AI Weekly Malaysia

Developers report that Anthropic's Claude API returns empty or truncated thinking blocks for Opus 4.8 and Sonnet 5 even when summarized thinking is explicitly requested, yet the underlying reasoning tokens are still billed in full as output tokens. Anthropic's own documentation confirms users are charged for all thinking tokens generated regardless of whether the thinking text is returned, and the issue may stem from display-summary testing rather than a broad outage.

Why: If you enable thinking on Claude Opus 4.8 or Sonnet 5, you may be paying for reasoning tokens you never see — so audit your token usage and consider lowering the thinking budget or disabling thinking entirely until the blank-block behavior is confirmed fixed. This directly affects your API cost per call.

OpenAI's ChatGPT Ads service has been serving ads and billing customers for up to a day after campaigns are paused, due to a defect where the ad-level serving status doesn't refresh when the campaign-level pause is triggered. A UK advertiser, Ed Bolton of Excel4Business, was charged £60.72 in invalid charges from the initial occurrence and ~£6.47 from a recurrence on August 4–5, with OpenAI support confirming the bug and processing refunds. OpenAI began testing ChatGPT ads in the US in February 2026 and expanded to the UK, Mexico, Brazil, Japan, and South Korea as of August 13.

Why: If you are running or considering ChatGPT Ads, monitor your billing closely after pausing campaigns—OpenAI's own support confirmed the pause doesn't reliably propagate to the ad-serving layer, and invalid charges may accrue for hours. Factor this into budget controls and don't assume a pause is instantaneous like on Google or Meta. This is early-stage ad infrastructure from a company whose 50M paying users out of 900M weekly users means ad revenue is now material to their business model.