diff --git a/deployment/aimaq.env.production b/deployment/aimaq.env.production
index 87c28cb..cf97bb8 100644
--- a/deployment/aimaq.env.production
+++ b/deployment/aimaq.env.production
@@ -10,10 +10,10 @@ ALLOW_LEGACY_HEADER_AUTH=0
 
 AI_PROVIDER=openai_compatible
 AI_API_BASE=https://api.openai.com/v1
-AI_API_KEY=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
-AI_MODEL=gpt-4o-mini
+AI_API_KEY=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
+AI_MODEL=gpt-5-nano
 AI_TIMEOUT_SECONDS=30
-AI_VOICE_AI_TIMEOUT_SECONDS=10
+AI_VOICE_AI_TIMEOUT_SECONDS=15
 AI_WEB_SEARCH_ENABLED=1
 AI_WEB_SEARCH_MAX_RESULTS=5
 AI_WEB_SEARCH_GL=kz
diff --git a/services/ai_orchestrator_service/app.py b/services/ai_orchestrator_service/app.py
index b3111cf..603763f 100644
--- a/services/ai_orchestrator_service/app.py
+++ b/services/ai_orchestrator_service/app.py
@@ -2357,13 +2357,18 @@ def _request_structured_model_decision(
     if not _ai_api_base() or not _ai_api_key():
         raise RuntimeError("AI_API_BASE / AI_API_KEY are required for openai_compatible provider")
     started = time.perf_counter()
-    payload = {
-        "model": _ai_model(),
-        "temperature": 0.2,
-        "max_tokens": _ai_decision_max_tokens(),
+    model = _ai_model()
+    payload: dict[str, Any] = {
+        "model": model,
         "response_format": {"type": "json_object"},
         "messages": messages,
     }
+    if model.startswith("gpt-5"):
+        payload["max_completion_tokens"] = _ai_decision_max_tokens()
+        payload["reasoning_effort"] = "minimal"
+    else:
+        payload["temperature"] = 0.2
+        payload["max_tokens"] = _ai_decision_max_tokens()
     effective_timeout = timeout_seconds if timeout_seconds is not None else _ai_timeout_seconds()
     with httpx.Client(timeout=effective_timeout) as client:
         response = client.post(