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© 2026 Rival
  1. Home
  2. Models
  3. Claude Opus 4
  4. Adversarial Contract Review

See how Claude Opus 4 compares on this challenge:

  • Claude Opus 4 vs Claude Sonnet 4.6
  • Claude Opus 4 vs Gemini 3.1 Pro Preview
  • Claude Opus 4 vs Z.ai: GLM 5

4 models have responded to the "Adversarial Contract Review" challenge. Compare their approaches side-by-side on RIVAL. This response is part of RIVAL's open dataset of 5,600+ AI model responses.

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Back to Claude Opus 4

Adversarial Contract Review

Claude Opus 4's response to the 'Adversarial Contract Review' challenge.

Claude Opus 4
February 3, 2026
Text

?
Prompt

Here is a contract for a software consulting engagement: --- SOFTWARE CONSULTING AGREEMENT This Agreement is entered into between TechCorp Solutions Inc. ("Client") and [Contractor Name] ("Contractor"). 1. SCOPE: Contractor shall provide software development services as directed by Client. Client reserves the right to modify the scope at any time without additional compensation. 2. PAYMENT: Contractor shall be paid $150/hour, invoiced monthly. Payment is due within 90 days of invoice receipt. Client may withhold payment if deliverables are deemed "unsatisfactory" at Client's sole discretion. 3. INTELLECTUAL PROPERTY: All work product, including any tools, libraries, or methodologies developed during the engagement, shall be the exclusive property of Client in perpetuity, including any work created using Contractor's pre-existing IP. 4. NON-COMPETE: Contractor agrees not to provide similar services to any company in the same industry as Client for 24 months following termination. 5. TERMINATION: Client may terminate this agreement at any time without notice. Contractor must provide 60 days written notice. Upon termination, Contractor must immediately deliver all work in progress without additional compensation. 6. LIABILITY: Contractor assumes all liability for any bugs, security vulnerabilities, or system failures in delivered software, including consequential damages, with no cap on liability. 7. INDEMNIFICATION: Contractor shall indemnify Client against all claims arising from Contractor's work, including claims by third parties, regardless of fault. 8. CONFIDENTIALITY: Contractor shall not disclose any information about this engagement, including the terms of this agreement, for 5 years after termination. 9. DISPUTE RESOLUTION: Any disputes shall be resolved through binding arbitration in Client's home jurisdiction, with costs borne by the losing party. --- Find all clauses that could be exploited against the contractor, suggest specific modifications, and explain the legal reasoning.

Claude Opus 4
Response

claude-opus-4 logo
Claude Opus 4Adversarial Contract Review
claude-opus-4 logo
Claude Opus 4

This contract is heavily biased against the Contractor. Here are the problematic clauses with suggested modifications and legal reasoning:

1. SCOPE CLAUSE

Problem: Unlimited scope changes without additional compensation creates an unconscionable "blank check" obligation. Modification: "Any material changes to scope requiring more than 10% additional effort shall be documented in writing with corresponding fee adjustments." Legal Reasoning: Courts generally disfavor contracts that allow one party unlimited modification rights without consideration.

2. PAYMENT TERMS

Problems:

  • 90-day payment terms are excessive
  • Subjective "unsatisfactory" standard for withholding payment Modifications:
  • "Payment due within 30 days"
  • "Client may withhold payment only for material breaches after providing written notice and 10-day cure period" Legal Reasoning: Payment terms must be reasonable, and withholding must be based on objective criteria to avoid unjust enrichment.

3. INTELLECTUAL PROPERTY

Problem: Overly broad - claims ownership of Contractor's pre-existing IP and methodologies. Modification: "Client owns work product created specifically for Client. Contractor retains all pre-existing IP and grants Client a license to use such IP solely within the delivered work product." Legal Reasoning: Work-for-hire should not retroactively capture pre-existing IP without explicit, separate consideration.

4. NON-COMPETE

Problem: 24-month industry-wide restriction is likely unenforceable as overly broad. Modification: "Contractor agrees not to directly solicit Client's customers for similar services for 6 months within [specific geographic area]." Legal Reasoning: Non-competes must be reasonable in time, geography, and scope to be enforceable. Industry-wide bans rarely survive judicial scrutiny.

5. TERMINATION

Problem: Asymmetric notice requirements and no compensation for work in progress. Modification:

  • "Either party may terminate with 30 days written notice"
  • "Contractor shall be compensated for all work completed through termination date" Legal Reasoning: Mutual termination rights and quantum meruit principles require payment for work performed.

6. LIABILITY

Problem: Unlimited liability for all issues is unconscionable and likely uninsurable. Modification: "Contractor's liability limited to fees paid under this agreement, excluding cases of gross negligence or willful misconduct. Client acknowledges software may contain bugs despite best efforts." Legal Reasoning: Commercial contracts typically include liability caps, and unlimited consequential damages for software bugs would make consulting economically unfeasible.

7. INDEMNIFICATION

Problem: "Regardless of fault" language creates strict liability. Modification: "Contractor shall indemnify Client for third-party claims arising from Contractor's gross negligence or willful misconduct." Legal Reasoning: Indemnification should be fault-based and mutual, not create strict liability.

8. CONFIDENTIALITY

Problem: Prohibiting disclosure of contract terms prevents Contractor from seeking legal advice or using as reference. Modification: "Contractor shall maintain confidentiality of Client's proprietary information. This Agreement's existence and general nature may be disclosed; specific terms remain confidential." Legal Reasoning: Overly broad confidentiality can prevent enforcement of legal rights.

9. DISPUTE RESOLUTION

Problem: Loser-pays arbitration in Client's jurisdiction is one-sided. Modification: "Arbitration in mutually agreed location with each party bearing own costs, unless arbitrator finds bad faith." Legal Reasoning: Arbitration clauses should be mutual and not create prohibitive cost barriers to asserting rights.

ADDITIONAL RECOMMENDED CLAUSES:

  1. Limitation of Liability: Add mutual limitation of liability clause
  2. Insurance: Specify reasonable insurance requirements
  3. Independent Contractor Status: Clarify tax and benefit responsibilities
  4. Governing Law: Specify governing law separate from jurisdiction
  5. Severability: If any clause is unenforceable, remainder survives

Overall Assessment: This contract is so one-sided it risks being deemed an unconscionable adhesion contract. Courts may refuse to enforce such agreements or apply the doctrine of reasonable expectations to interpret ambiguities against the drafting party.

Adversarial Contract Review

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About Claude Opus 4

Capabilities

ConversationReasoningCode GenerationAnalysisAgentic Tool UseMemory

Categories

TextCodeMultimodal

Specifications

Provider
Anthropic
Released
2025-05-22
Size
XLARGE
Parameters
Not disclosed
Context
200,000 tokens

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