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Anthropic legacy

Claude Sonnet 4.5

anthropic/claude-sonnet-4-5

Previous generation Sonnet with strong all-around performance. Consider migrating to Sonnet 4.6.

Specifications

Context Window 200K tokens
Context (Beta) 1M tokens
Max Output 64K tokens
Latency fast
Knowledge Cutoff Jan 2025
Training Data Jul 2025

Pricing

Input $3.00 per 1M tokens
Output $15.00 per 1M tokens

Capabilities

text Text generation and understanding
vision Image and visual input processing
tool use Function calling and tool integration
extended thinking Deep reasoning with chain-of-thought

API Identifiers

Model ID anthropic/claude-sonnet-4-5
Provider API ID claude-sonnet-4-5-20250929
AWS Bedrock anthropic.claude-sonnet-4-5-20250929-v1:0
GCP Vertex AI claude-sonnet-4-5@20250929

Usage via Multi-Router

curl https://api.multi-router.ai/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -H "x-mr-router-id: YOUR_ROUTER_ID" \
  -d '{
    "model": "anthropic/claude-sonnet-4-5",
    "messages": [
      {"role": "user", "content": "Hello!"}
    ]
  }'