diff --git a/gui/chatblockmodel.cpp b/gui/chatblockmodel.cpp
index e9d9e61..de62ad6 100644
--- a/gui/chatblockmodel.cpp
+++ b/gui/chatblockmodel.cpp
@@ -106,80 +106,17 @@ QHash<int, QByteArray> ChatBlockModel::roleNames() const
 void ChatBlockModel::setRawText(const QString &text)
 {
     if (text == m_rawText) return;
-
-    // If text is just appended (common during streaming), only reparse from the last block
-    bool isAppend = text.startsWith(m_rawText) && !m_rawText.isEmpty();
     m_rawText = text;
-
-    if (isAppend && !m_allBlocks.isEmpty()) {
-        reparseIncremental();
-    } else {
-        // Full reparse (session switch, initial load)
-        m_allBlocks.clear();
-        m_lastBlockTextOffset = 0;
-        beginResetModel();
-        m_blocks.clear();
-        m_visibleStart = 0;
-        endResetModel();
-        reparse();
-    }
+    reparse();
     emit rawTextChanged();
 }
 
 static constexpr int INITIAL_BLOCKS = 20;
 static constexpr int LOAD_MORE_COUNT = 30;
 
-void ChatBlockModel::reparseIncremental()
-{
-    // Fast path: just update the last block's content from the raw text tail.
-    // Only do a full reparse if a new block header appeared.
-    QString tail = m_rawText.mid(m_lastBlockTextOffset);
-
-    // Check if a new block header appeared in the NEW portion (after old last-block content)
-    int oldLastBlockLen = m_allBlocks.isEmpty() ? 0 : m_allBlocks.last().content.size();
-    // The header itself is at m_lastBlockTextOffset, content starts after it + newline
-    // Simple heuristic: if the tail contains another header pattern, do full reparse
-    static const QRegularExpression headerRe(
-        R"(^\[(user|assistant|reasoning|call|tool|error|info)(?::([^\]]*))\])",
-        QRegularExpression::MultilineOption);
-    auto it = headerRe.globalMatch(tail);
-    int headerCount = 0;
-    while (it.hasNext()) { it.next(); headerCount++; }
-
-    if (headerCount > 1) {
-        // New block boundary appeared — fall back to full reparse
-        reparse();
-        return;
-    }
-
-    // Common case: just the last block grew. Update its content directly.
-    if (!m_allBlocks.isEmpty()) {
-        QList<ChatBlock> tailBlocks = parseBlocks(tail);
-        if (!tailBlocks.isEmpty()) {
-            m_allBlocks.last() = tailBlocks.last();
-        }
-    }
-
-    updateVisibleWindow();
-}
-
 void ChatBlockModel::reparse()
 {
     m_allBlocks = parseBlocks(m_rawText);
-    // Track where the last block starts for future incremental parses
-    if (!m_allBlocks.isEmpty()) {
-        static const QRegularExpression headerRe(
-            R"(^\[(user|assistant|reasoning|call|tool|error|info)(?::([^\]]*))\])",
-            QRegularExpression::MultilineOption);
-        auto it = headerRe.globalMatch(m_rawText);
-        int lastPos = 0;
-        while (it.hasNext()) {
-            auto match = it.next();
-            lastPos = match.capturedStart();
-        }
-        m_lastBlockTextOffset = lastPos;
-    }
-
     updateVisibleWindow();
 }
 
diff --git a/gui/chatblockmodel.h b/gui/chatblockmodel.h
index 6f3db54..eb12690 100644
--- a/gui/chatblockmodel.h
+++ b/gui/chatblockmodel.h
@@ -74,7 +74,6 @@ signals:
 
 private:
     void reparse();
-    void reparseIncremental();
     void updateVisibleWindow();
     QList<ChatBlock> parseBlocks(const QString &text) const;
     QVariantList parseSubBlocks(const QString &content) const;
@@ -83,7 +82,6 @@ private:
     QList<ChatBlock> m_allBlocks;   // all parsed blocks
     QList<ChatBlock> m_blocks;      // visible window (tail of m_allBlocks)
     int m_visibleStart = 0;         // index into m_allBlocks where visible window starts
-    int m_lastBlockTextOffset = 0;  // char offset in m_rawText where last block starts
     mutable QHash<QString, QString> m_highlightCache;
 };