# Liquid AI Releases d1: A Decision Model That Returns Calibrated Probabilities With Zero Output Tokens > Source: > Published: 2026-09-29 21:47:09+00:00 **Liquid AI has released [d1](https://docs.liquid.ai/lfm/models/decision-models), a decision model built for structured choices instead of text generation.** You give it context and a set of typed questions. It returns calibrated probabilities across a fixed set of outcomes in a single call, with zero generated tokens. The target is the work many teams still send to general LLMs: classification, ticket routing, scoring, moderation, reranking and LLM-as-judge checks. **Is it deployable?** Yes, today, as a hosted API. d1 runs on the Liquid API under the model name `d1:free`. Liquid’s [model library](https://docs.liquid.ai/lfm/models/complete-library) lists it as API only and not trainable, so there are no GGUF, MLX or ONNX weights to self-host. ## **What is a Decision Model?** A decision model evaluates a situation and returns a typed answer from options you define before the call. It does not write text. In every response, `usage.output_tokens` is 0. Liquid AI’s [migration guide](https://docs.liquid.ai/guides/decision-model-guide) gives a simple rule: if the answer is one of N known options, use a decision model. If the model must compose a new string, keep your LLM. ## **The 3 Primitives: Noul, Choice and Score** - **Noul** is a yes/no question that returns a probability between 0 and 1. In Liquid’s example, ‘Is this message a complaint?’ returned 0.999. - **Choice** picks one option from a named set. It returns the top pick, the full distribution and a`confidence` value. A double-charge ticket scored 0.9997 on ‘billing.’ - **Score** rates input on an ordered rubric and returns a probability-weighted position. Levels are indexed from 0, so a 4-level urgency rubric spans 0 to 3. A production outage scored 2.9995. You can mix all 3 types in one request. The model evaluates every question against the same state in one round trip. ## **How a d1 API Call Works** Each request has 3 parts: the model, the state (plain text or a JSON object) and the questions. Calls go to `POST https://api.liquid.ai/decisions/v1/systemone`. Keys come from [console.liquid.ai](https://console.liquid.ai/) and start with `liquid_`. The clients are TypeSafe AI’s [typesafe-sdk](https://pypi.org/project/typesafe-sdk/) for Python and [@typesafe-ai/sdk](https://www.npmjs.com/package/@typesafe-ai/sdk) for TypeScript. ``` python from typesafe_sdk import TypeSafeClient, Noul client = TypeSafeClient(api_key=os.environ["LIQUID_API_KEY"], base_url="https://api.liquid.ai") result = client.system_one( model="d1:free", state="I have been waiting over three weeks for my order...", questions={"is_complaint": Noul( instructions="Is this message a complaint from the customer?")}, ) print(result.answers["is_complaint"].noul) # 0.999 ``` ## **Why Move LLM Classification Calls to d1** **The migration guide lists the concrete differences against an LLM with structured output:** - **No billed output tokens** : An LLM bills output even for a one-word label. - **Predictable latency** : There is no decoding loop that grows with output length. - **No schema errors:** Answers always match the question type, so malformed JSON and retries go away. - **Usable uncertainty** : You get calibrated probabilities instead of a self-reported number. - **Fewer round trips** : 3 sequential classification calls become 1. Probabilities make thresholds practical. Liquid’s moderation example blocks above 0.8, allows below 0.2 and sends the middle band to human review. Its routing example falls back to the most capable model tier when router confidence drops below 0.5. Liquid also says repeated evaluations of the same input are more consistent, which reduces verdict flips. Keep an LLM for summarization, drafting, multi-turn chat, code generation and complex multi-step reasoning. ## **Demo: Road Decider** Liquid’s [road-decider cookbook](https://github.com/Liquid4All/cookbook/tree/main/examples/road-decider) is a pixel-art survival racer. d1 uses a Choice question to pick left, center or right on every decision tick, about 2 to 5 times per second depending on game speed. The app is vanilla JavaScript on Node.js 18+, with a Vite proxy that keeps the API key server-side. A “Jev vs d1” mode races d1 against TypeSafe’s `typesafe/jev-1.13` through OpenRouter. The most useful lesson is about state design. Per-lane summaries with distance to the first obstacle produced more confident decisions than a raw grid of the road. ## **Interactive Explainer: d1 Step by Step** ## **d1 vs Closest Competitors** d1 enters a small but fast-moving category of non-generative decision models. Here is how it compares on published features. | Feature | Liquid AI d1 | TypeSafe Jev 1.13 | Convai Laya | AutoTrust JEV-27B | |---|---|---|---|---| | **Access** | [Liquid API only](https://docs.liquid.ai/lfm/models/complete-library) | [OpenRouter API](https://openrouter.ai/typesafe/jev-1.13) | [Open weights](https://huggingface.co/convaiinnovations/laya) | [Open weights](https://huggingface.co/blog/autotrust/autotrustjev-27b-fast-calibrated-decisions-and-ful) | | **Primitives** | Noul, Choice, Score | Noul, Choice, Score | Noul, Choice, Score | True/false, Choice (2 to 16), Score (0 to 5) | | **Output tokens** | 0 | 0 (output billed at $0) | 0 (encoder) | 0 for decisions; can also generate text | | **Context window** | Not published | [32K tokens](https://openrouter.ai/docs/guides/community/jev) | 512 (English), 1,024 (multilingual) | 4,096 tokens | | **Model size** | Not disclosed | Not disclosed | 421M (English), 322M (multilingual) | 27B backbone, 108.9M trainable | | **Pricing** | `d1:free` tier; paid rates not published | $0.042 per 1M input tokens | Self-hosted | Self-hosted | | **License** | Hosted API | Hosted API | Apache 2.0 | Apache 2.0 | | **Fine-tuning** | Not trainable | Not documented | Yes | Yes (LoRA adapter) | | **SDK** | TypeSafe SDK (Python, TS) | TypeSafe SDK, OpenRouter SDKs | Hugging Face | Hugging Face | *Data checked September 29, 2026 against each vendor’s primary page.* ## **Key Takeaways** - d1 returns typed decisions with calibrated probabilities and 0 output tokens. - 3 primitives cover most bounded tasks: Noul, Choice and Score. - Deployable now through the Liquid API as `d1:free` ; no self-hosted weights. - Best fit: routing, moderation, triage, reranking and LLM-as-judge replacement. - Keep LLMs for generation, conversation and multi-step reasoning. Check out the **[Decision Models docs](https://docs.liquid.ai/lfm/models/decision-models),** the [**Migration Guide**](https://docs.liquid.ai/guides/decision-model-guide) and the [** Road Decider demo**](https://github.com/Liquid4All/cookbook/tree/main/examples/road-decider). All credit goes to the researcher of this project. Also, feel free to follow us on **[Twitter](https://x.com/intent/follow?screen_name=marktechpost)** and don’t forget to join our **[150k+ML SubReddit](https://www.reddit.com/r/machinelearningnews/)** and Subscribe to **[our Newsletter](https://magic.beehiiv.com/v1/f5e63dd4-5653-4f09-83e2-321a8b1ba526?email={{email}})**. Wait! are you on telegram? [now you can join us on telegram as well.](https://t.me/machinelearningresearchnews) Need to partner with us for promoting your GitHub Repo OR Hugging Face Page OR Product Release OR Webinar etc.? [Connect with us](https://forms.gle/MJjjVDPS7whH8Ngs6) Asif Razzaq is the CEO of Marktechpost AI Media Inc.. 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