# Microsoft-Decision-1 vs Drex 1.5 (slim)

> Drex 1.5 scores 69.7 (B) to Microsoft-Decision-1's 39 (E) for decision models. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/microsoft-decision-1-vs-nace-drex.md (~2,750 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/microsoft-decision-1-vs-nace-drex.json · canonical https://www.anchorterminal.com/compare/microsoft-decision-1-vs-nace-drex
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-10

Drex 1.5 scores 69.7 (B) on agent readiness against Microsoft-Decision-1's 39 (E), and leads in every scored category. Both do decision models.

- Microsoft-Decision-1: E 39, rank #921 of 954 · https://www.anchorterminal.com/tools/microsoft-decision-1.min.md
- Drex 1.5: B 69.7, rank #172 of 954 · https://www.anchorterminal.com/tools/nace-drex.min.md
- Microsoft-Decision-1, good for Routing, classification, prioritisation and rubric checks over text, where a fixed set of options and a low price per token matter more than generated text.
- 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 30; Schema & documentation, 88 against 43; Agent ergonomics, 85 against 50; Security & auth, 65 against 52; Payments & pricing, 40 against 20; Maintenance & community, 65 against 40; Transparency & trust, 63 against 32. Also A hosted endpoint, with nothing to install.

| Category | Microsoft-Decision-1 | Drex 1.5 |
| --- | --- | --- |
| Reliability (16%) | 30 | 80 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 43 | 88 |
| Agent ergonomics (13%) | 50 | 85 |
| Security & auth (14%) | 52 | 65 |
| Payments & pricing (10%) | 20 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 40 | 65 |
| Transparency & trust (7%) | 32 | 63 |

| Fact (where they differ) | Microsoft-Decision-1 | Drex 1.5 |
| --- | --- | --- |
| Vendor | Microsoft | Nace AI, Inc. (Nace.AI) |
| Hosted endpoint | no (local only) | `https://console.nace.ai/v1/systemone` |
| Auth | OAuth or key | API key |
| Pricing | Pay per use | Freemium |
| Price for decision models | free | not published |
| Licence | Not stated. The announcement and OpenRouter's model page name no licence, and no weights repository was found. | 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. |
| llms.txt | no | yes |
| Last release | 2026-10-09 | 2026-09-28 |
| Terms last updated | no document linked |  |
| Popularity | none | 318 npm/wk, 156 PyPI/wk |