AI BriefingClaude Sonnet 5 Token Costs Double
Key point
The tokenizer change in Claude Sonnet 5 can increase costs by up to 2x for the same tasks.
Details
Claude Sonnet 5 introduces a new tokenizer, generating 1.0 to 1.35 times more tokens for the same content compared to previous versions.
As a result, with token unit prices increased by 50%, actual billing costs can rise by more than 2x. For example, a cost of $2 for 1 million tokens previously becomes $3 for 1.35 million tokens in Sonnet 5, totaling $4.05.
Before the price increase on September 1, it is necessary to check current usage with the /usage command and establish cost optimization strategies such as retaining previous models or improving prompt efficiency, depending on the workload.
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