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Setup

  1. Create an account at console.anthropic.com
  2. Generate an API key under API Keys
  3. Set the environment variable:
export ANTHROPIC_API_KEY=sk-ant-...
  1. Configure in .langsight.yaml:
investigate:
  provider: anthropic
  model: claude-sonnet-4-6    # default

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Models

ModelContextBest for
claude-sonnet-4-6200KDefault — best balance of speed and quality
claude-opus-4-6200KDeepest analysis, complex multi-server incidents
claude-haiku-4-5200KFast, budget-friendly

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Why Claude for RCA?

Claude uses adaptive thinking on Sonnet and Opus — it reasons through the evidence before producing a report, leading to more accurate root cause identification. This is especially useful for:
  • Correlating multiple degraded servers
  • Identifying supply chain attacks via schema drift
  • Distinguishing transient failures from persistent outages

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Pricing

ModelInputOutputTypical investigate call
claude-sonnet-4-6$3/1M$15/1M~$0.03
claude-opus-4-6$5/1M$25/1M~$0.06
claude-haiku-4-5$1/1M$5/1M~$0.01