From 6847d93ee88650816fe13cf62df3bf0c3a394eb0 Mon Sep 17 00:00:00 2001
From: Kamenka Dzmitry <81700662+kamenkadmitry@users.noreply.github.com>
Date: Thu, 16 Jul 2026 13:48:27 +0200
Subject: [PATCH] fix(embeddings): remove non-existent voyage-multilingual-3.5,
 add missing models

Cherry-picked from PR #7425 (org-fork branch cannot receive pushes; the PR
stays open for reference). Refs #7425
---
 .../fixes/7425-voyage-embedding-models.md     |  1 +
 open-sse/config/embeddingRegistry.ts          |  4 ++-
 ...embedding-rerank-provider-registry.test.ts | 25 +++++++++++++++++++
 3 files changed, 29 insertions(+), 1 deletion(-)
 create mode 100644 changelog.d/fixes/7425-voyage-embedding-models.md

diff --git a/changelog.d/fixes/7425-voyage-embedding-models.md b/changelog.d/fixes/7425-voyage-embedding-models.md
new file mode 100644
index 0000000000..3ac41f57eb
--- /dev/null
+++ b/changelog.d/fixes/7425-voyage-embedding-models.md
@@ -0,0 +1 @@
+- fix(embeddings): remove the non-existent `voyage-multilingual-3.5` from the embedding registry and add the missing Voyage models (#7425 — thanks @kamenkadmitry)
diff --git a/open-sse/config/embeddingRegistry.ts b/open-sse/config/embeddingRegistry.ts
index 54a9cf2103..dde332c337 100644
--- a/open-sse/config/embeddingRegistry.ts
+++ b/open-sse/config/embeddingRegistry.ts
@@ -258,7 +258,9 @@ export const EMBEDDING_PROVIDERS: Record<string, EmbeddingProvider> = {
       { id: "voyage-4", name: "Voyage 4", dimensions: 1024 },
       { id: "voyage-4-lite", name: "Voyage 4 Lite", dimensions: 1024 },
       { id: "voyage-3-large", name: "Voyage 3 Large", dimensions: 1024 },
-      { id: "voyage-multilingual-3.5", name: "Voyage Multilingual 3.5", dimensions: 1024 },
+      { id: "voyage-3.5", name: "Voyage 3.5", dimensions: 1024 },
+      { id: "voyage-3.5-lite", name: "Voyage 3.5 Lite", dimensions: 512 },
+      { id: "voyage-multilingual-2", name: "Voyage Multilingual 2", dimensions: 1024 },
       { id: "voyage-code-3", name: "Voyage Code 3", dimensions: 1024 },
       { id: "voyage-code-2", name: "Voyage Code 2", dimensions: 1536 },
       { id: "voyage-finance-2", name: "Voyage Finance 2", dimensions: 1024 },
diff --git a/tests/unit/embedding-rerank-provider-registry.test.ts b/tests/unit/embedding-rerank-provider-registry.test.ts
index a4e0129e45..de96830f0e 100644
--- a/tests/unit/embedding-rerank-provider-registry.test.ts
+++ b/tests/unit/embedding-rerank-provider-registry.test.ts
@@ -28,6 +28,31 @@ test("voyage-ai embedding registry exposes current embedding models", () => {
   assert.ok(all.length >= 3);
 });
 
+// #7351: voyage-multilingual-3.5 does not exist in the Voyage AI API — it was
+// added to the registry by mistake and caused HTTP 400 on every test/request.
+// voyage-multilingual-2 is the real model and was missing from the registry.
+test("#7351 voyage-ai registry does not list non-existent voyage-multilingual-3.5", () => {
+  const provider = getEmbeddingProvider("voyage-ai");
+  assert.ok(provider);
+  assert.ok(
+    !provider.models.some((model) => model.id === "voyage-multilingual-3.5"),
+    "voyage-multilingual-3.5 must not be in the registry — it does not exist in the Voyage AI API"
+  );
+});
+
+test("#7351 voyage-ai registry includes voyage-multilingual-2 (real model)", () => {
+  const provider = getEmbeddingProvider("voyage-ai");
+  assert.ok(provider);
+  assert.ok(provider.models.some((model) => model.id === "voyage-multilingual-2"));
+});
+
+test("#7351 voyage-ai registry includes voyage-3.5 and voyage-3.5-lite", () => {
+  const provider = getEmbeddingProvider("voyage-ai");
+  assert.ok(provider);
+  assert.ok(provider.models.some((model) => model.id === "voyage-3.5"));
+  assert.ok(provider.models.some((model) => model.id === "voyage-3.5-lite"));
+});
+
 test("voyage-ai and jina-ai rerank registries expose supported models", () => {
   const voyage = getRerankProvider("voyage-ai");
   const jina = getRerankProvider("jina-ai");