feat: support cerberas

README.md

@@ -108,7 +108,7 @@ Create an RLLM instance with sensible defaults.
 ```typescript
 const rlm = createRLLM({
   model: 'gpt-4o-mini',      // Model name
-  provider: 'openai',         // 'openai' | 'anthropic' | 'gemini' | 'openrouter' | 'custom'
+  provider: 'openai',         // 'openai' | 'anthropic' | 'gemini' | 'openrouter' | 'cerebras' | 'custom'
   apiKey: process.env.KEY,    // Optional, uses env vars by default
   baseUrl: undefined,         // Optional, required for 'custom' provider
   verbose: true,              // Enable logging
@@ -131,6 +131,23 @@ const rlm = createRLLM({
 
 **Note:** When using `provider: 'custom'`, the `baseUrl` parameter is **required**. An error will be thrown if it's not provided.
 
+### Cerebras Provider
+
+Use Cerebras with the built-in `cerebras` provider:
+
+```typescript
+const rlm = createRLLM({
+  provider: 'cerebras',
+  model: 'gpt-oss-120b',
+  // optional if CEREBRAS_API_KEY is set
+  apiKey: process.env.CEREBRAS_API_KEY,
+});
+```
+
+Defaults:
+- API key env var: `CEREBRAS_API_KEY`
+- Base URL: `https://api.cerebras.ai/v1`
+
 ### `RLLM` Methods
 
 | Method | Description |

examples/node-modules-viz/README.md

@@ -211,6 +211,9 @@ Create a `.env` file:
 ```bash
 OPENAI_API_KEY=your_key_here
 MODEL=gpt-4o-mini  # or gpt-4o, gpt-4-turbo, etc.
+# Optional: switch provider (openai | anthropic | gemini | openrouter | cerebras)
+# PROVIDER=cerebras
+# CEREBRAS_API_KEY=your_key_here
 ```
 
 ## Tips

examples/node-modules-viz/server.mjs

@@ -49,6 +49,7 @@ const apiKeyName = {
   openai: 'OPENAI_API_KEY',
   anthropic: 'ANTHROPIC_API_KEY',
   openrouter: 'OPENROUTER_API_KEY',
+  cerebras: 'CEREBRAS_API_KEY',
 }[provider] || 'API key';
 
 const hasApiKey = provider === 'gemini' 

src/llm-client.test.ts

@@ -11,27 +11,31 @@ import { LLMClient } from "./llm-client.js";
 // Test the provider configuration logic directly
 // (extracted from LLMClient to make it testable)
 
-function getDefaultApiKey(provider: "openai" | "anthropic" | "openrouter" | "custom"): string | undefined {
+function getDefaultApiKey(provider: "openai" | "anthropic" | "openrouter" | "cerebras" | "custom"): string | undefined {
   switch (provider) {
     case "openai":
       return process.env["OPENAI_API_KEY"];
     case "anthropic":
       return process.env["ANTHROPIC_API_KEY"];
     case "openrouter":
       return process.env["OPENROUTER_API_KEY"];
+    case "cerebras":
+      return process.env["CEREBRAS_API_KEY"];
     case "custom":
       return undefined;
   }
 }
 
-function getDefaultBaseUrl(provider: "openai" | "anthropic" | "openrouter" | "custom"): string | undefined {
+function getDefaultBaseUrl(provider: "openai" | "anthropic" | "openrouter" | "cerebras" | "custom"): string | undefined {
   switch (provider) {
     case "openai":
       return undefined; // Uses default
     case "anthropic":
       return "https://api.anthropic.com/v1";
     case "openrouter":
       return "https://openrouter.ai/api/v1";
+    case "cerebras":
+      return "https://api.cerebras.ai/v1";
     case "custom":
       return undefined;
   }
@@ -50,6 +54,10 @@ describe("LLMClient provider configuration", () => {
     it("returns OpenRouter base URL", () => {
       expect(getDefaultBaseUrl("openrouter")).toBe("https://openrouter.ai/api/v1");
     });
+
+    it("returns Cerebras base URL", () => {
+      expect(getDefaultBaseUrl("cerebras")).toBe("https://api.cerebras.ai/v1");
+    });
   });
 
   describe("getDefaultApiKey", () => {
@@ -80,6 +88,15 @@ describe("LLMClient provider configuration", () => {
       process.env["OPENROUTER_API_KEY"] = original;
     });
 
+    it("reads CEREBRAS_API_KEY for cerebras provider", () => {
+      const original = process.env["CEREBRAS_API_KEY"];
+      process.env["CEREBRAS_API_KEY"] = "test-cerebras-key";
+
+      expect(getDefaultApiKey("cerebras")).toBe("test-cerebras-key");
+
+      process.env["CEREBRAS_API_KEY"] = original;
+    });
+
     it("returns undefined for custom provider (must be provided explicitly)", () => {
       expect(getDefaultApiKey("custom")).toBeUndefined();
     });

src/llm-client.ts

@@ -63,6 +63,8 @@ export class LLMClient {
         return process.env["GEMINI_API_KEY"] ?? process.env["GOOGLE_API_KEY"];
       case "openrouter":
         return process.env["OPENROUTER_API_KEY"];
+      case "cerebras":
+        return process.env["CEREBRAS_API_KEY"];
       case "custom":
         return undefined; // Must be provided explicitly
     }
@@ -78,6 +80,8 @@ export class LLMClient {
         return "https://generativelanguage.googleapis.com/v1beta/openai/";
       case "openrouter":
         return "https://openrouter.ai/api/v1";
+      case "cerebras":
+        return "https://api.cerebras.ai/v1";
       case "custom":
         return undefined; // Must be provided explicitly (validated in constructor)
     }

src/rlm.ts

@@ -334,7 +334,7 @@ export class RLLM {
  */
 export function createRLLM(options: {
   model?: string;
-  provider?: "openai" | "anthropic" | "gemini" | "openrouter" | "custom";
+  provider?: "openai" | "anthropic" | "gemini" | "openrouter" | "cerebras" | "custom";
   apiKey?: string;
   baseUrl?: string;
   verbose?: boolean;

src/types.ts

@@ -23,7 +23,7 @@ export type InferContextType<S> = S extends ZodType<infer T> ? T : string;
 // LLM Client Types
 // ============================================================================
 
-export type LLMProvider = "openai" | "anthropic" | "gemini" | "openrouter" | "custom";
+export type LLMProvider = "openai" | "anthropic" | "gemini" | "openrouter" | "cerebras" | "custom";
 
 export interface ChatMessage {
   role: "system" | "user" | "assistant" | "tool";