What are the strengths of each machine translation engine?

You can download engines comparison table from here:

Yaraku Engine 5: Has adaptation and document level translation functions, across the

segments. Excels in better context handling and style control.

GPT-5.6 Terra: Prompt setting is available, newest version has improved prompt's following ability. Recommended for formal research papers and other logical structure required texts.
GPT-5.6 Luna: Faster and light weighted model of the standard GPT-5.6 Terra version, enabling faster processing.
Claude Sonnet 5.4: Prompt setting is available. Suitable for casual blogs, emails, scenarios translations, known for natural style translation.
Gemini 3.0 Flash: The fastest engines between the Generative AI engines, also recognized for deeper contextual understanding.

Google Translate: Suitable for formal documents such as contracts and Terms of Use.
Microsoft Translate: It is trained on MS products such as Windows and Office, so it is ideal for IT translations.
Papago Translate: Suitable for translating Korean, provides natural translations rather than literal translations.