diff --git a/crates/hermesllm/src/providers/common_types.rs b/crates/hermesllm/src/providers/common_types.rs
new file mode 100644
index 00000000..bb222909
--- /dev/null
+++ b/crates/hermesllm/src/providers/common_types.rs
@@ -0,0 +1,44 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Message {
+    pub role: String,
+    pub content: String,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ChatRequestBase {
+    pub model: String,
+    pub messages: Option<Vec<Message>>,
+    pub temperature: Option<f32>,
+    pub top_p: Option<f32>,
+    pub n: Option<u32>,
+    pub max_tokens: Option<u32>,
+    pub stream: Option<bool>,
+    pub stop: Option<Vec<String>>,
+    pub presence_penalty: Option<f32>,
+    pub frequency_penalty: Option<f32>,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct ChatResponseBase {
+    pub id: String,
+    pub object: String,
+    pub created: u64,
+    pub choices: Vec<Choice>,
+    pub usage: Option<Usage>,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct Choice {
+    pub index: u32,
+    pub message: Message,
+    pub finish_reason: Option<String>,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct Usage {
+    pub prompt_tokens: u32,
+    pub completion_tokens: u32,
+    pub total_tokens: u32,
+}
diff --git a/crates/hermesllm/src/providers/deepseek/mod.rs b/crates/hermesllm/src/providers/deepseek/mod.rs
new file mode 100644
index 00000000..31e4045a
--- /dev/null
+++ b/crates/hermesllm/src/providers/deepseek/mod.rs
@@ -0,0 +1,27 @@
+pub mod types;
+
+use thiserror::Error;
+
+use crate::providers::deepseek::types::{DeepSeekRequest, DeepSeekResponse};
+
+#[derive(Debug, Error)]
+pub enum DeepSeekError {
+    #[error("json error: {0}")]
+    JsonParseError(#[from] serde_json::Error),
+}
+
+type Result<T> = std::result::Result<T, DeepSeekError>;
+
+impl TryFrom<&[u8]> for DeepSeekRequest {
+    type Error = DeepSeekError;
+    fn try_from(bytes: &[u8]) -> Result<Self> {
+        serde_json::from_slice(bytes).map_err(DeepSeekError::from)
+    }
+}
+
+impl TryFrom<&[u8]> for DeepSeekResponse {
+    type Error = DeepSeekError;
+    fn try_from(bytes: &[u8]) -> Result<Self> {
+        serde_json::from_slice(bytes).map_err(DeepSeekError::from)
+    }
+}
diff --git a/crates/hermesllm/src/providers/deepseek/types.rs b/crates/hermesllm/src/providers/deepseek/types.rs
new file mode 100644
index 00000000..62b17388
--- /dev/null
+++ b/crates/hermesllm/src/providers/deepseek/types.rs
@@ -0,0 +1,17 @@
+use serde::{Deserialize, Serialize};
+use crate::providers::common_types::{ChatRequestBase, ChatResponseBase};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DeepSeekRequest {
+    #[serde(flatten)]
+    pub base: ChatRequestBase,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DeepSeekResponse {
+    #[serde(flatten)]
+    pub base: ChatResponseBase,
+}
+
+// Re-export for convenience
+pub use crate::providers::common_types::{Message, Choice, Usage};
diff --git a/crates/hermesllm/src/providers/groq/types.rs b/crates/hermesllm/src/providers/groq/types.rs
new file mode 100644
index 00000000..6f88231a
--- /dev/null
+++ b/crates/hermesllm/src/providers/groq/types.rs
@@ -0,0 +1,16 @@
+use serde::{Deserialize, Serialize};
+use crate::providers::common_types::{ChatRequestBase, ChatResponseBase};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct GroqRequest {
+    #[serde(flatten)]
+    pub base: ChatRequestBase,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct GroqResponse {
+    #[serde(flatten)]
+    pub base: ChatResponseBase,
+}
+
+pub use crate::providers::common_types::{Message, Choice, Usage};