diff --git a/src/llama-arch.cpp b/src/llama-arch.cpp
index 72968607d..8a1927243 100644
--- a/src/llama-arch.cpp
+++ b/src/llama-arch.cpp
@@ -141,6 +141,7 @@ static const std::map<llm_arch, const char *> LLM_ARCH_NAMES = {
     { LLM_ARCH_KIMI_LINEAR,      "kimi-linear"      },
     { LLM_ARCH_TALKIE,           "talkie"           },
     { LLM_ARCH_MELLUM,           "mellum"           },
+    { LLM_ARCH_COSMOS,           "cosmos"           },
     { LLM_ARCH_UNKNOWN,          "(unknown)"        },
 };
 
@@ -397,6 +398,7 @@ static const std::map<llm_tensor, const char *> LLM_TENSOR_NAMES = {
     { LLM_TENSOR_ATTN_Q_NORM,                            "blk.%d.attn_q_norm" },
     { LLM_TENSOR_ATTN_K_NORM,                            "blk.%d.attn_k_norm" },
     { LLM_TENSOR_ATTN_GATE,                              "blk.%d.attn_gate" },
+    { LLM_TENSOR_ATTN_54,                                "blk.%d.attn_54" },
     { LLM_TENSOR_FFN_POST_NORM,                          "blk.%d.post_ffw_norm" },
     { LLM_TENSOR_FFN_POST_NORM_1,                        "blk.%d.post_ffw_norm_1" },
     { LLM_TENSOR_FFN_POST_NORM_2,                        "blk.%d.post_ffw_norm_2" },
@@ -640,6 +642,7 @@ static const std::map<llm_tensor, llm_tensor_info> LLM_TENSOR_INFOS = {
     {LLM_TENSOR_ATTN_QKV,                   {LLM_TENSOR_LAYER_REPEATING, GGML_OP_MUL_MAT}},
     {LLM_TENSOR_ATTN_OUT,                   {LLM_TENSOR_LAYER_REPEATING, GGML_OP_MUL_MAT}},
     {LLM_TENSOR_ATTN_GATE,                  {LLM_TENSOR_LAYER_REPEATING, GGML_OP_MUL_MAT}},
+    {LLM_TENSOR_ATTN_54,                    {LLM_TENSOR_LAYER_REPEATING, GGML_OP_MUL_MAT}},
     {LLM_TENSOR_FFN_GATE,                   {LLM_TENSOR_LAYER_REPEATING, GGML_OP_MUL_MAT}},
     {LLM_TENSOR_FFN_DOWN,                   {LLM_TENSOR_LAYER_REPEATING, GGML_OP_MUL_MAT}},
     {LLM_TENSOR_FFN_UP,                     {LLM_TENSOR_LAYER_REPEATING, GGML_OP_MUL_MAT}},
diff --git a/src/llama-arch.h b/src/llama-arch.h
index b74d53af4..036f4e30f 100644
--- a/src/llama-arch.h
+++ b/src/llama-arch.h
@@ -146,6 +146,7 @@ enum llm_arch {
     LLM_ARCH_MELLUM,
     LLM_ARCH_EAGLE3,
     LLM_ARCH_DFLASH,
+    LLM_ARCH_COSMOS,
     LLM_ARCH_UNKNOWN,
 };
 
@@ -400,6 +401,7 @@ enum llm_tensor {
     LLM_TENSOR_ATTN_ROT_EMBD,
     LLM_TENSOR_ATTN_SINKS,
     LLM_TENSOR_ATTN_GATE,
+    LLM_TENSOR_ATTN_54,
     LLM_TENSOR_FFN_GATE_INP,
     LLM_TENSOR_FFN_GATE_INP_SHEXP,
     LLM_TENSOR_FFN_NORM,
diff --git a/src/llama-model.cpp b/src/llama-model.cpp
index 4c10e4126..1cb328fa4 100644
--- a/src/llama-model.cpp
+++ b/src/llama-model.cpp
@@ -298,6 +298,8 @@ static llama_model * llama_model_mapping(llm_arch arch, const llama_model_params
             return new llama_model_eagle3(params);
         case LLM_ARCH_DFLASH:
             return new llama_model_dflash(params);
+        case LLM_ARCH_COSMOS:
+            return new llama_model_cosmos(params);
         case LLM_ARCH_MIMO2:
             return new llama_model_mimo2(params);
         case LLM_ARCH_KIMI_LINEAR:
@@ -2444,6 +2446,7 @@ llama_rope_type llama_model_rope_type(const llama_model * model) {
         case LLM_ARCH_NEMOTRON_H:
         case LLM_ARCH_NEMOTRON_H_MOE:
         case LLM_ARCH_KIMI_LINEAR:
+        case LLM_ARCH_COSMOS:
             return LLAMA_ROPE_TYPE_NONE;
 
         // use what we call a normal RoPE, operating on pairs of consecutive head values
diff --git a/src/llama-model.h b/src/llama-model.h
index 45b054ced..a5c54f058 100644
--- a/src/llama-model.h
+++ b/src/llama-model.h
@@ -466,6 +466,10 @@ struct llama_layer {
     // openai-moe
     struct ggml_tensor * attn_sinks = nullptr;
 
+    // cosmos: 54D mixture-of-states Hebbian attention
+    struct ggml_tensor * attn_54   = nullptr;
+    struct ggml_tensor * attn_gate = nullptr;
+
     // DeepSeek-V4
     struct ggml_tensor * attn_kv_norm = nullptr;
     struct ggml_tensor * hc_attn_fn   = nullptr;
diff --git a/src/models/models.h b/src/models/models.h
index a86ae05aa..91c7a512d 100644
--- a/src/models/models.h
+++ b/src/models/models.h
@@ -437,6 +437,18 @@ struct llama_model_qwen : public llama_model_base {
 };
 
 
+struct llama_model_cosmos : public llama_model_base {
+    llama_model_cosmos(const struct llama_model_params & params) : llama_model_base(params) {}
+    void load_arch_hparams(llama_model_loader & ml) override;
+    void load_arch_tensors(llama_model_loader & ml) override;
+
+    struct graph : public llm_graph_context {
+        graph(const llama_model & model, const llm_graph_params & params);
+    };
+
+    std::unique_ptr<llm_graph_context> build_arch_graph(const llm_graph_params & params) const override;
+};
+
 struct llama_model_qwen2 : public llama_model_base {
     llama_model_qwen2(const struct llama_model_params & params) : llama_model_base(params) {}
     void load_arch_hparams(llama_model_loader & ml) override;