# Celeris-1 Decision vs Microsoft-Decision-1

> Celeris-1 Decision scores 49.3 (D) to Microsoft-Decision-1's 39 (E) for decision models. Celeris-1 Decision is cheaper for decision models, $0 against $0 per 1M tokens. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/celeris-1-decision-vs-microsoft-decision-1
- Markdown: https://www.anchorterminal.com/compare/celeris-1-decision-vs-microsoft-decision-1.md (~2,800 tokens)
- Slim: https://www.anchorterminal.com/compare/celeris-1-decision-vs-microsoft-decision-1.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/celeris-1-decision-vs-microsoft-decision-1.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
- Updated: 2026-10-10

Celeris-1 Decision scores 49.3 (D) on agent readiness against Microsoft-Decision-1's 39 (E), and leads in 4 of 7 scored categories. Microsoft-Decision-1 leads on security & auth. Both do decision models. Celeris-1 Decision is cheaper for decision models, $0 against $0 per 1M tokens.

- Celeris-1 Decision: grade D, 49.3/100, rank #798 of 954. Markdown https://www.anchorterminal.com/tools/celeris-1-decision.md · JSON https://www.anchorterminal.com/api/v1/tools/celeris-1-decision.json
- Microsoft-Decision-1: grade E, 39/100, rank #921 of 954. Markdown https://www.anchorterminal.com/tools/microsoft-decision-1.md · JSON https://www.anchorterminal.com/api/v1/tools/microsoft-decision-1.json
- Best decision models for AI agents: https://www.anchorterminal.com/best/decision-models/index.md
- All 91 decisions comparisons: https://www.anchorterminal.com/compare/decision-models/index.md

## Which one, for what

### Celeris-1 Decision (D)

Good for: Multimodal classification, routing and bounded decisions with probabilities and optional explanations

Ahead on:
- Reliability, 40 against 30
- Schema & documentation, 60 against 43
- Agent ergonomics, 80 against 50
- Transparency & trust, 53 against 32

Also in its favour:
- Cheaper for decision models, $0 against $0 per 1M tokens
- A hosted endpoint, with nothing to install

Watch for: Early-access terms and capacity-dependent workspace activation

### Microsoft-Decision-1 (E)

Good for: Routing, classification, prioritisation and rubric checks over text, where a fixed set of options and a low price per token matter more than generated text.

Ahead on:
- Security & auth, 52 against 45

Also in its favour:
- Cheaper for decision models, $0 against $0 per 1M tokens

Watch for: Public preview only. Microsoft's post gives no general availability date and states no licence for the hosted model


## Score by category

| Category | Weight | Celeris-1 Decision | Microsoft-Decision-1 | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 40 | 30 | Celeris-1 Decision +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 60 | 43 | Celeris-1 Decision +17 |
| Agent ergonomics | 13% (16.2 this run) | 80 | 50 | Celeris-1 Decision +30 |
| Security & auth | 14% (17.5 this run) | 45 | 52 | Microsoft-Decision-1 +7 |
| Payments & pricing | 10% (12.5 this run) | 20 | 20 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 40 | 40 | even |
| Transparency & trust | 7% (8.8 this run) | 53 | 32 | Celeris-1 Decision +21 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **49.3 · D** | **39 · E** | |

## Facts side by side

| Fact | Celeris-1 Decision | Microsoft-Decision-1 |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Celeris (Marqo Inc) | Microsoft |
| Hosted endpoint | `https://inference.celeris.ai/celeris-1-decision/v1/systemone` | no (local only) |
| Transports | HTTP | HTTP |
| Auth | API key | OAuth or key |
| Pricing | Pay per use | Pay per use |
| Price for decision models | free | free |
| x402 | no | no |
| Licence | Proprietary hosted model under Celeris terms of service | Not stated. The announcement and OpenRouter's model page name no licence, and no weights repository was found. |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-10-08 | 2026-10-09 |
| Terms last updated | 2026-09-08 | no document linked |
| Privacy policy last updated | 2026-07-23 |  |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | not found in the text |  |
| Terms restrict benchmarking | yes |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | 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.

**Microsoft-Decision-1.** Microsoft publishes $0.042 per million input tokens, with output free, and the model is callable through Microsoft Foundry and OpenRouter. It is in public preview. No licence, model-specific retention statement, rate limit or deprecation policy was found, and the Foundry route needs an Azure deployment and an Entra token. Latency and accuracy figures are Microsoft's claims.

## 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.

### Microsoft-Decision-1

1. Use OpenRouter's Decisions method, not an OpenAI chat-completions SDK. OpenRouter says chat completions SDKs will not work with this model
2. On Foundry, send the request to the deployment's /providers/microsoft/v1/systemone path with a Microsoft Entra token for https://cognitiveservices.azure.com/.default, not an API key
3. Take the deployment name from the Foundry quickstart before the first call. Microsoft says to confirm the route and authentication header, and the pages reviewed do not give the name
4. Keep each request within OpenRouter's 32,768-token context and send only fixed options, since the model is not intended for open-ended generation
5. Measure latency and calibration on your own labelled cases before relying on Microsoft's latency and 'nine times out of 10' statements

## Questions

### Which is better for AI agents, Celeris-1 Decision or Microsoft-Decision-1?

Celeris-1 Decision scores 49.3 (D) on agent readiness against Microsoft-Decision-1's 39 (E), and leads in 4 of 7 scored categories. Microsoft-Decision-1 leads on security & auth.

### Which is cheaper for decision models, Celeris-1 Decision or Microsoft-Decision-1?

Celeris-1 Decision, at free against free for Microsoft-Decision-1. These are the vendors' published prices for the job.

### Do Celeris-1 Decision and Microsoft-Decision-1 need an API key?

Celeris-1 Decision needs an API key. Microsoft-Decision-1 takes an API key or an OAuth sign-in.

### Can an agent call Celeris-1 Decision and Microsoft-Decision-1 without installing anything?

Celeris-1 Decision has a hosted endpoint at https://inference.celeris.ai/celeris-1-decision/v1/systemone. No hosted endpoint is listed for Microsoft-Decision-1.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/celeris-1-decision-vs-microsoft-decision-1.json, and with the fewest tokens: https://www.anchorterminal.com/compare/celeris-1-decision-vs-microsoft-decision-1.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "celeris-1-decision", "b": "microsoft-decision-1"}`. From a terminal: `anchor compare celeris-1-decision microsoft-decision-1`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/celeris-1-decision.json and https://www.anchorterminal.com/api/v1/tools/microsoft-decision-1.json

## Other comparisons with Celeris-1 Decision or Microsoft-Decision-1

- [Celeris-1 Decision vs Clef](https://www.anchorterminal.com/compare/celeris-1-decision-vs-cloudflare-clef.md)
- [Celeris-1 Decision vs Laya](https://www.anchorterminal.com/compare/celeris-1-decision-vs-convai-laya.md)
- [Celeris-1 Decision vs Decider](https://www.anchorterminal.com/compare/celeris-1-decision-vs-decider.md)
- [Celeris-1 Decision vs GLiClass](https://www.anchorterminal.com/compare/celeris-1-decision-vs-gliclass.md)
- [Celeris-1 Decision vs Kev](https://www.anchorterminal.com/compare/celeris-1-decision-vs-jaredpalmer-kev.md)
- [Celeris-1 Decision vs Liquid d1](https://www.anchorterminal.com/compare/celeris-1-decision-vs-liquid-d1.md)
- [Celeris-1 Decision vs Drex 1.5](https://www.anchorterminal.com/compare/celeris-1-decision-vs-nace-drex.md)
- [Celeris-1 Decision vs OpenAI Decisions API](https://www.anchorterminal.com/compare/celeris-1-decision-vs-openai-decisions-api.md)
- [Celeris-1 Decision vs pplx-decider](https://www.anchorterminal.com/compare/celeris-1-decision-vs-pplx-decider.md)
- [Celeris-1 Decision vs Strands Decider 2B](https://www.anchorterminal.com/compare/celeris-1-decision-vs-strands-decider.md)
- [Celeris-1 Decision vs Jev](https://www.anchorterminal.com/compare/celeris-1-decision-vs-typesafe-jev.md)
- [Celeris-1 Decision vs Vela 2.0](https://www.anchorterminal.com/compare/celeris-1-decision-vs-vela.md)
- [Clef vs Microsoft-Decision-1](https://www.anchorterminal.com/compare/cloudflare-clef-vs-microsoft-decision-1.md)
- [Laya vs Microsoft-Decision-1](https://www.anchorterminal.com/compare/convai-laya-vs-microsoft-decision-1.md)
- [Decider vs Microsoft-Decision-1](https://www.anchorterminal.com/compare/decider-vs-microsoft-decision-1.md)
- [GLiClass vs Microsoft-Decision-1](https://www.anchorterminal.com/compare/gliclass-vs-microsoft-decision-1.md)
- [Kev vs Microsoft-Decision-1](https://www.anchorterminal.com/compare/jaredpalmer-kev-vs-microsoft-decision-1.md)
- [Liquid d1 vs Microsoft-Decision-1](https://www.anchorterminal.com/compare/liquid-d1-vs-microsoft-decision-1.md)
- [Microsoft-Decision-1 vs Drex 1.5](https://www.anchorterminal.com/compare/microsoft-decision-1-vs-nace-drex.md)
- [Microsoft-Decision-1 vs OpenAI Decisions API](https://www.anchorterminal.com/compare/microsoft-decision-1-vs-openai-decisions-api.md)
- [Microsoft-Decision-1 vs pplx-decider](https://www.anchorterminal.com/compare/microsoft-decision-1-vs-pplx-decider.md)
- [Microsoft-Decision-1 vs Strands Decider 2B](https://www.anchorterminal.com/compare/microsoft-decision-1-vs-strands-decider.md)
- [Microsoft-Decision-1 vs Jev](https://www.anchorterminal.com/compare/microsoft-decision-1-vs-typesafe-jev.md)
- [Microsoft-Decision-1 vs Vela 2.0](https://www.anchorterminal.com/compare/microsoft-decision-1-vs-vela.md)