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Head to head · Decision models · October 2026 research run

OpenAI Decisions API vs SPEV

OpenAI Decisions API scores 71.5 (BB) on agent readiness against SPEV's 51.1 (D), and leads in 6 of 7 scored categories. Both do decision models.

Best decision models for AI agents · All 136 decisions comparisons

OpenAI Decisions APIOpenAI · Model API BB71.5/100#127 of 1094 SPEVSprag · Model API D51.1/100#819 of 1094

Which one, for what

OpenAI Decisions API BB

Best for High-volume yes or no checks, routing among fixed options and rubric scoring over text and images, for teams already on an OpenAI key.

Ahead on

  • Reliability, 53 against 45
  • Schema & documentation, 89 against 81
  • Agent ergonomics, 87 against 76
  • Security & auth, 83 against 33
  • Maintenance & community, 77 against 49
  • Transparency & trust, 83 against 54

Also in its favour

  • Agent-ready, a grade of BB or better

Watch for

Public beta released on 6 October 2026. The guide expects general availability in the coming weeks and gives no date

SPEV D

Best for Typed decisions over raw audio, such as end-of-turn detection, call triage and flagging, plus text and single images, hosted or self-hosted.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

Published on 14 October 2026, with no service record, no status page and no API changelog

Score by category

CategoryWeight this runOpenAI Decisions APISPEVEdge
Reliability16%205345OpenAI Decisions API +8
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28981OpenAI Decisions API +8
Agent ergonomics13%16.28776OpenAI Decisions API +11
Security & auth14%17.58333OpenAI Decisions API +50
Payments & pricing10%12.53030even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87749OpenAI Decisions API +28
Transparency & trust7%8.88354OpenAI Decisions API +29
Negative events≤150-2
TotalBB 71.5/100D 51.1/100

Facts side by side

FactOpenAI Decisions APISPEV
KindModel APIModel API
VendorOpenAISprag
Hosted endpointhttps://api.openai.com/v1/decisionshttps://api.sprag.ai/v1/decisions
TransportsHTTPHTTP
AuthAPI keyAPI key
PricingPay per usePay per use
Price for decision models$0.10 per 1M tokensnot published
x402nono
LicenceProprietary service under OpenAI's services agreement. The official SDKs are Apache-2.0Apache-2.0 (weights and inference code, following the Qwen3-Omni base). Training code and data aren't published
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-062026-10-14
Terms last updatedcouldn't be read2026-09-01
Privacy policy last updatedcouldn't be read2026-08-01
Customer content may train modelscouldn't be readyes, with an opt-out
Terms restrict automated accesscouldn't be readnot found in the text
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
Popularity32k starsnone

Verdicts

OpenAI Decisions API

Typed predicate, choice and score answers with probabilities, up to 200 questions a call, at $0.10 per million input tokens with no output charge. It is a public beta released on 6 October 2026, with one model alias, no dated snapshot, no Batch route and no SLA found.

SPEV

SPEV answers typed questions over text, audio or an image in one call, with a public OpenAPI schema and Apache-2.0 weights on Hugging Face. It is a day old, has an 8,192-token context, no status page or changelog, and Sprag's terms let it train on API content unless the customer opts out by email.

Before you call either

OpenAI Decisions API

  1. Put independent questions about one input in a single questions array. Send a separate request when a question depends on an earlier answer
  2. Check each answer's type before reading it. A question can come back as refusal while the others in the same request are answered
  3. Encode images as base64 data URLs. Hosted URLs and file_id inputs are rejected
  4. Give a choice question a fallback value such as other, and set thresholds from your own labelled examples
  5. Use Python SDK 3.26.0 or JavaScript 7.30.0 or later, and follow Retry-After on 429 and 503

SPEV

  1. Send model: "spev" to POST https://api.sprag.ai/v1/decisions with a bearer key. /v1/systemone returns 410
  2. Ask every question about one piece of evidence in one request. Answers come back in question order
  3. Send audio as base64 in input_audio with format, not as a data URL, and at most one image across all messages
  4. Keep evidence and questions under 8,192 tokens. Over the limit returns 400 model_limit_exceeded
  5. Back off on 429 and 503 for Retry-After seconds. Limits are 60 requests a minute per organisation by default
  6. Handle an answer of type refusal, which carries no probabilities

Questions

Which is better for AI agents, OpenAI Decisions API or SPEV?

OpenAI Decisions API scores 71.5 (BB) on agent readiness against SPEV's 51.1 (D), and leads in 6 of 7 scored categories.

Do OpenAI Decisions API and SPEV need an API key?

Both need an API key.

Can an agent call OpenAI Decisions API and SPEV without installing anything?

Yes. OpenAI Decisions API has a hosted endpoint at https://api.openai.com/v1/decisions and SPEV at https://api.sprag.ai/v1/decisions.

Other comparisons with OpenAI Decisions API or SPEV

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