From de1d97a54096f69e03fd1e4dc3dbaef1ee18632e Mon Sep 17 00:00:00 2001
From: Farrel Darian <62016900+fdarian@users.noreply.github.com>
Date: Sat, 4 Apr 2026 16:47:16 +0700
Subject: [PATCH 1/2] fix: retry models.dev fetch without -reasoning suffix on
 404

Some providers (e.g. xAI) use "-reasoning" suffix in AI SDK model IDs,
but models.dev treats reasoning as the default (no suffix). When the
initial fetch 404s, retry with the suffix stripped.
---
 packages/ai/src/pricing/model-price.ts | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/packages/ai/src/pricing/model-price.ts b/packages/ai/src/pricing/model-price.ts
index 914d28a..8c70d40 100644
--- a/packages/ai/src/pricing/model-price.ts
+++ b/packages/ai/src/pricing/model-price.ts
@@ -71,11 +71,11 @@ class ModelsDevData extends Schema.Class<ModelsDevData>('ff-ai/ModelsDevData')({
 	}
 }
 
-const fetchModelsDev = (model: ModelInput) =>
+const modelsDevUrl = (provider: string, modelId: string) =>
+	`https://raw.githubusercontent.com/sst/models.dev/refs/heads/dev/providers/${provider}/models/${modelId}.toml`;
+
+const fetchModelsDevByUrl = (url: string) =>
 	Effect.gen(function* () {
-		const url = `https://raw.githubusercontent.com/sst/models.dev/refs/heads/dev/providers\
-/${ModelInput.getProvider(model)}/\
-models/${ModelInput.getModelId(model)}.toml`;
 		const response = yield* HttpClient.get(url);
 		const text = yield* response.text;
 		if (response.status === 404) {
@@ -94,6 +94,21 @@ models/${ModelInput.getModelId(model)}.toml`;
 		return yield* Schema.decodeUnknown(ModelsDevData)(parsed);
 	});
 
+/** models.dev treats reasoning as default (no suffix), so retry without it on 404 */
+const fetchModelsDev = (model: ModelInput) =>
+	Effect.gen(function* () {
+		const provider = ModelInput.getProvider(model);
+		const modelId = ModelInput.getModelId(model);
+		const result = yield* fetchModelsDevByUrl(modelsDevUrl(provider, modelId));
+		if (result != null) return result;
+
+		if (modelId.endsWith('-reasoning')) {
+			const stripped = modelId.replace(/-reasoning$/, '');
+			return yield* fetchModelsDevByUrl(modelsDevUrl(provider, stripped));
+		}
+		return null;
+	});
+
 const calcCost = (token: number, pricePerMillion: PricePerMillion) =>
 	Usd.make((token * pricePerMillion) / 1_000_000);
 

From 4b0d8efccb4b827245beca6381c72dca21652f13 Mon Sep 17 00:00:00 2001
From: Farrel Darian <62016900+fdarian@users.noreply.github.com>
Date: Sat, 4 Apr 2026 16:47:25 +0700
Subject: [PATCH 2/2] docs: changeset

---
 .changeset/fix-models-dev-reasoning.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/fix-models-dev-reasoning.md

diff --git a/.changeset/fix-models-dev-reasoning.md b/.changeset/fix-models-dev-reasoning.md
new file mode 100644
index 0000000..1c4fb14
--- /dev/null
+++ b/.changeset/fix-models-dev-reasoning.md
@@ -0,0 +1,5 @@
+---
+'ff-ai': patch
+---
+
+Fix models.dev price lookup for model IDs with `-reasoning` suffix by retrying without the suffix on 404