> ## Documentation Index
> Fetch the complete documentation index at: https://secndai.manicule.dev/llms.txt
> Use this file to discover all available pages before exploring further.
> For every page in one file, fetch https://secndai.manicule.dev/llms-full.txt (large).
> To search and read these docs as tools, connect the MCP server at https://secndai.manicule.dev/api/mcp.
> Every agent surface: https://secndai.manicule.dev/.well-known/llms-manifest.json

# Models (/models)

<!-- agent-signals: reading_time_min: 1 · est_tokens: 487 · updated: 2026-11-12 -->
Related: [Introduction](/index.md), [Quickstart](/quickstart.md), [Authentication](/authentication.md), [Changelog](/changelog.md), [Confidence and the gate](/confidence.md), [Request limits](/limits.md)

> Pin a model before tuning a workflow.

ren-zero is available through the API only. Model weights are not distributed with the SDKs.

| Identifier            | Meaning                                                                     |
| --------------------- | --------------------------------------------------------------------------- |
| `ren-zero-2026-11-12` | Dated ID used in these examples; use the actual ID returned to your account |
| `ren-zero-latest`     | Alias for the configured stable model                                       |
| `ren-zero-preview`    | Alias for the configured preview model                                      |

A dated name is an identifier, not a benchmark claim or a guarantee that your account can access it. In the current gateway, both aliases resolve to the configured pinned model.

```bash
curl --fail-with-body https://api.secndai.com/v1/models \
  -H "Authorization: Bearer $SECND_API_KEY"
```

The response has a `data` array. Each entry includes `id`, `aliases`, `max_options`, `max_input_tokens`, and `price_per_million_input_tokens_usd`. Decision responses return the resolved ID in both `model` and `usage.model`.

## Version changes

Pin the dated ID when comparing distributions or choosing thresholds. When changing it, reevaluate the full workflow on permitted development data, including human escalation and downstream actions. An alias can change without your application code changing.

## Usage and price

Every successful decision includes `usage.input_tokens`, `usage.output_tokens` (always `0`), and `usage.model`. Input usage is measured on the complete formatted input. The price per million input tokens is operator configuration exposed by model discovery; there is no public fixed price or billing-provider integration promised here.

Local development's configured price is not a commercial offer. Agree production access and pricing with Secnd before relying on them.