Business decisions
Use Claude to Compare Three Supplier Proposals Without Inventing the Missing Terms
Cihan's view: Give Claude clearly labeled proposals, ask for source-linked comparisons and explicit unknowns, then verify the cost assumptions before sending clarification questions.
Three supplier proposals rarely use the same headings. One includes migration, another mentions a setup fee, and a third leaves the support response time unspecified.
Use Claude chat to turn those differences into a comparison table and a clarification list. The artifact is a buying brief—not an AI-selected winner or a supplier commitment.
Evidence label: documentation-based tutorial with fictional quotes and an illustrative acceptance table. The sample base-cost arithmetic was independently checked with Python. This guide does not claim a recorded Claude demonstration, a real purchase, or measured savings.
What you need
A Claude account that can open a normal chat is enough for the pasted example. If you use real files, your account must support those uploads, and your company must approve the material for that AI environment.
Anthropic documents file uploads in Claude, including PDF, DOCX, TXT, and CSV. Its guide describes the + → Add files or photos control. You can paste the following text instead; Projects, Cowork, and connectors are not required.
For scanned documents, check text extraction against the original. A missing price in extracted text is not a zero-price offer.
1. Copy the complete fictional input
The buyer needs a support-knowledge-base service. The spending limit is USD 14,000 for the first 12 months, including setup and migration. There is no approved supplier choice.
Paste these quotes with their source labels intact:
QUOTE A: Northstar
[A01] Monthly subscription: USD 1,200.
[A02] One-time setup: USD 200.
[A03] Setup includes migration and one training session.
[A04] Stated support response: one business day.
[A05] Stated delivery: 10 business days after kickoff.
QUOTE B: BlueHarbor
[B01] Monthly subscription: USD 1,000.
[B02] One-time setup: USD 500.
[B03] Setup includes migration. Training is not specified.
[B04] Stated support response: two business days.
[B05] Stated delivery: 10–15 business days after kickoff.
QUOTE C: Cedar
[C01] Monthly subscription: USD 1,100.
[C02] One-time setup: USD 0.
[C03] Migration is excluded and requires a separate quote.
[C04] Support response time is not specified.
[C05] Stated delivery: seven business days after kickoff.
BUYER REQUIREMENTS
[R01] First-12-month spending limit: USD 14,000, including setup and migration.
[R02] Compare quoted terms only. No purchase has been approved.These are made-up suppliers and terms for practice. Do not treat them as current market prices.
2. Ask Claude for a comparison, not a winner
Paste this after the quotes:
Prepare a supplier-comparison brief using only the labeled quotes
and buyer requirements above. Do not browse or add market knowledge.
Return:
1. A table comparing monthly cost, setup, migration inclusion,
training, support response, and stated delivery.
2. Known first-12-month base cost = 12 × monthly subscription + setup.
Show the calculation and source labels for each supplier.
3. Any extra charges or unspecified terms that prevent an all-in
cost comparison. Never turn an unknown price into zero.
4. A budget check against R01, distinguishing a known overrun from
a base price that still has unpriced extras.
5. Up to five concise supplier clarification questions.
Every material cell needs its source label. Use "not specified" when
there is no stated term. Business days must remain business days.
Do not invent calendar dates, taxes, discounts, contract length,
renewal terms, an SLA guarantee, or a winning supplier.3. Check the cost layer separately
The expected known base costs are:
| Supplier | Calculation | Known 12-month base cost | What the budget check can say |
|---|---|---|---|
| Northstar | 12 × 1,200 + 200 [A01–A02] | USD 14,600 | Already exceeds the USD 14,000 limit [R01]. |
| BlueHarbor | 12 × 1,000 + 500 [B01–B02] | USD 12,500 | Base cost is below the limit; check any additional charges. |
| Cedar | 12 × 1,100 + 0 [C01–C02] | USD 13,200 | Migration is unpriced [C03], so all-in affordability is unresolved. |
This is an illustrative acceptance table, not an actual Claude response.
None of these figures establishes a complete total cost of ownership: taxes, renewal terms, and other possible charges are not stated. In particular, “setup: USD 0” does not mean “migration: free.”
4. Audit the non-price terms
Check three cells against the original input:
- Cedar’s support response must be not specified, not “same-day” or “seven days.” Seven business days is its delivery estimate, not its support response.
- BlueHarbor’s training must remain not specified. Migration inclusion does not imply training inclusion.
- Delivery ranges must remain ranges. Claude must not convert BlueHarbor’s 10–15 business days into a promised kickoff date.
If a cell is unsupported, ask for a corrected table with its source label. Do not accept a general apology in place of the corrected artifact.
5. Turn unknowns into questions you can send
An acceptable question list could include:
- Cedar: What is the migration price, and what does it include?
- Cedar: What support response time is contractually offered?
- BlueHarbor: Is training included, and if not, what would it cost?
- All suppliers: Are taxes or other mandatory first-year charges excluded from these quoted amounts?
- All suppliers: What are the contract length, renewal, and cancellation terms?
Ask Claude to draft a short clarification email, but review it before you send it. Drafting questions is not authorization to contact suppliers or negotiate.
6. Save the reviewed brief
Keep the table, assumptions, unanswered questions, and original quotes together. Once replies arrive, add them as new labeled sources and request an updated comparison. Do not let the model silently replace the original terms.
Troubleshooting
- The model picks the cheapest supplier: ask it to remove the winner and compare only known terms and unresolved extras.
- The table lacks evidence: require a label in every material cell; an attractive table without provenance is not finished.
- A document’s wording is missing: check the source file or paste the relevant passage; do not invite inference.
- The brief invents a legal conclusion: keep contract approval with the appropriate human reviewer.
TRY / SKIP / USE: TRY the fictional quotes first; SKIP automatic supplier selection; USE the reviewed comparison to prepare better questions and a human-owned buying decision.
Sources and next step
Your first useful real-world test is one approved set of proposals and one checked comparison—not a company-wide procurement automation.