# Kintsugi vs Vertex O Series (slim)

> Kintsugi scores 60.7 (C) on agent readiness against Vertex O Series's 54.7 (C), and leads in 5 of 7 scored categories. Vertex O Series leads on security & auth and transparency & trust. Both do tax calculate. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/kintsugi-vs-vertex-tax.md (~2,350 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/kintsugi-vs-vertex-tax.json · canonical https://www.anchorterminal.com/compare/kintsugi-vs-vertex-tax
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

Kintsugi scores 60.7 (C) on agent readiness against Vertex O Series's 54.7 (C), and leads in 5 of 7 scored categories. Vertex O Series leads on security & auth and transparency & trust. Both do tax calculate.

- Kintsugi: C 60.7, rank #392 of 722 · https://www.anchorterminal.com/tools/kintsugi.min.md
- Vertex O Series: C 54.7, rank #526 of 722 · https://www.anchorterminal.com/tools/vertex-tax.min.md
- Kintsugi, good for An agent working for a seller that already has Kintsugi Premium and wants estimates, transaction sync, exemptions, nexus, registrations and filing status through one API, or read-only answers about an account through the OAuth MCP server. Ahead on Reliability, 73 against 65; Schema & documentation, 87 against 74; Agent ergonomics, 75 against 51; Payments & pricing, 13 against 0; Maintenance & community, 78 against 62.
- Vertex O Series, good for An agent working inside a company that already has an O Series licence, for quotes, invoice tax, tax area lookups and tax configuration across sales tax, use tax and VAT. Ahead on Security & auth, 57 against 52; Transparency & trust, 68 against 60. Also No incidents deducted, where Kintsugi loses 3 points for them.

| Category | Kintsugi | Vertex O Series |
| --- | --- | --- |
| Reliability (16%) | 73 | 65 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 87 | 74 |
| Agent ergonomics (13%) | 75 | 51 |
| Security & auth (14%) | 52 | 57 |
| Payments & pricing (10%) | 13 | 0 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 78 | 62 |
| Transparency & trust (7%) | 60 | 68 |

| Fact (where they differ) | Kintsugi | Vertex O Series |
| --- | --- | --- |
| Vendor | Kintsugi AI, Inc. | Vertex, Inc. |
| Hosted endpoint | `https://api.trykintsugi.com` | `https://calcconnect.vertexsmb.com/vertex-ws/v2` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | OAuth |
| Licence | Proprietary service under the Kintsugi Terms of Service. The Python SDK repository is MIT | Proprietary service under a customer agreement with Vertex, Inc. that isn't published |
| Tools exposed | 55 | none |
| Read-only variant documented | yes | no |
| llms.txt | yes | no |
| Last release | 2026-10-07 | 2026-09-25 |
| Terms last updated | 2026-09-29 | no date given |
| Privacy policy last updated | 2025-04-13 | no date given |
| Customer content may train models | yes | not found in the text |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 71 npm/wk, 10 PyPI/wk | none |