# Address verification tools: what AI models recommend, October 2026

Gane Index, October 2026 Edition. Asked as "address verification tool" and as "address validation API", six framings each, to fourteen models with search on, on behalf of a mid-market B2B company. Added to the October 2026 Edition on October 4, 2026. Page: https://www.gane.ai/index/gtm/gtm-data/address-verification/2026-10

This is the permanent record of the October 2026 Edition, published October 1, 2026 and superseded since. The current standing: https://www.gane.ai/index/gtm/gtm-data/address-verification/index.md

**Standing:** Smarty leads with 47% of first choices; verdict clear leader. 53 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| Rank | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | [Smarty](https://www.gane.ai/index/gtm/vendors/smarty/index.md) | 47% | 0% | 61 |
| 2 | [Melissa Global Address Verification](https://www.gane.ai/index/gtm/vendors/melissa-global-address-verification/index.md) | 13% | 5% | 55 |
| 3 | [PostGrid Address Verification](https://www.gane.ai/index/gtm/vendors/postgrid-address-verification/index.md) | 8% | 3% | 39 |
| 4 | [Loqate](https://www.gane.ai/index/gtm/vendors/loqate/index.md) | 4% | 0% | 33 |
| 5 | [Google Address Validation API](https://www.gane.ai/index/gtm/vendors/google-address-validation-api/index.md) | 4% | 11% | 19 |
| 6 | [Experian Address Validation](https://www.gane.ai/index/gtm/vendors/experian-address-validation/index.md) | 2% | 8% | 13 |
| 19 | [Lob](https://www.gane.ai/index/gtm/vendors/lob/index.md) | 0% | 6% | 18 |

Rank is by share of first choices among all 98 products named; products with the same share are tied, and the order among them carries no meaning. The table lists those with at least 10 labels.

## Each model's first choice on the direct prompt

- Claude Haiku 4.5: PostGrid Address Verification; alternatives Informatica Data as a Service, Melissa Global Address Verification, Smarty
- GPT-5.4 mini: Melissa Global Address Verification; alternatives Experian Address Verification, PostGrid Address Verification, Smarty
- Gemini 3.5 Flash: Loqate; alternatives Lob, Melissa Global Address Verification, PostGrid Address Verification, Smarty
- Perplexity Sonar: Smarty; alternatives Loqate, Melissa Global Address Verification, PostGrid Address Verification
- Grok 4.20: Smarty; alternatives Melissa Global Address Verification, PostGrid Address Verification
- Mistral Small: Experian Address Validation, Melissa Global Address Verification; alternatives Loqate, PostGrid Address Verification
- DeepSeek V4 Flash: Smarty; alternatives Loqate, Melissa Global Address Verification, PostGrid Address Verification
- Llama 4 Maverick: no first choice
- Qwen 3.7 Flash: Smarty; alternatives Loqate, Melissa Global Address Verification
- Kimi K2: Smarty; alternatives Loqate, Melissa Global Address Verification
- GLM 4.7 FlashX: Smarty; alternatives Experian Address Validation, Melissa Global Address Verification, PostGrid Address Verification
- MiniMax M2.5: Smarty; alternatives Melissa Global Address Verification, PostGrid Address Verification
- GPT-6 Luna: Smarty; alternatives Lob, Loqate, Melissa Global Address Verification
- Muse Glimmer 30B: Loqate by gbg, Smarty; alternatives Melissa Global Address Verification

## Sources the answers cite

75 of 84 answers came back with a source list, from 14 of 14 models. Sites named in the most answers:

- smarty.com: 50 answers, 122 citations
- melissa.com: 43 answers, 61 citations
- guideflow.com: 42 answers, 42 citations
- postgrid.com: 37 answers, 58 citations
- g2.com: 36 answers, 55 citations
- opencart.com: 28 answers, 28 citations
- radar.com: 24 answers, 25 citations
- apollotechnical.com: 24 answers, 24 citations

Pages named in the most answers:

- https://guideflow.com/blog/address-verification-software (42 answers)
- https://melissa.com/address-experts/best-address-verification-apis-complete-comparison (27 answers)
- https://apollotechnical.com/address-verification-apis-for-saas-and-b2b-marketing-teams (24 answers)
- https://radar.com/blog/address-verification-software (24 answers)
- https://opencart.com/blog/top-12-address-verification-apis-and-software-compared-for-2026?page=4 (23 answers)
- https://shuftipro.com/blog/best-address-verification-software (19 answers)
- https://smarty.com/compare/google-address-validation-alternatives (18 answers)
- https://postgrid.com/address-verification-software/best-address-verification-software (16 answers)
- https://thectoclub.com/tools/best-address-verification-software (16 answers)
- https://batchdata.io/blog/best-address-verification-apis-2026-complete-comparison-guide (15 answers)

## Warned against

- Google Maps Address Validation API: 3 of 5 labels negative. "here are address verification tools you should avoid or be cautious about:

## Google Maps Address Validation API" (Claude Haiku 4.5, negative prompt)
- USPS Web Tools: 3 of 3 labels negative. "The USPS officially retired the legacy Web Tools platform on January 25, 2026... completely non-functional." (Gemini 3.5 Flash, negative prompt)
- Melissa Global Address Verification: 3 of 55 labels negative. "Melissa's address verification is slow, with their bulk validation only capable of processing tens to hundreds of addresses per second." (Claude Haiku 4.5, negative prompt)
- getaddress.io: 2 of 2 labels negative. "Avoid: getAddress.io (high-risk / legally compromised)" (DeepSeek V4 Flash, negative prompt)

## Record

- Method: https://www.gane.ai/index/gtm/methodology
- License: CC BY 4.0. Cite as Gane Index, October 2026 Edition, www.gane.ai/index/gtm.