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  1. Home
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  3. Claude Opus 4.5
  4. Adversarial Contract Review

See how Claude Opus 4.5 compares on this challenge:

  • Claude Opus 4.5 vs Claude Sonnet 4.6
  • Claude Opus 4.5 vs Gemini 3.1 Pro Preview
  • Claude Opus 4.5 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 4.5

Adversarial Contract Review

Claude Opus 4 5's response to the 'Adversarial Contract Review' challenge.

Claude Opus 4.5
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 4.5
Response

claude-opus-4.5 logo
Claude Opus 4.5Adversarial Contract Review
claude-opus-4.5 logo
Claude Opus 4.5

Contract Analysis: Critical Issues for the Contractor

This agreement is heavily one-sided and contains several provisions that could be exploited against you. Here's my detailed analysis:


1. SCOPE CLAUSE — Unlimited Scope Creep

Problem: "Client reserves the right to modify the scope at any time without additional compensation."

This is a blank check provision. The client could triple your workload while paying for the original estimate.

Suggested revision:

"Scope changes shall be documented in a written Change Order signed by both parties. Changes exceeding 10% of original estimated hours shall require renegotiation of timeline and compensation."

Legal reasoning: Contracts require mutual consideration. Unlimited unilateral modification rights arguably fail this requirement and are unconscionable in many jurisdictions.


2. PAYMENT CLAUSE — Three Separate Problems

Problem A: 90-day payment terms are unusually long (industry standard is Net 30).

Problem B: "Unsatisfactory" is undefined and determined at Client's "sole discretion" — this creates a subjective escape hatch from payment obligations.

Problem C: No late payment penalties or interest provisions.

Suggested revision:

"Payment due within 30 days of invoice receipt. Late payments accrue interest at 1.5% monthly. Deliverables deemed unsatisfactory must be identified in writing within 14 days of delivery with specific deficiencies noted. Contractor shall have 14 days to cure identified deficiencies before payment may be withheld."

Legal reasoning: The "sole discretion" language could constitute an illusory promise, potentially making the payment obligation unenforceable against the client. Courts disfavor contracts where one party can arbitrarily avoid performance.


3. INTELLECTUAL PROPERTY — Overreaching Assignment

Problem: The clause captures your pre-existing IP — tools, frameworks, and methodologies you bring to the engagement. This could mean losing ownership of work you created years before this contract.

Suggested revision:

"Work Product created specifically for Client under this Agreement shall be Client's property. Contractor's Pre-Existing IP remains Contractor's property; Client receives a perpetual, non-exclusive license to use Pre-Existing IP as incorporated into deliverables. 'Pre-Existing IP' means any tools, libraries, methodologies, or code owned by Contractor prior to this engagement or developed outside this engagement's scope."

Legal reasoning: Courts in some jurisdictions have limited overly broad IP assignments, but you shouldn't rely on judicial intervention. Carve-outs for pre-existing IP are industry standard.


4. NON-COMPETE — Likely Overbroad

Problem: 24 months covering an entire "industry" is extremely restrictive and may be unenforceable—but litigation to prove that is expensive.

Issues:

  • Duration (24 months is at the outer edge of enforceability)
  • Geographic scope (undefined = potentially worldwide)
  • "Industry" is vague (if Client is in fintech, does this cover all finance AND all tech?)

Suggested revision:

"For 12 months following termination, Contractor shall not provide services to [specifically named competitors] within [defined geographic region]. This restriction applies only to substantially similar services directly competing with work performed under this Agreement."

Legal reasoning: Non-competes must be reasonable in duration, geography, and scope to be enforceable. Many states (California notably) void them entirely for independent contractors. However, even unenforceable clauses create litigation risk.


5. TERMINATION — Severely Asymmetric

Problem: Client can terminate instantly; you must give 60 days notice. Upon termination, you must surrender work-in-progress without compensation.

Suggested revision:

"Either party may terminate with 14 days written notice. Upon termination, Client shall pay for all hours worked through termination date plus documented wind-down costs. Work-in-progress shall be delivered upon receipt of final payment."

Legal reasoning: The asymmetry itself isn't illegal, but combined with the scope and payment provisions, it creates a scenario where the client could demand extensive work, terminate without notice, claim dissatisfaction, withhold payment, and still keep your work product.


6. LIABILITY — Unlimited Exposure

Problem: You're assuming unlimited liability including consequential damages (lost profits, business interruption, etc.). A bug in production could theoretically expose you to millions in damages.

Suggested revision:

"Contractor's total liability shall not exceed the fees paid under this Agreement during the 12 months preceding the claim. Neither party shall be liable for consequential, incidental, or punitive damages. Contractor does not warrant that deliverables will be error-free but will remedy documented defects reported within 90 days of delivery."

Legal reasoning: Unlimited liability provisions in commercial contracts are unusual and potentially uninsurable. Standard professional liability insurance typically excludes unlimited consequential damages.


7. INDEMNIFICATION — "Regardless of Fault"

Problem: The phrase "regardless of fault" means you could be liable for the Client's own negligence or third-party actions entirely outside your control.

Suggested revision:

"Contractor shall indemnify Client against third-party claims arising directly from Contractor's gross negligence or willful misconduct in performing services. Client shall indemnify Contractor against claims arising from Client's use of deliverables in violation of applicable law or in combination with materials not provided by Contractor."

Legal reasoning: Mutual indemnification is standard. One-way indemnification "regardless of fault" may be unconscionable and could void your professional liability insurance coverage.


8. CONFIDENTIALITY — Gag Clause Concerns

Problem: You cannot disclose "any information about this engagement, including the terms of this agreement." This could prevent you from:

  • Listing the client on your resume/portfolio
  • Discussing the engagement with your attorney or accountant
  • Reporting illegal activity

Suggested revision:

"Contractor shall maintain confidentiality of Client's proprietary business information and trade secrets. Contractor may disclose: (a) engagement existence and general nature for portfolio purposes; (b) agreement terms to legal and financial advisors under duty of confidentiality; (c) information required by law. Agreement terms are mutually confidential."

Legal reasoning: Overly broad confidentiality provisions may conflict with whistleblower protections and public policy. The SEC, NLRB, and other agencies have taken action against provisions that could chill legally protected disclosures.


9. DISPUTE RESOLUTION — Stacked Against You

Problem: Arbitration in Client's home jurisdiction with loser-pays costs creates significant barriers to pursuing legitimate claims.

Issues:

  • You must travel to their jurisdiction
  • "Loser pays" discourages you from disputing even valid claims
  • Arbitration waives jury trial rights
  • No carve-out for small claims court

Suggested revision:

"Disputes under $15,000 may be brought in small claims court in either party's jurisdiction. Other disputes shall be resolved through arbitration in a mutually agreed location, or via video conference. Each party bears its own costs; arbitrator fees split equally. Arbitrator shall have authority to award reasonable attorneys' fees to the prevailing party in cases of bad faith conduct."


Summary Risk Matrix

ClauseRisk LevelExploitability
ScopeHIGHUnlimited unpaid work
PaymentHIGHPayment avoidance
IPHIGHLoss of pre-existing assets
Non-CompeteMEDIUMLivelihood restriction
TerminationHIGHWork theft
LiabilityCRITICALFinancial ruin
IndemnificationCRITICALLiability for others' actions
ConfidentialityMEDIUMSilencing legitimate speech
ArbitrationMEDIUMBarrier to justice

Recommendations

  1. Do not sign as-is — This contract is structured to maximize client leverage and minimize your protections.

  2. Priority negotiations: Liability cap, IP carve-outs, payment terms, and scope change process are non-negotiable modifications.

  3. Get professional liability insurance and confirm coverage with these terms (current language may void coverage).

  4. Consult an attorney in your jurisdiction before signing, particularly regarding the non-compete enforceability.

  5. Consider the relationship signal — A client presenting these terms may be difficult to work with regardless of contract modifications.


This analysis is for informational purposes and does not constitute legal advice. Consult a licensed attorney in your jurisdiction for advice specific to your situation.

Adversarial Contract Review

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About Claude Opus 4.5

Capabilities

ConversationReasoningCode GenerationAnalysisTool Use

Categories

TextCodeMultimodal

Specifications

Provider
Anthropic
Released
2025-11-24
Size
XLARGE

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Claude Sonnet 4.6's version

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