AI Tools

Anthropic to OpenAI Prompt Converter

Paste an Anthropic Messages payload, convert it into OpenAI Messages format, and reuse the result in OpenAI API workflows. This page is useful for moving prompts from Anthropic or Claude-style workflows into OpenAI or ChatGPT-style message formats, prompt reuse, and API migrations.

Convert Anthropic Prompts to OpenAI Format

Convert Anthropic message templates into OpenAI message format for Chat Completions, Responses API workflows, and Claude-to-ChatGPT style migrations.

Source format

Target format

Prompt template JSON

Show line numbers

Converted template JSON

{
  "system": "You are a helpful assistant for software teams.",
  "messages": [
    {
      "role": "user",
      "content": "Summarize the release notes into five bullet points."
    }
  ]
}

Paste content and run the tool instantly.

Why Use This AI Prompt Template Converter

Convert text-only prompt templates between major provider formats
Reduce manual JSON reshaping when switching LLM APIs
Keep system, user, and assistant turns aligned across providers
Copy or download the converted template

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Common Situations Where This Helps

You built a prompt for OpenAI and need to move it into Anthropic.
A Gemini payload has to be mirrored in a multi-provider app.
You are testing a local Ollama model with a hosted provider prompt.
A team wants one base prompt template with provider-specific output shapes.

Which Tool Should You Choose?

AI Prompt Template Converter: Choose this when you need to reshape a provider-specific chat payload into another provider's message format.

AI Prompt Formatter: Choose the formatter when the prompt text itself is messy and needs cleanup before conversion.

More Prompt Template Converter Pages

Common Problems This Tool Solves

My OpenAI prompt template breaks when I move it to another provider. Convert the template into the target provider's message format instead of manually reshaping every field.

I need one prompt workflow to work across several model backends. Use the converter to generate the closest provider-specific JSON template for each API.

Switching between hosted and local models keeps wasting time on payload formatting. Convert the template first so your request body matches the expected message structure.

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Frequently Asked Questions

What does this AI prompt template converter do?

It converts text-based chat prompt templates between common provider request formats such as OpenAI Messages, Anthropic Messages, Gemini contents, and Ollama Chat, including common ChatGPT-style and Claude-style prompt workflows.

Will the converted template behave exactly the same on every provider?

Not always. Providers such as OpenAI, Anthropic, and Gemini differ in message semantics and advanced features, so this tool is best for text-only prompt templates rather than perfect behavioral parity between ChatGPT, Claude, and other model stacks.

Does it support multimodal parts or tool calls?

The current version is focused on text-only prompt templates. Payloads with images, tool calls, or other provider-specific advanced fields may need manual review.

Is this AI prompt template converter free?

Yes. It is free to use in your browser.