Anthropic

Claude Sonnet 5

Anthropic's next-generation Sonnet — near-Opus coding and agentic capability at Sonnet speed and cost, the default for everyday development

Category Text Model ID claude-sonnet-5

Context Length1M tokens

Model TypeLarge Language Model (LLM)

MultimodalText, Image Input

Pricing & Specs

💰 Pricing

Input$3 / M tokens

Output$15 / M tokens

Cache Write5m: $3.75 / MTok; 1h: $6 / MTok

Cache Hit$0.30 / MTok

⚙️ Specs

Context Length1M tokens

Model TypeLarge Language Model (LLM)

MultimodalText, Image Input

Adaptive ThinkingSupported (on by default)

Max Output128K tokens

Release DateJune 30, 2026

Knowledge CutoffJanuary 2026

API CompatibilityClaude API, Claude Code, OpenAI API

API Examples

Python

import anthropic

client = anthropic.Anthropic(
    api_key="your-api-key"
)

message = client.messages.create(
    model="claude-sonnet-5",
    max_tokens=1024,
    messages=[
        {"role": "user", "content": "Hello, Claude!"}
    ]
)

print(message.content[0].text)

cURL

curl https://api.xairouter.com/v1/messages
  -H "Content-Type: application/json"
  -H "x-api-key: YOUR_API_KEY"
  -H "anthropic-version: 2023-06-01"
  -d '{
    "model": "claude-sonnet-5",
    "max_tokens": 1024,
    "messages": [
      {"role": "user", "content": "Hello, Claude!"}
    ]
  }'

Developer Assist

# Set environment variables in terminal
export ANTHROPIC_AUTH_TOKEN=sk-Xvs...  # Your API Key
export ANTHROPIC_BASE_URL=https://api.xairouter.com

# Start Claude Code
claude

# Now you can use claude-sonnet-5 model directly for development

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