Vercel AI SDKでClaudeを使用：createAnthropicのbaseURL、ストリーミング、問題の修正

npm i ai @ai-sdk/anthropic

import { createAnthropic } from '@ai-sdk/anthropic';

export const anthropic = createAnthropic({
  baseURL: 'https://aiprimetech.io/v1',                 // replaces https://api.anthropic.com/v1
  apiKey: process.env.AIPRIME_API_KEY,  // sent as x-api-key; defaults to ANTHROPIC_API_KEY
});

import { generateText } from 'ai';
import { anthropic } from './lib/anthropic';

const { text, usage } = await generateText({
  model: anthropic('claude-sonnet-5'),
  prompt: 'Explain idempotency keys in two sentences.',
});
console.log(text, usage);

import { streamText } from 'ai';
import { anthropic } from './lib/anthropic';

const result = streamText({
  model: anthropic('claude-sonnet-5'),
  prompt: 'Write a haiku about load balancers.',
});

for await (const chunk of result.textStream) process.stdout.write(chunk);

const { text } = await generateText({
  model: anthropic('claude-sonnet-5'),
  providerOptions: { anthropic: { thinking: { type: 'adaptive' } } },
  prompt: 'Plan a zero-downtime database migration in five steps.',
});

const result = await generateText({
  model: anthropic('claude-sonnet-5'),
  messages: [
    {
      role: 'system',
      content: longStableInstructions,
      providerOptions: { anthropic: { cacheControl: { type: 'ephemeral' } } },
    },
    { role: 'user', content: question },
  ],
});

import { createOpenAICompatible } from '@ai-sdk/openai-compatible';

const gateway = createOpenAICompatible({
  name: 'aiprime',
  baseURL: 'https://aiprimetech.io/v1',
  apiKey: process.env.AIPRIME_API_KEY,
});

// gateway('claude-sonnet-5') or a GPT model ID