Comparison Table of all supported Decision Models

Provider	Module	Questions (yes/no, choice, scale)	Async (decideAsync)	Input	Probabilities and confidence	Refusals	Observability	Customizable HTTP Client	Local Deployment	Spring Boot
Ollama	langchain4j-ollama	✅/✅/✅	✅	text, structured, image	✅	❌	✅	✅	✅	🆘
OpenAI	langchain4j-open-ai	✅/✅/✅	✅	text, structured, image	✅	✅	✅	✅	❌	✅
OpenAI Official	langchain4j-open-ai-official	✅/✅/✅	✅	text, structured, image	✅	✅	✅		❌	✅
TypeSafe	langchain4j-typesafe	✅/✅/✅	✅	text, structured	✅	❌	✅	✅	✅ (any server implementing the System One API, see here)	🆘

Legend:

• ✅ means "supported"
• 🆘 means "not supported yet; please help us implement it"
• ❌ means "not supported by the provider"
• no mark means "not applicable" (OpenAI Official uses the HTTP client of the official OpenAI SDK, configurable with openAIClient(...))

Notes:

• "structured" input is a Map of named values. OpenAI sends it as text, TypeSafe and Ollama as a JSON object.
• Images on Ollama need a model with vision, such as Clef.
• Every implementation reports token usage. OpenAI also reports cached input tokens.