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Date	Provider	Score	Summary
14 Aug 2026, 3:30 PM	The Register	7.0	Claude Code returns blank thinking blocks, but reasoning still costs you 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. anthropic claude api-billing reasoning-tokens cost-optimization

Date

Provider

Score

Summary

14 Aug 2026, 3:30 PM

The Register

7.0

Claude Code returns blank thinking blocks, but reasoning still costs you

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.