fix(core): add DeepSeek V4 Flash Vision to model metadata

packages/core/src/__tests__/model-catalog.test.ts

@@ -351,3 +351,34 @@ test('Alibaba (China) catalogs Qwen3.8 Max as the default model on the China end
   assert.deepEqual(model?.modalities, { input: ['text', 'image', 'pdf'], output: ['text'] });
   assert.equal(model?.canUseAsChatDefault, true);
 });
+
+test('DeepSeek catalogs the V4 vision model display metadata from a bare provider id', () => {
+  const modelId = 'deepseek-v4-flash-vision-exp';
+  const [model] = buildConnectionModelCatalogEntries({
+    connection: {
+      slug: 'deepseek',
+      providerType: 'deepseek',
+      defaultModel: modelId,
+      models: [{ id: modelId }],
+      modelSource: 'fetched',
+    },
+  });
+
+  assert.equal(model?.displayName, 'DeepSeek-V4-Flash-Vision-Exp');
+  assert.equal(
+    model?.description,
+    'Experimental DeepSeek V4 Flash model for image understanding and multimodal agent tasks',
+  );
+  assert.equal(model?.docsUrl, 'https://api-docs.deepseek.com/guides/vision/');
+  assert.equal(model?.contextWindow, 1_000_000);
+  assert.equal(model?.maxOutputTokens, 384_000);
+  assert.equal(model?.structuredOutput, true);
+  assert.equal(model?.lastUpdated, '2026-08-21');
+  assert.deepEqual(model?.capabilities, {
+    reasoning: true,
+    functionCalling: true,
+    vision: true,
+  });
+  assert.deepEqual(model?.modalities, { input: ['text', 'image'], output: ['text'] });
+  assert.equal(model?.canUseAsChatDefault, true);
+});

packages/core/src/__tests__/model-metadata.test.ts

@@ -20,8 +20,10 @@
 import { strict as assert } from 'node:assert';
 import { describe, it } from 'node:test';
 import {
+  curatedCatalogFallbackModelsForProvider,
   lookupModelMetadata,
   openAiAdapterApiProtocol,
+  resolveModelInputModalities,
   resolveModelVisionSupport,
 } from '../model-metadata.js';
 import type { ModelInfo, ProviderType } from '../llm-connections.js';
@@ -105,3 +107,68 @@ describe('openAiAdapterApiProtocol', () => {
     assert.equal(openAiAdapterApiProtocol('minimax-m3', 'opencode-go'), 'openai-chat');
   });
 });
+
+describe('deepseek v4 flash vision exp metadata regression', () => {
+  it('resolves the bare model id with vision support', () => {
+    assert.equal(
+      resolveModelVisionSupport('deepseek', undefined, 'deepseek-v4-flash-vision-exp'),
+      true,
+    );
+  });
+
+  it('accepts both text and image input modalities', () => {
+    const input = resolveModelInputModalities(
+      'deepseek',
+      undefined,
+      'deepseek-v4-flash-vision-exp',
+    );
+    assert.ok(input.includes('text'));
+    assert.ok(input.includes('image'));
+  });
+
+  it('keeps the model present in the deepseek fallback catalog', () => {
+    assert.ok(
+      curatedCatalogFallbackModelsForProvider('deepseek')?.includes('deepseek-v4-flash-vision-exp'),
+    );
+  });
+
+  it('returns expected metadata from lookupModelMetadata', () => {
+    const modelId = 'deepseek-v4-flash-vision-exp';
+    const metadata = lookupModelMetadata('deepseek', modelId);
+
+    assert.equal(metadata.displayName, 'DeepSeek-V4-Flash-Vision-Exp');
+    assert.equal(
+      metadata.description,
+      'Experimental DeepSeek V4 Flash model for image understanding and multimodal agent tasks',
+    );
+    assert.equal(metadata.docsUrl, 'https://api-docs.deepseek.com/guides/vision/');
+    assert.equal(metadata.contextWindow, 1_000_000);
+    assert.equal(metadata.maxOutputTokens, 384_000);
+    assert.equal(metadata.structuredOutput, true);
+    assert.equal(metadata.lastUpdated, '2026-08-21');
+    assert.deepEqual(metadata.thinkingOptions, {
+      efforts: ['low', 'high', 'max'],
+      toggle: true,
+    });
+    assert.equal(metadata.capabilities?.vision, true);
+    assert.deepEqual(metadata.modalities, { input: ['text', 'image'], output: ['text'] });
+  });
+
+  it('is recognized from a bare discovered id', () => {
+    const modelId = 'deepseek-v4-flash-vision-exp';
+    const discovered: ModelInfo[] = [{ id: modelId }];
+    const metadata = lookupModelMetadata('deepseek', modelId);
+
+    assert.equal(metadata.displayName, 'DeepSeek-V4-Flash-Vision-Exp');
+    assert.equal(metadata.capabilities?.vision, true);
+    assert.deepEqual(resolveModelInputModalities('deepseek', discovered, modelId), [
+      'text',
+      'image',
+    ]);
+    assert.equal(resolveModelVisionSupport('deepseek', discovered, modelId), true);
+    assert.equal(
+      resolveModelVisionSupport('deepseek', [{ id: 'deepseek-v4-flash' }], 'deepseek-v4-flash'),
+      false,
+    );
+  });
+});

packages/core/src/model-metadata.ts

@@ -435,6 +435,19 @@ const STATIC_MODEL_METADATA: Partial<Record<ProviderType, Record<string, ModelMe
       lastUpdated: '2026-08-24',
       thinkingOptions: { efforts: ['low', 'high', 'max'], toggle: true },
     },
+    'deepseek-v4-flash-vision-exp': {
+      capabilities: { vision: true, ...REASONING_FUNCTION_CALLING, webSearch: true },
+      thinkingOptions: { efforts: ['low', 'high', 'max'], toggle: true },
+      modalities: { input: ['text', 'image'], output: ['text'] },
+      displayName: 'DeepSeek-V4-Flash-Vision-Exp',
+      description:
+        'Experimental DeepSeek V4 Flash model for image understanding and multimodal agent tasks',
+      docsUrl: 'https://api-docs.deepseek.com/guides/vision/',
+      contextWindow: 1_000_000,
+      maxOutputTokens: 384_000,
+      structuredOutput: true,
+      lastUpdated: '2026-08-21',
+    },
     'deepseek-v4-pro': {
       capabilities: { ...REASONING_FUNCTION_CALLING, webSearch: true },
       lastUpdated: '2026-08-13',
@@ -580,7 +593,13 @@ const CURATED_CATALOG_FALLBACK_MODELS: Partial<Record<ProviderType, readonly str
     'claude-sonnet-4-5-20250929',
   ],
   openai: ['gpt-5.5', 'gpt-5.5-pro', 'gpt-5.4', 'gpt-5.4-mini', 'gpt-5'],
-  deepseek: ['deepseek-v4-flash', 'deepseek-v4-pro', 'deepseek-reasoner', 'deepseek-chat'],
+  deepseek: [
+    'deepseek-v4-flash',
+    'deepseek-v4-flash-vision-exp',
+    'deepseek-v4-pro',
+    'deepseek-reasoner',
+    'deepseek-chat',
+  ],
   google: ['gemini-3.5-flash', 'gemini-3.1-pro-preview', 'gemini-2.5-pro', 'gemini-2.5-flash'],
   'zai-coding-plan': ['glm-5.2', 'glm-5.1', 'glm-5-turbo', 'glm-4.7', 'glm-4.5-air'],
   MiniMax: ['MiniMax-M3'],