47% of first choices, clear leader.
The floor is 11 points of share, measured: how far the models move a leader on their own when the same questions are asked twice with nothing changed. A larger change is movement; a smaller one is noise, and both are shown. Movement is read over the twelve models both editions asked; GPT-6 Luna, Muse Glimmer 30B joined this edition and are in the standing but not yet in the comparison. How the floor is measured
Google Address Validation API is made by Google, whose model Gemini 3.5 Flash is in the set. On the four share prompts that model made it the first choice zero times of 4; the other thirteen models two times of 52. Lab treatment is defined on the method page; the row is marked, not excluded.
Every product with at least 10 labels here, on both axes. The 30% line names a quadrant, not the verdict above: that one needs more than 40%.
“here are address verification tools you should avoid or be cautious about: ## Google Maps Address Validation API” Claude Haiku 4.5, negative prompt
“The USPS officially retired the legacy Web Tools platform on January 25, 2026... completely non-functional.” Gemini 3.5 Flash, negative prompt
“Avoid: **getAddress.io** (high-risk / legally compromised)” DeepSeek V4 Flash, negative prompt
“as a substitute for postal validation. They compile personal information from brokers and public records; a match doesn’t establish that an address is current or deliverable.” GPT-6 Luna, negative prompt
75 of 84 answers in this category came back with a source list, from 14 of 14 models: citations where the model returns them, or the search results it consulted. 1017 links across 182 sites, every framing counted. Ranked by the number of answers carrying the site or page. None of the 252 answers across every segment cited this index's own page for the category.
The ten pages named in the most answers, by full address. A page here is one the models returned with a recommendation, not one the index endorses.
| Company and products | Share | Own site cited | Name searches, Google | AI search demand, est. | Organic visits | Paid search a month, est. | Google ads, last 30 days | Best Google position |
|---|---|---|---|---|---|---|---|---|
| Smarty smarty.com | 47% | 182 | 12,100 | 6,510 | 503,269 | 120 | 2 | |
| Melissa melissa.com Melissa 8%, Melissa Global Address Verification 4%, Melissa Address Verification 2% | 13% | 105 | 135,000 | 84,957 | 197,334 | 29 | 5 | |
| PostGrid Address Verification postgrid.com | 8% | 115 | 90 | 1 | 196,042 | $765 | 120 | |
| Loqate loqate.com | 4% | 90 | 720 | 17 | 127,878 | 52 | ||
| Google parent site Google Address Validation API 4%, Google Address Validation 0% | 4% | 32 | 720 | 24 | ||||
| Lob Address Verification | 2% | |||||||
| Experian experian.com Experian Address Validation 2%, Experian Data Quality 0% | 2% | 39 | 2,240,000 | 11,048 | 11,578,864 company | $1,386 | 96 | 9 |
| AddressZen addresszen.com | 2% | 4 | ||||||
| Google Maps Platform | 2% | |||||||
| Geocodio | 2% |
Google's top ten for the two searches hold 17 sites; 1 of them are among the sites the models cited here (smarty.com). The first result for “address verification tool” is tools.usps.com.
| Prompt | Model | Version string | Time (UTC) | Searched | Sources | Latency |
|---|---|---|---|---|---|---|
| Direct recommendation | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-05 00:10 | yes | 16 | 7 s |
| Direct recommendation | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-05 00:17 | yes | 4 | 6 s |
| Direct recommendation | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-05 00:44 | yes | 14 | 28 s |
| Direct recommendation | Perplexity Sonar | sonar | 2026-10-05 00:10 | yes | 18 | 5 s |
| Direct recommendation | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-04 22:22 | yes | 23 | 12 s |
| Direct recommendation | Mistral Small | mistral/mistral-small via mistral | 2026-10-05 01:00 | yes | 14 | 7 s |
| Direct recommendation | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-04 23:44 | yes | 23 | 42 s |
| Direct recommendation | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-05 00:45 | yes | 5 | 2 s |
| Direct recommendation | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-05 00:19 | no | 0 | 24 s |
| Direct recommendation | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-04 23:43 | yes | 14 | 19 s |
| Direct recommendation | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-04 23:22 | yes | 13 | 56 s |
| Direct recommendation | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-04 23:37 | yes | 21 | 33 s |
| Direct recommendation | GPT-6 Luna | gpt-6-luna | 2026-10-04 22:24 | yes | 4 | 13 s |
| Direct recommendation | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-05 00:54 | yes | 14 | 16 s |
| Paraphrase | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-05 00:42 | yes | 16 | 9 s |
| Paraphrase | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-05 00:37 | yes | 3 | 4 s |
| Paraphrase | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-05 00:53 | yes | 7 | 22 s |
| Paraphrase | Perplexity Sonar | sonar | 2026-10-05 00:42 | yes | 19 | 2 s |
| Paraphrase | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-04 22:23 | yes | 23 | 9 s |
| Paraphrase | Mistral Small | mistral/mistral-small via mistral | 2026-10-05 00:56 | yes | 5 | 6 s |
| Paraphrase | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-05 00:19 | yes | 24 | 45 s |
| Paraphrase | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-04 22:10 | yes | 5 | 2 s |
| Paraphrase | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-04 23:43 | yes | 5 | 27 s |
| Paraphrase | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-04 23:06 | yes | 10 | 12 s |
| Paraphrase | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-04 22:58 | yes | 23 | 31 s |
| Paraphrase | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-05 00:47 | yes | 5 | 16 s |
| Paraphrase | GPT-6 Luna | gpt-6-luna | 2026-10-05 00:30 | yes | 5 | 17 s |
| Paraphrase | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-04 22:10 | yes | 15 | 19 s |
| Comparative | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-05 00:21 | yes | 10 | 9 s |
| Comparative | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-04 23:37 | yes | 4 | 7 s |
| Comparative | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-04 23:47 | yes | 14 | 25 s |
| Comparative | Perplexity Sonar | sonar | 2026-10-04 22:22 | yes | 16 | 6 s |
| Comparative | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-04 23:23 | yes | 22 | 9 s |
| Comparative | Mistral Small | mistral/mistral-small via mistral | 2026-10-04 23:17 | yes | 9 | 8 s |
| Comparative | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-04 22:33 | yes | 21 | 52 s |
| Comparative | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-05 00:42 | yes | 5 | 2 s |
| Comparative | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-05 00:10 | no | 0 | 35 s |
| Comparative | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-05 00:09 | yes | 19 | 31 s |
| Comparative | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-04 23:42 | yes | 23 | 92 s |
| Comparative | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-04 23:45 | yes | 10 | 35 s |
| Comparative | GPT-6 Luna | gpt-6-luna | 2026-10-04 22:25 | yes | 6 | 19 s |
| Comparative | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-04 22:20 | yes | 13 | 21 s |
| Budget constrained | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-05 00:15 | yes | 9 | 6 s |
| Budget constrained | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-05 00:08 | yes | 3 | 6 s |
| Budget constrained | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-05 00:27 | yes | 12 | 22 s |
| Budget constrained | Perplexity Sonar | sonar | 2026-10-05 00:16 | yes | 15 | 3 s |
| Budget constrained | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-05 00:14 | yes | 23 | 9 s |
| Budget constrained | Mistral Small | mistral/mistral-small via mistral | 2026-10-05 00:32 | yes | 5 | 5 s |
| Budget constrained | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-04 22:57 | yes | 23 | 29 s |
| Budget constrained | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-04 22:19 | yes | 5 | 2 s |
| Budget constrained | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-05 00:21 | no | 0 | 28 s |
| Budget constrained | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-04 23:27 | yes | 14 | 32 s |
| Budget constrained | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-04 23:47 | yes | 13 | 88 s |
| Budget constrained | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-04 23:45 | yes | 13 | 34 s |
| Budget constrained | GPT-6 Luna | gpt-6-luna | 2026-10-04 23:57 | yes | 3 | 9 s |
| Budget constrained | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-04 23:06 | yes | 13 | 15 s |
| Scale constrained | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-05 00:01 | no | 0 | 12 s |
| Scale constrained | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-04 23:50 | no | 0 | 6 s |
| Scale constrained | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-04 22:35 | yes | 10 | 25 s |
| Scale constrained | Perplexity Sonar | sonar | 2026-10-04 23:52 | yes | 19 | 5 s |
| Scale constrained | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-05 00:19 | yes | 12 | 9 s |
| Scale constrained | Mistral Small | mistral/mistral-small via mistral | 2026-10-05 00:32 | no | 0 | 8 s |
| Scale constrained | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-04 23:09 | yes | 22 | 43 s |
| Scale constrained | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-04 22:44 | yes | 5 | 4 s |
| Scale constrained | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-04 23:32 | no | 0 | 27 s |
| Scale constrained | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-04 23:13 | yes | 19 | 56 s |
| Scale constrained | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-04 23:07 | yes | 22 | 48 s |
| Scale constrained | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-04 22:12 | yes | 5 | 13 s |
| Scale constrained | GPT-6 Luna | gpt-6-luna | 2026-10-04 23:18 | yes | 2 | 14 s |
| Scale constrained | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-05 00:29 | yes | 13 | 16 s |
| Negative framing | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-04 22:58 | yes | 35 | 14 s |
| Negative framing | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-04 22:32 | no | 0 | 5 s |
| Negative framing | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-04 23:03 | yes | 17 | 26 s |
| Negative framing | Perplexity Sonar | sonar | 2026-10-04 22:51 | yes | 20 | 4 s |
| Negative framing | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-05 00:34 | yes | 23 | 12 s |
| Negative framing | Mistral Small | mistral/mistral-small via mistral | 2026-10-05 00:26 | yes | 5 | 6 s |
| Negative framing | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-04 23:40 | yes | 19 | 46 s |
| Negative framing | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-04 22:39 | yes | 5 | 2 s |
| Negative framing | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-05 00:23 | no | 0 | 28 s |
| Negative framing | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-04 23:36 | yes | 24 | 22 s |
| Negative framing | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-05 00:12 | yes | 20 | 59 s |
| Negative framing | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-05 00:05 | yes | 19 | 30 s |
| Negative framing | GPT-6 Luna | gpt-6-luna | 2026-10-04 23:27 | yes | 5 | 16 s |
| Negative framing | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-05 00:41 | yes | 25 | 26 s |
Every judgment call made between the raw labels and the numbers above, listed so it is visible and reversible.
ShowHideAlready following? Everything you follow, with a stop for each.