Gemini Decisions - Complete Parameter Reference
- Use
gemini-decision-1to evaluate text, images, audio, video, and PDFs with yes/no probabilities, single-choice answers, and scores - Returns all answers synchronously; streaming, Batch API, and context caching are not supported
- Only input tokens are billed; output is free. A minimum charge applies per request. See Model pricing
- For conversation or text generation, use the Gemini Native API
https://direct.evolink.ai by default; https://api.evolink.ai is the fallback endpoint.Authorizations
Authenticate with your EvoLink API Key as a Bearer token.
Get an API Key:
Visit the API Key management page.
Request header:
Authorization: Bearer YOUR_API_KEY
Body
The request body accepts only model, input, and questions. Any other field (such as stream) returns 400 invalid_request.
Model ID. Use gemini-decision-1.
This model is not a chat model and only works on this endpoint. For example, sending it to the GPT Decisions endpoint /v1/decisions returns 400 model_endpoint_mismatch.
gemini-decision-1 "gemini-decision-1"
Shared input for all questions: a text string, a single content block, or an array of content blocks (text, image, audio, video, or PDF document). Input cannot be empty. Adjacent text blocks are joined in order with no separator, so add your own spaces or newlines. To pass JSON data, serialize it to a string and send it as text.
1"I was charged twice for my order."
Questions to evaluate, as a map from question key to question: 1 to 1,000 questions. You choose the keys (1 to 64 characters matching [A-Za-z0-9_-]+), and each answer is returned under the same key. The model never sees the keys, so write the full question in instructions.
| Type | Purpose | Main result |
|---|---|---|
noul | Check whether a statement holds | noul: probability of “yes” (0.01 to 0.99) |
choice | Pick one option from a fixed list | choice: the most likely option ID |
score | Rate the input on ordered levels | score: probability-weighted level score |
Each question is evaluated independently against the same input and cannot see the others; question types can be mixed. If questions depend on one another, split them into separate requests. The input and all questions share a 262,144-token context window.
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{ "is_damaged": { "type": "noul", "instructions": "Did the item arrive damaged?" } }
Response
One answer per question, keyed by the question keys in the request
One answer per question, keyed by the question keys in the request. Each answer’s type matches its question. Empty when prompt_feedback.block_reason is set
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Token usage. Only input tokens are billed (total_input_tokens): text, image, audio, video, and PDF tokens cost the same, and output is always 0. A minimum charge applies to each request. See Model pricing for current prices. Context caching is not supported; repeated input is billed separately for each request. If an HTTP 200 response contains prompt_feedback.block_reason, input usage is still billed. If valid usage is not returned, billing uses an estimate.
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Feedback from input content filters. When block_reason is set, the input was blocked, no questions were evaluated, and answers is empty. If returned with HTTP 200, the request is still billed; see usage.
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