> ## Documentation Index > Fetch the complete documentation index at: https://docs.fastino.ai/llms.txt > Use this file to discover all available pages before exploring further. > ## Agent Instructions > Use https://docs.fastino.ai/llms.txt to discover and navigate pages. Use https://docs.fastino.ai/llms-full.txt when you need the complete documentation corpus. Use https://docs.fastino.ai/openapi.json as the source of truth for customer-facing routes. For GLiDE decision inference, call POST https://api.fastino.ai/v1/systemone with model fastino/GLiDE. Do not infer undocumented routes. Read API keys from FASTINO_API_KEY and never embed credentials in code, logs, or reports. # GLiDE Capabilities > Review GLiDE reasoning behavior, confidence, context limits, and unsupported request shapes. GLiDE evaluates caller-defined outcomes instead of generating prose. This page summarizes its technical behavior and boundaries. For a first request, start with [Call GLiDE](/inference/systemone). ## Decision capabilities * Evaluate a string, object, or array supplied as shared `state`. * Ask one or more named questions against that state. * Use [Noul](/concepts/glide-noul) for yes/no probabilities. * Use [Choice](/concepts/glide-choice) for one unordered option from a caller-defined set. * Use [Score](/concepts/glide-score) for one level on an ordered rubric. * Receive probabilities and confidence for every answer. * Reason over arithmetic, code traces, dates, policies, exceptions, and related facts in the supplied state. GLiDE first makes a fast assessment and spends additional reasoning on uncertain decisions. Each question is evaluated independently against the same state. ## Confidence and uncertainty The answer tells you what GLiDE concluded. `confidence` tells you how clearly the leading outcome separated from the alternatives. | Question type | Confidence formula | Range | | - | - | - | | Noul | Absolute value of `2 × noul − 1` | `0` at maximum uncertainty to `1` at either extreme | | Choice | `top1 − top2` | `0` for a tie to `1` for a dominant option | | Score | `top1 − top2` | `0` for a tie to `1` for a dominant level | A low-confidence answer is not necessarily incorrect. It means probability mass is spread across outcomes. Tune action and fallback thresholds on representative data rather than assuming a universal cutoff. ## Limits * Each rendered prompt—`state` plus one question—must fit within **40,000 tokens**. * Choice requires **2 to 255 options**. * Score accepts up to **255 levels**. * Every question is single-label. There is no multi-label primitive. * One request evaluates one shared `state`; multiple questions belong under `questions`. * `usage.input_tokens` sums internal passes across questions and can exceed 40,000 even when each rendered prompt fits. ## Unsupported request shapes * `/v1/systemone` does not stream. * It does not accept a batch of independent states. * It does not currently accept fine-tuned deployment IDs. * Extra top-level request fields are rejected. * Choice cannot contain only one option. ## Evaluation On Decision Index 0.2.1, GLiDE scored **64.81** compared with Jev's published **57.91**, leading all five evaluation areas and 31 of 38 benchmarks. Review the complete request, response, error handling, and migration guidance. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.