Frontier · mobile

Use Claude Opus 4.5 with Kotlin (Android)

Updated 2026-05-21 · By XALEN

How to use Claude Opus 4.5 (Frontier, ~2.5T) with Kotlin (Android). Install, authenticate, and make your first API call in minutes. Working code example included.

Model

Claude Opus 4.5

~2.5T · 200K context · $0.15 input

Framework

Kotlin (Android)

mobile · implementation("com.squareup.okhttp3:okhttp:4.12.0")

1. Install

implementation("com.squareup.okhttp3:okhttp:4.12.0")

2. Code

import okhttp3.*
import org.json.JSONObject

suspend fun chat(question: String): String {
    val client = OkHttpClient()
    val body = JSONObject()
        .put("model", "claude-opus-4-5")
        .put("messages", org.json.JSONArray()
            .put(JSONObject().put("role", "user").put("content", question)))
    val request = Request.Builder()
        .url("https://api.xalen.io/v1/chat/completions")
        .addHeader("Authorization", "Bearer xln_test_YOUR_KEY")
        .post(body.toString().toRequestBody("application/json".toMediaType()))
        .build()
    val response = client.newCall(request).execute()
    val json = JSONObject(response.body!!.string())
    return json.getJSONArray("choices").getJSONObject(0)
        .getJSONObject("message").getString("content")
}

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Last updated: 2026-05-21