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© 2026 Rival
  1. Home
  2. Models
  3. Claude Sonnet 4.5
  4. Adversarial Contract Review

See how Claude Sonnet 4.5 compares on this challenge:

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

Adversarial Contract Review

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

Claude Sonnet 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 Sonnet 4.5
Response

claude-4.5-sonnet logo
Claude Sonnet 4.5Adversarial Contract Review
claude-4.5-sonnet logo
Claude Sonnet 4.5

Contract Analysis: Exploitable Clauses & Recommended Modifications

This contract is heavily one-sided and contains multiple provisions that expose the contractor to significant legal and financial risk. Here's a detailed analysis:


🚨 CRITICAL ISSUES

1. SCOPE (Clause 1)

Exploitable Language:

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

Problems:

  • Creates unlimited obligation with fixed compensation
  • No protection against scope creep
  • Client could demand exponentially more work for same pay
  • Makes project planning and profitability impossible

Recommended Modification:

"Any changes to the scope of work must be documented in a written 
change order signed by both parties. Changes that increase the 
estimated hours by more than 10% will require renegotiation of 
fees and timeline. Contractor may decline scope changes that 
materially alter the original engagement."

Legal Reasoning: Courts disfavor contracts lacking "definiteness" and may find unlimited scope modifications constitute a failure of consideration or create an illusory contract.


2. PAYMENT (Clause 2)

Exploitable Language:

"Payment is due within 90 days" + "Client may withhold payment if deliverables are deemed 'unsatisfactory' at Client's sole discretion."

Problems:

  • 90-day payment terms are unreasonable (industry standard: 30 days)
  • "Sole discretion" creates subjective standard allowing indefinite non-payment
  • No dispute mechanism for quality disagreements
  • Cash flow nightmare for contractor

Recommended Modification:

"Payment is due within 30 days of invoice receipt. Late payments 
shall accrue interest at 1.5% per month. If Client disputes any 
deliverable quality, Client must provide specific written 
objections within 10 business days of delivery. Contractor shall 
have 15 business days to cure any legitimate deficiencies. Client 
may only withhold payment proportional to the disputed portion of 
work, not to exceed 15% of the invoice total pending resolution."

Legal Reasoning: "Satisfaction" clauses must meet a "reasonable person" standard, not purely subjective discretion (UCC § 2-103). Unlimited withholding power may constitute bad faith under the implied covenant of fair dealing.


3. INTELLECTUAL PROPERTY (Clause 3)

Exploitable Language:

"All work product... including any work created using Contractor's pre-existing IP."

Problems:

  • Transfers contractor's pre-existing tools/frameworks to client
  • Could destroy contractor's ability to work in their field
  • No compensation for transfer of valuable pre-existing IP
  • "Methodologies" language could claim contractor's general knowledge

Recommended Modification:

"Client shall own all work product specifically created for Client 
under this Agreement ('Custom Work Product'). Contractor retains 
all rights to: (a) pre-existing intellectual property, tools, 
frameworks, and libraries created prior to this engagement; 
(b) general skills, knowledge, and expertise; (c) generalized 
tools and methodologies not specific to Client's business. 
Contractor grants Client a perpetual, non-exclusive, royalty-free 
license to use any pre-existing IP incorporated into deliverables. 
Contractor may reuse general approaches and non-confidential 
techniques in future work."

Legal Reasoning: Overbroad IP assignments may be unenforceable as unconscionable or as unlawful restraints on trade. California and other states have specific protections for employee/contractor knowledge and skills.


4. NON-COMPETE (Clause 4)

Exploitable Language:

"Not to provide similar services to any company in the same industry... for 24 months"

Problems:

  • May be completely unenforceable in many jurisdictions
  • No geographic limitation (worldwide ban?)
  • "Same industry" is vague and could be interpreted broadly
  • 24 months is excessive for consulting work
  • No compensation for restriction
  • Could prevent contractor from earning a living

Recommended Modification:

"This clause is DELETED. If Client requires non-solicitation 
protections, the following applies: Contractor agrees not to 
directly solicit Client's employees or customers identified to 
Contractor during this engagement for 12 months following 
termination. This does not restrict Contractor from working in 
the industry or accepting business from parties who initiate 
contact with Contractor."

Legal Reasoning:

  • California: Non-competes are void except in sale-of-business contexts (Cal. Bus. & Prof. Code § 16600)
  • Other states: Require reasonable scope (time, geography, activities) and consideration
  • For independent contractors (vs. employees), courts apply heightened scrutiny
  • Restraints must protect legitimate business interests, not simply restrict competition

5. TERMINATION (Clause 5)

Exploitable Language:

"Client may terminate... at any time without notice" + "Contractor must provide 60 days written notice" + "deliver all work in progress without additional compensation"

Problems:

  • Completely asymmetrical termination rights
  • Client can terminate immediately; contractor needs 60 days
  • Unpaid work-in-progress must be delivered (free work)
  • No kill fee or wind-down compensation
  • Contractor could lose weeks of unbilled work

Recommended Modification:

"Either party may terminate this Agreement with 30 days written 
notice. Client may terminate immediately for Cause (defined as 
material breach, fraud, or gross negligence). Upon termination, 
Contractor shall be compensated for all work performed through 
the termination date, including work in progress, calculated on 
a pro-rata basis. Client shall pay a termination fee equal to 
50% of the average monthly billing for the prior 3 months if 
terminating without Cause. Contractor shall deliver all completed 
work and work-in-progress upon receipt of payment for such work."

Legal Reasoning: At-will termination is permitted, but requiring delivery of work without compensation may constitute unjust enrichment. Asymmetric notice periods may evidence unconscionability.


6. LIABILITY (Clause 6)

Exploitable Language:

"Contractor assumes all liability... including consequential damages, with no cap on liability"

Problems:

  • CATASTROPHICALLY DANGEROUS for contractor
  • Unlimited liability could result in personal bankruptcy
  • Includes consequential damages (lost profits, business interruption)
  • A single bug could expose contractor to millions in damages
  • No insurance policy would cover unlimited liability
  • Completely disproportionate to compensation ($150/hr)

Recommended Modification:

"Contractor's total aggregate liability under this Agreement shall 
not exceed the total fees paid to Contractor in the 12 months 
preceding the claim, or $50,000, whichever is less. CONTRACTOR 
SHALL NOT BE LIABLE FOR CONSEQUENTIAL, INCIDENTAL, INDIRECT, 
SPECIAL, OR PUNITIVE DAMAGES, INCLUDING LOST PROFITS, LOST DATA, 
OR BUSINESS INTERRUPTION, EVEN IF ADVISED OF THE POSSIBILITY. 
This limitation does not apply to: (a) Contractor's gross 
negligence or willful misconduct; (b) Contractor's breach of 
confidentiality; (c) Contractor's infringement of third-party IP 
rights. Client shall maintain appropriate cyber insurance and 
backup systems. Contractor's liability for ordinary negligence 
is limited to re-performance of deficient services."

Legal Reasoning:

  • Limitation of liability clauses are generally enforceable
  • Unlimited liability for professional services is commercially unreasonable
  • Disproportion between compensation and risk may render clause unconscionable
  • Industry standard is to cap at fees paid or 1-2x annual fees

7. INDEMNIFICATION (Clause 7)

Exploitable Language:

"Contractor shall indemnify Client against all claims... regardless of fault"

Problems:

  • "Regardless of fault" means contractor pays even if Client caused the problem
  • Could include Client's own negligence or misconduct
  • No cap on indemnification obligation
  • Could cover third-party IP claims even for Client-provided materials
  • Potentially uninsurable

Recommended Modification:

"Contractor shall indemnify Client against third-party claims that 
Custom Work Product created solely by Contractor infringes third-
party intellectual property rights, provided that: (a) Client 
promptly notifies Contractor of the claim; (b) Contractor has sole 
control of the defense; (c) Client reasonably cooperates in the 
defense. Contractor shall not indemnify Client for: (i) Client's 
modifications to deliverables; (ii) use of deliverables in 
combination with non-Contractor materials; (iii) Client's 
specifications or provided materials; (iv) Client's negligence 
or misconduct. Total indemnification liability is subject to the 
liability cap in Section 6. INDEMNIFICATION IS MUTUAL: Client 
shall indemnify Contractor for claims arising from Client-provided 
materials, specifications, or Client's use of deliverables."

Legal Reasoning: One-way, fault-regardless indemnification is often unenforceable as against public policy. Many jurisdictions prohibit indemnification for the indemnitee's own negligence (especially in construction/services contexts).


8. CONFIDENTIALITY (Clause 8)

Exploitable Language:

"Contractor shall not disclose any information about this engagement, including the terms of this agreement, for 5 years"

Problems:

  • 5 years is excessive for standard consulting
  • Prevents contractor from discussing work for portfolio/references
  • "Terms of this agreement" gag prevents contractor from seeking legal advice or discussing payment disputes
  • Could prevent contractor from defending against legal claims
  • Asymmetrical (no Client confidentiality obligation stated)

Recommended Modification:

"Both parties agree to maintain confidentiality of the other's 
Confidential Information for 3 years following termination. 
'Confidential Information' means non-public technical and business 
information clearly marked as confidential. Exclusions: (a) publicly 
available information; (b) independently developed information; 
(c) information received from third parties without restriction; 
(d) general skills and knowledge. Contractor may: (i) describe the 
general nature of services provided in portfolios/resumes without 
disclosing confidential details; (ii) disclose information as 
required by law; (iii) disclose agreement terms to attorneys, 
accountants, and insurers under confidentiality obligations; 
(iv) use anonymized examples for training/marketing."

Legal Reasoning: Overly broad confidentiality provisions may be void for vagueness or as unreasonable restraints. Preventing disclosure of contract terms may violate public policy regarding wage transparency and access to legal counsel.


9. DISPUTE RESOLUTION (Clause 9)

Exploitable Language:

"Binding arbitration in Client's home jurisdiction, with costs borne by the losing party"

Problems:

  • Forum selection favors Client (Contractor must travel/hire distant counsel)
  • "Loser pays" discourages contractor from pursuing legitimate claims
  • No mediation step before expensive arbitration
  • Arbitration may be more expensive than small claims court
  • No ability to appeal even erroneous decisions

Recommended Modification:

"The parties shall first attempt to resolve disputes through good-
faith negotiation. If unresolved within 30 days, disputes may be 
submitted to non-binding mediation. Either party may pursue claims 
in a court of competent jurisdiction. Venue shall be in the 
jurisdiction where the defendant resides or where the contract was 
primarily performed. Each party bears its own attorneys' fees 
unless a court awards fees to the prevailing party under applicable 
law. For claims under $10,000, either party may elect small claims 
court in their home jurisdiction."

Legal Reasoning: Mandatory arbitration is generally enforceable, but fee-shifting provisions may be unconscionable if they deter reasonable claims. Forum selection clauses must not be unreasonable or unjust (see Bremen v. Zapata, 407 U.S. 1).


⚖️ ADDITIONAL MISSING PROTECTIONS

Add: Independent Contractor Status

"Contractor is an independent contractor, not an employee. 
Contractor is responsible for all taxes, insurance, and benefits. 
Contractor controls the means and methods of work. This Agreement 
does not create a partnership, joint venture, or agency relationship."

Reasoning: Prevents misclassification claims and tax issues.


Add: Warranty Limitation

"Contractor warrants that services will be performed in a 
professional and workmanlike manner consistent with industry 
standards. EXCEPT AS EXPRESSLY PROVIDED, CONTRACTOR MAKES NO 
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF 
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Contractor 
does not warrant that software will be error-free or uninterrupted."

Reasoning: Limits implied warranties that could create unlimited obligations.


Add: Force Majeure

"Neither party shall be liable for delays or failures in 
performance resulting from circumstances beyond reasonable control, 
including acts of God, war, terrorism, pandemic, government action, 
internet/utility failures, or labor disputes."

Add: Entire Agreement & Amendments

"This Agreement constitutes the entire agreement and supersedes 
all prior agreements. Amendments must be in writing signed by both 
parties. No oral modifications are valid."

🎯 NEGOTIATION STRATEGY

  1. Don't sign this as-is - It's unconscionable and potentially unenforceable
  2. Provide redlined version with all suggested changes
  3. Non-negotiable items: Liability cap, payment terms, IP protection, no non-compete
  4. Compromise items: Specific confidentiality terms, reasonable termination notice
  5. Walk away if: Client refuses liability cap, insists on non-compete, won't fix payment terms

📋 SUMMARY OF RISKS IN ORIGINAL CONTRACT

IssueRisk LevelPotential Impact
Unlimited Liability🔴 CRITICALPersonal bankruptcy
Fault-Regardless Indemnity🔴 CRITICALUninsurable exposure
IP Transfer of Pre-existing Work🔴 CRITICALLoss of business assets
Unpaid Work on Termination🟠 HIGHWeeks of free labor
Subjective Payment Withholding🟠 HIGHCash flow crisis
Non-Compete🟠 HIGHLoss of livelihood
90-Day Payment Terms🟡 MEDIUMFinancing burden

Bottom Line: This contract would be considered unconscionable in many jurisdictions and is likely drafted to exploit unsophisticated contractors. No reasonable contractor should sign without substantial modifications. Consider consulting an attorney in your jurisdiction before proceeding.

Adversarial Contract Review

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About Claude Sonnet 4.5

Capabilities

ConversationReasoningCode GenerationAnalysisAgentic Tool Use

Categories

TextCode

Specifications

Provider
Anthropic
Released
2025-09-29
Size
LARGE
Context
200,000 tokens

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