Gemini Decision 1 launches with a Decisions API at $0.10 per 1M

Google's new decision model returns probabilities, not text, and bills input only.

By the RouterPlus team · November 11, 2026

Google released Gemini Decision 1 (gemini-decision-1) and a new Decisions API on November 11, 2026. The model answers closed-set questions (yes/no, multiple choice and rubric scores) with probabilities instead of generated text, so every call bills input tokens only.

What changed

New endpoint on the Gemini Developer API (v1beta) only: POST https://generativelanguage.googleapis.com/v1beta/decisions. The google-genai SDK adds decisions.create from version 3.2.
One request carries a shared input (text, images, audio, video or PDFs) and 1 to 1,000 questions, bounded by a 262,144-token context window.
Three question types: noul (yes/no, a probability from 0.01 to 0.99), choice (2 to 255 options) and score (2 to 255 ordered rubric levels). Every answer comes with a confidence score from 0 to 1.
Output tokens are always 0. The shared input is billed once per request, and each question adds tokens for its own instructions and criteria.
No Batch API and no context caching for this model.

Pricing

Google list prices per million tokens, from the Gemini API pricing page on November 11, 2026.

Tier	Input	Output
Free tier	Free	0 tokens billed
Paid tier	$0.10	0 tokens billed

Google's pricing page marks free-tier data as used to improve its products; paid-tier data is not.

Rate limits

From Google's rate-limits page on November 11, 2026.

Tier	Requests per minute	Tokens per minute	Requests per day
Free	200	50,000	10,000
Tier 1	1,500	1,000,000	50,000
Tier 2	5,000	4,000,000	Unlimited
Tier 3	15,000	10,000,000	Unlimited

What it means

Google now sells a model built for decision points in code: request routing, tool selection, policy checks and classification. Teams that generate text and parse it to choose a branch can send typed questions instead and branch on the returned probability and confidence.

What to do

A minimal call, from Google's model page:

curl -X POST "https://generativelanguage.googleapis.com/v1beta/decisions" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "gemini-decision-1", "input": "The blue mug I ordered on Monday arrived cracked on Wednesday.", "questions": {"is_damaged": {"type": "noul", "instructions": "Did the item arrive damaged?"}}}'

Decision models on RouterPlus

Gemini Decision 1 is not in the RouterPlus catalog as of November 11, 2026. RouterPlus serves 13 decision models through POST https://api.routerplus.com/v1/decisions with one API key, among them Parallel Decisions, GPT-6 Luna Decisions, Perplexity Decider v1 27B and Jev 1.13. See the Decisions API docs, our post on Parallel Decisions and Google models on RouterPlus.