diff --git a/lat.md/cli.md b/lat.md/cli.md
index be0e157..f80be96 100644
--- a/lat.md/cli.md
+++ b/lat.md/cli.md
@@ -321,6 +321,7 @@ Provider is auto-detected from the resolved key prefix:
 
 - `sk-...` — OpenAI (uses `text-embedding-3-small`, 1536 dims)
 - `vck_...` — Vercel AI Gateway (uses `openai/text-embedding-3-small`, 1536 dims)
+- `di_...` — DeepInfra (uses `Qwen/Qwen3-Embedding-0.6B`, 1024 dims; `di_` prefix is stripped before the key is sent)
 - `sk-ant-...` — Anthropic (not supported, errors with guidance)
 - `REPLAY_LAT_LLM_KEY::<url>` — test-only replay server for offline testing
 
diff --git a/lat.md/tests/search.md b/lat.md/tests/search.md
index 843e755..99483f8 100644
--- a/lat.md/tests/search.md
+++ b/lat.md/tests/search.md
@@ -8,7 +8,7 @@ Tests in `tests/search.test.ts`.
 
 ## Provider Detection
 
-Unit tests (always run). Verify `detectProvider` correctly identifies OpenAI (`sk-`), Vercel (`vck_`), rejects Anthropic (`sk-ant-`) with a helpful message, and rejects unknown prefixes.
+Unit tests (always run). Verify `detectProvider` correctly identifies OpenAI (`sk-`), Vercel (`vck_`), DeepInfra (`di_`), rejects Anthropic (`sk-ant-`) with a helpful message, and rejects unknown prefixes. For DeepInfra, also verify that the `di_` prefix is stripped from the key before it appears in the `Authorization` header.
 
 ## RAG Replay Tests
 
diff --git a/src/search/provider.ts b/src/search/provider.ts
index 16ee2b6..2e0c8b6 100644
--- a/src/search/provider.ts
+++ b/src/search/provider.ts
@@ -28,6 +28,17 @@ const vercel: EmbeddingProvider = {
   }),
 };
 
+const deepinfra: EmbeddingProvider = {
+  name: 'deepinfra',
+  apiBase: 'https://api.deepinfra.com/v1/openai',
+  model: 'Qwen/Qwen3-Embedding-0.6B',
+  dimensions: 1024,
+  headers: (key) => ({
+    Authorization: `Bearer ${key.startsWith('di_') ? key.slice('di_'.length) : key}`,
+    'Content-Type': 'application/json',
+  }),
+};
+
 export function detectProvider(key: string): EmbeddingProvider {
   if (key.startsWith('REPLAY_LAT_LLM_KEY::')) {
     const replayUrl = key.slice('REPLAY_LAT_LLM_KEY::'.length);
@@ -46,7 +57,8 @@ export function detectProvider(key: string): EmbeddingProvider {
   }
   if (key.startsWith('vck_')) return vercel;
   if (key.startsWith('sk-')) return openai;
+  if (key.startsWith('di_')) return deepinfra;
   throw new Error(
-    `Unrecognized LAT_LLM_KEY prefix. Supported: OpenAI (sk-...), Vercel AI Gateway (vck_...).`,
+    `Unrecognized LAT_LLM_KEY prefix. Supported: OpenAI (sk-...), Vercel AI Gateway (vck_...), DeepInfra (di_...).`,
   );
 }
diff --git a/tests/search.test.ts b/tests/search.test.ts
index bc284dd..7947b3b 100644
--- a/tests/search.test.ts
+++ b/tests/search.test.ts
@@ -27,6 +27,16 @@ describe('detectProvider', () => {
     expect(p.name).toBe('vercel');
   });
 
+  it('detects DeepInfra key', () => {
+    const p = detectProvider('di_abc123');
+    expect(p.name).toBe('deepinfra');
+  });
+
+  it('strips di_ prefix from DeepInfra key in Authorization header', () => {
+    const p = detectProvider('di_abc123');
+    expect(p.headers('di_abc123').Authorization).toBe('Bearer abc123');
+  });
+
   it('rejects Anthropic key with helpful message', () => {
     expect(() => detectProvider('sk-ant-abc123')).toThrow(/Anthropic/);
   });