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© 2026 Rival
  1. Home
  2. Models
  3. Claude Opus 4.1
  4. Adversarial Contract Review

See how Claude Opus 4.1 compares on this challenge:

  • Claude Opus 4.1 vs Claude Sonnet 4.6
  • Claude Opus 4.1 vs Gemini 3.1 Pro Preview
  • Claude Opus 4.1 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 4.1

Adversarial Contract Review

Claude Opus 4 1's response to the 'Adversarial Contract Review' challenge.

Claude Opus 4.1
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 4.1
Response

claude-opus-4.1 logo
Claude Opus 4.1Adversarial Contract Review
claude-opus-4.1 logo
Claude Opus 4.1

This contract is extremely one-sided and contains numerous exploitative clauses. Here's a detailed analysis with suggested modifications:

EXPLOITATIVE CLAUSES AND RECOMMENDED FIXES

1. SCOPE CLAUSE

Problem: Unlimited scope changes without additional compensation creates unbounded liability. Legal Issue: Violates the principle of consideration and mutual agreement for contract modifications. Modification:

"Any scope changes exceeding 10% of original project scope require written amendment with adjusted compensation. Minor clarifications within original scope may be made by mutual written agreement."

2. PAYMENT TERMS

Problems:

  • 90-day payment terms (industry standard is 30 days)
  • Subjective "unsatisfactory" standard allows arbitrary non-payment Legal Issue: Vague performance standards are often unenforceable; unreasonable payment terms may violate prompt payment laws. Modification:

"Payment due within 30 days of invoice. Client may dispute specific deliverables in writing within 10 days, citing objective acceptance criteria. Undisputed amounts must be paid on schedule."

3. INTELLECTUAL PROPERTY

Problem: Claims ownership of Contractor's pre-existing IP and all methodologies. Legal Issue: Overreaching IP assignment; may be unconscionable. Modification:

"Client owns custom work product created specifically for Client. Contractor retains all pre-existing IP and grants Client a perpetual license to use it within delivered work. Contractor retains rights to general methodologies, know-how, and non-client-specific tools."

4. NON-COMPETE

Problem: 24-month industry-wide restriction is likely unenforceable as overly broad. Legal Issue: Non-competes must be reasonable in time, geography, and scope to be enforceable. Modification:

"Contractor agrees not to directly solicit Client's customers for similar services for 6 months following termination. This does not restrict Contractor from working with other companies in the same industry."

5. TERMINATION

Problem: Asymmetric notice requirements and unpaid work delivery. Legal Issue: Unconscionable one-sided terms; unjust enrichment. Modification:

"Either party may terminate with 30 days written notice. Upon termination, Contractor will deliver completed work and be compensated for all work performed through termination date, including work in progress on a pro-rata basis."

6. LIABILITY

Problem: Unlimited liability for all issues including consequential damages. Legal Issue: Professional service contracts typically limit liability; unlimited liability is commercially unreasonable. Modification:

"Contractor's liability is limited to direct damages not exceeding fees paid in the 12 months preceding the claim. Neither party is liable for consequential, indirect, or special damages. This limitation does not apply to gross negligence or willful misconduct."

7. INDEMNIFICATION

Problem: Broad indemnification "regardless of fault" is unconscionable. Legal Issue: Requiring indemnification without fault violates public policy in many jurisdictions. Modification:

"Each party shall indemnify the other for claims arising from that party's negligence or breach. Contractor indemnifies Client for third-party IP infringement claims arising from Contractor's deliverables, excluding Client-provided materials."

8. CONFIDENTIALITY

Problem: Prevents Contractor from discussing engagement terms, hindering future negotiations. Legal Issue: May violate labor laws protecting wage discussions; overly broad. Modification:

"Contractor shall protect Client's confidential business information for 2 years post-termination. This does not restrict Contractor from: (a) disclosing engagement terms to legal/financial advisors, (b) listing Client as a reference with permission, or (c) complying with legal requirements."

9. DISPUTE RESOLUTION

Problem: Loser-pays arbitration in Client's jurisdiction creates financial risk and forum disadvantage. Legal Issue: One-sided forum selection and fee-shifting may be unconscionable. Modification:

"Disputes shall be resolved through arbitration in a mutually agreed neutral location or via online arbitration. Each party bears its own costs unless arbitrator finds bad faith, in which case the arbitrator may award reasonable fees."

ADDITIONAL RECOMMENDED CLAUSES

Add "Entire Agreement" Clause:

"This Agreement supersedes all prior negotiations and may only be modified in writing signed by both parties."

Add "Severability" Clause:

"If any provision is deemed unenforceable, the remainder of the Agreement continues in effect."

Add "Independent Contractor Status" Clause:

"Contractor is an independent contractor, not an employee, and is responsible for their own taxes, benefits, and insurance."

LEGAL REASONING SUMMARY

Courts generally apply these principles to service contracts:

  • Unconscionability doctrine: Prevents enforcement of extremely one-sided terms
  • Mutual consideration: Both parties must receive value for contract modifications
  • Reasonable commercial standards: Terms should reflect industry norms
  • Public policy limitations: Contracts cannot violate labor laws or public policy

This original contract would likely face enforceability challenges in most jurisdictions due to its extremely one-sided nature. The modifications create a more balanced, commercially reasonable agreement that protects both parties' legitimate interests while remaining legally enforceable.

Adversarial Contract Review

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About Claude Opus 4.1

Capabilities

ConversationReasoningCode GenerationAnalysisAgentic Tool UsePlanning

Categories

TextCodeMultimodal

Specifications

Provider
Anthropic
Released
2025-08-05
Size
XLARGE
Parameters
Not disclosed
Context
200,000 tokens

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SAME PROMPT

Claude Sonnet 4.6's version

Same prompt, different result

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