Claude Sonnet 4.5 API Pricing

Claude Sonnet 4.5 pricing by provider

22 listings across 9 providers. Token prices are in US dollars per 1M tokens. The highlighted row is the price quoted above.

Other Claude Sonnet 4.5 prices on Anthropic

What Claude Sonnet 4.5 costs in practice

1,000 requests with 2,000 input and 500 output tokens each

100 long-document requests with 100,000 input and 2,000 output tokens each

Claude Sonnet 4.5 features

• Function calling
• Structured output
• Image input
• PDF input
• Reasoning
• Prompt caching
• Web search
• Computer use

Use Claude Sonnet 4.5 with LiteLLM

Call Claude Sonnet 4.5 through the LiteLLM Python SDK, or put it behind the LiteLLM proxy and send OpenAI-format requests to /v1/chat/completions. LiteLLM tracks the cost of every request at these prices.

from litellm import completion

response = completion(
    model="claude-sonnet-4-5",
    messages=[{"role": "user", "content": "Hello!"}],
)

model_list:
  - model_name: claude-sonnet-4-5
    litellm_params:
      model: claude-sonnet-4-5
      api_key: os.environ/ANTHROPIC_API_KEY

curl http://0.0.0.0:4000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sk-1234" \
  -d '{
    "model": "claude-sonnet-4-5",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Claude Sonnet 4.5 FAQ

More Anthropic models

• Claude Sonnet 5.5$2 / $10 per 1M tokens
• Claude Sonnet 5$2 / $10 per 1M tokens
• Claude Sonnet 4.6$3 / $15 per 1M tokens
• Claude Sonnet 4.1$3 / $15 per 1M tokens
• Claude Sonnet 4$3 / $15 per 1M tokens
• Claude Opus 5.5$4 / $20 per 1M tokens
• Claude Opus 4.8 Think$5 / $25 per 1M tokens
• Claude Mythos 5.1$10 / $50 per 1M tokens