I need an AI API that can do classification and tagging

Yes — you want an AI API that supports classification and tagging. A few good options:

1) OpenAI API

You can use models like GPT-4.1 or GPT-4o for:

• Text classification: sentiment, intent, topic, spam/ham, routing, etc.
• Tagging: extract labels, categories, entities, or custom tags from text

Typical approach:

• Send the text
• Ask the model to return structured JSON
• Validate the output in your app

2) Anthropic API

Also strong for:

• Classification tasks
• Tag extraction/tagging
• Structured outputs

3) Google Cloud Natural Language / Vertex AI

Good if you want more traditional ML pipelines or enterprise integrations:

• Content classification
• Entity extraction
• Custom models

4) AWS Comprehend

Useful for:

• Text classification
• Entity recognition
• Key phrase extraction
• Language detection

If you want flexibility and accuracy

Use a general LLM API like OpenAI or Anthropic with a prompt such as:

{
  "text": "The customer wants a refund because the product arrived damaged.",
  "task": "classify and tag"
}

And get back:

{
  "category": "customer_support",
  "intent": "refund_request",
  "tags": ["refund", "damaged_product", "complaint"]
}

Recommendation

• Simple, fast setup: OpenAI API
• Enterprise NLP: AWS Comprehend or Google Vertex AI
• Best for custom tagging/classification: OpenAI or Anthropic with structured outputs

If you want, I can help you with:

1. a sample API request
2. a Python/JavaScript example
3. choosing the best model for your use case