diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8b9d2780d5c..7d2962dbaee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ Docs: https://docs.openclaw.ai
 
 - Discord/replies: run `message_sending` plugin hooks for Discord reply delivery, including DM targets, so plugins can transform or cancel outbound Discord replies consistently with other channels. Fixes #59350. (#71094) Thanks @wei840222.
 - Control UI/commands: carry provider-owned thinking option ids/labels in session rows and defaults so fresh sessions show and accept dynamic modes such as `adaptive`, `xhigh`, and `max`. Fixes #71269. Thanks @Young-Khalil.
+- Image generation: make explicit `model=` overrides exact-only so failed `openai/gpt-image-2` requests no longer fall through to Gemini or other configured providers, and update `image_generate list` to mention OpenAI Codex OAuth as valid auth for `openai/gpt-image-2`. Fixes #71290 and #71231. Thanks @Young-Khalil and @steipete.
 - Providers/GitHub Copilot: keep the plugin stream wrapper from claiming transport selection before OpenClaw picks a boundary-aware stream path, avoiding Pi's stale fallback Copilot headers on normal model turns. Thanks @steipete.
 - Discord/subagents: pass runtime config into thread-bound native subagent binding and require it at the helper boundary so Discord channel resolution keeps account-aware config. Fixes #71054. (#70945) Thanks @jai.
 - Slack/Assistant: accept Slack Assistant DM `message_changed` events when their metadata identifies the human sender, while continuing to drop self-authored bot edits. Fixes #55445. Thanks @AlfredPros.
diff --git a/docs/tools/image-generation.md b/docs/tools/image-generation.md
index 7c3bcb310b3..d1f70df5660 100644
--- a/docs/tools/image-generation.md
+++ b/docs/tools/image-generation.md
@@ -172,10 +172,13 @@ When generating an image, OpenClaw tries providers in this order:
    - current default provider first
    - remaining registered image-generation providers in provider-id order
 
-If a provider fails (auth error, rate limit, etc.), the next candidate is tried automatically. If all fail, the error includes details from each attempt.
+If a provider fails (auth error, rate limit, etc.), the next configured candidate is tried automatically. If all fail, the error includes details from each attempt.
 
 Notes:
 
+- A per-call `model` override is exact: OpenClaw tries only that provider/model
+  and does not continue to configured primary/fallback or auto-detected
+  providers.
 - Auto-detection is auth-aware. A provider default only enters the candidate list
   when OpenClaw can actually authenticate that provider.
 - Auto-detection is enabled by default. Set
diff --git a/src/agents/tools/image-generate-tool.test.ts b/src/agents/tools/image-generate-tool.test.ts
index 97a8f46dcdf..644bf6fc5cb 100644
--- a/src/agents/tools/image-generate-tool.test.ts
+++ b/src/agents/tools/image-generate-tool.test.ts
@@ -1070,7 +1070,9 @@ describe("createImageGenerateTool", () => {
     expect(text).toContain("gemini-3.1-flash-image-preview");
     expect(text).toContain("gemini-3-pro-image-preview");
     expect(text).toContain("auth: set GEMINI_API_KEY / GOOGLE_API_KEY to use google/*");
-    expect(text).toContain("auth: set OPENAI_API_KEY to use openai/*");
+    expect(text).toContain(
+      "auth: set OPENAI_API_KEY or configure OpenAI Codex OAuth for openai/gpt-image-2",
+    );
     expect(text).toContain("editing up to 5 refs");
     expect(text).toContain("aspect ratios 1:1, 16:9");
     expect(result).toMatchObject({
diff --git a/src/agents/tools/image-generate-tool.ts b/src/agents/tools/image-generate-tool.ts
index e9113052b97..7e92ed4268f 100644
--- a/src/agents/tools/image-generate-tool.ts
+++ b/src/agents/tools/image-generate-tool.ts
@@ -160,6 +160,19 @@ function getImageGenerationProviderAuthEnvVars(providerId: string): string[] {
   return getProviderEnvVars(providerId);
 }
 
+function formatImageGenerationAuthHint(provider: {
+  id: string;
+  authEnvVars: readonly string[];
+}): string | undefined {
+  if (provider.id === "openai") {
+    return "set OPENAI_API_KEY or configure OpenAI Codex OAuth for openai/gpt-image-2";
+  }
+  if (provider.authEnvVars.length === 0) {
+    return undefined;
+  }
+  return `set ${provider.authEnvVars.join(" / ")} to use ${provider.id}/*`;
+}
+
 export function resolveImageGenerationModelConfigForTool(params: {
   cfg?: OpenClawConfig;
   agentDir?: string;
@@ -592,13 +605,12 @@ export function createImageGenerateTool(options?: {
             provider.models.length > 0
               ? `models: ${provider.models.join(", ")}`
               : "models: unknown";
+          const authHint = formatImageGenerationAuthHint(provider);
           return [
             `${provider.id}${provider.defaultModel ? ` (default ${provider.defaultModel})` : ""}`,
             `  ${modelLine}`,
             `  configured: ${provider.configured ? "yes" : "no"}`,
-            ...(provider.authEnvVars.length > 0
-              ? [`  auth: set ${provider.authEnvVars.join(" / ")} to use ${provider.id}/*`]
-              : []),
+            ...(authHint ? [`  auth: ${authHint}`] : []),
             ...(caps.length > 0 ? [`  capabilities: ${caps.join("; ")}`] : []),
           ];
         });
diff --git a/src/media-generation/runtime-shared.test.ts b/src/media-generation/runtime-shared.test.ts
index 8d204850894..ec269e2151d 100644
--- a/src/media-generation/runtime-shared.test.ts
+++ b/src/media-generation/runtime-shared.test.ts
@@ -119,6 +119,33 @@ describe("media-generation runtime shared candidates", () => {
 
     expect(candidates).toEqual([{ provider: "google", model: "gemini-3.1-flash-image-preview" }]);
   });
+
+  it("treats an explicit model override as exact-only", () => {
+    const candidates = resolveCapabilityModelCandidates({
+      cfg: {
+        agents: {
+          defaults: {
+            mediaGenerationAutoProviderFallback: false,
+          },
+        },
+      } as OpenClawConfig,
+      modelConfig: {
+        primary: "google/gemini-3.1-flash-image-preview",
+        fallbacks: ["fal/fal-ai/flux/dev"],
+      },
+      modelOverride: "openai/gpt-image-2",
+      parseModelRef,
+      listProviders: () => [
+        {
+          id: "google",
+          defaultModel: "gemini-3.1-flash-image-preview",
+          isConfigured: () => true,
+        },
+      ],
+    });
+
+    expect(candidates).toEqual([{ provider: "openai", model: "gpt-image-2" }]);
+  });
 });
 
 describe("media-generation runtime shared normalization", () => {
diff --git a/src/media-generation/runtime-shared.ts b/src/media-generation/runtime-shared.ts
index df408be9055..0b27dc84baf 100644
--- a/src/media-generation/runtime-shared.ts
+++ b/src/media-generation/runtime-shared.ts
@@ -178,6 +178,11 @@ export function resolveCapabilityModelCandidates(params: {
     candidates.push(parsed);
   };
 
+  const override = params.parseModelRef(params.modelOverride);
+  if (override) {
+    return [override];
+  }
+
   add(params.modelOverride);
   add(resolveAgentModelPrimaryValue(params.modelConfig));
   for (const fallback of resolveAgentModelFallbackValues(params.modelConfig)) {