Email deliverability and testing tools for enterprise buyers
Asked as “email deliverability tool”, and as “inbox placement and email testing platform”, on behalf of an enterprise B2B company. 49 first choices recorded across the direct, paraphrase, budget and scale prompts, fourteen models each. Added to the October 2026 Edition on October 4, 2026; its answers are read by the distilled judge (ai-indexes-judge-qwen3-14b-run3), not the claude-opus-5 judge of the earlier categories: how the two compare.
Standing · first-choice share
45%
Clear leader
45Validity Everest06Everest06Instantly43others
45% of first choices, clear leader.
By buyer segment
The same question asked on behalf of a different buyer. Each standing is computed within its segment; they sit side by side and are never added together.
The standing
Share is the count of first choices across the direct, paraphrase, budget and scale prompts, over all fourteen models, for an enterprise B2B company. Ordered by share.
ProductFirst-choice shareNegative rateLabelsQuadrant
Show the six products at 0%, ordered by negative rate
Bars are the share of first choices, 0 to 100Every product with at least 10 labels here. Every product name links to its product page.
Google Postmaster Tools 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 zero times of 52. Lab treatment is defined on the method page; the row is marked, not excluded.
All twenty-eight head-to-head pages: the top eight products, each against each
GlockApps vs Mail-TesterGlockApps vs FolderlyGlockApps vs Microsoft SNDSGlockApps vs Validity EverestGoogle Postmaster Tools vs MailReachGoogle Postmaster Tools vs MXToolboxGoogle Postmaster Tools vs Mail-TesterGoogle Postmaster Tools vs FolderlyGoogle Postmaster Tools vs Microsoft SNDSGoogle Postmaster Tools vs Validity EverestMailReach vs MXToolboxMailReach vs Mail-TesterMailReach vs FolderlyMailReach vs Microsoft SNDSMailReach vs Validity EverestMXToolbox vs Mail-TesterMXToolbox vs FolderlyMXToolbox vs Microsoft SNDSMXToolbox vs Validity EverestMail-Tester vs FolderlyMail-Tester vs Microsoft SNDSMail-Tester vs Validity EverestFolderly vs Microsoft SNDSFolderly vs Validity EverestMicrosoft SNDS vs Validity Everest
Recommended versus criticized
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%.
Criticized challengerCriticized default
Negative label rate →
01
02
03
04
05
06
07
08G09
10M11
12
13
14Accepted challengerEndorsed leader
0%First-choice share → · lines at 30% share and 25% negative60%
Key
01Validity Everest45%
Validity Everest45%02Litmus6%
Litmus6%03Mailgun6%
Mailgun6%04SendGrid6%
SendGrid6%05GlockApps2%
GlockApps2%06Folderly2%
Folderly2%07Inbox Monster2%
Inbox Monster2%08MailReach2%
MailReach2%09Google Postmaster Tools0%
10ZeroBounce0%
ZeroBounce0%11Microsoft SNDS0%
12Email on Acid0%
Email on Acid0%13Mailtrap0%
Mailtrap0%14MXToolbox0%
MXToolbox0%What they warned about
Seven of fourteen models held their first choice under the paraphrase. GPT-5.4 mini, Gemini 3.5 Flash, Mistral Small, Llama 4 Maverick, Qwen 3.7 Flash, MiniMax M2.5 and GPT-6 Luna changed. A high negative share on a product with few labels is a warning. A low share on a product with many labels is salience, not sentiment.
Mail-Tester83%
5 of 6 labels negative · 5 of 14 models · 2 hard negative
“This tool has reportedly become less accurate and reliable over time, with some long-term users noting it "won't even load a response"” Claude Haiku 4.5, negative prompt
MXToolbox45%
5 of 11 labels negative · 5 of 14 models · 1 hard negative
“**Why Avoid**: Diagnostic-only, no testing/simulation of actual delivery or placement.” Grok 4.1 Fast, negative prompt
Validity Everest11%
5 of 47 labels negative · 5 of 14 models
“premium enterprise deliverability suites like **Validity Everest** scale cost based on overall email send volume, which can lead to high and unpredictable overage fees” Gemini 3.5 Flash, budget prompt
MailReach24%
4 of 17 labels negative · 4 of 14 models · 2 hard negative
“Consumer-Grade "Warmup" & Low-Volume Tools **Examples:** *Mailreach (standard plans), Lemlist warmup, Instantly warmup features.* **Why Avoid/Be Cautious:**” Qwen 3.7 Flash, negative prompt
What they cite
Citations exist only for the models that return a source list: fourteen of the fourteen in this edition, and all six flagship models on the expanded tier.
Sites the answers cite
80 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. 1199 links across 249 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.
vendor site · Instantly40 answers · 72 citations · 12 models
vendor site · Amplemarket32 answers · 34 citations · 10 models
vendor site · InboxArmy28 answers · 28 citations · 11 models
vendor site · Sender28 answers · 28 citations · 10 models
vendor site · Mailtrap27 answers · 32 citations · 10 models
27 answers · 32 citations · 11 models
vendor site · Saleshandy25 answers · 25 citations · 10 models
vendor site · Prospeo22 answers · 29 citations · 9 models
vendor site · Guideflow21 answers · 26 citations · 9 models
19 answers · 24 citations · 11 models
19 answers · 22 citations · 9 models
vendor site · MyEmailVerifier19 answers · 19 citations · 9 models
Pages the answers cite
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.
32 answers · 10 models
27 answers · 11 models
27 answers · 11 models
25 answers · 9 models
24 answers · 11 models
23 answers · 10 models
19 answers · 9 models
19 answers · 9 models
17 answers · 10 models
17 answers · 9 models
Search against answers
Each company's standing in the answers beside its site's footprint in Google search, one row a site: the products the models named on it with their shares, and the share they add up to; monthly searches on Google, and DataForSEO's estimate of AI search demand (modeled from search signals, directional, not a count of queries to any assistant), for the most-searched of the company's and its products' names (the name is in each row's hover text); estimated monthly organic visits to the site; and its best position in Google's top ten for “best email deliverability tool”, “email deliverability tool”. US estimates from DataForSEO and Google's Ads Transparency Center. A small company's site, or a mid-sized company's site for its flagship, is marked company; a product on a large parent's site (Google, Microsoft) has no site figures. A column with no figures for this category is left out, and an empty cell means none were seen, not none exist. Two measurements side by side: neither is read as the cause of the other.
| 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 |
|---|---|---|---|---|---|---|---|---|
| Validity validity.com Validity Everest 45%, Validity Engage 6% | 51% | 88 | 140 | 0 | 24,467 company | $264 | 120 | |
| Litmus litmus.com | 6% | 73 | 12,100 | 2,310 | 38,533 | 15 | ||
| Sinch mailgun.com Mailgun 6%, Mailgun Optimize 0% | 6% | 38 | 18,100 | 344 | 55,627 | $46 | 66 | |
| Everest | 6% | |||||||
| Twilio sendgrid.com SendGrid 6% | 6% | 40 | 135,000 | 4,343 | 22,206 | |||
| Instantly instantly.ai | 6% | 106 | 74,000 | 87,944 | 59,881 | $986 | 17 | |
| Sender sender.net | 4% | 105 | 9,900 | 10,349 | 69,078 | 13 | ||
| GlockApps glockapps.com | 2% | 148 | 1,600 | 3 | 8,647 | 1 | ||
| Folderly folderly.com | 2% | 52 | 880 | 11 | 2,464 | 8 | ||
| Inbox Monster inboxmonster.com | 2% | 11 | 720 | 4 | 730 | 7 |
Google's top ten for the two searches hold 17 sites; 0 of them are among the sites the models cited here. The first result for “best email deliverability tool” is devopsschool.com.
How they answered
Six framings of the same buying question, each sent to every model in a fresh session with search on. One row per model, so a row shows whether it held its answer under rewording, what it named when cost was the constraint, and what it argued against. Computed from the raw judge labels.ShowHide
How they answered
Six framings of the same buying question, each sent to every model in a fresh session with search on. One row per model, so a row shows whether it held its answer under rewording, what it named when cost was the constraint, and what it argued against. Computed from the raw judge labels.
ShowHideModelDirect“What is the best email deliverability tool for an enterprise B2B company?”Paraphrase“Which inbox placement and email testing platform would you recommend to a large B2B company with thousands of employees?”Comparative“What are the top enterprise-grade email deliverability and testing tools and how do they differ?”Budget-constrained“What is the best email deliverability tool for a large company that needs predictable total cost across thousands of users?”Scale-constrained“We are a 5,000 person company with SSO, SOC 2 and procurement review requirements evaluating an email deliverability tool. What should we look at?”Negative“Which email deliverability and testing tools should a large enterprise avoid or be cautious about?”
Claude Haiku 4.5Validity EverestValidity EverestHeldagainst: MailReachValidity EverestMailgun, TrulyInboxno first choiceagainst: MXToolbox, Mail-Tester, Mailtrap, Validity Everest
Two alternatives
Salesforce, Validity EngageOne alternative
FolderlyThree alternatives
GlockApps, Litmus, PowerDMARCTwo alternatives
Everest, PabblyGPT-5.4 miniValidity EverestValidity EngageChangedMailgun OptimizeMailgun, SendGridno first choicenothing named
Two alternatives
Inbox Monster, ZeroBounceOne alternative
Inbox MonsterFive alternatives
Email on Acid, Everest, GlockApps, Litmus, Validity EverestTwo alternatives
Mailtrap, Validity EverestGemini 3.5 FlashValidity EngageLitmusChangedEverestInstantly, Smartleadagainst: HubSpot, Kickbox, Outreach, Salesloft, Validity Everestno first choicenothing named
Nine alternatives
GlockApps, Google Postmaster Tools, Instantly, MailReach, Microsoft SNDS, Sinch Mailgun Optimize, Smartlead, Warmy.io, ZeroBounceFour alternatives
GlockApps, Inbox Monster, Validity Engage, Validity EverestSix alternatives
Email on Acid, GlockApps, Inbox Monster, Litmus, Mailgun, SendGridFour alternatives
Allegrow, EasyDMARC, GlockApps, PowerDMARCPerplexity SonarValidity EverestValidity EverestHeldValidity EverestEverestno first choiceagainst: Instantly, Loops, Mailslurp, Warmforge
Two alternatives
Folderly, MailReachOne alternative
GlockAppsFive alternatives
Folderly, GlockApps, Litmus, Mailgun Optimize, SocketLabsGrok 4.1 FastValidity EverestValidity EverestHeldValidity Everestagainst: MailReachSocketLabsagainst: Amazon SES, Mailgun, SendGridSendGridagainst: Email on Acid, GlockApps, Litmus, MXToolbox, Mail-Tester
Five alternatives
Folderly, GlockApps, MailReach, SocketLabs, ZeroBounceTwo alternatives
GlockApps, Inbox MonsterFour alternatives
Email on Acid, GlockApps, Litmus, SendForensicsThree alternatives
Brevo, Postmark, Salesforce MCFive alternatives
GlockApps, Mailgun, Mailtrap, Postmark, Validity EverestMistral SmallValidity EverestEverest, GlockAppsChangedno first choiceValidity Everestno first choiceagainst: Litmusnothing named
Four alternatives
Folderly, GlockApps, Google Postmaster Tools, LitmusOne alternative
MailReachTwo alternatives
Amazon SES, AmplemarketDeepSeek V4 FlashValidity EverestValidity EverestHeldValidity Everestagainst: SendGridInstantlyagainst: Validity EverestMailgunagainst: Amazon SESagainst: Folderly, Lemwarm, Litmus, MXToolbox, Mail-Tester, MailReach, Mailgun, Sinch, Warmy
Four alternatives
Amplemarket, Folderly, GlockApps, LitmusThree alternatives
Email on Acid, Inbox Monster, LitmusSix alternatives
Email on Acid, GlockApps, Litmus, Mailgun, Mailtrap, SparkPostOne alternative
SmartleadFour alternatives
Everest, Postmark, SendGrid, SocketLabsLlama 4 MaverickSenderMailReachChangedno first choiceno first choiceno first choicenothing named
Three alternatives
Amplemarket, Google Postmaster Tools, Mail-TesterFour alternatives
Folderly, GlockApps, InboxAlly, Validity EverestQwen 3.7 FlashSenderLitmus, Validity EverestChangedValidity EverestValidity Everestagainst: Mailgun, SendGridno first choiceagainst: Adobe Campaign, GlockApps, Instantly, Lemlist, MXToolbox, Mail-PHP, MailReach, Rspamd, Salesforce Marketing Cloud, Validity Everest
Five alternatives
Everest, Google Postmaster Tools, Lightmeter, MailReach, Microsoft SNDSOne alternative
GlockAppsFive alternatives
Amazon SES, GlockApps, InboxMonster, MXToolbox, SendGridTwo alternatives
Amazon SES, PostmarkKimi K2Validity EverestValidity EverestHeldagainst: GlockAppsValidity EverestLitmusagainst: GlockApps, Mailgun, SendGrid, SparkPost, Validity EverestSendGridagainst: HubSpot, Mailchimp, Mailgun, SendGrid, Zoho
One alternative
LitmusOne alternative
LitmusFour alternatives
Email on Acid, GlockApps, Inbox Monster, LitmusThree alternatives
Amazon SES, Mailgun, MailtrapGLM 4.7 FlashXValidity EverestValidity EverestHeldFolderly, Validity EverestEverestno first choicenothing named
Three alternatives
Folderly, GlockApps, MailReachFour alternatives
Folderly, GlockApps, Mailgun, SendGridEleven alternatives
EasyDMARC, Email on Acid, GlockApps, Litmus, MXToolbox, MailReach, Mailgun, Mailtrap, Proofpoint Email Fraud Defense, SendForensics, SocketLabsThree alternatives
Amazon SES, Mailgun, SendGridMiniMax M2.5Validity EverestFolderly, Validity EverestChangedValidity Everestno first choiceno first choicenothing named
Two alternatives
Mailgun, SendGridOne alternative
AmplemarketTen alternatives
EasyDMARC, Folderly, GlockApps, Google Postmaster Tools, Instantly, MXToolbox, Mailgun, Mailtrap, ZeroBounce, dmarcianGPT-6 LunaValidity EverestValidity EngageChangedInbox Monster, Validity Engageagainst: Email on AcidInbox Monsteragainst: GlockAppsno first choiceagainst: GlockApps, Litmus, Mail-Tester
One alternative
GlockAppsOne alternative
Inbox MonsterFour alternatives
GlockApps, Litmus, Mailgun Inspect, Mailgun OptimizeMuse Glimmer 30BValidity EverestValidity EverestHeldEmail on Acid, GlockApps, LitmusInstantlyagainst: Lemlist, Mailshake, Outreachno first choiceagainst: MXToolbox, Mail-Tester
Two alternatives
250ok, GlockAppsTwo alternatives
250ok, GlockAppsFive alternatives
Bird Email, Mailgun, Postmark, SendGrid, SparkPostThree alternatives
Return Path, Smartlead, Validity EverestBold is the first choiceAlternatives are counted; the count opens them.What the answer argued against
The record
One row per call: the version string exactly as returned, whether the model searched, sources cited, and latency. Full answer text is in the free responses file. Download the record
Eighty-four rows: every prompt, every model, every answer.
| Prompt | Model | Version string | Time (UTC) | Searched | Sources | Latency |
|---|---|---|---|---|---|---|
| Direct recommendation | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-05 00:28 | yes | 18 | 8 s |
| Direct recommendation | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-04 22:54 | yes | 3 | 4 s |
| Direct recommendation | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-05 00:16 | yes | 14 | 25 s |
| Direct recommendation | Perplexity Sonar | sonar | 2026-10-05 00:16 | yes | 17 | 4 s |
| Direct recommendation | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-04 23:32 | yes | 21 | 10 s |
| Direct recommendation | Mistral Small | mistral/mistral-small via mistral | 2026-10-05 00:59 | yes | 15 | 9 s |
| Direct recommendation | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-04 23:42 | yes | 21 | 64 s |
| Direct recommendation | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-04 23:49 | yes | 5 | 11 s |
| Direct recommendation | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-04 22:14 | yes | 9 | 26 s |
| Direct recommendation | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-04 23:36 | yes | 15 | 18 s |
| Direct recommendation | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-05 00:31 | yes | 24 | 188 s |
| Direct recommendation | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-05 00:25 | yes | 10 | 22 s |
| Direct recommendation | GPT-6 Luna | gpt-6-luna | 2026-10-05 00:30 | yes | 3 | 16 s |
| Direct recommendation | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-05 00:22 | yes | 14 | 13 s |
| Paraphrase | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-05 00:52 | yes | 17 | 9 s |
| Paraphrase | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-04 23:30 | yes | 4 | 4 s |
| Paraphrase | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-05 00:27 | yes | 24 | 33 s |
| Paraphrase | Perplexity Sonar | sonar | 2026-10-05 00:11 | yes | 19 | 3 s |
| Paraphrase | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-04 22:48 | yes | 20 | 10 s |
| Paraphrase | Mistral Small | mistral/mistral-small via mistral | 2026-10-04 23:20 | yes | 15 | 8 s |
| Paraphrase | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-04 23:41 | yes | 23 | 69 s |
| Paraphrase | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-04 22:39 | yes | 5 | 3 s |
| Paraphrase | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-04 22:46 | yes | 15 | 50 s |
| Paraphrase | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-04 22:47 | yes | 22 | 45 s |
| Paraphrase | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-05 00:32 | yes | 22 | 135 s |
| Paraphrase | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-04 22:52 | yes | 9 | 29 s |
| Paraphrase | GPT-6 Luna | gpt-6-luna | 2026-10-05 00:53 | yes | 2 | 23 s |
| Paraphrase | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-05 00:22 | yes | 14 | 18 s |
| Comparative | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-05 00:08 | yes | 9 | 9 s |
| Comparative | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-05 00:03 | yes | 7 | 10 s |
| Comparative | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-04 23:48 | yes | 26 | 36 s |
| Comparative | Perplexity Sonar | sonar | 2026-10-05 00:16 | yes | 18 | 6 s |
| Comparative | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-05 00:30 | yes | 23 | 13 s |
| Comparative | Mistral Small | mistral/mistral-small via mistral | 2026-10-04 22:20 | yes | 10 | 25 s |
| Comparative | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-04 22:36 | yes | 23 | 45 s |
| Comparative | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-05 00:47 | yes | 5 | 2 s |
| Comparative | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-05 00:20 | yes | 9 | 26 s |
| Comparative | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-04 22:32 | yes | 20 | 30 s |
| Comparative | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-04 23:27 | yes | 21 | 217 s |
| Comparative | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-04 22:48 | yes | 9 | 28 s |
| Comparative | GPT-6 Luna | gpt-6-luna | 2026-10-05 00:22 | yes | 7 | 29 s |
| Comparative | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-05 00:37 | yes | 22 | 49 s |
| Budget constrained | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-05 00:54 | yes | 18 | 9 s |
| Budget constrained | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-05 00:40 | yes | 4 | 5 s |
| Budget constrained | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-04 23:31 | yes | 21 | 35 s |
| Budget constrained | Perplexity Sonar | sonar | 2026-10-04 23:11 | yes | 19 | 2 s |
| Budget constrained | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-04 23:44 | yes | 23 | 10 s |
| Budget constrained | Mistral Small | mistral/mistral-small via mistral | 2026-10-05 00:01 | yes | 15 | 9 s |
| Budget constrained | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-05 00:58 | yes | 25 | 23 s |
| Budget constrained | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-05 00:05 | yes | 5 | 2 s |
| Budget constrained | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-04 23:45 | no | 0 | 29 s |
| Budget constrained | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-04 23:16 | yes | 25 | 49 s |
| Budget constrained | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-04 23:28 | yes | 21 | 51 s |
| Budget constrained | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-04 22:15 | yes | 5 | 90 s |
| Budget constrained | GPT-6 Luna | gpt-6-luna | 2026-10-05 00:22 | yes | 2 | 18 s |
| Budget constrained | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-04 23:28 | yes | 19 | 38 s |
| Scale constrained | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-04 23:16 | yes | 18 | 13 s |
| Scale constrained | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-05 00:08 | yes | 2 | 12 s |
| Scale constrained | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-05 00:05 | yes | 6 | 33 s |
| Scale constrained | Perplexity Sonar | sonar | 2026-10-04 22:47 | yes | 20 | 7 s |
| Scale constrained | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-05 00:23 | yes | 19 | 14 s |
| Scale constrained | Mistral Small | mistral/mistral-small via mistral | 2026-10-05 00:11 | no | 0 | 8 s |
| Scale constrained | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-05 00:57 | yes | 23 | 105 s |
| Scale constrained | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-04 22:18 | yes | 5 | 3 s |
| Scale constrained | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-04 23:02 | no | 0 | 25 s |
| Scale constrained | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-05 00:04 | yes | 20 | 34 s |
| Scale constrained | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-04 23:38 | yes | 12 | 61 s |
| Scale constrained | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-04 23:12 | no | 0 | 55 s |
| Scale constrained | GPT-6 Luna | gpt-6-luna | 2026-10-04 23:32 | yes | 4 | 27 s |
| Scale constrained | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-05 00:13 | yes | 13 | 20 s |
| Negative framing | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-10-04 23:16 | yes | 16 | 9 s |
| Negative framing | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-10-05 00:48 | yes | 5 | 7 s |
| Negative framing | Gemini 3.5 Flash | gemini-3.5-flash | 2026-10-04 22:35 | yes | 20 | 31 s |
| Negative framing | Perplexity Sonar | sonar | 2026-10-04 22:12 | yes | 20 | 3 s |
| Negative framing | Grok 4.1 Fast | spacexai/grok-4.1-fast-non-reasoning via vertex | 2026-10-04 23:06 | yes | 19 | 10 s |
| Negative framing | Mistral Small | mistral/mistral-small via mistral | 2026-10-04 22:35 | yes | 19 | 12 s |
| Negative framing | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-10-04 23:15 | yes | 23 | 59 s |
| Negative framing | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-10-04 23:38 | yes | 5 | 2 s |
| Negative framing | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-10-04 22:14 | yes | 22 | 48 s |
| Negative framing | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-10-05 00:24 | yes | 25 | 39 s |
| Negative framing | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-10-04 23:13 | yes | 24 | 85 s |
| Negative framing | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-10-04 22:18 | yes | 21 | 55 s |
| Negative framing | GPT-6 Luna | gpt-6-luna | 2026-10-04 23:45 | yes | 4 | 29 s |
| Negative framing | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-10-04 23:27 | yes | 23 | 26 s |
Normalization in this category
Every judgment call made between the raw labels and the numbers above, listed so it is visible and reversible.
ShowHide
Category-scoped readings
Validity read as Validity Everest
Validity (Everest) read as Validity Everest
Validity (formerly Return Path) read as Validity Everest
Validity (uses GlockApps tech) read as Validity Everest
Unresolved, counted raw
Bird Email
Heatwave
InboxMonster
Infraforge
KickMessage
Lightmeter
Mail-PHP
Mailosaur
Office 365
Postmastery
Proofpoint Email Fraud Defense
Rspamd
Salesforce
Salesforce MC
Sinch Mailgun Optimize
Zoho
Discontinued, still offered
No shut-down product was recommended here.