Sierra vs Zendesk AI
as AI assistants see them, week of 2026-09-21
Zendesk AI comes out well ahead of Sierra in how AI assistants talk about customer support tools. Zendesk AI scores 61 overall, versus 25 for Sierra, with the gap holding across ChatGPT (69 vs 26), Claude (68 vs 48) and Perplexity (47 vs 3). Zendesk AI also shows up far more often, named in 48 of 60 answers compared to Sierra's 25 of 60, and it's missing from just one question versus four for Sierra. Head to head, Zendesk AI is named more often in 15 of 20 shared questions, tied in 5, and never trails Sierra.
Head to head
| metric | Sierra | Zendesk AI |
|---|---|---|
| score | 25 | 61 |
| questions won | 16 | 19 |
By assistant
Sierra
| assistant | score | named in, this week | usual spot, this week |
|---|---|---|---|
| ChatGPT | 26 | 40% of answers | #4.8 |
| Claude | 48 | 80% of answers | #5.5 |
| Gemini | not sampled this week | ||
| Perplexity | 3 | 5% of answers | #6.0 |
Zendesk AI
| assistant | score | named in, this week | usual spot, this week |
|---|---|---|---|
| ChatGPT | 69 | 85% of answers | #2.6 |
| Claude | 68 | 95% of answers | #3.6 |
| Gemini | not sampled this week | ||
| Perplexity | 47 | 60% of answers | #2.8 |
Where they differ
Only Sierra gets named for
nothing exclusive
Only Zendesk AI gets named for
- What's the best AI tool to draft replies for support agents rather than replace them?
- What's the best AI support agent for an ecommerce store?
- Which AI support tool is easiest to set up?
More comparisons
- Ada vs Sierra
- Decagon vs Sierra
- Salesforce Agentforce vs Sierra
- Gorgias vs Sierra
- Freshdesk vs Sierra
- Intercom Fin vs Zendesk AI
Not sold on either?
Scores count how often each assistant names a product, weighted by position. How the score works · Full AI customer support agents leaderboard