Melissa vs Google Address Validation API
Zero of fourteen models named Melissa first on the direct prompt; zero named Google Address Validation API. Melissa was named by fourteen of the fourteen models and Google Address Validation API by eight and Melissa carries 39 labels and Google Address Validation API 10, so the shares are not directly comparable.
Rancho Santa Margarita, United States, founded 1985. Named in one category this edition.
Google Address Validation API
accepted challengerBy Google, Mountain View, California, United States, founded 1998. 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
MelissaFirst choices, of fourteen modelsGoogle Address Validation APIAcross every category in the October 2026 Edition, Melissa and Google Address Validation API were named in the same answer sixteen times, of the 110 answers naming Melissa and the 33 naming Google Address Validation API. In those answers Google Address Validation API took the first choice two times and Melissa one.
Every model, every framing
| Model | DirectGA | ParaphraseGA | ComparativeGA | Budget-constrainedGA | Scale-constrainedGA | NegativeGA |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | |||||
| GPT-5.4 mini | GA | | | |||
| Gemini 3.5 Flash | | | GA | | ||
| Perplexity Sonar | | GA | | | ||
| Grok 4.1 Fast | | | | |||
| Mistral Small | GA | |||||
| DeepSeek V4 Flash | | | GA | | ||
| Llama 4 Maverick | | |||||
| Qwen 3.7 Flash | | | | | ||
| Kimi K2 | | GA | GA | |||
| GLM 4.7 FlashX | | | ||||
| MiniMax M2.5 | | GA | GA | | ||
| GPT-6 Luna | | GA | ||||
| Muse Glimmer 30B | |
MelissaGA Google Address Validation API first choice named as an alternative argued againstblank: not namedEach cell is one answer, Melissa on the left and Google Address Validation API on the right.The direct prompt
Neither was the first choice, one was named
8 of 14 modelsThe answer put something else first and named one of the two as an alternative.Neither was named
6 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
Melissa4%#3 of 6Melissa8%#3 of 7Melissa13%#2 of 8What 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
What the models said about Google Address Validation API
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Four of five in this category shown.
“Generally not CASS-certified, so less ideal for postal compliance needs” DeepSeek V4 Flash · comparative prompt · soft negative
“I'd typically recommend starting with Google Address Validation or Melissa” MiniMax M2.5 · paraphrase prompt · first choice
“1. Google Address Validation API — Best Free Ongoing Option” Kimi K2 · budget prompt · first choice
“U.S. ecommerce checkout: Compare Smarty and Google” GPT-6 Luna · comparative 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.