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Fastlane

Claude Sonnet 4

Claude Sonnet 4

Section titled “Claude Sonnet 4”

Provider: Anthropic Context Window: 200,000 tokens Quality: High Price: $3.00 per 1M input tokens

Overview

Section titled “Overview”

Claude Sonnet 4 is Anthropic’s latest and most capable model. It excels at nuanced analysis, long-form writing, and complex reasoning tasks with a massive 200K context window.

Best For

Section titled “Best For”
  • Long document analysis and summarization
  • Complex multi-step reasoning
  • Code review and debugging
  • Creative writing and content generation

Pricing

Section titled “Pricing”
Tier Input Output
BYOK $3.00/1M $15.00/1M
Marketplace $3.09/1M $15.45/1M

Routing Recommendation

Section titled “Routing Recommendation”
  • Accurate mode: Top choice for complex analysis and writing
  • Balanced mode: Selected when quality is important
  • Cheap mode: Rarely selected
  • Eco mode: Never selected

Usage

Section titled “Usage”
Terminal window
curl http://127.0.0.1:8787/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{"model": "fastlane-auto", "messages": [{"role": "user", "content": "Analyze this codebase for security issues"}]}'

Requirements

Section titled “Requirements”
  • Anthropic API key in settings, or
  • Marketplace balance (3% markup applies)