Providers outside the index, such as the hyperscalers: each one's lowest on-demand price per GPU-hour as it posts it, not standardized to the benchmark contract; a price posted in euros is converted at the European Central Bank's rate of the day, with the euro price under it (methodology).
Claude Sonnet 4.5 is a model from Anthropic. Its posted API price is $3.00 per 1M input tokens, $0.30 per 1M cached input tokens and $15.00 per 1M output tokens, or $0.771 per 1M tokens at the mix of tokens agents send (87% cache read, 12% input, 1% output). Its price has not changed since Sep 29, 2025. It carries 4.3% of Anthropic's API tokens and is one of the 5 models in the Anthropic token price index, $0.545 per 1M tokens today. Of the 36 models in the token index it is the 3rd most expensive. At today's H100 rental price of $3.69 per GPU-hour, its break-even throughput is 171 tokens per second per GPU at its list price (3 input : 1 output). Prices are collected once a day, for each UTC day.
Models near this price
Claude Opus 5.5 (Anthropic): $0.854 per 1M tokens at the mix, $4.00 input and $20.00 output
Kimi K3 (Moonshot AI): $0.771 per 1M tokens at the mix, $3.00 input and $15.00 output
Grok 4.7 (xAI): $0.735 per 1M tokens at the mix, $2.00 input and $6.00 output
Claude Sonnet 5 (Anthropic): $0.514 per 1M tokens at the mix, $2.00 input and $10.00 output
Kimi K3.1 Pro (Moonshot AI): $0.514 per 1M tokens at the mix, $2.00 input and $10.00 output
GLM 5.3 (Z.ai): $0.438 per 1M tokens at the mix, $1.40 input and $4.40 output
Cite as: Compute Screener, “Claude Sonnet 4.5 API price”, computescreener.com/models/claude-sonnet-4-5. The figures are free to reuse under CC BY 4.0 with credit to Compute Screener.