diff --git a/docs/docs.go b/docs/docs.go
index 51a45f21..67918956 100644
--- a/docs/docs.go
+++ b/docs/docs.go
@@ -203,7 +203,11 @@ const docTemplate = `{
                 },
                 "role": {
                     "description": "The role of the author of this message. One of system, user, or assistant.",
-                    "type": "string"
+                    "allOf": [
+                        {
+                            "$ref": "#/definitions/schemas.Role"
+                        }
+                    ]
                 }
             }
         },
@@ -308,6 +312,19 @@ const docTemplate = `{
                 }
             }
         },
+        "schemas.Role": {
+            "type": "string",
+            "enum": [
+                "system",
+                "user",
+                "assistant"
+            ],
+            "x-enum-varnames": [
+                "RoleSystem",
+                "RoleUser",
+                "RoleAssistant"
+            ]
+        },
         "schemas.RouterListSchema": {
             "type": "object",
             "properties": {
diff --git a/docs/swagger.json b/docs/swagger.json
index aa0d3b25..1912039e 100644
--- a/docs/swagger.json
+++ b/docs/swagger.json
@@ -200,7 +200,11 @@
                 },
                 "role": {
                     "description": "The role of the author of this message. One of system, user, or assistant.",
-                    "type": "string"
+                    "allOf": [
+                        {
+                            "$ref": "#/definitions/schemas.Role"
+                        }
+                    ]
                 }
             }
         },
@@ -305,6 +309,19 @@
                 }
             }
         },
+        "schemas.Role": {
+            "type": "string",
+            "enum": [
+                "system",
+                "user",
+                "assistant"
+            ],
+            "x-enum-varnames": [
+                "RoleSystem",
+                "RoleUser",
+                "RoleAssistant"
+            ]
+        },
         "schemas.RouterListSchema": {
             "type": "object",
             "properties": {
diff --git a/docs/swagger.yaml b/docs/swagger.yaml
index 82dcc4a6..4a683f2c 100644
--- a/docs/swagger.yaml
+++ b/docs/swagger.yaml
@@ -6,9 +6,10 @@ definitions:
         description: The content of the message.
         type: string
       role:
+        allOf:
+        - $ref: '#/definitions/schemas.Role'
         description: The role of the author of this message. One of system, user,
           or assistant.
-        type: string
     required:
     - content
     - role
@@ -77,6 +78,16 @@ definitions:
       token_usage:
         $ref: '#/definitions/schemas.TokenUsage'
     type: object
+  schemas.Role:
+    enum:
+    - system
+    - user
+    - assistant
+    type: string
+    x-enum-varnames:
+    - RoleSystem
+    - RoleUser
+    - RoleAssistant
   schemas.RouterListSchema:
     properties:
       routers:
diff --git a/pkg/api/schemas/chat.go b/pkg/api/schemas/chat.go
index bb846043..2ca0af06 100644
--- a/pkg/api/schemas/chat.go
+++ b/pkg/api/schemas/chat.go
@@ -62,7 +62,7 @@ func (r *ChatRequest) Params(modelID string, modelName string) *ChatParams {
 func NewChatFromStr(message string) *ChatRequest {
 	return &ChatRequest{
 		Message: ChatMessage{
-			"user",
+			RoleUser,
 			message,
 		},
 	}
@@ -93,10 +93,18 @@ type TokenUsage struct {
 	TotalTokens    int `json:"total_tokens"`
 }
 
+type Role string
+
+const (
+	RoleSystem    Role = "system"
+	RoleUser      Role = "user"
+	RoleAssistant Role = "assistant"
+)
+
 // ChatMessage is a message in a chat request.
 type ChatMessage struct {
 	// The role of the author of this message. One of system, user, or assistant.
-	Role string `json:"role" validate:"required"`
+	Role Role `json:"role" validate:"required"`
 	// The content of the message.
 	Content string `json:"content" validate:"required"`
 }
diff --git a/pkg/api/schemas/chat_stream.go b/pkg/api/schemas/chat_stream.go
index f7cf8b27..bdcf8fcd 100644
--- a/pkg/api/schemas/chat_stream.go
+++ b/pkg/api/schemas/chat_stream.go
@@ -30,7 +30,7 @@ func NewChatStreamFromStr(message string) *ChatStreamRequest {
 	return &ChatStreamRequest{
 		ChatRequest: &ChatRequest{
 			Message: ChatMessage{
-				"user",
+				RoleUser,
 				message,
 			},
 		},
diff --git a/pkg/api/schemas/chat_test.go b/pkg/api/schemas/chat_test.go
index 9b5ce407..f4cfe9fa 100644
--- a/pkg/api/schemas/chat_test.go
+++ b/pkg/api/schemas/chat_test.go
@@ -30,7 +30,7 @@ func TestChatRequest_DefaultParams(t *testing.T) {
 
 	chatReq := ChatRequest{
 		Message: ChatMessage{
-			Role:    "user",
+			Role:    RoleUser,
 			Content: defaultMessage,
 		},
 		MessageHistory: []ChatMessage{
@@ -42,7 +42,7 @@ func TestChatRequest_DefaultParams(t *testing.T) {
 		OverrideParams: &map[string]ModelParamsOverride{
 			modelID: {
 				Message: ChatMessage{
-					Role:    "user",
+					Role:    RoleUser,
 					Content: myModelMessage,
 				},
 			},
@@ -66,7 +66,7 @@ func TestChatRequest_ModelIDOverride(t *testing.T) {
 
 	chatReq := ChatRequest{
 		Message: ChatMessage{
-			Role:    "user",
+			Role:    RoleUser,
 			Content: defaultMessage,
 		},
 		MessageHistory: []ChatMessage{
@@ -78,7 +78,7 @@ func TestChatRequest_ModelIDOverride(t *testing.T) {
 		OverrideParams: &map[string]ModelParamsOverride{
 			modelID: {
 				Message: ChatMessage{
-					Role:    "user",
+					Role:    RoleUser,
 					Content: myModelMessage,
 				},
 			},
@@ -102,7 +102,7 @@ func TestChatRequest_ModelNameOverride(t *testing.T) {
 
 	chatReq := ChatRequest{
 		Message: ChatMessage{
-			Role:    "user",
+			Role:    RoleUser,
 			Content: defaultMessage,
 		},
 		MessageHistory: []ChatMessage{
@@ -114,7 +114,7 @@ func TestChatRequest_ModelNameOverride(t *testing.T) {
 		OverrideParams: &map[string]ModelParamsOverride{
 			modelName: {
 				Message: ChatMessage{
-					Role:    "user",
+					Role:    RoleUser,
 					Content: myModelMessage,
 				},
 			},
@@ -139,7 +139,7 @@ func TestChatRequest_ModelNameIDOverride(t *testing.T) {
 
 	chatReq := ChatRequest{
 		Message: ChatMessage{
-			Role:    "user",
+			Role:    RoleUser,
 			Content: defaultMessage,
 		},
 		MessageHistory: []ChatMessage{
@@ -151,13 +151,13 @@ func TestChatRequest_ModelNameIDOverride(t *testing.T) {
 		OverrideParams: &map[string]ModelParamsOverride{
 			modelName: {
 				Message: ChatMessage{
-					Role:    "user",
+					Role:    RoleUser,
 					Content: myModelNameMessage,
 				},
 			},
 			modelID: {
 				Message: ChatMessage{
-					Role:    "user",
+					Role:    RoleUser,
 					Content: myModelIDMessage,
 				},
 			},
diff --git a/pkg/providers/anthropic/chat.go b/pkg/providers/anthropic/chat.go
index 80b45f2b..f0e14fb2 100644
--- a/pkg/providers/anthropic/chat.go
+++ b/pkg/providers/anthropic/chat.go
@@ -139,7 +139,7 @@ func (c *Client) doChatRequest(ctx context.Context, payload *ChatRequest) (*sche
 		ModelResponse: schemas.ModelResponse{
 			Metadata: map[string]string{},
 			Message: schemas.ChatMessage{
-				Role:    completion.Type,
+				Role:    schemas.Role(completion.Type),
 				Content: completion.Text,
 			},
 			TokenUsage: schemas.TokenUsage{
diff --git a/pkg/providers/azureopenai/chat_stream_test.go b/pkg/providers/azureopenai/chat_stream_test.go
index 5aade1f5..efb70a0c 100644
--- a/pkg/providers/azureopenai/chat_stream_test.go
+++ b/pkg/providers/azureopenai/chat_stream_test.go
@@ -72,7 +72,7 @@ func TestAzureOpenAIClient_ChatStreamRequest(t *testing.T) {
 			require.NoError(t, err)
 
 			chatParams := schemas.ChatParams{Messages: []schemas.ChatMessage{{
-				Role:    "user",
+				Role:    schemas.RoleUser,
 				Content: "What's the capital of the United Kingdom?",
 			}}}
 
@@ -140,7 +140,7 @@ func TestAzureOpenAIClient_ChatStreamRequestInterrupted(t *testing.T) {
 			require.NoError(t, err)
 
 			chatParams := schemas.ChatParams{Messages: []schemas.ChatMessage{{
-				Role:    "user",
+				Role:    schemas.RoleUser,
 				Content: "What's the biggest animal?",
 			}}}
 
diff --git a/pkg/providers/azureopenai/client_test.go b/pkg/providers/azureopenai/client_test.go
index 1700bca0..3529413c 100644
--- a/pkg/providers/azureopenai/client_test.go
+++ b/pkg/providers/azureopenai/client_test.go
@@ -56,7 +56,7 @@ func TestAzureOpenAIClient_ChatRequest(t *testing.T) {
 	require.NoError(t, err)
 
 	chatParams := schemas.ChatParams{Messages: []schemas.ChatMessage{{
-		Role:    "user",
+		Role:    schemas.RoleUser,
 		Content: "What's the capital of the United Kingdom?",
 	}}}
 
@@ -116,7 +116,7 @@ func TestDoChatRequest_ErrorResponse(t *testing.T) {
 	require.NoError(t, err)
 
 	chatParams := schemas.ChatParams{Messages: []schemas.ChatMessage{{
-		Role:    "user",
+		Role:    schemas.RoleUser,
 		Content: "What's the dealio?",
 	}}}
 
diff --git a/pkg/providers/bedrock/chat.go b/pkg/providers/bedrock/chat.go
index 658c1769..dda0637e 100644
--- a/pkg/providers/bedrock/chat.go
+++ b/pkg/providers/bedrock/chat.go
@@ -104,7 +104,7 @@ func (c *Client) doChatRequest(ctx context.Context, payload *ChatRequest) (*sche
 		Cached:    false,
 		ModelResponse: schemas.ModelResponse{
 			Message: schemas.ChatMessage{
-				Role:    "assistant",
+				Role:    schemas.RoleAssistant,
 				Content: modelResult.OutputText,
 			},
 			TokenUsage: schemas.TokenUsage{
diff --git a/pkg/providers/bedrock/client_test.go b/pkg/providers/bedrock/client_test.go
index cdae1f68..57056150 100644
--- a/pkg/providers/bedrock/client_test.go
+++ b/pkg/providers/bedrock/client_test.go
@@ -62,7 +62,7 @@ func TestBedrockClient_ChatRequest(t *testing.T) {
 	require.NoError(t, err)
 
 	chatParams := schemas.ChatParams{Messages: []schemas.ChatMessage{{
-		Role:    "user",
+		Role:    schemas.RoleUser,
 		Content: "What's the biggest animal?",
 	}}}
 
diff --git a/pkg/providers/bedrock/testdata/chat.req.json b/pkg/providers/bedrock/testdata/chat.req.json
index c2e941d2..9466eda7 100644
--- a/pkg/providers/bedrock/testdata/chat.req.json
+++ b/pkg/providers/bedrock/testdata/chat.req.json
@@ -2,7 +2,7 @@
   "model": "amazon.titan-text-express-v1",
   "messages": [
     {
-      "role": "user",
+      "role": schemas.RoleUser,
       "content": "What's the biggest animal?"
     }
   ],
diff --git a/pkg/providers/cohere/chat.go b/pkg/providers/cohere/chat.go
index ddf75680..969d7da9 100644
--- a/pkg/providers/cohere/chat.go
+++ b/pkg/providers/cohere/chat.go
@@ -127,7 +127,7 @@ func (c *Client) doChatRequest(ctx context.Context, payload *ChatRequest) (*sche
 				"responseId":   cohereCompletion.ResponseID,
 			},
 			Message: schemas.ChatMessage{
-				Role:    "assistant",
+				Role:    payload.Role,
 				Content: cohereCompletion.Text,
 			},
 			TokenUsage: schemas.TokenUsage{
diff --git a/pkg/providers/cohere/schemas.go b/pkg/providers/cohere/schemas.go
index 9dc9bb09..2c31ce13 100644
--- a/pkg/providers/cohere/schemas.go
+++ b/pkg/providers/cohere/schemas.go
@@ -2,7 +2,7 @@ package cohere
 
 import "github.com/EinStack/glide/pkg/api/schemas"
 
-// Cohere Chat Response
+// ChatCompletion Cohere Chat Response
 type ChatCompletion struct {
 	Text          string                 `json:"text"`
 	GenerationID  string                 `json:"generation_id"`
@@ -92,6 +92,7 @@ type FinalResponse struct {
 type ChatRequest struct {
 	Model             string                `json:"model"`
 	Message           string                `json:"message"`
+	Role              schemas.Role          `json:"role"`
 	ChatHistory       []schemas.ChatMessage `json:"chat_history"`
 	Temperature       float64               `json:"temperature,omitempty"`
 	Preamble          string                `json:"preamble,omitempty"`
@@ -112,8 +113,26 @@ func (r *ChatRequest) ApplyParams(params *schemas.ChatParams) {
 	message := params.Messages[len(params.Messages)-1]
 	messageHistory := params.Messages[:len(params.Messages)-1]
 
-	// TODO: Map chat message roles to Cohere roles: CHATBOT, SYSTEM, USER
-
+	mapRole := func(role schemas.Role) string {
+		switch role {
+		case schemas.RoleSystem:
+			return "SYSTEM"
+		case schemas.RoleUser:
+			return "USER"
+		case schemas.RoleAssistant:
+			return "CHATBOT"
+		default:
+			return "USER"
+		}
+	}
+
+	for i := range messageHistory {
+		messageHistory[i].Role = schemas.Role(mapRole(messageHistory[i].Role))
+	}
+
+	message.Role = schemas.Role(mapRole(message.Role))
+
+	r.Role = message.Role
 	r.Message = message.Content
 	r.ChatHistory = messageHistory
 }
diff --git a/pkg/providers/octoml/client_test.go b/pkg/providers/octoml/client_test.go
index f35de1f7..353dbe9d 100644
--- a/pkg/providers/octoml/client_test.go
+++ b/pkg/providers/octoml/client_test.go
@@ -121,7 +121,7 @@ func TestDoChatRequest_ErrorResponse(t *testing.T) {
 
 	// Create a chat request payload
 	chatParams := schemas.ChatParams{Messages: []schemas.ChatMessage{{
-		Role:    "user",
+		Role:    schemas.RoleUser,
 		Content: "What's the dealeo?",
 	}}}
 
diff --git a/pkg/providers/ollama/chat.go b/pkg/providers/ollama/chat.go
index b93f5b10..40356d7b 100644
--- a/pkg/providers/ollama/chat.go
+++ b/pkg/providers/ollama/chat.go
@@ -172,7 +172,7 @@ func (c *Client) doChatRequest(ctx context.Context, payload *ChatRequest) (*sche
 		Cached:    false,
 		ModelResponse: schemas.ModelResponse{
 			Message: schemas.ChatMessage{
-				Role:    ollamaCompletion.Message.Role,
+				Role:    schemas.Role(ollamaCompletion.Message.Role),
 				Content: ollamaCompletion.Message.Content,
 			},
 			TokenUsage: schemas.TokenUsage{
diff --git a/pkg/providers/ollama/client_test.go b/pkg/providers/ollama/client_test.go
index e6c584cf..e7af71d9 100644
--- a/pkg/providers/ollama/client_test.go
+++ b/pkg/providers/ollama/client_test.go
@@ -57,7 +57,7 @@ func TestOllamaClient_ChatRequest(t *testing.T) {
 	require.NoError(t, err)
 
 	chatParams := schemas.ChatParams{Messages: []schemas.ChatMessage{{
-		Role:    "user",
+		Role:    schemas.RoleUser,
 		Content: "What's the biggest animal?",
 	}}}
 
@@ -85,7 +85,7 @@ func TestOllamaClient_ChatRequest_Non200Response(t *testing.T) {
 	require.NoError(t, err)
 
 	chatParams := schemas.ChatParams{Messages: []schemas.ChatMessage{{
-		Role:    "user",
+		Role:    schemas.RoleUser,
 		Content: "What's the capital of the United Kingdom?",
 	}}}
 
@@ -122,7 +122,7 @@ func TestOllamaClient_ChatRequest_SuccessfulResponse(t *testing.T) {
 	require.NoError(t, err)
 
 	chatParams := schemas.ChatParams{Messages: []schemas.ChatMessage{{
-		Role:    "user",
+		Role:    schemas.RoleUser,
 		Content: "What's the capital of the United Kingdom?",
 	}}}
 
@@ -130,6 +130,6 @@ func TestOllamaClient_ChatRequest_SuccessfulResponse(t *testing.T) {
 
 	require.NoError(t, err)
 	require.NotNil(t, response)
-	require.Equal(t, "assistant", response.ModelResponse.Message.Role)
+	require.Equal(t, schemas.RoleAssistant, response.ModelResponse.Message.Role)
 	require.Equal(t, "London", response.ModelResponse.Message.Content)
 }
diff --git a/pkg/providers/openai/chat_stream.go b/pkg/providers/openai/chat_stream.go
index 08ca2b21..659d8b8d 100644
--- a/pkg/providers/openai/chat_stream.go
+++ b/pkg/providers/openai/chat_stream.go
@@ -120,7 +120,7 @@ func (s *ChatStream) Recv() (*schemas.ChatStreamChunk, error) {
 					"generated_at":       completionChunk.Created,
 				},
 				Message: schemas.ChatMessage{
-					Role:    "assistant", // doesn't present in all chunks
+					Role:    schemas.RoleAssistant, // doesn't present in all chunks
 					Content: responseChunk.Delta.Content,
 				},
 			},
diff --git a/pkg/providers/openai/chat_stream_test.go b/pkg/providers/openai/chat_stream_test.go
index 1ab8483b..236b9d6f 100644
--- a/pkg/providers/openai/chat_stream_test.go
+++ b/pkg/providers/openai/chat_stream_test.go
@@ -72,7 +72,7 @@ func TestOpenAIClient_ChatStreamRequest(t *testing.T) {
 			require.NoError(t, err)
 
 			chatParams := schemas.ChatParams{Messages: []schemas.ChatMessage{{
-				Role:    "user",
+				Role:    schemas.RoleUser,
 				Content: "What's the capital of the United Kingdom?",
 			}}}
 
@@ -140,7 +140,7 @@ func TestOpenAIClient_ChatStreamRequestInterrupted(t *testing.T) {
 			require.NoError(t, err)
 
 			chatParams := schemas.ChatParams{Messages: []schemas.ChatMessage{{
-				Role:    "user",
+				Role:    schemas.RoleUser,
 				Content: "What's the capital of the United Kingdom?",
 			}}}
 
diff --git a/pkg/providers/openai/chat_test.go b/pkg/providers/openai/chat_test.go
index 3109f150..209507ad 100644
--- a/pkg/providers/openai/chat_test.go
+++ b/pkg/providers/openai/chat_test.go
@@ -57,7 +57,7 @@ func TestOpenAIClient_ChatRequest(t *testing.T) {
 	require.NoError(t, err)
 
 	chatParams := schemas.ChatParams{Messages: []schemas.ChatMessage{{
-		Role:    "user",
+		Role:    schemas.RoleUser,
 		Content: "What's the capital of the United Kingdom?",
 	}}}