PostGrid Address Verification vs Melissa
One of fourteen models named PostGrid Address Verification first on the direct prompt; zero named Melissa. PostGrid Address Verification was named by thirteen of the fourteen models and Melissa by fourteen and both carry 39 labels, so the shares below are directly comparable.
Named in one category this edition.
Rancho Santa Margarita, United States, founded 1985. Named in one category this edition.
Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all fourteen models, for a mid-market B2B company; rank is within the category; every quote names the model and the prompt it came from. Both figures come from the address verification tools page.
By framing
PostGrid Address VerificationFirst choices, of fourteen modelsMelissa
Across every category in the October 2026 Edition, PostGrid Address Verification and Melissa were named in the same answer fifty-eight times, of the 115 answers naming PostGrid Address Verification and the 110 naming Melissa. In those answers Melissa took the first choice four times and PostGrid Address Verification six.
Every model, every framing
| Model | Direct | Paraphrase | Comparative | Budget-constrained | Scale-constrained | Negative |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | | | | ||
| GPT-5.4 mini | | | | | ||
| Gemini 3.5 Flash | | | | | ||
| Perplexity Sonar | | | | | ||
| Grok 4.1 Fast | | | | | | |
| Mistral Small | | | ||||
| DeepSeek V4 Flash | | | | | ||
| Llama 4 Maverick | | |||||
| Qwen 3.7 Flash | | | | | ||
| Kimi K2 | | | ||||
| GLM 4.7 FlashX | | | | | ||
| MiniMax M2.5 | | | | | ||
| GPT-6 Luna | | | ||||
| Muse Glimmer 30B | | |
PostGrid Address Verification Melissa first choice named as an alternative argued againstblank: not namedEach cell is one answer, PostGrid Address Verification on the left and Melissa on the right.The direct prompt
PostGrid Address Verification first, Melissa not the choice
1 of 14 modelsMelissa was named in the answer but not as the choice, or not at all.Neither was the first choice, one was named
10 of 14 modelsThe answer put something else first and named one of the two as an alternative.Neither was named
3 of 14 modelsThe answer made no first choice from these two in this category.Bold names in an answer are the products the judge labeled a first choice; a model naming several gives each of them that label. The full answer text for every row is in the record.
By buyer segment
PostGrid Address Verification12%#2 of 6Melissa4%#3 of 6PostGrid Address Verification8%#2 of 7Melissa8%#3 of 7Melissa13%#2 of 8PostGrid Address Verification6%#4 of 8What the models said about PostGrid Address Verification
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Four of five in this category shown.
“PostGrid has been flagged in independent reviews for specific reliability issues.” GLM 4.7 FlashX · negative prompt · soft negative
“PostGrid is a strong option for SaaS and B2B teams because it combines address verification, autocomplete, bulk list cleanup, international coverage, API access, and dashboard-based workflows in one platform.” Claude Haiku 4.5 · direct prompt · first choice
“PostGrid's pay-as-you-go model allows you to get started without investing anything, which is ideal for companies with truly limited budgets” Claude Haiku 4.5 · budget prompt · first choice
“Best budget option (US/Canada): PostGrid - $20/mo for 2,000 lookups” Muse Glimmer 30B · budget prompt · first choice
What the models said about Melissa
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Five of six in this category shown.
“General cautions for all address verification tools (e.g., Smarty, Melissa, Quadient, Shufti Pro, SumSub, Veriff, DataFlow)” Grok 4.1 Fast · negative prompt · soft negative
“Melissa is generally heavier and more complex to implement. It is less of an "add-on" tool for a website” Qwen 3.7 Flash · comparative prompt · soft negative
“Melissa - Offers a comprehensive address verification API with features such as real-time address validation, standardization, and enrichment.” Llama 4 Maverick · paraphrase prompt · first choice
“The Industry Standards (High accuracy, widely used): Smarty (formerly SmartyStreets), Loqate (Onbuka), Melissa (DataBox).” Qwen 3.7 Flash · scale prompt · first choice
“Melissa offers the best free tier for small businesses needing additional validation features” MiniMax M2.5 · budget prompt · first choice
Comparisons are drawn for the top eight products in each category, each against each. The output is the models' output; nothing here is a recommendation by the index.