diff --git a/gpt4all-backend/gptj.cpp b/gpt4all-backend/gptj.cpp
index f31b4c60..786967c6 100644
--- a/gpt4all-backend/gptj.cpp
+++ b/gpt4all-backend/gptj.cpp
@@ -867,7 +867,8 @@ void GPTJ::setThreadCount(int32_t n_threads) {
     d_ptr->n_threads = n_threads;
 }
 
-int32_t GPTJ::threadCount() {
+int32_t GPTJ::threadCount() const
+{
     return d_ptr->n_threads;
 }
 
diff --git a/gpt4all-backend/gptj.h b/gpt4all-backend/gptj.h
index 3109c1da..48da82dd 100644
--- a/gpt4all-backend/gptj.h
+++ b/gpt4all-backend/gptj.h
@@ -23,7 +23,7 @@ public:
         std::function<bool(bool)> recalculateCallback,
         PromptContext &ctx) override;
     void setThreadCount(int32_t n_threads) override;
-    int32_t threadCount() override;
+    int32_t threadCount() const override;
 
 protected:
     void recalculateContext(PromptContext &promptCtx,
diff --git a/gpt4all-backend/llamamodel.cpp b/gpt4all-backend/llamamodel.cpp
index 6aa92744..b7cf9780 100644
--- a/gpt4all-backend/llamamodel.cpp
+++ b/gpt4all-backend/llamamodel.cpp
@@ -75,7 +75,8 @@ void LLamaModel::setThreadCount(int32_t n_threads) {
     d_ptr->n_threads = n_threads;
 }
 
-int32_t LLamaModel::threadCount() {
+int32_t LLamaModel::threadCount() const
+{
     return d_ptr->n_threads;
 }
 
diff --git a/gpt4all-backend/llamamodel.h b/gpt4all-backend/llamamodel.h
index 7f487803..f4e07782 100644
--- a/gpt4all-backend/llamamodel.h
+++ b/gpt4all-backend/llamamodel.h
@@ -23,7 +23,7 @@ public:
         std::function<bool(bool)> recalculateCallback,
         PromptContext &ctx) override;
     void setThreadCount(int32_t n_threads) override;
-    int32_t threadCount() override;
+    int32_t threadCount() const override;
 
 protected:
     void recalculateContext(PromptContext &promptCtx,
diff --git a/gpt4all-backend/llmodel.h b/gpt4all-backend/llmodel.h
index 5e254ab5..50c313e6 100644
--- a/gpt4all-backend/llmodel.h
+++ b/gpt4all-backend/llmodel.h
@@ -37,7 +37,7 @@ public:
         std::function<bool(bool)> recalculateCallback,
         PromptContext &ctx) = 0;
     virtual void setThreadCount(int32_t n_threads) {}
-    virtual int32_t threadCount() { return 1; }
+    virtual int32_t threadCount() const { return 1; }
 
 protected:
     virtual void recalculateContext(PromptContext &promptCtx,
diff --git a/gpt4all-backend/mpt.cpp b/gpt4all-backend/mpt.cpp
index 42a2aaae..e002b63c 100644
--- a/gpt4all-backend/mpt.cpp
+++ b/gpt4all-backend/mpt.cpp
@@ -792,7 +792,8 @@ void MPT::setThreadCount(int32_t n_threads) {
     d_ptr->n_threads = n_threads;
 }
 
-int32_t MPT::threadCount() {
+int32_t MPT::threadCount() const
+{
     return d_ptr->n_threads;
 }
 
diff --git a/gpt4all-backend/mpt.h b/gpt4all-backend/mpt.h
index 9e693f6a..15122d6e 100644
--- a/gpt4all-backend/mpt.h
+++ b/gpt4all-backend/mpt.h
@@ -23,7 +23,7 @@ public:
         std::function<bool(bool)> recalculateCallback,
         PromptContext &ctx) override;
     void setThreadCount(int32_t n_threads) override;
-    int32_t threadCount() override;
+    int32_t threadCount() const override;
 
 protected:
     void recalculateContext(PromptContext &promptCtx,
diff --git a/gpt4all-chat/chatgpt.cpp b/gpt4all-chat/chatgpt.cpp
index b2f833a4..64637907 100644
--- a/gpt4all-chat/chatgpt.cpp
+++ b/gpt4all-chat/chatgpt.cpp
@@ -32,7 +32,7 @@ void ChatGPT::setThreadCount(int32_t n_threads)
     qt_noop();
 }
 
-int32_t ChatGPT::threadCount()
+int32_t ChatGPT::threadCount() const
 {
     return 1;
 }
diff --git a/gpt4all-chat/chatgpt.h b/gpt4all-chat/chatgpt.h
index ef0f6ef5..62913ded 100644
--- a/gpt4all-chat/chatgpt.h
+++ b/gpt4all-chat/chatgpt.h
@@ -25,7 +25,7 @@ public:
         std::function<bool(bool)> recalculateCallback,
         PromptContext &ctx) override;
     void setThreadCount(int32_t n_threads) override;
-    int32_t threadCount() override;
+    int32_t threadCount() const override;
 
     void setModelName(const QString &modelName) { m_modelName = modelName; }
     void setAPIKey(const QString &apiKey) { m_apiKey = apiKey; }