PostGrid vs Sendoso
Zero of twelve models named PostGrid first on the direct prompt; one named Sendoso. Both were named by all twelve models and PostGrid carries 40 labels and Sendoso 45, so the shares are not directly comparable.
Named in one category this edition.
Named in one category this edition.
Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all twelve 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 print page.
By framing
PostGridFirst choices, of twelve modelsSendoso
Across every category in the September 2026 Edition, PostGrid and Sendoso were named in the same answer seventy-six times, of the 110 answers naming PostGrid and the 125 naming Sendoso. In those answers Sendoso took the first choice four times and PostGrid nine.
Every model, every framing
| Model | Direct | Paraphrase | Comparative | Budget-constrained | Scale-constrained | Negative |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | | | |||
| GPT-5.4 mini | | | | | ||
| Gemini 3.5 Flash | | | | | | |
| Perplexity Sonar | | | | | ||
| Grok 4.1 Fast | | | | | | |
| Mistral Small | | | | | ||
| DeepSeek V4 Flash | | | | | | |
| Llama 4 Maverick | | |||||
| Qwen 3.7 Flash | | | | | ||
| Kimi K2 | | | | | | |
| GLM 4.7 FlashX | | | | | ||
| MiniMax M2.5 | | | | | |
PostGrid Sendoso first choice named as an alternative argued againstblank: not namedEach cell is one answer, PostGrid on the left and Sendoso on the right.The direct prompt
Sendoso first, PostGrid not the choice
1 of 12 modelsPostGrid was named in the answer but not as the choice, or not at all.Neither was the first choice, one was named
9 of 12 modelsThe answer put something else first and named one of the two as an alternative.Neither was named
2 of 12 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
PostGrid2%#6 of 9Sendoso2%#7 of 9Sendoso12%#3 of 9PostGrid9%#4 of 9What the models said about PostGrid
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of eight in this category shown.
“Platforms to Avoid on a Tight Budget ... Postgrid — Cheaper API alternative ($0–99/mo), but pricing is often quote-based” DeepSeek V4 Flash · budget prompt · hard negative
“Avoid Lob ($260-$550/month) and PostGrid unless you need API-first development capabilities” Kimi K2 · budget prompt · hard negative
“Platforms to Avoid or Be Cautious About ... 1. Postgrid - Poor Customer Support” GLM 4.7 FlashX · negative prompt · hard negative
“PostGrid is best for revenue ops teams needing API-driven direct mail triggered by CRM events (rated 9.3/10 overall)” MiniMax M2.5 · comparative prompt · first choice
“Choose PostGrid or Lob if you want API-first, developer-controlled automation” Perplexity Sonar · comparative prompt · first choice
“I'd recommend starting with PostGrid due to its: Strong B2B focus” Mistral Small · paraphrase prompt · first choice
What the models said about Sendoso
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of eight in this category shown.
“Platforms with Significant Concerns ... Sendoso (and Postal.io - now acquired by Sendoso) Key Red Flags: Non-refundable prepaid balances that expire” Kimi K2 · negative prompt · hard negative
“Non-refundable preloaded funds: Once you add funds to the platform, you cannot withdraw them. This is a major lock-in risk” DeepSeek V4 Flash · negative prompt · hard negative
“High Costs: Can be expensive, especially for larger teams” GLM 4.7 FlashX · negative prompt · hard negative
“Sendoso is the safest "best overall" pick if you want a broad, mature direct mail automation platform” GPT-5.4 mini · direct prompt · first choice
“Sendoso is the dominant ecosystem for "sending management"” Gemini 3.5 Flash · comparative prompt · first choice
“Sendoso is a top-rated direct mail automation platform” Claude Haiku 4.5 · 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.