Claude Sonnet 4 (2025-05-14)

by AnthropicAnthropic
anthropic/claude-4-sonnet-20250514
anthropic/claude-4-sonnet-20250514-thinking

A mid-size hybrid-reasoning model that balances fast responses and deeper chain-of-thought logic—ideal for coding, analysis, and multimodal tasks.

Performance Metrics

Context

200K

Input

$2.1
$3

Output

$10.5
$15

Latency

0.95s

Uptime

99.98 %

Getting Started

Use this model through our unified API endpoint

curl -X POST "https://api.firstrouter.ai/v1/chat/completions" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "anthropic/claude-4-sonnet-20250514",
    "messages": [
      {
        "role": "user",
        "content": "Hello, how are you?"
      }
    ]
  }'