diff --git a/docs/guide/new-backend.md b/docs/guide/new-backend.md
index 2f01db3e7..07f6a1cc8 100644
--- a/docs/guide/new-backend.md
+++ b/docs/guide/new-backend.md
@@ -28,12 +28,18 @@ A single `base_url` + `api_key` pair lets you point SkillOpt at, for example:
 | LiteLLM proxy | `http://localhost:4000` | any proxied model |
 | OpenRouter / Fireworks / xAI / … | provider base URL | provider model id |
 | OrcaRouter | `https://api.orcarouter.ai/v1` | `openai/gpt-5.5` |
+| Cheaper Inference | `https://api.cheaperinference.com/v1` | `gpt-5.4-mini` |
 
 [OrcaRouter](https://www.orcarouter.ai) exposes OpenAI, Anthropic, Google,
 DeepSeek and other models behind one OpenAI-compatible endpoint. Its model IDs
 are namespaced by upstream provider (e.g. `openai/gpt-5.5`,
 `anthropic/claude-sonnet-4.6`), so pass a namespaced ID as the model.
 
+Cheaper Inference model IDs are not namespaced (e.g. `gpt-5.4-mini`), so pass
+the bare ID as the model. See its [API docs](https://www.cheaperinference.com/docs)
+for the base URL and its [model list](https://www.cheaperinference.com/markets)
+for the model IDs.
+
 ### Python API
 
 Select and configure the backend directly when embedding SkillOpt as a Python