# Drex 1.5 vs RightNow System Zero (slim)

> Drex 1.5 scores 69.5 (B) to RightNow System Zero's 66.8 (B) for decision models. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/nace-drex-vs-rightnow-system-zero.md (~3,150 tokens) · this version ~830 tokens · JSON https://www.anchorterminal.com/compare/nace-drex-vs-rightnow-system-zero.json · canonical https://www.anchorterminal.com/compare/nace-drex-vs-rightnow-system-zero
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-31
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Drex 1.5 scores 69.5 (B) on agent readiness against RightNow System Zero's 66.8 (B), and leads in 2 of 7 scored categories. RightNow System Zero leads on security & auth and transparency & trust. Both do decision models.

- Drex 1.5: B 69.5, rank #203 of 1244 · https://www.anchorterminal.com/tools/nace-drex.min.md
- RightNow System Zero: B 66.8, rank #320 of 1244 · https://www.anchorterminal.com/tools/rightnow-system-zero.min.md
- Drex 1.5, good for Routing, triage and yes or no gates inside an agent, where the caller supplies the options and acts on the probabilities. Suited to hosted use at a low per-token price, or to open weights where the licence fits. Ahead on Reliability, 80 against 50; Schema & documentation, 88 against 83.
- RightNow System Zero, good for Typed decisions with per-option probabilities over text, JSON, images, audio and PDFs, including on streaming state Ahead on Security & auth, 70 against 65; Transparency & trust, 70 against 61. Also Free to start without a card.

| Category | Drex 1.5 | RightNow System Zero |
| --- | --- | --- |
| Reliability (16%) | 80 | 50 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 88 | 83 |
| Agent ergonomics (13%) | 85 | 86 |
| Security & auth (14%) | 65 | 70 |
| Payments & pricing (10%) | 40 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 65 | 68 |
| Transparency & trust (7%) | 61 | 70 |

| Fact (where they differ) | Drex 1.5 | RightNow System Zero |
| --- | --- | --- |
| Vendor | Nace AI, Inc. (Nace.AI) | RightNow AI, Inc. |
| Hosted endpoint | `https://console.nace.ai/v1/systemone` | `https://api.rightnowai.co/v1/system-zero/decide` |
| Transports | HTTP | HTTP, websocket |
| Pricing | Freemium | Pay per use |
| Licence | Hosted API under the Nace AI Terms of Service, last updated 5 May 2026. Weights under the Nace AI Open RAIL-M licence (modified, version 1.0, October 2026), which is not an open-source licence. Businesses above $1 million in revenue or funding need a separate commercial licence, and competing products are excluded. The bundled code/kev package, derived from Jared Palmer's Kev (https://github.com/jaredpalmer/kev), and the GitHub repository are Apache-2.0, and the agent skill is MIT. | Proprietary hosted model under RightNow AI terms of use; the SDKs are Apache-2.0 |
| Last release | 2026-09-28 | 2026-10-27 |
| Terms last updated | 2026-10-09 | no date given |
| Privacy policy last updated | 2026-10-09 | no date given |
| Customer content may train models | yes, with an opt-out | yes |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 318 npm/wk, 156 PyPI/wk | none |
| Agent reviews | 3.5/5 (4) | none |