On October 31, 2026, the cheapest Claude Sonnet 4.5 API we found is UberLLM: buyers paid a median of $1.5555 per million input tokens and $7.7775 per million output tokens over the last 24 hours. That is at least 48% less on both input and output than the closest other provider we checked, OpenRouter ($3.00 and $15.00). Vercel AI Gateway and Requesty are higher still. 71 sellers on the UberLLM market can serve it. UberLLM adds no fee to these prices, and a request that fails is not billed.
Prices as of October 31, 2026, 18:00 UTC. This page is rebuilt every hour.
Use the OpenAI SDK or any OpenAI-compatible client: set the base URL to the UberLLM endpoint, use an UberLLM API key and set the model to "anthropic/claude-sonnet-4.5". The Anthropic SDK works too, through /v1/messages.
Why is Claude Sonnet 4.5 cheaper on UberLLM?
UberLLM is a market: sellers offer Claude Sonnet 4.5 capacity below its list price, and each request goes to a seller that can serve it. A request costs what its seller charged, UberLLM adds no fee to it, and every request is listed with its cost in Activity.
Can a request cost more than this price?
Yes, when the lower-priced sellers are busy. Send provider.max_price with the most you will pay per million tokens: the request only goes to sellers at or under it and is never billed above it.
Are there other fees?
UberLLM adds no fee to model prices. A card fee of 5.5% + $0.50 is added when you buy credit. With the 5.5% added, UberLLM's Claude Sonnet 4.5 price is still lower than every other provider in the table.