Platform Notes Cut Sonnet 5.5 Cache Reads to Ten Cents
The 7 October Claude platform notes price Sonnet 5.5 prompt-cache reads at $0.10 per million tokens and leave cache writes unchanged.
Direct answer
The Claude platform notes for 7 October 2026 say prompt-cache reads on Claude Sonnet 5.5 dropped from $0.20 to $0.10 per million tokens, which is 0.05x the base input price instead of 0.1x. Cache writes and all other prices are unchanged.
The Claude platform release notes for 7 October 2026 open with a pricing line for prompt caching. The line says the price of prompt cache reads on Claude Sonnet 5.5 was lowered from $0.20 USD to $0.10 USD per million tokens. It states the new rate as 0.05x the base input price instead of 0.1x. The same sentence says cache writes and all other prices are unchanged, and it points to the prompt caching pricing section.
This is a platform price note, not a description of a local cost display. It names Sonnet 5.5 cache reads only. It does not print a new figure for cache writes, for uncached input, or for any other model on this bullet. The ratio is given twice, once as dollars per million tokens and once as a fraction of the base input price, and both forms match: ten cents is one-twentieth of the base, which is the 0.05x the note prints, down from one-tenth.
What sits beside the price line
The same date has a second bullet launching Claude Haiku 5.5 and a third bullet on calls that can return HTTP 400 after a move from Haiku 4.5. Those bullets are about a model launch and request compatibility. They are not part of the cache-read price sentence. Reading the date as a general discount would go past what the first bullet writes.
FAQ
- Did cache writes change on this date?
- The note says cache writes and all other prices are unchanged.
- What ratio does the note print?
- It says 0.05x the base input price, down from 0.1x.