mid-stream refusals were already billed; other refusal categories and fallback credit are unchanged, and the policy applies across the API and cloud providers.
Cache diagnostics graduates from beta
The cache-diagnosis-2026-04-07 header is gone: you can attach a diagnostics object straight to any Messages request, and every response now returns a diagnostics field (null unless you ask for it). That means you can debug prompt-cache hits and misses in production without flipping a beta flag.
Define tools mid-conversation
A new inline-tools-2026-09-15 beta lets you declare tool definitions inside mid-conversation system messages instead of only at the start of a request. Useful for agents that unlock new tools partway through a session without rebuilding the whole payload.
Refusal internals hit the HN front page
A writeup on 'dynamic abliteration' — steering a frozen model's residual stream at runtime with forward hooks rather than editing weights — climbed Hacker News, pitched as reversible and context-gated versus classic weight surgery. It's an interpretability read on how refusal behavior is encoded and how much of it lives outside the weights.
Claude Tag pulls your connectors into Slack
The Claude Tag beta now lets you use your own connected tools — calendar, drive, CRM — inside Slack channel requests, with review-before-post or auto-post modes and admin governance on Enterprise. Your @Claude ask in a channel can now reach your personal data sources, not just the workspace's.
OpenAI hands admins the ChatGPT Ads switch
ChatGPT Enterprise, EDU and Business admins get a redesigned External access page controlling whether ChatGPT Sites can use members' connected apps and whether apps can access ChatGPT Ads — both default off during preview. If you run a workspace, set these before Sites and ads reach your members.