# ChatGPT: how AI models rank it, October 2026

Finance AI Recommendation Index, October 2026 Edition. Named in 9 judge labels across 2 categories by 8 of 14 models. Page: https://finance-ai-index.com/vendors/chatgpt/

## Standing by category

| Category | Share | Rank | Negative rate | Labels |
|---|---|---|---|---|
| AI accounting assistants | 0% | 85 | 100% | 8 |
| Sales tax automation | 0% | 36 | 100% | 1 |

## And against it

- "Examples: ChatGPT, TaxGPT, or other general-purpose AI tools - Why to avoid: These are designed for individual income tax questions, not multi-jurisdiction B2B sales tax compliance." (GLM 4.7 FlashX, Sales tax automation)
- "This includes tools like ChatGPT (free/Plus tiers), Claude, and Gemini when used with sensitive data. ChatGPT hallucinates specific numbers and regulatory details with confidence" (Claude Haiku 4.5, AI accounting assistants)
- "Best practice guidance is to keep client data out of general chat models and use sanitized or dummy data. ChatGPT hallucinates, and it sounds just as confident when it's wrong." (Muse Glimmer 30B, AI accounting assistants)
- "Free or standalone chatbots like public ChatGPT/Claude-style tools when used with client data, because they may lack robust security and may use inputs for training." (Perplexity Sonar, AI accounting assistants)

## Movement since September 2026

Floor: 10 points of share, measured on the calibration repeat. A larger change is movement; a smaller one is noise.

- AI accounting assistants: 0% to 0%, ±0. Inside the floor by 10 points · rank 78 → 85 of 85.
- Sales tax automation: 0% to 0%, ±0. New · not ranked in September 2026 · rank 36 of 37.

## Record

- Method: https://finance-ai-index.com/methodology/
- Raw judge labels and full responses: https://finance-ai-index.com/data/
- License: CC BY 4.0. Cite as Finance AI Recommendation Index, October 2026 Edition, finance-ai-index.com.