Compare Claude Sonnet and GPT-5 for contract clause extraction and risk flagging. From $120/mo for 10K contracts. Hallucination rates compared.
Your usage
Default assumptions
Monthly requests10,000
Avg input tokens4000
Avg output tokens800
When to use this scenario
Contract analysis extracts key clauses — liability caps, termination rights, auto-renewal provisions, IP assignment terms — and flags provisions that deviate from standard templates or carry unusual risk. At law firms and legal operations teams handling thousands of contracts per month, the economics are compelling: a junior associate reviewing a 40-page NDA costs $400–800 in billable time; a model review costs under $0.10.
Claude Sonnet is preferred for legal work because it has lower hallucination rates on specific clause identification and produces more precisely scoped uncertainty signals ("this clause is ambiguous, recommend human review") rather than confident wrong answers. At $3/million input tokens, a 4K-token contract costs $0.012 to process — 10,000 contracts/month runs $120 in input.
Important scope limitation: AI output is a first-pass triage, not legal advice. The pipeline should produce structured output (clause type, text excerpt, risk flag, confidence score) that a human attorney reviews, not a go/no-go recommendation.
Common pitfalls
Treating model output as final legal opinion — hallucinated clause interpretations have created real liability in early deployments
Processing contracts without jurisdiction context — the same liquidated damages clause carries different enforceability in California vs New York vs Germany
Ignoring cross-reference traps: a contract that says "as defined in Exhibit A" requires including Exhibit A in the input or the extraction will be wrong
Using short excerpts instead of full documents — missing surrounding context causes misclassification of standard boilerplate as unusual risk
Drag the slider to split traffic between Claude 4.6 Sonnet (primary) and GPT-5 mini (fallback). See how your monthly bill moves — without writing a line of gateway code.
Primary: Claude 4.6 SonnetFallback: GPT-5 mini
70% Claude30% GPT-5
Blended monthly cost$176at the usage assumed above
Vs all-primary−27%$240 → $176
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