<dependency>
    <groupId>io.agentscope</groupId>
    <artifactId>agentscope-extensions-model-openai-official</artifactId>
    <version>${agentscope.version}</version>
</dependency>

ReActAgent agent = ReActAgent.builder()
    .name("assistant")
    .model("openai-official:gpt-4o")
    .build();

import io.agentscope.extensions.model.openaiofficial.OpenAIResponsesChatModel;

OpenAIResponsesChatModel model = OpenAIResponsesChatModel.builder()
    .apiKey(System.getenv("OPENAI_API_KEY"))
    .modelName("gpt-4o")
    .stream(true)
    .build();

GenerateOptions options = GenerateOptions.builder()
    .reasoningEffort("high")
    .additionalBodyParam("reasoning.summary", "auto")
    .build();