Expired60% confidenceFactExact time
Sonnet 5 switched to the Opus 4.7 tokenizer, causing the same text to be tokenized into approximately 1.1 to 1.3 times as many tokens.
2
Sources
60%
Confidence
Medium-term (~90 days)
Relevance
7/6/2026
First Seen
Valid until: 10/4/2026(expired)
Sources
Claude Sonnet 5 Hands-On Review: The Hidden Token Trap That Makes 'Low Cost' an Illusion
bilibili浮生千山路w6/30/2026
Related Claims
VerifiedClaude Sonnet 5 switched to the Opus 4.7 tokenizer, which may result in approximately 1 to 1.3 times more tokens being produced from the same text.74% similarUnverifiedIn the agentic computer use benchmark, Opus 4.8 on the high setting and Sonnet 5 on the max setting perform comparably, but Sonnet 5 consumes more tokens70% similarVerifiedSonnet 5's Intelligence Index is 6 points higher than Sonnet 4.6's and surpasses Opus 4.8 on agentic knowledge work tasks.66% similarUnverifiedSonnet 5.5 and Opus 5.5 have the same cache read price, while Sonnet 5.5 is approximately half the price on all other items.64% similarVerifiedSonnet 5 achieved a score of 80.4% on Terminal Bench 2.1, approaching Opus 4.8.63% similar
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