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

# Changelog

> Dated changes to the OpenType API contract, the Neon 1.1 model and account features, with links to the pages that explain each change in full.

This page records changes to the OpenType API contract and to what an account can do, newest first. Read it when you upgrade a client or when a response differs from what you remember. Each entry links to the page that explains the change in full.

<Update label="2026-09-25" description="Model Router, 256k-token decisions, and response timing">
  ### Model Router

  * **`POST /v1/router/select`.** Classifies a task with Neon 1.1 into one of 27 task types and ranks the models of a benchmark catalog for it, under one of four policies: `balanced`, `cost_efficient`, `capability_heavy` or `domain_skills`. Billed as one decision run; `Idempotency-Key` is optional. See [Model Router](/guides/model-router).
  * **`GET /v1/router/task-types`** and **`GET /v1/router/models`.** The task taxonomy with each type's benchmark weights, and the catalog the router selects from. See [Task types and policies](/guides/router-task-types).

  ### Runs

  * **256k-token decisions.** A Neon 1.1 decision reads up to 262,144 input tokens, up from 3,968. See [Limits](/reference/limits#long-context-decisions).
  * **4 MiB bodies** on `POST /v1/runs` and `POST /v1/router/select`, up from 1 MiB. Other routes keep 1 MiB.
  * **Decision deadlines scale with input.** The default is 30 seconds plus 120 seconds per 262,144 input tokens, at most 150 seconds. Set client timeouts to at least 160 seconds; the official SDKs default to 170 seconds.
  * **Per-run spend ceiling raised to 20,000 micro-USD** (\$0.02), from 5,000, so a full 256k-token read fits. A run holds its ceiling while in flight.
  * **`Server-Timing` on `POST /v1/runs`.** Reports `admit`, `upstream`, `gateway` and `total` time in milliseconds. See [Limits](/reference/limits#response-timing).
</Update>

<Update label="2026-09-24" description="Open sign-up, billing, daily usage, and Neon 1.1">
  ### Accounts and billing

  * **Open sign-up.** Anyone can [create an account](https://console.opentype.dev/sign-up) in the console. Verifying your email adds \$5 of free credit, once per email address. See [Create an account](/getting-started/create-an-account).
  * **Billing routes.** `GET /v1/billing` returns your balance, auto-recharge settings and the last 50 transactions. `POST /v1/billing/checkout` returns a Stripe checkout page for a purchase from $5 to $1,000. `POST /v1/billing/portal` opens the Stripe billing portal for saved cards and receipts. `PUT /v1/billing/auto-recharge` tops your balance up when it falls below a threshold. See [Credits and billing](/guides/credits-and-billing) and [Auto-recharge](/guides/auto-recharge).
  * **`billing_read` scope.** Reading billing needs `billing_read`; buying credits and changing auto-recharge need `billing_write`. See [Scopes](/reference/scopes).
  * **`402 insufficient_credits`.** `POST /v1/runs` refuses a run the balance cannot cover. Nothing is stored, so the same `Idempotency-Key` works once you add credits. See [Handling insufficient credits](/guides/handling-insufficient-credits).

  ### Usage

  * **`GET /v1/usage/daily`.** One row per UTC day with runs, input and output tokens, and spend, zero-filled for quiet days, over a window of up to 92 days. See [Usage reporting](/guides/usage-reporting).

  ### Models

  * **Neon 1.1.** Decision runs are served by Neon 1.1, with the API ids `neon-1.1` and `neon-latest`. See [Models and pricing](/getting-started/models-and-pricing).
  * **Optional `model` field on decision runs.** A decision run may name its model: `"model": "neon-1.1"` or `"model": "neon-latest"`. Any other value is refused with [`400 unknown_model`](/problems/unknown_model).
  * **Model reported in responses.** A live decision response reports `decision.model` as `neon-1.1`. Usage ledger rows report `model_id` `neon-1.1` and `provider` `opentype`.

  ### Requests

  * **`x-request-id` on every response.** Send your own id to have it echoed, or read the one the server mints. It also appears as `error.request_id`. See [Request ids](/reference/request-ids).
  * **1 MiB body cap on every route.** See [Limits](/reference/limits).
  * **Decision alternatives capped at 20 per question**, down from 26. A question with more is refused with `400 invalid_decision_questions`.
</Update>

<Update label="v0.1.0" description="Initial contract">
  * `POST /v1/runs` with two kinds: `decision` (`noul`, `choice` and `score` questions, with `depends_on`, `ask_if`, `alone`, `draws` and `think_tokens`) and `verdict` (a JSON Schema, with the answer validated against it).
  * `GET /v1/runs`, `GET /v1/runs/{run_id}`, and `GET /v1/runs/{run_id}/stream`, which returns a one-time snapshot of the stored run as server-sent events.
  * API keys (`otsk_...`) with scopes, rotation, and idempotent revocation.
  * Usage totals, the per-call ledger, per-run usage, and quota: `GET /v1/usage`, `GET /v1/usage/ledger`, `GET /v1/usage/runs/{run_id}`, `GET /v1/quota`.
</Update>

## Related

* [API reference](/api-reference/introduction) - the current contract, route by route.
* [Conventions](/reference/conventions) - the rules every route follows.
* [Models and pricing](/getting-started/models-and-pricing) - Neon 1.1 and what it costs.
* [Credits and billing](/guides/credits-and-billing) - how credits, holds and purchases work.