Claude 4.5 Sonnet API Pricing

Claude 4.5 Sonnet pricing by provider

1 listing across 1 provider. Token prices are in US dollars per 1M tokens. The highlighted row is the price quoted above.

What Claude 4.5 Sonnet costs in practice

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

Claude 4.5 Sonnet features

• Function calling
• Parallel tool calls
• Structured output
• Image input
• Prompt caching

Use Claude 4.5 Sonnet with LiteLLM

Call Claude 4.5 Sonnet 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="replicate/anthropic/claude-4.5-sonnet",
    messages=[{"role": "user", "content": "Hello!"}],
)

model_list:
  - model_name: claude-4.5-sonnet
    litellm_params:
      model: replicate/anthropic/claude-4.5-sonnet
      # credentials: see the provider's LiteLLM docs page

curl http://0.0.0.0:4000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sk-1234" \
  -d '{
    "model": "claude-4.5-sonnet",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Claude 4.5 Sonnet FAQ

More Anthropic models

• Claude 4.5 Haiku$1 / $5 per 1M tokens
• Claude 4 Opus$5 / $25 per 1M tokens
• Claude 4 Sonnet$3 / $15 per 1M tokens
• Claude Sonnet 5.5$2 / $10 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
• Claude Fable 5.1$10 / $50 per 1M tokens