add cerebras ai and add pixtral

I heard a lot of praise for pixtral over the last few days so i've decided that it needs to be in this. not sure about the coding performance but it won't hurt to have an extra model in the options!

.env.example

@@ -43,5 +43,10 @@ OPENAI_LIKE_API_KEY=
 # You only need this environment variable set if you want to use Mistral models
 MISTRAL_API_KEY=
 
+# Get your Cerebras API Key by following these instructions -
+# https://github.com/Cerebras/inference-examples/blob/main/getting-started/README.md
+# You only need this environment variable set if you want to use Cerebras models
+CEREBRAS_API_KEY=
+
 # Include this environment variable if you want more logging for debugging locally
 VITE_LOG_LEVEL=debug

app/lib/.server/llm/api-key.ts

@@ -25,6 +25,8 @@ export function getAPIKey(cloudflareEnv: Env, provider: string) {
       return env.MISTRAL_API_KEY || cloudflareEnv.MISTRAL_API_KEY;        
     case "OpenAILike":
       return env.OPENAI_LIKE_API_KEY || cloudflareEnv.OPENAI_LIKE_API_KEY;
+    case "Cerebras":
+      return env.CEREBRAS_API_KEY || cloudflareEnv.CEREBRAS_API_KEY;
     default:
       return "";
   }

app/lib/.server/llm/model.ts

@@ -80,6 +80,15 @@ export function getOpenRouterModel(apiKey: string, model: string) {
   return openRouter.chat(model);
 }
 
+export function getCerebrasModel(apiKey: string, model: string) {
+  const openai = createOpenAI({
+    baseURL: 'https://api.cerebras.ai/v1',
+    apiKey,
+  });
+
+  return openai(model);
+}
+
 export function getModel(provider: string, model: string, env: Env) {
   const apiKey = getAPIKey(env, provider);
   const baseURL = getBaseURL(env, provider);
@@ -101,6 +110,8 @@ export function getModel(provider: string, model: string, env: Env) {
       return getDeepseekModel(apiKey, model)
     case 'Mistral':
       return  getMistralModel(apiKey, model);
+    case 'Cerebras':
+      return getCerebrasModel(apiKey, model);
     default:
       return getOllamaModel(baseURL, model);
   }

app/utils/constants.ts

@@ -43,6 +43,9 @@ const staticModels: ModelInfo[] = [
   { name: 'mistral-small-latest', label: 'Mistral Small', provider: 'Mistral' },
   { name: 'codestral-latest', label: 'Codestral', provider: 'Mistral' },
   { name: 'mistral-large-latest', label: 'Mistral Large Latest', provider: 'Mistral' },
+  { name: 'pixtral-12b-2409', label: 'Pixtral 12B', provider: 'Mistral' },
+  { name: 'llama3.1-8b', label: 'Llama 3.1 8B', provider: 'Cerebras' },
+  { name: 'llama3.1-70b', label: 'Llama 3.1 70B', provider: 'Cerebras' },
 ];
 
 export let MODEL_LIST: ModelInfo[] = [...staticModels];