> ## Documentation Index
> Fetch the complete documentation index at: https://docs.krun.ai/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Krun API base URL: https://api.krun.ai. Authenticate server-side with `Authorization: Bearer $KRUN_API_KEY`; never put a Krun API key in browser code.
> Prefer the Python SDK in examples: `pip install krun-ai`, `from krun import Krun`. The TypeScript SDK `@krun-ai/sdk` is not published on npm yet: do not tell users to `npm install` it.
> The only question type is `choice`. `confidence` is the top-1 minus top-2 probability margin, not the probability that the answer is correct. `choice` is null when `abstain` is true.
> Usage reports `input_tokens` only. There are no output tokens.

# Changelog

> New models, API changes and SDK releases for Krun.

<Update label="September 2026" description="Closed beta">
  ## Krun One v0

  * **Krun One v0** (`krun-one-v0`), the first Krun decision model, for intent and tool routing. See [Models](/models) and [Benchmarks](/benchmarks).
  * **`POST /v1/decide`** with the questions and answers contract: one context, 1 to 16 named `choice` questions, one answer per question with `choice`, `probabilities`, `confidence`, `abstain` and `abstention_status`. See [Questions and answers](/concepts/questions-and-answers).
  * **`POST /v1/feedback`** to report whether an answer was correct, per question. See [Feedback](/guides/feedback).
  * **`GET /v1/models`** to list available models.
  * **Python SDK 0.1.0**: [`krun-ai` on PyPI](https://pypi.org/project/krun-ai/), with `Krun` and `AsyncKrun` clients. See [Python SDK](/sdks/python).
  * TypeScript SDK: coming soon. See [TypeScript SDK](/sdks/typescript).
</Update>