diff --git a/examples/speculative/speculative.cpp b/examples/speculative/speculative.cpp
index 4d987332a..ff5eceb64 100644
--- a/examples/speculative/speculative.cpp
+++ b/examples/speculative/speculative.cpp
@@ -45,7 +45,6 @@ int main(int argc, char ** argv) {
     }
 
     common_init();
-#if 0
     if (params.speculative.model.empty()) {
         LOG_ERR("%s: --model-draft is required\n", __func__);
         return 1;
@@ -169,9 +168,9 @@ int main(int argc, char ** argv) {
     llama_batch_ext_ptr batch0(llama_batch_ext_init_from_text( inp.data(), n_input - 1, 0,           0, true));
     llama_batch_ext_ptr batch1(llama_batch_ext_init_from_text(&inp.back(),           1, n_input - 1, 0, true));
     llama_batch_ext_ptr batch2(llama_batch_ext_init_from_text( inp.data(), n_input    , 0,           0, true));
-    llama_decode_ext(ctx_tgt, batch0);
-    llama_decode_ext(ctx_tgt, batch1);
-    llama_decode_ext(ctx_dft, batch2);
+    llama_decode_ext(ctx_tgt, batch0.get());
+    llama_decode_ext(ctx_tgt, batch1.get());
+    llama_decode_ext(ctx_dft, batch2.get());
 
     const auto t_enc_end = ggml_time_us();
 
@@ -338,7 +337,7 @@ int main(int argc, char ** argv) {
                             if (i == s) {
                                 continue;
                             }
-                            if (drafts[i].tokens[i_dft] == drafts[s].tokens[i_dft]) {
+                            if (drafts[i].active && drafts[i].tokens[i_dft] == drafts[s].tokens[i_dft]) {
                                 // synchronize active status for sequences with the same drafted token
                                 drafts[i].active = drafts[i].active && accept;
                                 if (!drafts[i].active) {
@@ -446,7 +445,7 @@ int main(int argc, char ** argv) {
 
             llama_batch_ext_clear(batch_dft);
             llama_seq_id seq_id = 0;
-            llama_batch_ext_add_text(batch_tgt, token_id, n_past_tgt, &seq_id, 1, true);
+            llama_batch_ext_add_text(batch_dft, token_id, n_past_dft, &seq_id, 1, true);
 
             llama_kv_self_seq_rm(ctx_dft, 0, n_past_dft, -1);
             // LOG_DBG("dft batch: %s\n", LOG_BATCH_TOSTR_PRETTY(ctx_dft, batch_dft).c_str());
@@ -475,13 +474,19 @@ int main(int argc, char ** argv) {
         drafts[0].drafting    = true;
         drafts[0].i_batch_dft = 0;
 
-        llama_batch_ext_clear(batch_tgt);
-        llama_seq_id seq_id = 0;
-        llama_batch_ext_add_text(batch_tgt, drafts[0].tokens[0], n_past_tgt, &seq_id, 1, true);
+        struct batch_info {
+            llama_token id;
+            llama_pos pos;
+            std::vector<llama_seq_id> seq_id;
+        };
+
+        std::vector<batch_info> batch_tgt_data;
+
+        batch_tgt_data.push_back({ drafts[0].tokens[0], n_past_tgt, {0} });
 
         // sample n_draft tokens from the draft model using tree-based sampling
         for (int i = 0; i < n_draft; ++i) {
-            batch_dft.n_tokens = 0;
+            llama_batch_ext_clear(batch_dft);
 
             for (int s = 0; s < n_seq_dft; ++s) {
                 drafts[s].skip = false;
@@ -512,11 +517,10 @@ int main(int argc, char ** argv) {
                         llama_kv_self_seq_cp(ctx_dft, s, n_seq_cur, -1, -1);
 
                         // all previous tokens from this branch are now also part of the new branch
-                        for (int t = 0; t < batch_tgt.n_tokens; ++t) {
-                            for (int p = 0; p < batch_tgt.n_seq_id[t]; ++p) {
-                                if (batch_tgt.seq_id[t][p] == s) {
-                                    batch_tgt.seq_id[t][batch_tgt.n_seq_id[t]] = n_seq_cur;
-                                    batch_tgt.n_seq_id[t]++;
+                        for (int t = 0; t < (int) batch_tgt_data.size(); ++t) {
+                            for (int p = 0; p < (int) batch_tgt_data[t].seq_id.size(); ++p) {
+                                if (batch_tgt_data[t].seq_id[p] == s) {
+                                    batch_tgt_data[t].seq_id.push_back(n_seq_cur);
                                     break;
                                 }
                             }
@@ -558,32 +562,30 @@ int main(int argc, char ** argv) {
                     drafts[s].dists.push_back({cur_p->data, cur_p->data + cur_p->size});
 
                     // add unique drafted tokens to the target batch
-                    drafts[s].i_batch_tgt.push_back(batch_tgt.n_tokens);
+                    drafts[s].i_batch_tgt.push_back(batch_tgt_data.size());
 
-                    common_batch_add(batch_tgt, id, n_past_tgt + i + 1, { s }, true);
+                    batch_tgt_data.push_back({ id, n_past_tgt + i + 1, { s }});
 
                     // add the token to the batch for batched decoding with the draft model
-                    drafts[s].i_batch_dft = batch_dft.n_tokens;
+                    drafts[s].i_batch_dft = llama_batch_ext_add_text(batch_dft, id, n_past_cur, &s, 1, true);
 
-                    common_batch_add(batch_dft, id, n_past_cur, { s }, true);
-
-                    if (batch_tgt.n_tokens > n_draft) {
+                    if (batch_tgt_data.size() > (size_t) n_draft) {
                         drafts[s].drafting = false;
                     }
                 }
             }
 
             // no sequence is drafting anymore
-            if (batch_dft.n_tokens == 0) {
+            if (llama_batch_ext_get_n_tokens(batch_dft) == 0) {
                 break;
             }
 
             // evaluate the drafted tokens on the draft model
-            llama_decode(ctx_dft, batch_dft);
+            llama_decode_ext(ctx_dft, batch_dft);
             ++n_past_cur;
             ++n_drafted;
 
-            if (batch_tgt.n_tokens > n_draft) {
+            if (batch_tgt_data.size() > (size_t) n_draft) {
                 break;
             }
         }
@@ -595,8 +597,15 @@ int main(int argc, char ** argv) {
                 llama_kv_self_seq_cp(ctx_tgt, 0, s, -1, -1);
             }
 
+            llama_batch_ext_clear(batch_tgt);
+            for (int i = 0; i < (int) batch_tgt_data.size(); ++i) {
+                const auto & data = batch_tgt_data[i];
+
+                llama_batch_ext_add_text(batch_tgt, data.id, data.pos, data.seq_id.data(), data.seq_id.size(), true);
+            }
+
             // LOG_DBG("target batch: %s\n", LOG_BATCH_TOSTR_PRETTY(ctx_tgt, batch_tgt).c_str());
-            llama_decode(ctx_tgt, batch_tgt);
+            llama_decode_ext(ctx_tgt, batch_tgt);
             ++n_past_tgt;
         }
 
@@ -639,12 +648,12 @@ int main(int argc, char ** argv) {
         common_sampler_free(drafts[s].smpl);
     }
 
-    llama_batch_free(batch_dft);
+    llama_batch_ext_free(batch_dft);
+    llama_batch_ext_free(batch_tgt);
 
     llama_backend_free();
 
     LOG("\n\n");
 
-#endif
     return 0;
 }