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A plugin that calls OpenAI and Claude APIs for translation with the following features:

• Support for multiple models
• Customizable API URL
• Customizable prompts
• Adjustable temperature parameter
• Glossary integration

Usage

Using OpenAI or Claude API requires an API KEY. This project does not provide API keys.

1. Download the jar file from releases and place it in the OmegaT plugins directory. This directory should be in the plugins folder under your OmegaT installation directory by default.
2. (Required) Open OmegaT, go to Options - Preferences - Machine Translation, select Openai Translator, click Configure, and enter your apikey.
3. (Required) Enter the corresponding URL in the URL field.
4. (Optional) Enter a custom prompt in the Prompt field. If not needed, leave it empty. If you choose to customize, language auto-detection will be disabled, and you'll need to specify the target language in your prompt. If left empty, the default prompt will be used with automatic target language setting.
5. (Optional) Modify the temperature parameter, default is 0.
6. (Optional) Modify the API format. Some service providers use OpenAI's API format for Claude models. If you don't understand this option, please don't change the default setting. It will automatically determine the API format based on the selected model. Default is set to 'default'.
7. Select the model you want to use from the dropdown list, or check the Use Custom Model checkbox to enter a custom model name manually. This allows you to use models not listed in the dropdown.
8. (Optional) Enable the glossary feature. When enabled, matching glossary terms for the current segment will be sent to the API along with the text.
9. (Optional) Enable caching. When enabled, previously translated results will be searched first. Cache is cleared when the project is closed.
10. Finally, check Enable, click OK and close the preferences window.

Currently Supported Models

The following models are currently supported:

Model Name	Provider
gpt-5	OpenAI
gpt-5-mini	OpenAI
gpt-5-nano	OpenAI
gpt-4.1	OpenAI
gpt-4.1-mini	OpenAI
gpt-4.1-nano	OpenAI
gpt-4o	OpenAI
gpt-4o-2024-11-20	OpenAI
gpt-4o-2024-08-06	OpenAI
gpt-4o-2024-05-13	OpenAI
gpt-4o-mini	OpenAI
gpt-4	OpenAI
gpt-4-turbo	OpenAI
gpt-3.5-turbo	OpenAI
gpt-3.5	OpenAI
claude-opus-4-1-20250805	Claude
claude-opus-4-20250514	Claude
claude-sonnet-4-20250514	Claude
claude-3-7-sonnet-20250219	Claude
claude-3-5-sonnet-20241022	Claude
claude-3-5-sonnet-20240620	Claude
claude-3-opus-20240229	Claude
claude-3-sonnet-20240229	Claude
claude-3-5-haiku-20241022	Claude
claude-3-haiku-20240307	Claude
deepseek-chat	DeepSeek

Some models may not have been tested. If you encounter any issues, please report them through issues. If you need additional models added, please also request through issues.

Custom Model Support

If you need to use a model that's not listed in the dropdown, you can use the Use Custom Model feature:

1. Check the Use Custom Model checkbox at the bottom of the configuration dialog
2. When checked, the model dropdown will be replaced with a text input field
3. Enter the exact model name as required by your API provider
4. This is useful for:
   • Newly released models that haven't been added to the list yet
   • Custom fine-tuned models
   • Models from alternative API providers that use compatible formats

About Prompts

Translation Prompt

The default prompt is Please translate the following text from {source language} to {target language}. To maintain flexibility for custom prompts, special prompt techniques are not hardcoded. If needed, you can set your own prompt. For example, if you encounter responses unrelated to translation, you can add translation-specific prompts and emphasize at the end not to return content unrelated to the translation.

Glossary-related Prompt

The glossary section is appended directly after the translation prompt in the format: You can refer to the following glossary when translating: {glossary}. If there are no matching glossary terms for the current segment, this prompt will not be added.

License

This project is licensed under GPL 3.0.

Thanks to omegat-niutrans-plugin project and azure-translate-plugin project. Some code in this project is forked from these two projects.