# Thanks.io vs PostGrid: which do AI models recommend for direct mail, October 2026

GTM AI Recommendation Index, October 2026 Edition, Print. Zero of fourteen models named Thanks.io first on the direct prompt; one named PostGrid. Page: https://gtm-ai-index.com/marketing/print/thanks-io-vs-postgrid/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Thanks.io | 4% | #6 of 10 | 0% | 11 | 10 of 14 |
| PostGrid | 2% | #7 of 10 | 32% | 38 | 13 of 14 |

## The direct prompt, model by model

- Perplexity Sonar: postgrid first (first choices: PostGrid) (alternatives: Reachdesk)
- Gemini 3.5 Flash: neither first, one named (first choices: Reachdesk) (alternatives: Alyce, Lob, PostGrid, Postal, Postalytics, Sendoso)
- GLM 4.7 FlashX: neither first, one named (first choices: Postalytics) (alternatives: Lob, PostGrid, Postal, Sendoso)
- Claude Haiku 4.5: neither named (first choices: Postalytics) (alternatives: Lob, Sendoso)
- GPT-5.4 mini: neither named (first choices: Sendoso) (alternatives: PFL)
- Grok 4.1 Fast: neither named (first choices: Sendoso) (alternatives: Lob, PostGrid Print & Mail)
- Mistral Small: neither named (first choices: Postie) (alternatives: PFL, Postalytics)
- DeepSeek V4 Flash: neither named (first choices: Postalytics) (alternatives: Lob, PFL, Postal, Postie, Sendoso)
- Llama 4 Maverick: neither named (first choices: Postie) (alternatives: Postal)
- Qwen 3.7 Flash: neither named (first choices: Sendoso) (alternatives: CIENCE, Cobro, Lob, PebblePost)
- Kimi K2: neither named (first choices: Lob, Postal) (alternatives: PFL, Postalytics)
- MiniMax M2.5: neither named (first choices: Postalytics) (alternatives: PFL Direct Mail Platform)
- GPT-6 Luna: neither named (first choices: Postalytics) (alternatives: Lob, Postal, Reachdesk)
- Muse Glimmer 30B: neither named (first choices: PFL - Printing For Less) (alternatives: Lob, Postal, Postalytics, Reachdesk, Sendoso)

## What the models said about Thanks.io

- "Click2Mail or thanks.io (pay-as-you-go plan) stand out as the best direct mail automation platforms" (Grok 4.1 Fast, budget prompt, first choice)
- "Thanks.io is the gold standard for low-budget operations." (Gemini 3.5 Flash, budget prompt, first choice)

## What the models said about PostGrid

- "here are the direct mail automation platforms you should avoid or approach with caution... 2. PostGrid ... Faulty tracking" (Kimi K2, negative prompt, hard negative)
- "Postgrid is frequently cited in reviews for having significant operational flaws, leading to a low Trustpilot rating of 2.9/5." (GLM 4.7 FlashX, negative prompt, hard negative)
- "Platforms to Approach with Caution or Avoid: PostGrid ... Best Avoid If: You need reliable support, tracking, or non-US mailing." (Grok 4.1 Fast, negative prompt, hard negative)
- "PostGrid and Lob are strongest for pure direct mail automation, with PostGrid favored for API-centric workflows and Lob for marketing team usability." (MiniMax M2.5, comparative prompt, first choice)
- "PostGrid is the safest "best direct mail automation platform" pick for a mid-market B2B company" (Perplexity Sonar, direct prompt, first choice)
- "with PostGrid and Lob most often cited for API-first print-and-mail automation" (Perplexity Sonar, 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.