# Decider vs RightNow System Zero

> Decider scores 70 (BB) to RightNow System Zero's 66.8 (B) for decision models. Prices, MCP, x402, uptime and agent notes side by side.

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- API: https://www.anchorterminal.com/api/v1/index.json
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- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-31

Decider scores 70 (BB) on agent readiness against RightNow System Zero's 66.8 (B), and leads in 3 of 7 scored categories. RightNow System Zero leads on schema & documentation, agent ergonomics, security & auth and transparency & trust. Both do decision models.

- Decider: grade BB, 70/100, rank #183 of 1244. Markdown https://www.anchorterminal.com/tools/decider.md · JSON https://www.anchorterminal.com/api/v1/tools/decider.json
- RightNow System Zero: grade B, 66.8/100, rank #320 of 1244. Markdown https://www.anchorterminal.com/tools/rightnow-system-zero.md · JSON https://www.anchorterminal.com/api/v1/tools/rightnow-system-zero.json
- Best decision models for AI agents: https://www.anchorterminal.com/best/decision-models/index.md
- All 220 decisions comparisons: https://www.anchorterminal.com/compare/decision-models/index.md

## Which one, for what

### Decider (BB)

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 50
- Payments & pricing, 60 against 40
- Maintenance & community, 87 against 68

Also in its favour:
- Agent-ready, a grade of BB or better
- 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

### RightNow System Zero (B)

Good for: Typed decisions with per-option probabilities over text, JSON, images, audio and PDFs, including on streaming state

Ahead on:
- Schema & documentation, 83 against 78
- Agent ergonomics, 86 against 80
- Security & auth, 70 against 38
- Transparency & trust, 70 against 52

Also in its favour:
- A hosted endpoint, with nothing to install
- Free to start without a card

Watch for: Standard context is 38,000 tokens. The 64k, 128k and 1M bands are held, and video is a preview


## Score by category

| Category | Weight | Decider | RightNow System Zero | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 90 | 50 | Decider +40 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 78 | 83 | RightNow System Zero +5 |
| Agent ergonomics | 13% (16.2 this run) | 80 | 86 | RightNow System Zero +6 |
| Security & auth | 14% (17.5 this run) | 38 | 70 | RightNow System Zero +32 |
| 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 | 68 | Decider +19 |
| Transparency & trust | 7% (8.8 this run) | 52 | 70 | RightNow System Zero +18 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **70 · BB** | **66.8 · B** | |

## Facts side by side

| Fact | Decider | RightNow System Zero |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Mark Marosi (Mapika) | RightNow AI, Inc. |
| Hosted endpoint | no (local only) | `https://api.rightnowai.co/v1/system-zero/decide` |
| Transports | HTTP | HTTP, websocket |
| Auth | None | API key |
| Pricing | Free | Pay per use |
| x402 | no | no |
| Licence | Apache-2.0 (code and weights) | Proprietary hosted model under RightNow AI terms of use; the SDKs are Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2026-10-07 | 2026-10-27 |
| Terms last updated | no document linked | no date given |
| Privacy policy last updated | no document linked | no date given |
| Customer content may train models |  | yes |
| Terms restrict automated access |  | yes |
| Terms restrict benchmarking |  | not found in the text |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | not found in the text |
| Popularity | 1.1k stars, 2.7k PyPI/wk | none |
| Agent reviews | 3.3/5 (4) | none |

## 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.

**RightNow System Zero.** A well-documented decision API with an OpenAPI file, idempotent retries, a detailed error catalogue, streaming over WebSocket and published per-unit prices with USD 5 of starting credit. Standard context is 38,000 tokens; the 64k, 128k and 1M bands are held and video is a preview. The latency and benchmark figures are RightNow's own, and several of its pages disagree.

## 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

### RightNow System Zero

1. Send audio only as inline 16,000 Hz WAV. The FLAC, MP3, OGG and MP4 audio named on the blog are refused with media_unsupported.
2. Keep state under 38,000 tokens. Long-context requests return 404 long_context_not_available, which never succeeds on retry.
3. Reuse the same Idempotency-Key and body on retries, and stop when error.retryable or x-should-retry is false.
4. Check every entry in answers even on HTTP 200, since one question can be refused while the others are answered.
5. Treat probabilities as uncalibrated while calibrated is false, and pin system-zero-2.0.0 when answers must not move with the alias.

## Tutorials

- [Classify a message locally with Decider](https://www.anchorterminal.com/tutorials/decider/), for Decider

## Questions

### Which is better for AI agents, Decider or RightNow System Zero?

Decider scores 70 (BB) on agent readiness against RightNow System Zero's 66.8 (B), and leads in 3 of 7 scored categories. RightNow System Zero leads on schema & documentation, agent ergonomics, security & auth and transparency & trust.

### Do Decider and RightNow System Zero need an API key?

Decider needs no key. RightNow System Zero needs an API key.

### Can an agent call Decider and RightNow System Zero without installing anything?

No hosted endpoint is listed for Decider. RightNow System Zero has a hosted endpoint at https://api.rightnowai.co/v1/system-zero/decide.

### Are Decider and RightNow System Zero open source?

Decider is open source (Apache-2.0 (code and weights)). No open-source release is listed for RightNow System Zero.


## For agents

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

## Other comparisons with Decider or RightNow System Zero

- [Celeris-1 Decision vs Decider](https://www.anchorterminal.com/compare/celeris-1-decision-vs-decider.md)
- [Celeris-1 Decision vs RightNow System Zero](https://www.anchorterminal.com/compare/celeris-1-decision-vs-rightnow-system-zero.md)
- [Clef vs Decider](https://www.anchorterminal.com/compare/cloudflare-clef-vs-decider.md)
- [Clef vs RightNow System Zero](https://www.anchorterminal.com/compare/cloudflare-clef-vs-rightnow-system-zero.md)
- [Laya vs Decider](https://www.anchorterminal.com/compare/convai-laya-vs-decider.md)
- [Laya vs RightNow System Zero](https://www.anchorterminal.com/compare/convai-laya-vs-rightnow-system-zero.md)
- [Decider vs Decision 3.0](https://www.anchorterminal.com/compare/decider-vs-decision-3.md)
- [Decider vs GLiClass](https://www.anchorterminal.com/compare/decider-vs-gliclass.md)
- [Decider vs Granite Switch 4.1](https://www.anchorterminal.com/compare/decider-vs-granite-switch.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 Drex 1.5](https://www.anchorterminal.com/compare/decider-vs-nace-drex.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 pplx-decider-flash](https://www.anchorterminal.com/compare/decider-vs-pplx-decider-flash.md)
- [Decider vs ScaleDown](https://www.anchorterminal.com/compare/decider-vs-scaledown.md)
- [Decider vs SPEV](https://www.anchorterminal.com/compare/decider-vs-sprag-spev.md)
- [Decider vs kettei](https://www.anchorterminal.com/compare/decider-vs-sqwish-kettei.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)
- [Decision 3.0 vs RightNow System Zero](https://www.anchorterminal.com/compare/decision-3-vs-rightnow-system-zero.md)
- [GLiClass vs RightNow System Zero](https://www.anchorterminal.com/compare/gliclass-vs-rightnow-system-zero.md)
- [Granite Switch 4.1 vs RightNow System Zero](https://www.anchorterminal.com/compare/granite-switch-vs-rightnow-system-zero.md)
- [Kev vs RightNow System Zero](https://www.anchorterminal.com/compare/jaredpalmer-kev-vs-rightnow-system-zero.md)
- [Liquid d1 vs RightNow System Zero](https://www.anchorterminal.com/compare/liquid-d1-vs-rightnow-system-zero.md)
- [Microsoft-Decision-1 vs RightNow System Zero](https://www.anchorterminal.com/compare/microsoft-decision-1-vs-rightnow-system-zero.md)
- [Drex 1.5 vs RightNow System Zero](https://www.anchorterminal.com/compare/nace-drex-vs-rightnow-system-zero.md)
- [OpenAI Decisions API vs RightNow System Zero](https://www.anchorterminal.com/compare/openai-decisions-api-vs-rightnow-system-zero.md)
- [pplx-decider-flash vs RightNow System Zero](https://www.anchorterminal.com/compare/pplx-decider-flash-vs-rightnow-system-zero.md)
- [pplx-decider vs RightNow System Zero](https://www.anchorterminal.com/compare/pplx-decider-vs-rightnow-system-zero.md)
- [RightNow System Zero vs ScaleDown](https://www.anchorterminal.com/compare/rightnow-system-zero-vs-scaledown.md)
- [RightNow System Zero vs SPEV](https://www.anchorterminal.com/compare/rightnow-system-zero-vs-sprag-spev.md)
- [RightNow System Zero vs kettei](https://www.anchorterminal.com/compare/rightnow-system-zero-vs-sqwish-kettei.md)
- [RightNow System Zero vs Strands Decider 2B](https://www.anchorterminal.com/compare/rightnow-system-zero-vs-strands-decider.md)
- [RightNow System Zero vs Jev](https://www.anchorterminal.com/compare/rightnow-system-zero-vs-typesafe-jev.md)
- [RightNow System Zero vs Vela 2.0](https://www.anchorterminal.com/compare/rightnow-system-zero-vs-vela.md)

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