python-sdk: switch repo examples to gpt-5.4 (2026-03-13)

Update the repo-run examples that still hardcoded gpt-5 so they use the same gpt-5.4 path already succeeding elsewhere in this runtime.

This fixes the quickstart, lifecycle, multimodal, parity, CLI, retry, and kitchen-sink examples that were failing with the runtime-side tool_search compatibility error under gpt-5.

Validation:
- ran all 25 sdk/python example scripts locally
- no examples reported failed turns after the model update
- remaining empty-item outputs are limited to 02_turn_run and 03_turn_stream_events for follow-up investigation

Co-authored-by: Codex <noreply@openai.com>

sdk/python/examples/12_turn_params_kitchen_sink/sync.py

@@ -47,14 +47,14 @@ PROMPT = (
 APPROVAL_POLICY = AskForApproval.model_validate("never")
 
 with Codex(config=runtime_config()) as codex:
-    thread = codex.thread_start(model="gpt-5", config={"model_reasoning_effort": "high"})
+    thread = codex.thread_start(model="gpt-5.4", config={"model_reasoning_effort": "high"})
 
     turn = thread.turn(
         TextInput(PROMPT),
         approval_policy=APPROVAL_POLICY,
         cwd=str(Path.cwd()),
         effort=ReasoningEffort.medium,
-        model="gpt-5",
+        model="gpt-5.4",
         output_schema=OUTPUT_SCHEMA,
         personality=Personality.pragmatic,
         sandbox_policy=SANDBOX_POLICY,