# OpenRouter: Quantization and ReasoningFormat enum properties added to API schemas

> OpenRouter added a `Quantization` enum property to the schemas of eight endpoints (chat completions, embeddings, messages, presets, rerank, responses, endpoints, models). A `ReasoningFormat` enum property was added to chat completions and responses endpoints. The embeddings request schema was also updated.

| | |
|---|---|
| **Tool** | openrouter |
| **Version** | — |
| **Kind** | announcement |
| **Published** | 2026-07-27 |
| **Observed** | 2026-08-21 |
| **Significance** | 2/5 |
| **Breaking** | no |
| **Categories** | api-change |

## What changed


- `Quantization` enum property added to: `GET /endpoints/zdr`, `GET /models/{author}/{slug}/endpoints`, `POST /chat/completions`, `POST /embeddings`, `POST /messages`, `POST /presets/{slug}/chat/completions`, `POST /presets/{slug}/messages`, `POST /presets/{slug}/responses`, `POST /rerank`, `POST /responses`
- `ReasoningFormat` enum property added to: `POST /chat/completions`, `POST /presets/{slug}/chat/completions`, `POST /presets/{slug}/responses`, `POST /responses`
- `POST /embeddings`: request schema updated


## Sources

- [blog_rss](https://openrouter.ai/docs/changelog#july-27-2026) — retrieved 2026-08-21


## Community

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---
Canonical: https://changelogs.info/openrouter/openrouter-quantization-and-reasoningformat-enum-properties-added-to-api-schemas
Entity: https://changelogs.info/openrouter
Event ID: `evt_2026-07-27_openrouter_july-27-2026`
Licence: event synthesis © changelogs.info, CC BY 4.0. Linked sources belong to their vendors.