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

Celeris-1 Decision D

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

RightNow System Zero B

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

CategoryWeight this runCeleris-1 DecisionRightNow System ZeroEdge
Reliability16%204050RightNow System Zero +10
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26083RightNow System Zero +23
Agent ergonomics13%16.28086RightNow System Zero +6
Security & auth14%17.54570RightNow System Zero +25
Payments & pricing10%12.52040RightNow System Zero +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.84068RightNow System Zero +28
Transparency & trust7%8.85570RightNow System Zero +15
Negative events≤1500
TotalD 49.4/100B 66.8/100

Facts side by side

FactCeleris-1 DecisionRightNow System Zero
KindModel APIModel API
VendorCeleris (Marqo Inc)RightNow AI, Inc.
Hosted endpointhttps://inference.celeris.ai/celeris-1-decision/v1/systemonehttps://api.rightnowai.co/v1/system-zero/decide
TransportsHTTPHTTP, websocket
AuthAPI keyAPI key
PricingPay per usePay per use
Price for decision modelsfreenot published
x402nono
LicenceProprietary hosted model under Celeris terms of serviceProprietary hosted model under RightNow AI terms of use; the SDKs are Apache-2.0
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-082026-10-27
Terms last updated2026-09-08no date given
Privacy policy last updated2026-07-23no date given
Customer content may train modelsnot found in the textyes
Terms restrict automated accessnot found in the textyes
Terms restrict benchmarkingyesnot found in the text
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waivernot found in the textnot 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

  1. Use the decision model path and matching model field. This model has no chat, Responses or models endpoint.
  2. Use at most 512 questions per request, or 64 with explanations. Both endpoints reject streaming.
  3. Preserve x_celeris in a custom Jev SDK response model when reading explanations. The default response type drops it.
  4. Retry 429 with Retry-After and backoff. Stop on 402 until workspace credit is replenished.
  5. Read usage.input_tokens for cost, including images and request overhead. Track credit expiry separately from token consumption.

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.

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

Machine-readable

For companies

Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.