# PostGrid Address Verification vs Google Address Validation API: which do AI models recommend for address verification, October 2026

GTM AI Recommendation Index, October 2026 Edition, Address verification tools. One of fourteen models named PostGrid Address Verification first on the direct prompt; zero named Google Address Validation API. Page: https://gtm-ai-index.com/gtm-data/address-verification/postgrid-address-verification-vs-google-address-validation-api/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| PostGrid Address Verification | 8% | #2 of 7 | 3% | 39 | 13 of 14 |
| Google Address Validation API | 4% | #5 of 7 | 10% | 10 | 8 of 14 |

## The direct prompt, model by model

- Claude Haiku 4.5: postgrid address verification first (first choices: PostGrid Address Verification) (alternatives: Informatica Data as a Service, Melissa Address Verification, Smarty)
- GPT-5.4 mini: neither first, one named (first choices: Melissa Global Address Verification) (alternatives: Experian Address Verification, PostGrid Address Verification, Smarty)
- Gemini 3.5 Flash: neither first, one named (first choices: Loqate) (alternatives: Lob, Melissa, PostGrid Address Verification, Smarty)
- Perplexity Sonar: neither first, one named (first choices: Smarty) (alternatives: Loqate, Melissa, PostGrid Address Verification)
- Grok 4.1 Fast: neither first, one named (first choices: Smarty) (alternatives: Melissa, PostGrid Address Verification)
- Mistral Small: neither first, one named (first choices: Experian Address Validation, Melissa Global Address Verification) (alternatives: Loqate, PostGrid Address Verification)
- DeepSeek V4 Flash: neither first, one named (first choices: Smarty) (alternatives: Loqate, Melissa, PostGrid Address Verification)
- GLM 4.7 FlashX: neither first, one named (first choices: Smarty) (alternatives: Experian Address Validation, Melissa, PostGrid Address Verification)
- MiniMax M2.5: neither first, one named (first choices: Smarty) (alternatives: Melissa, PostGrid Address Verification)
- Llama 4 Maverick: neither named
- Qwen 3.7 Flash: neither named (first choices: Smarty) (alternatives: Loqate, Melissa)
- Kimi K2: neither named (first choices: Smarty) (alternatives: Loqate, Melissa Global Address Verification)
- GPT-6 Luna: neither named (first choices: Smarty) (alternatives: Lob, Loqate, Melissa)
- Muse Glimmer 30B: neither named (first choices: Loqate by gbg, Smarty) (alternatives: Melissa Address Verification)

## What the models said about PostGrid Address Verification

- "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 Google Address Validation API

- "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)

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. Comparisons are drawn for the top eight products in each category. Published under CC BY 4.0; the output is the models' output, and nothing here is a recommendation by the index.