diff --git a/packages/opencode/src/provider/transform.ts b/packages/opencode/src/provider/transform.ts
index b52c94cc09..cc0fcff8d3 100644
--- a/packages/opencode/src/provider/transform.ts
+++ b/packages/opencode/src/provider/transform.ts
@@ -197,7 +197,7 @@ function normalizeMessages(
   }
 
   // Deepseek requires all assistant messages to have reasoning on them
-  if (model.api.id.includes("deepseek")) {
+  if (model.api.id.toLowerCase().includes("deepseek")) {
     msgs = msgs.map((msg) => {
       if (msg.role !== "assistant") return msg
       if (Array.isArray(msg.content)) {
@@ -573,7 +573,7 @@ export function variants(model: Provider.Model): Record<string, Record<string, a
     // https://docs.venice.ai/overview/guides/reasoning-models#reasoning-effort
     case "@ai-sdk/openai-compatible":
       const efforts = [...WIDELY_SUPPORTED_EFFORTS]
-      if (model.api.id.includes("deepseek-v4")) {
+      if (model.api.id.toLowerCase().includes("deepseek-v4")) {
         efforts.push("max")
       }
       return Object.fromEntries(efforts.map((effort) => [effort, { reasoningEffort: effort }]))