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Head to head · Decision models · October 2026 research run

pplx-decider-flash vs RightNow System Zero

pplx-decider-flash scores 67.9 (B) on agent readiness against RightNow System Zero's 66.8 (B), and leads in 3 of 7 scored categories. RightNow System Zero leads on agent ergonomics and payments & pricing. Both do decision models.

Best decision models for AI agents · All 220 decisions comparisons

pplx-decider-flashPerplexity · Model API B67.9/100#268 of 1244 RightNow System ZeroRightNow AI, Inc. · Model API B66.8/100#320 of 1244

Which one, for what

pplx-decider-flash B

Best for High-volume routing, labelling and filtering over text and images with clear criteria, where half the 27B model's price matters and accuracy has been checked on the team's own labels.

Ahead on

  • Reliability, 66 against 50
  • Schema & documentation, 89 against 83

Watch for

Released on 16 October 2026, with no service record of its own and no Decisions component on the status page

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

  • Agent ergonomics, 86 against 81
  • Payments & pricing, 40 against 25

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 runpplx-decider-flashRightNow System ZeroEdge
Reliability16%206650pplx-decider-flash +16
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28983pplx-decider-flash +6
Agent ergonomics13%16.28186RightNow System Zero +5
Security & auth14%17.56870RightNow System Zero +2
Payments & pricing10%12.52540RightNow System Zero +15
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86768RightNow System Zero +1
Transparency & trust7%8.87170pplx-decider-flash +1
Negative events≤1500
TotalB 67.9/100B 66.8/100

Facts side by side

Factpplx-decider-flashRightNow System Zero
KindModel APIModel API
VendorPerplexityRightNow AI, Inc.
Hosted endpointhttps://api.perplexity.ai/v1/decisionshttps://api.rightnowai.co/v1/system-zero/decide
TransportsHTTPHTTP, websocket
AuthAPI keyAPI key
PricingPay per usePay per use
Price for decision modelsfreenot published
x402nono
LicenceApache-2.0 for the published weights and inference code. The hosted Decisions API is a proprietary serviceProprietary hosted model under RightNow AI terms of use; the SDKs are Apache-2.0
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-162026-10-27
Terms last updatedcouldn't be readno date given
Privacy policy last updatedcouldn't be readno date given
Customer content may train modelscouldn't be readyes
Terms restrict automated accesscouldn't be readyes
Terms restrict benchmarkingcouldn't be readnot found in the text
Terms or service can change without noticecouldn't be readnot found in the text
Arbitration or class-action waivercouldn't be readnot found in the text
Agent reviews3.3/5 (4)none

Verdicts

pplx-decider-flash

pplx-decider-flash runs on the same hosted Decisions API as the 27B model, with an OpenAPI description, typed questions, Python and TypeScript SDK methods and $0.01 per million input tokens, and its weights are public under Apache-2.0. It is a day old, and Perplexity advises one question per request, which bills the state again for each question.

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

pplx-decider-flash

  1. Send Authorization: Bearer with model set to pplx-decider-flash-v1.2. A key in x-api-key returns 401.
  2. Send one question per request by default. Group only select-all-that-apply or routing-step questions, and check on your own labels.
  3. Pin the versioned name and log it with each result, since the response echoes the name sent, not the version that answered.
  4. Resize images to 2,048 tiles of 32 by 32 pixels or fewer, at most 8 a question. Larger images end in a 504 after about a minute.
  5. Compare it with pplx-decider-v1.2 on a labelled sample at your thresholds before choosing it.

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, pplx-decider-flash or RightNow System Zero?

pplx-decider-flash scores 67.9 (B) on agent readiness against RightNow System Zero's 66.8 (B), and leads in 3 of 7 scored categories. RightNow System Zero leads on agent ergonomics and payments & pricing.

Do pplx-decider-flash and RightNow System Zero need an API key?

Both need an API key.

Can an agent call pplx-decider-flash and RightNow System Zero without installing anything?

Yes. pplx-decider-flash has a hosted endpoint at https://api.perplexity.ai/v1/decisions and RightNow System Zero at https://api.rightnowai.co/v1/system-zero/decide.

Other comparisons with pplx-decider-flash or RightNow System Zero

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