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* Model factory — hybrid Strands-native + Vercel AI SDK bridge.\n *\n * Native Strands models are used where they work cleanly in the browser:\n * - anthropic → AnthropicModel (dangerouslyAllowBrowser)\n * - openai → OpenAIModel (dangerouslyAllowBrowser)\n * - google → GoogleModel (browser-friendly by default)\n *\n * Everything else — including Bedrock with bearer-token auth — goes\n * through VercelModel wrapping the corresponding @ai-sdk/.\n * This unlocks ~8 extra providers without writing any glue:\n * - bedrock → @ai-sdk/amazon-bedrock (bearer token, no SigV4)\n * - openrouter → @openrouter/ai-sdk-provider (300+ models behind 1 key)\n * - groq, mistral, deepseek, cohere, perplexity, xai → their @ai-sdk/* pkgs\n * - webllm → VercelModel + @browser-ai/web-llm (on-device)\n *\n * Why hybrid? Native models have slightly richer event shapes (reasoning,\n * cache deltas, citations) that don't round-trip through LanguageModelV3\n * cleanly yet. For the providers where that matters (Anthropic / OpenAI /\n * Google direct) we stay native; for the rest VercelModel is excellent.\n *\n * See:\n * - https://github.com/strands-agents/sdk-typescript/tree/main/packages/sdk/src/models\n * - https://sdk.vercel.ai/providers/ai-sdk-providers\n */\nimport type { Settings } from '../types/index'\n\nexport async function createModel(settings: Settings): Promise {\n const { provider, model, apiKey } = settings\n const maxTokens = settings.maxTokens\n const params: Record = {}\n if (typeof settings.temperature === 'number') params.temperature = settings.temperature\n if (typeof settings.topP === 'number') params.top_p = settings.topP\n if (settings.stopSequences?.length) params.stop_sequences = settings.stopSequences\n\n switch (provider) {\n /* ── Native Strands models (richest event shapes) ─────────────── */\n\n case 'anthropic': {\n const { AnthropicModel } = await import('@strands-agents/sdk/models/anthropic')\n return new AnthropicModel({\n apiKey,\n modelId: model || 'claude-opus-4-7',\n ...(typeof maxTokens === 'number' ? { maxTokens } : {}),\n ...(Object.keys(params).length ? { params } : {}),\n clientConfig: { dangerouslyAllowBrowser: true },\n })\n }\n\n case 'openai': {\n const { OpenAIModel } = await import('@strands-agents/sdk/models/openai')\n return new OpenAIModel({\n api: 'chat',\n apiKey,\n modelId: model || 'gpt-5.5-2026-04-23',\n ...(typeof maxTokens === 'number' ? { maxTokens } : {}),\n ...(Object.keys(params).length ? { params } : {}),\n clientConfig: { dangerouslyAllowBrowser: true },\n } as any)\n }\n\n case 'google': {\n const { GoogleModel } = await import('@strands-agents/sdk/models/google')\n return new GoogleModel({\n apiKey,\n modelId: model || 'gemini-2.5-flash',\n ...(typeof maxTokens === 'number' ? { maxTokens } : {}),\n ...(Object.keys(params).length ? { params } : {}),\n })\n }\n\n /* ── Vercel AI SDK bridges ────────────────────────────────────── */\n\n case 'bedrock': {\n // @ai-sdk/amazon-bedrock has first-class bearer-token auth via apiKey,\n // bypassing SigV4 entirely (browser-safe).\n // https://sdk.vercel.ai/providers/ai-sdk-providers/amazon-bedrock\n if (!apiKey) throw new Error('Bedrock API key is missing. Add it in Settings → Model.')\n const [{ createAmazonBedrock }, { VercelModel }] = await Promise.all([\n import('@ai-sdk/amazon-bedrock'),\n import('@strands-agents/sdk/models/vercel'),\n ])\n const bedrock = createAmazonBedrock({\n apiKey,\n region: settings.bedrockRegion || 'us-west-2',\n })\n const lm = bedrock(model || 'global.anthropic.claude-opus-4-7')\n return new VercelModel({\n provider: lm,\n ...(typeof maxTokens === 'number' ? { maxOutputTokens: maxTokens } : {}),\n ...(typeof settings.temperature === 'number' ? { temperature: settings.temperature } : {}),\n ...(typeof settings.topP === 'number' ? { topP: settings.topP } : {}),\n ...(settings.stopSequences?.length ? { stopSequences: settings.stopSequences } : {}),\n } as any)\n }\n\n case 'openrouter': {\n // 300+ models (Claude, GPT, Llama, Mixtral, Qwen, DeepSeek, etc.) through 1 key.\n // https://openrouter.ai/docs\n if (!apiKey) throw new Error('OpenRouter API key is missing.')\n const [{ createOpenRouter }, { VercelModel }] = await Promise.all([\n import('@openrouter/ai-sdk-provider'),\n import('@strands-agents/sdk/models/vercel'),\n ])\n const openrouter = createOpenRouter({ apiKey })\n const lm = openrouter(model || 'anthropic/claude-opus-4.7')\n return new VercelModel({\n provider: lm,\n ...(typeof maxTokens === 'number' ? { maxOutputTokens: maxTokens } : {}),\n ...(typeof settings.temperature === 'number' ? { temperature: settings.temperature } : {}),\n ...(typeof settings.topP === 'number' ? { topP: settings.topP } : {}),\n } as any)\n }\n\n case 'groq': {\n if (!apiKey) throw new Error('Groq API key is missing.')\n const [{ createGroq }, { VercelModel }] = await Promise.all([\n import('@ai-sdk/groq'),\n import('@strands-agents/sdk/models/vercel'),\n ])\n const groq = createGroq({ apiKey })\n return new VercelModel({\n provider: groq(model || 'llama-3.3-70b-versatile'),\n ...(typeof maxTokens === 'number' ? { maxOutputTokens: maxTokens } : {}),\n ...(typeof settings.temperature === 'number' ? { temperature: settings.temperature } : {}),\n } as any)\n }\n\n case 'mistral': {\n if (!apiKey) throw new Error('Mistral API key is missing.')\n const [{ createMistral }, { VercelModel }] = await Promise.all([\n import('@ai-sdk/mistral'),\n import('@strands-agents/sdk/models/vercel'),\n ])\n const mistral = createMistral({ apiKey })\n return new VercelModel({\n provider: mistral(model || 'mistral-large-latest'),\n ...(typeof maxTokens === 'number' ? { maxOutputTokens: maxTokens } : {}),\n ...(typeof settings.temperature === 'number' ? { temperature: settings.temperature } : {}),\n } as any)\n }\n\n case 'deepseek': {\n if (!apiKey) throw new Error('DeepSeek API key is missing.')\n const [{ createDeepSeek }, { VercelModel }] = await Promise.all([\n import('@ai-sdk/deepseek'),\n import('@strands-agents/sdk/models/vercel'),\n ])\n const deepseek = createDeepSeek({ apiKey })\n return new VercelModel({\n provider: deepseek(model || 'deepseek-chat'),\n ...(typeof maxTokens === 'number' ? { maxOutputTokens: maxTokens } : {}),\n ...(typeof settings.temperature === 'number' ? { temperature: settings.temperature } : {}),\n } as any)\n }\n\n case 'cohere': {\n if (!apiKey) throw new Error('Cohere API key is missing.')\n const [{ createCohere }, { VercelModel }] = await Promise.all([\n import('@ai-sdk/cohere'),\n import('@strands-agents/sdk/models/vercel'),\n ])\n const cohere = createCohere({ apiKey })\n return new VercelModel({\n provider: cohere(model || 'command-r-plus'),\n ...(typeof maxTokens === 'number' ? { maxOutputTokens: maxTokens } : {}),\n ...(typeof settings.temperature === 'number' ? { temperature: settings.temperature } : {}),\n } as any)\n }\n\n case 'perplexity': {\n if (!apiKey) throw new Error('Perplexity API key is missing.')\n const [{ createPerplexity }, { VercelModel }] = await Promise.all([\n import('@ai-sdk/perplexity'),\n import('@strands-agents/sdk/models/vercel'),\n ])\n const pplx = createPerplexity({ apiKey })\n return new VercelModel({\n provider: pplx(model || 'sonar-pro'),\n ...(typeof maxTokens === 'number' ? { maxOutputTokens: maxTokens } : {}),\n ...(typeof settings.temperature === 'number' ? { temperature: settings.temperature } : {}),\n } as any)\n }\n\n case 'xai': {\n if (!apiKey) throw new Error('xAI API key is missing.')\n const [{ createXai }, { VercelModel }] = await Promise.all([\n import('@ai-sdk/xai'),\n import('@strands-agents/sdk/models/vercel'),\n ])\n const xai = createXai({ apiKey })\n return new VercelModel({\n provider: xai(model || 'grok-2-latest'),\n ...(typeof maxTokens === 'number' ? { maxOutputTokens: maxTokens } : {}),\n ...(typeof settings.temperature === 'number' ? { temperature: settings.temperature } : {}),\n } as any)\n }\n\n case 'webllm': {\n // 100% local via WebGPU\n const [{ VercelModel }, { createWebLLM, doesBrowserSupportWebLLM }] = await Promise.all([\n import('@strands-agents/sdk/models/vercel'),\n import('@browser-ai/web-llm'),\n ])\n if (!doesBrowserSupportWebLLM()) {\n throw new Error('WebLLM requires WebGPU. Try Chrome/Edge on desktop.')\n }\n const client = createWebLLM()\n const lm = client(model || 'Qwen2.5-0.5B-Instruct-q4f16_1-MLC')\n return new VercelModel({\n provider: lm,\n ...(typeof maxTokens === 'number' ? { maxOutputTokens: maxTokens } : {}),\n } as any)\n }\n\n default: {\n // Fall back to anthropic — old behavior\n const { AnthropicModel } = await import('@strands-agents/sdk/models/anthropic')\n return new AnthropicModel({\n apiKey,\n modelId: model || 'claude-opus-4-7',\n clientConfig: { dangerouslyAllowBrowser: true },\n })\n }\n }\n}\n"]}