Claude Sonnet 5.5 Pricing

Claude Sonnet 5.5 API pricing

Claude Sonnet 5.5 API pricing is $2 per million input tokens and $10 per million output tokens, verified October 8, 2026.

Input (per 1M tokens)

$2

Output (per 1M tokens)

$10

Cached input (per 1M tokens)

$0.1

Cache write, 5m TTL

$2.5

Cache write, 1h TTL

$4

Batch discount

50%

No Claude Sonnet 5.5 price changes have been recorded yet.

No price snapshots recorded yet.

Frequently asked questions

Short answers to the most common questions about Claude Sonnet 5.5 pricing, limits, and capabilities.

Notes

ADDED 2026-10-08, read directly from platform.claude.com/docs/en/about-claude/pricing. Positioned as the best combination of speed and intelligence. STANDARD: input $2 / output $10 / cache write 5m $2.50 / cache write 1h $4 / cache read $0.10 per MTok. Batch API halves input and output to $1 / $5. US regional endpoint bills at 1.1x. No fast mode listed for Sonnet 5.5 — fast mode is an Opus-tier feature. SAME HEADLINE PRICE AS SONNET 5: both are $2 / $10, so this is a capability upgrade at a flat price rather than a price move. Sonnet 5 remains listed and is NOT deprecated. The difference is in caching, see below. CACHE STRUCTURE CHANGED: on Sonnet 5.5 and Opus 5.5 a cache hit costs 5% of standard input, against 10% on Sonnet 5 ($0.20). So cached Sonnet 5.5 input is $0.10, literally half the cached cost of Sonnet 5 at the same headline rate. For cache-heavy workloads the real saving sits here, not in the headline. Context Window and Max Output Tokens deliberately left EMPTY — not stated for this model on the pricing page. Fill from the model overview page rather than assuming.