Head to head · Decision models · October 2026 research run
Celeris-1 Decision vs RightNow System Zero
RightNow System Zero scores 66.8 (B) on agent readiness against Celeris-1 Decision's 49.4 (D), and leads in every scored category. Both do decision models.
Best decision models for AI agents · All 220 decisions comparisons
Which one, for what
Best for Multimodal classification, routing and bounded decisions with probabilities and optional explanations
No category where it leads by five points or more, and no fact that sets it apart.
Watch for
Early-access terms and capacity-dependent workspace activation
Best for Typed decisions with per-option probabilities over text, JSON, images, audio and PDFs, including on streaming state
Ahead on
- Reliability, 50 against 40
- Schema & documentation, 83 against 60
- Agent ergonomics, 86 against 80
- Security & auth, 70 against 45
- Payments & pricing, 40 against 20
- Maintenance & community, 68 against 40
- Transparency & trust, 70 against 55
Also in its favour
- 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 this run | Celeris-1 Decision | RightNow System Zero | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 40 | 50 | RightNow System Zero +10 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 60 | 83 | RightNow System Zero +23 |
| Agent ergonomics | 13%16.2 | 80 | 86 | RightNow System Zero +6 |
| Security & auth | 14%17.5 | 45 | 70 | RightNow System Zero +25 |
| Payments & pricing | 10%12.5 | 20 | 40 | RightNow System Zero +20 |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 40 | 68 | RightNow System Zero +28 |
| Transparency & trust | 7%8.8 | 55 | 70 | RightNow System Zero +15 |
| Negative events | ≤15 | 0 | 0 | |
| Total | D 49.4/100 | B 66.8/100 |
Facts side by side
| Fact | Celeris-1 Decision | RightNow System Zero |
|---|---|---|
| Kind | Model API | Model API |
| Vendor | Celeris (Marqo Inc) | RightNow AI, Inc. |
| Hosted endpoint | https://inference.celeris.ai/celeris-1-decision/v1/systemone | https://api.rightnowai.co/v1/system-zero/decide |
| Transports | HTTP | HTTP, websocket |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| Price for decision models | free | not published |
| x402 | no | no |
| Licence | Proprietary hosted model under Celeris terms of service | Proprietary hosted model under RightNow AI terms of use; the SDKs are Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-08 | 2026-10-27 |
| Terms last updated | 2026-09-08 | no date given |
| Privacy policy last updated | 2026-07-23 | no date given |
| Customer content may train models | not found in the text | 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 | not found in the text | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
Verdicts
Celeris-1 Decision
Typed probabilities, image inputs and optional explanations suit routing and classification inside an agent. Both System One and OpenAI Decisions request formats are documented. The service remains early access under its terms, activation can queue, and prepaid credit expires after 30 days. The published accuracy and latency figures are Celeris measurements, not Anchor Terminal tests.
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
Celeris-1 Decision
- Use the decision model path and matching model field. This model has no chat, Responses or models endpoint.
- Use at most 512 questions per request, or 64 with explanations. Both endpoints reject streaming.
- Preserve x_celeris in a custom Jev SDK response model when reading explanations. The default response type drops it.
- Retry 429 with Retry-After and backoff. Stop on 402 until workspace credit is replenished.
- Read usage.input_tokens for cost, including images and request overhead. Track credit expiry separately from token consumption.
RightNow System Zero
- 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.
- Keep state under 38,000 tokens. Long-context requests return 404 long_context_not_available, which never succeeds on retry.
- Reuse the same Idempotency-Key and body on retries, and stop when error.retryable or x-should-retry is false.
- Check every entry in answers even on HTTP 200, since one question can be refused while the others are answered.
- Treat probabilities as uncalibrated while calibrated is false, and pin system-zero-2.0.0 when answers must not move with the alias.
Questions
Which is better for AI agents, Celeris-1 Decision or RightNow System Zero?
RightNow System Zero scores 66.8 (B) on agent readiness against Celeris-1 Decision's 49.4 (D), and leads in every scored category.
Do Celeris-1 Decision and RightNow System Zero need an API key?
Both need an API key.
Can an agent call Celeris-1 Decision and RightNow System Zero without installing anything?
Yes. Celeris-1 Decision has a hosted endpoint at https://inference.celeris.ai/celeris-1-decision/v1/systemone and RightNow System Zero at https://api.rightnowai.co/v1/system-zero/decide.
Other comparisons with Celeris-1 Decision or RightNow System Zero
- Celeris-1 Decision vs Clef
- Celeris-1 Decision vs Laya
- Celeris-1 Decision vs Decider
- Celeris-1 Decision vs Decision 3.0
- Celeris-1 Decision vs GLiClass
- Celeris-1 Decision vs Granite Switch 4.1
- Celeris-1 Decision vs Kev
- Celeris-1 Decision vs Liquid d1
- Celeris-1 Decision vs Microsoft-Decision-1
- Celeris-1 Decision vs Drex 1.5
- Celeris-1 Decision vs OpenAI Decisions API
- Celeris-1 Decision vs pplx-decider
- Celeris-1 Decision vs pplx-decider-flash
- Celeris-1 Decision vs ScaleDown
- Celeris-1 Decision vs SPEV
- Celeris-1 Decision vs kettei
- Celeris-1 Decision vs Strands Decider 2B
- Celeris-1 Decision vs Jev
- Celeris-1 Decision vs Vela 2.0
- Clef vs RightNow System Zero
- Laya vs RightNow System Zero
- Decider vs RightNow System Zero
- Decision 3.0 vs RightNow System Zero
- GLiClass vs RightNow System Zero
- Granite Switch 4.1 vs RightNow System Zero
- Kev vs RightNow System Zero
- Liquid d1 vs RightNow System Zero
- Microsoft-Decision-1 vs RightNow System Zero
- Drex 1.5 vs RightNow System Zero
- OpenAI Decisions API vs RightNow System Zero
- pplx-decider-flash vs RightNow System Zero
- pplx-decider vs RightNow System Zero
- RightNow System Zero vs ScaleDown
- RightNow System Zero vs SPEV
- RightNow System Zero vs kettei
- RightNow System Zero vs Strands Decider 2B
- RightNow System Zero vs Jev
- RightNow System Zero vs Vela 2.0
Machine-readable
- This page as Markdown
/compare/celeris-1-decision-vs-rightnow-system-zero.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/celeris-1-decision.json·/api/v1/tools/rightnow-system-zero.json - From a terminal
anchor compare celeris-1-decision rightnow-system-zero(the CLI) - Over MCP
compare_tools {"a": "celeris-1-decision", "b": "rightnow-system-zero"}at/mcp, no key