Claude Sonnet 4.5 API
anthropic/claude-sonnet-4.5
Call Claude Sonnet 4.5 through UberLLM’s OpenAI-compatible API — from $0.7500/M input and $3.75/M output, routed automatically to the cheapest healthy provider. Anthropic · 198,000 token context. No inference markup.
Claude Sonnet 4.5 pricing & providers
| Provider | Input / 1M | Output / 1M |
|---|---|---|
| Surplus Intelligencebest | $0.7500 | $3.75 |
| OpenRouter | $3.00 | $15.00 |
How to use Claude Sonnet 4.5 with the OpenAI SDK
Already using OpenAI or OpenRouter? Change one line — the base URL — and call Claude Sonnet 4.5 with your existing code. Anthropic SDKs work against https://api.uberllm.dev/v1/messages.
from openai import OpenAI
client = OpenAI(
base_url="https://api.uberllm.dev/v1",
api_key="ull_your_key_here",
)
resp = client.chat.completions.create(
model="anthropic/claude-sonnet-4.5",
messages=[{"role": "user", "content": "Hello!"}],
)
print(resp.choices[0].message.content)Claude Sonnet 4.5 API — FAQ
How much does the Claude Sonnet 4.5 API cost?
Claude Sonnet 4.5 costs from $0.7500 per million input tokens and $3.75 per million output tokens through UberLLM, which routes to the cheapest healthy provider. There is no inference markup.
How do I call Claude Sonnet 4.5 via API?
Use any OpenAI-compatible SDK: set the base URL to https://api.uberllm.dev/v1, your UberLLM API key, and model "anthropic/claude-sonnet-4.5". Anthropic SDKs work via https://api.uberllm.dev/v1/messages.
Is Claude Sonnet 4.5 OpenAI-compatible on UberLLM?
Yes. Every model on UberLLM — including Claude Sonnet 4.5 — is served through one OpenAI-compatible endpoint, so you change only the base URL and key.