# Customer success platforms: what AI models recommend, September 2026

Gane Index, September 2026 Edition. Asked as "customer success platform" and as "customer health and retention management tool", six framings each, to six frontier models with search on, on behalf of a mid-market B2B software company. Page: https://www.gane.ai/index/gtm/customer/customer-success-platforms/2026-09-expanded

This is the permanent record of the September 2026 Edition, published September 9, 2026 and superseded since. The current standing: https://www.gane.ai/index/gtm/customer/customer-success-platforms/index.md

**Standing:** ChurnZero leads with 48% of first choices; verdict clear leader. 31 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| Rank | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | [ChurnZero](https://www.gane.ai/index/gtm/vendors/churnzero/index.md) | 48% | 10% | 29 |
| 2 | [Vitally](https://www.gane.ai/index/gtm/vendors/vitally/index.md) | 19% | 10% | 31 |
| 3 | [Custify](https://www.gane.ai/index/gtm/vendors/custify/index.md) | 10% | 0% | 17 |
| 4 | [HubSpot Service Hub](https://www.gane.ai/index/gtm/vendors/hubspot-service-hub/index.md) | 10% | 0% | 11 |
| 5 | [Totango](https://www.gane.ai/index/gtm/vendors/totango/index.md) | 6% | 35% | 23 |
| 6 | [Planhat](https://www.gane.ai/index/gtm/vendors/planhat/index.md) | 3% | 12% | 26 |
| 9 | [Catalyst](https://www.gane.ai/index/gtm/vendors/catalyst/index.md) | 0% | 25% | 12 |
| 34 | [Gainsight Customer Success](https://www.gane.ai/index/gtm/vendors/gainsight-customer-success/index.md) | 0% | 56% | 32 |

Rank is by share of first choices among all 34 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 Opus 5: ChurnZero, Vitally; alternatives ClientSuccess, Custify, Planhat
- Claude Opus 4.8: ChurnZero, Vitally; alternatives Totango
- GPT-6 Astra: ChurnZero; alternatives Planhat, Vitally
- GPT-5.6 Sol: ChurnZero; alternatives Planhat, Vitally
- Gemini 3.1 Pro: ChurnZero; alternatives ClientSuccess, Custify, Planhat, Vitally
- Perplexity Sonar Pro: ChurnZero; alternatives Planhat, Vitally

## Sources the answers cite

34 of 36 answers came back with a source list, from 6 of 6 models. Sites named in the most answers:

- vitally.io: 17 answers, 26 citations
- g2.com: 15 answers, 31 citations
- churnzero.com: 15 answers, 24 citations
- userpilot.com: 15 answers, 15 citations
- usepylon.com: 14 answers, 24 citations
- oliv.ai: 14 answers, 23 citations
- gartner.com: 14 answers, 19 citations
- gainsight.com: 13 answers, 16 citations

Pages named in the most answers:

- https://userpilot.com/blog/customer-success-tools (15 answers)
- https://gartner.com/reviews/market/customer-success-management-platforms (13 answers)
- https://thecscafe.com/p/best-customer-success-platforms (11 answers)
- https://coworker.ai/blog/customer-success-platforms (10 answers)
- https://usepylon.com/blog/csm-tools-2026 (10 answers)
- https://oliv.ai/blog/best-customer-success-platforms (9 answers)
- https://blog.customerscore.io/8-best-customer-success-software-in-2025-for-saas (7 answers)
- https://g2.com/categories/customer-success (7 answers)
- https://oliv.ai/blog/churnzero-alternatives (7 answers)
- https://churnzero.com/customer-success-software (6 answers)

## Warned against

- Gainsight Customer Success: 18 of 32 labels negative. "avoid heavy enterprise tools like Gainsight, which can be expensive and require lengthy, costly implementations" (Gemini 3.1 Pro, budget prompt)
- Totango: 8 of 23 labels negative. "Totango / Catalyst is the clearest flag right now... the merger introduced instability, with multiple mid-market teams migrating away post-merger" (Claude Opus 5, negative prompt)
- Catalyst: 3 of 12 labels negative. "Totango / Catalyst is the clearest flag right now... the merger introduced instability, with multiple mid-market teams migrating away post-merger" (Claude Opus 5, negative prompt)
- Planhat: 3 of 26 labels negative. "Highly flexible, but that flexibility creates operational overhead... significant configuration effort, field-management sprawl" (GPT-5.6 Sol, negative prompt)

## Record

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