# OpenAI Decisions API vs SPEV

> OpenAI Decisions scores 71.5 (BB) to SPEV's 51.1 (D) for decision models. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/openai-decisions-api-vs-sprag-spev
- Markdown: https://www.anchorterminal.com/compare/openai-decisions-api-vs-sprag-spev.md (~2,650 tokens)
- Slim: https://www.anchorterminal.com/compare/openai-decisions-api-vs-sprag-spev.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/openai-decisions-api-vs-sprag-spev.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Licence: CC BY 4.0, credit required: when you show, quote or pass on anything from here (to a user in an answer, in a product, a report or a dataset), say it's from Anchor Terminal (anchorterminal.com) and link the page or API address you took it from. Reviews also credit their author.
- Updated: 2026-10-15

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.

- OpenAI Decisions API: grade BB, 71.5/100, rank #127 of 1094. Markdown https://www.anchorterminal.com/tools/openai-decisions-api.md · JSON https://www.anchorterminal.com/api/v1/tools/openai-decisions-api.json
- SPEV: grade D, 51.1/100, rank #819 of 1094. Markdown https://www.anchorterminal.com/tools/sprag-spev.md · JSON https://www.anchorterminal.com/api/v1/tools/sprag-spev.json
- Best decision models for AI agents: https://www.anchorterminal.com/best/decision-models/index.md
- All 136 decisions comparisons: https://www.anchorterminal.com/compare/decision-models/index.md

## Which one, for what

### OpenAI Decisions API (BB)

Good 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)

Good 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.

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


## Score by category

| Category | Weight | OpenAI Decisions API | SPEV | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 53 | 45 | OpenAI Decisions API +8 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 89 | 81 | OpenAI Decisions API +8 |
| Agent ergonomics | 13% (16.2 this run) | 87 | 76 | OpenAI Decisions API +11 |
| Security & auth | 14% (17.5 this run) | 83 | 33 | OpenAI Decisions API +50 |
| Payments & pricing | 10% (12.5 this run) | 30 | 30 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 77 | 49 | OpenAI Decisions API +28 |
| Transparency & trust | 7% (8.8 this run) | 83 | 54 | OpenAI Decisions API +29 |
| Negative events | ≤15 | 0 | -2 | |
| **Total** | | **71.5 · BB** | **51.1 · D** | |

## Facts side by side

| Fact | OpenAI Decisions API | SPEV |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | OpenAI | Sprag |
| Hosted endpoint | `https://api.openai.com/v1/decisions` | `https://api.sprag.ai/v1/decisions` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| Price for decision models | $0.10 per 1M tokens | not published |
| x402 | no | no |
| Licence | Proprietary service under OpenAI's services agreement. The official SDKs are Apache-2.0 | Apache-2.0 (weights and inference code, following the Qwen3-Omni base). Training code and data aren't published |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-06 | 2026-10-14 |
| Terms last updated | couldn't be read | 2026-09-01 |
| Privacy policy last updated | couldn't be read | 2026-08-01 |
| Customer content may train models | couldn't be read | yes, with an opt-out |
| Terms restrict automated access | couldn't be read | not found in the text |
| Terms restrict benchmarking | couldn't be read | not found in the text |
| Terms or service can change without notice | couldn't be read | not found in the text |
| Arbitration or class-action waiver | couldn't be read | not found in the text |
| Popularity | 32k stars | none |

## 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.


## For agents

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

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