diff --git a/.env.example b/.env.example
index 77ca0f3a3..e8aa71633 100644
--- a/.env.example
+++ b/.env.example
@@ -41,7 +41,8 @@
 # OPENROUTER_MODEL=anthropic/claude-sonnet-4-20250514
 
 # MINIMAX_API_KEY=...
-# MINIMAX_MODEL=MiniMax-M2.7
+# MINIMAX_MODEL=MiniMax-M3
+# MINIMAX_BASE_URL=https://api.minimax.io/anthropic
 
 # MAX_TOKENS=4096                                # Cap LLM completion tokens for compression / summarise calls
 
diff --git a/src/cli/onboarding.ts b/src/cli/onboarding.ts
index 6d0493554..926cdbea9 100644
--- a/src/cli/onboarding.ts
+++ b/src/cli/onboarding.ts
@@ -53,7 +53,7 @@ const PROVIDERS: { value: string; label: string; envKey: string | null }[] = [
   { value: "openai", label: "OpenAI — gpt", envKey: "OPENAI_API_KEY" },
   { value: "gemini", label: "Google — gemini", envKey: "GEMINI_API_KEY" },
   { value: "openrouter", label: "OpenRouter — multi-model", envKey: "OPENROUTER_API_KEY" },
-  { value: "minimax", label: "MiniMax — minimax-m1", envKey: "MINIMAX_API_KEY" },
+  { value: "minimax", label: "MiniMax — MiniMax-M3", envKey: "MINIMAX_API_KEY" },
   { value: "skip", label: "Skip — BM25-only mode (no LLM key)", envKey: null },
 ];
 
diff --git a/src/config.ts b/src/config.ts
index 3348ac226..b9f3d2d2d 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -67,7 +67,7 @@ function detectProvider(env: Record<string, string>): ProviderConfig {
   if (hasRealValue(env["MINIMAX_API_KEY"])) {
     return {
       provider: "minimax",
-      model: env["MINIMAX_MODEL"] || "MiniMax-M2.7",
+      model: env["MINIMAX_MODEL"] || "MiniMax-M3",
       maxTokens,
     };
   }
diff --git a/src/providers/index.ts b/src/providers/index.ts
index 0ec3feba0..35b2f3547 100644
--- a/src/providers/index.ts
+++ b/src/providers/index.ts
@@ -45,7 +45,7 @@ function defaultModelFor(providerType: ProviderConfig["provider"]): string {
         getEnvVar("OPENROUTER_MODEL") || "anthropic/claude-sonnet-4-20250514"
       );
     case "minimax":
-      return getEnvVar("MINIMAX_MODEL") || "MiniMax-M2.7";
+      return getEnvVar("MINIMAX_MODEL") || "MiniMax-M3";
     case "agent-sdk":
       return "claude-sonnet-4-20250514";
     case "noop":
diff --git a/src/providers/minimax.ts b/src/providers/minimax.ts
index 72fc9ec90..19c4ee021 100644
--- a/src/providers/minimax.ts
+++ b/src/providers/minimax.ts
@@ -10,11 +10,11 @@ import { fetchWithTimeout } from './_fetch.js'
  *
  * Required env vars (loaded from ~/.agentmemory/.env or process.env):
  *   MINIMAX_API_KEY  — your MiniMax API key
- *   MINIMAX_MODEL    — model name (default: MiniMax-M2.7)
- *   MAX_TOKENS       — max output tokens (default: 800; MiniMax-M2.7 needs ≤800)
+ *   MINIMAX_MODEL    — model name (default: MiniMax-M3)
+ *   MAX_TOKENS       — max output tokens (default: 4096)
  *
  * Optional:
- *   MINIMAX_BASE_URL — base URL without path (default: https://api.minimax.io/anthropic)
+ *   MINIMAX_BASE_URL — Anthropic-compatible base URL (default: https://api.minimax.io/anthropic)
  */
 export class MinimaxProvider implements MemoryProvider {
   name = 'minimax'
@@ -31,6 +31,10 @@ export class MinimaxProvider implements MemoryProvider {
       getEnvVar('MINIMAX_BASE_URL') || 'https://api.minimax.io/anthropic'
   }
 
+  private messagesUrl(): string {
+    return `${this.baseUrl.replace(/\/+$/, '')}/v1/messages`
+  }
+
   async compress(systemPrompt: string, userPrompt: string): Promise<string> {
     return this.call(systemPrompt, userPrompt)
   }
@@ -40,7 +44,7 @@ export class MinimaxProvider implements MemoryProvider {
   }
 
   private async call(systemPrompt: string, userPrompt: string): Promise<string> {
-    const url = `${this.baseUrl}/v1/messages`
+    const url = this.messagesUrl()
     const response = await fetchWithTimeout(url, {
       method: 'POST',
       headers: {
diff --git a/test/fallback-model-resolution.test.ts b/test/fallback-model-resolution.test.ts
index 91a821161..79c731a48 100644
--- a/test/fallback-model-resolution.test.ts
+++ b/test/fallback-model-resolution.test.ts
@@ -155,7 +155,7 @@ describe("Fallback provider model resolution (#778)", () => {
     const openai = captured.find((c) => c.provider === "openai");
     const minimax = captured.find((c) => c.provider === "minimax");
     expect(openai?.model).toBe("gpt-5");
-    expect(minimax?.model).toBe("MiniMax-M2.7");
+    expect(minimax?.model).toBe("MiniMax-M3");
     // Neither inherits the Anthropic model name.
     expect(openai?.model).not.toBe("claude-sonnet-4-20250514");
     expect(minimax?.model).not.toBe("claude-sonnet-4-20250514");
diff --git a/test/fetch-timeout.test.ts b/test/fetch-timeout.test.ts
index 5b2cd7c9c..7e9536de6 100644
--- a/test/fetch-timeout.test.ts
+++ b/test/fetch-timeout.test.ts
@@ -91,7 +91,7 @@ describe("Provider hang regression — MinimaxProvider", () => {
   });
 
   it("compress() aborts after timeout when upstream hangs", async () => {
-    const provider = new MinimaxProvider("test-key", "MiniMax-M2.7", 800);
+    const provider = new MinimaxProvider("test-key", "MiniMax-M3", 800);
     await expect(provider.compress("system", "user")).rejects.toThrow();
   });
 });
diff --git a/test/minimax-provider.test.ts b/test/minimax-provider.test.ts
index 4167d4b37..a11bd9794 100644
--- a/test/minimax-provider.test.ts
+++ b/test/minimax-provider.test.ts
@@ -12,17 +12,25 @@ describe("MinimaxProvider — base URL resolution (#285)", () => {
     }
   });
 
-  it("defaults to https://api.minimax.io/anthropic (not the legacy minimaxi.com host)", () => {
+  it("defaults to MiniMax's Anthropic-compatible base URL", () => {
     delete process.env["MINIMAX_BASE_URL"];
-    const provider = new MinimaxProvider("test-key", "MiniMax-M2.7", 800);
+    const provider = new MinimaxProvider("test-key", "MiniMax-M3", 800);
     expect((provider as unknown as { baseUrl: string }).baseUrl).toBe(
       "https://api.minimax.io/anthropic",
     );
   });
 
+  it("appends /v1/messages to MINIMAX_BASE_URL", () => {
+    process.env["MINIMAX_BASE_URL"] = "https://custom.example.com/anthropic/";
+    const provider = new MinimaxProvider("test-key", "MiniMax-M3", 800);
+    expect((provider as unknown as { messagesUrl: () => string }).messagesUrl()).toBe(
+      "https://custom.example.com/anthropic/v1/messages",
+    );
+  });
+
   it("honors MINIMAX_BASE_URL via getEnvVar (merged ~/.agentmemory/.env + process.env)", () => {
     process.env["MINIMAX_BASE_URL"] = "https://custom.example.com/anthropic";
-    const provider = new MinimaxProvider("test-key", "MiniMax-M2.7", 800);
+    const provider = new MinimaxProvider("test-key", "MiniMax-M3", 800);
     expect((provider as unknown as { baseUrl: string }).baseUrl).toBe(
       "https://custom.example.com/anthropic",
     );