# Decider vs Drex 1.5

> Drex 1.5 and Decider score within a point of each other for decision models, 69.7 and 69.5 out of 100. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/decider-vs-nace-drex
- Markdown: https://www.anchorterminal.com/compare/decider-vs-nace-drex.md (~2,600 tokens)
- Slim: https://www.anchorterminal.com/compare/decider-vs-nace-drex.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/decider-vs-nace-drex.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-10

Drex 1.5 and Decider score within a point of each other on agent readiness, 69.7 (B) and 69.5 (B). Decider leads on reliability, payments & pricing and maintenance & community. Both do decision models.

- Decider: grade B, 69.5/100, rank #181 of 954. Markdown https://www.anchorterminal.com/tools/decider.md · JSON https://www.anchorterminal.com/api/v1/tools/decider.json
- Drex 1.5: grade B, 69.7/100, rank #172 of 954. Markdown https://www.anchorterminal.com/tools/nace-drex.md · JSON https://www.anchorterminal.com/api/v1/tools/nace-drex.json
- Best decision models for AI agents: https://www.anchorterminal.com/best/decision-models/index.md
- All 91 decisions comparisons: https://www.anchorterminal.com/compare/decision-models/index.md

## Which one, for what

### Decider (B)

Good for: Local classification, routing, triage and checks where a team wants open weights in several sizes and a Jev-shaped route.

Ahead on:
- Reliability, 90 against 80
- Payments & pricing, 60 against 40
- Maintenance & community, 87 against 65

Also in its favour:
- No key needed to call it
- Open source

Watch for: The local server has no authentication option. It binds to 127.0.0.1 since 1.7.1

### Drex 1.5 (B)

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:
- Schema & documentation, 88 against 78
- Agent ergonomics, 85 against 80
- Security & auth, 65 against 38
- Transparency & trust, 63 against 46

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: The rank 1 claim comes from Nace's own run on Decision Index 0.3.1, and Drex is not on the public board for 0.3 or 0.2.1.


## Score by category

| Category | Weight | Decider | Drex 1.5 | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 90 | 80 | Decider +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 78 | 88 | Drex 1.5 +10 |
| Agent ergonomics | 13% (16.2 this run) | 80 | 85 | Drex 1.5 +5 |
| Security & auth | 14% (17.5 this run) | 38 | 65 | Drex 1.5 +27 |
| Payments & pricing | 10% (12.5 this run) | 60 | 40 | Decider +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 87 | 65 | Decider +22 |
| Transparency & trust | 7% (8.8 this run) | 46 | 63 | Drex 1.5 +17 |
| Negative events | ≤15 | 0 | -2 | |
| **Total** | | **69.5 · B** | **69.7 · B** | |

## Facts side by side

| Fact | Decider | Drex 1.5 |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Mark Marosi (Mapika) | Nace AI, Inc. (Nace.AI) |
| Hosted endpoint | no (local only) | `https://console.nace.ai/v1/systemone` |
| Transports | HTTP | HTTP |
| Auth | None | API key |
| Pricing | Free | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 (code and weights) | 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. |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2026-10-07 | 2026-09-28 |
| Terms last updated | no document linked |  |
| Privacy policy last updated | no document linked |  |
| Customer content may train models |  |  |
| Terms restrict automated access |  |  |
| Terms restrict benchmarking |  |  |
| Terms or service can change without notice |  |  |
| Arbitration or class-action waiver |  |  |
| Popularity | 1.1k stars, 2.7k PyPI/wk | 318 npm/wk, 156 PyPI/wk |

## Verdicts

**Decider.** An Apache-2.0 decision model family with a dated changelog, passing CI, 21 package releases since 22 September 2026 and model cards that list measured regressions. One person maintains it, the local server has no authentication option, states over 32,768 tokens are cut without an error, and no security policy is published.

**Drex 1.5.** The hosted endpoint has a public OpenAPI document, published limits and pinned model versions, at $0.05 per million input tokens with no output charge. The #1 under 10B claim rests on Nace's own run, since Drex is absent from both public boards. Weights carry Open RAIL-M, which requires a commercial licence above $1 million in revenue or funding.

## Before you call either

### Decider

1. Pin weights by Hub tag (`v10`, `v2`) when results must repeat. The `main` branch of each model repository changes with new versions
2. Read `x_p_max` for the top probability. Since 1.3.0 `confidence` on choice and score answers follows TypeSafe's rescaled definition, not the top probability
3. Keep the server on 127.0.0.1 or put an authenticating proxy in front. It has no key option
4. Count state tokens before sending. Over 32,768 the state is cut silently, and `/decide` caps context at 1,536 tokens
5. Split multi-step arithmetic or multi-hop judgements into several questions, and don't write long rules into a question. The README says both fail

### Drex 1.5

1. Call https://console.nace.ai/v1/systemone with Authorization: Bearer nace_sk_..., and pin model drex-v1.5 rather than drex-latest in production.
2. Stop on 402 insufficient_credit or 402 payment_required until credit is topped up or the unpaid invoice is paid.
3. Retry 429 and 529 after retry-after-ms. On a 422 for an unknown model, use one of the ids the error message lists.
4. Keep state below 131,072 tokens and the body below 1,048,576 bytes, and send at most 512 questions per request.
5. Keep the key on a server. A key in browser code is exposed, and the /v1 routes send no Access-Control-Allow-Origin header.
6. Check usage.input_tokens and the usage CSV after retries, since /v1/systemone documents no idempotency key.

## Questions

### Which is better for AI agents, Decider or Drex 1.5?

Drex 1.5 and Decider score within a point of each other on agent readiness, 69.7 (B) and 69.5 (B). Decider leads on reliability, payments & pricing and maintenance & community.

### Do Decider and Drex 1.5 need an API key?

Decider needs no key. Drex 1.5 needs an API key.

### Can an agent call Decider and Drex 1.5 without installing anything?

No hosted endpoint is listed for Decider. Drex 1.5 has a hosted endpoint at https://console.nace.ai/v1/systemone.

### Are Decider and Drex 1.5 open source?

Decider is open source (Apache-2.0 (code and weights)). No open-source release is listed for Drex 1.5.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/decider-vs-nace-drex.json, and with the fewest tokens: https://www.anchorterminal.com/compare/decider-vs-nace-drex.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "decider", "b": "nace-drex"}`. From a terminal: `anchor compare decider nace-drex`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/decider.json and https://www.anchorterminal.com/api/v1/tools/nace-drex.json

## Other comparisons with Decider or Drex 1.5

- [Celeris-1 Decision vs Decider](https://www.anchorterminal.com/compare/celeris-1-decision-vs-decider.md)
- [Celeris-1 Decision vs Drex 1.5](https://www.anchorterminal.com/compare/celeris-1-decision-vs-nace-drex.md)
- [Clef vs Decider](https://www.anchorterminal.com/compare/cloudflare-clef-vs-decider.md)
- [Clef vs Drex 1.5](https://www.anchorterminal.com/compare/cloudflare-clef-vs-nace-drex.md)
- [Laya vs Decider](https://www.anchorterminal.com/compare/convai-laya-vs-decider.md)
- [Laya vs Drex 1.5](https://www.anchorterminal.com/compare/convai-laya-vs-nace-drex.md)
- [Decider vs GLiClass](https://www.anchorterminal.com/compare/decider-vs-gliclass.md)
- [Decider vs Kev](https://www.anchorterminal.com/compare/decider-vs-jaredpalmer-kev.md)
- [Decider vs Liquid d1](https://www.anchorterminal.com/compare/decider-vs-liquid-d1.md)
- [Decider vs Microsoft-Decision-1](https://www.anchorterminal.com/compare/decider-vs-microsoft-decision-1.md)
- [Decider vs OpenAI Decisions API](https://www.anchorterminal.com/compare/decider-vs-openai-decisions-api.md)
- [Decider vs pplx-decider](https://www.anchorterminal.com/compare/decider-vs-pplx-decider.md)
- [Decider vs Strands Decider 2B](https://www.anchorterminal.com/compare/decider-vs-strands-decider.md)
- [Decider vs Jev](https://www.anchorterminal.com/compare/decider-vs-typesafe-jev.md)
- [Decider vs Vela 2.0](https://www.anchorterminal.com/compare/decider-vs-vela.md)
- [GLiClass vs Drex 1.5](https://www.anchorterminal.com/compare/gliclass-vs-nace-drex.md)
- [Kev vs Drex 1.5](https://www.anchorterminal.com/compare/jaredpalmer-kev-vs-nace-drex.md)
- [Liquid d1 vs Drex 1.5](https://www.anchorterminal.com/compare/liquid-d1-vs-nace-drex.md)
- [Microsoft-Decision-1 vs Drex 1.5](https://www.anchorterminal.com/compare/microsoft-decision-1-vs-nace-drex.md)
- [Drex 1.5 vs OpenAI Decisions API](https://www.anchorterminal.com/compare/nace-drex-vs-openai-decisions-api.md)
- [Drex 1.5 vs pplx-decider](https://www.anchorterminal.com/compare/nace-drex-vs-pplx-decider.md)
- [Drex 1.5 vs Strands Decider 2B](https://www.anchorterminal.com/compare/nace-drex-vs-strands-decider.md)
- [Drex 1.5 vs Jev](https://www.anchorterminal.com/compare/nace-drex-vs-typesafe-jev.md)
- [Drex 1.5 vs Vela 2.0](https://www.anchorterminal.com/compare/nace-drex-vs-vela.md)