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The public documentation does not verify that AWS, Upstage and Ollama agreed on one shared decision-model API, or that OpenAI declined to join one. It describes separate interfaces: Upstage’s beta Solar Decide endpoint, Ollama’s local System One support, AWS Bedrock’s range of inference APIs, and OpenAI’s own Decisions API. Those are related capabilities, not proof of a shared contract or an agreement’s membership.
What “decision-model API” means
A decision-model API returns structured choices, scores or probabilities rather than simply generating prose. The System One API describes this kind of interaction: a request can provide typed questions and receive decision-oriented outputs. That definition does not, by itself, mean every provider offering an API for decisions uses the same request and response schema. System One API
To establish that providers share an API, documentation or an announcement would need to show a common contract—or a clearly specified adapter that maps providers to it. A similarly named feature, an OpenAI-compatible interface, or support for another inference API is not enough.
What each provider’s documentation establishes
| Provider | Documented interface | What it does—and does not—establish |
|---|---|---|
| Upstage | Solar Decide at /v1/systemone, documented as beta. |
Shows a typed decision interface from Upstage. The provider warns that the schema may change before general availability; it does not establish a multi-provider agreement. |
| Ollama | System One support through a local Ollama server; the API introduction separately documents OpenAI-compatible API base URLs for hosted and local use. | Shows local System One support and a separate compatibility capability. It does not establish that the OpenAI-compatible surface is the same as a shared System One contract. |
| AWS | Amazon Bedrock lists InvokeModel, Converse, Chat Completions, Responses API and Messages API support across its inference endpoints. | Shows a broad set of Bedrock inference APIs, not the same typed decision schema described for System One. Model and feature support depend on endpoint and AWS Region. |
| OpenAI | A first-party POST /decisions endpoint for classification and scoring. |
Shows OpenAI has its own decision interface. It does not establish whether OpenAI signed onto a separate proposed shared API. |
Sources: Upstage API documentation, Ollama API introduction, AWS Bedrock endpoint documentation and OpenAI Decisions API.
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Important differences for developers
Schema and outputs
Do not treat the APIs as interchangeable based on their purpose or names. Compare the actual request and response fields, supported question types, and whether the response contains probabilities or confidence values. The cited documentation does not establish one common schema across these providers.
Where the API runs
Ollama’s API introduction says System One requires a local server and is not available on Ollama Cloud. Its separately documented OpenAI-compatible API base URLs do not change that deployment qualification. Ollama API introduction
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Bedrock’s APIs are AWS-hosted inference interfaces, but the supported models and features vary by endpoint and Region. OpenAI’s help page clarifies that Bedrock’s Responses implementation is operated by AWS and is separate from OpenAI-hosted Responses; availability and behavior can differ. That statement concerns Responses on Bedrock, not System One or the question of whether OpenAI joined a shared decision API. OpenAI’s Bedrock Responses API information
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Upstage explicitly labels Solar Decide beta and warns that its /v1/systemone schema may change before general availability. Treat integrations against that endpoint as subject to change. Upstage API documentation
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- EIGHT CHANNEL LPDDR5X - LPDDR5X is a new ground breaking memory small form factor installed on-board. With blazing speeds up to to 8000MT/s, it runs 1.5x faster than the DDR5 SODIMMs; 90% better performance over DDR5 SODIMMs in video conferencing and photo editing; 30% better performance in productivity apps; 12% better performance in digital content workloads.
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Authentication, billing and model coverage
The cited material does not provide a directly comparable account of authentication, billing or supported models across all four services. Check each provider’s current endpoint documentation for the model and deployment you intend to use; the AWS endpoint page specifically qualifies support by endpoint and Region. The available documentation does not justify a cross-provider price or performance comparison.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Has OpenAI declined to sign on?
That claim is unverified by the cited public API references. OpenAI’s documented Decisions API shows that it offers its own decision-oriented endpoint, but it says nothing about participation in a separate group’s agreement. Conversely, the presence of OpenAI-compatible URLs in Ollama documentation does not show that OpenAI endorsed or joined System One. A claim about signing—or declining to sign—needs a direct announcement or other source that identifies the agreement and its participants.
Quick Recap
How to evaluate a claimed shared API
- Find the original announcement or specification and confirm that it names the participants.
- Check whether the providers implement the same request and response schema, including typed inputs and score or probability fields.
- Distinguish a native implementation from an SDK adapter or a compatibility layer.
- Verify deployment location, supported models, endpoint and regional availability, authentication, billing, and version stability for the specific service you plan to use.
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