Remove duplicate paragraph in prompting guide

examples/gpt-5/gpt-5_prompting_guide.ipynb

@@ -131,10 +131,6 @@
     "\n",
     "### Reasoning Effort\n",
     "We provide a `reasoning_effort` parameter to control how hard the model thinks and how willingly it calls tools; the default is `medium`, but you should scale up or down depending on the difficulty of your task. For complex, multi-step tasks, we recommend higher reasoning to ensure the best possible outputs. Moreover, we observe peak performance when distinct, separable tasks are broken up across multiple agent turns, with one turn for each task.\n",
-    "Reusing reasoning context with the Responses API\n",
-    "We strongly recommend using the Responses API when using GPT-5 to unlock improved agentic flows, lower costs, and more efficient token usage in your applications.\n",
-    "\n",
-    "We’ve seen statistically significant improvements in evaluations when using the Responses API over Chat Completions—for example, Taubench-Retail score increases from 73.9% to 78.2% just by switching to the Responses API and including previous_response_id to pass back previous reasoning items into subsequent requests. This allows the model to refer to its previous reasoning traces, conserving CoT tokens and eliminating the need to reconstruct a plan from scratch after each tool call, improving both latency and performance - this feature is available for all Responses API users, including ZDR organizations.\n",
     "\n",
     "### Reusing reasoning context with the Responses API\n",
     "We strongly recommend using the Responses API when using GPT-5 to unlock improved agentic flows, lower costs, and more efficient token usage in your applications.\n",