GPT‑5.5 和 GPT‑5.5 Pro 现已在 API 中可用
GPT-5.5 默认采用 medium 级推理强度 更高效的推理意味着，在升级之前，应重新评估 low 和 medium 这两个级别。 图像输入默认会保留更多视觉细节： 当 image_detail 未设置或设为 auto 时，模型现在会采用 original 行为，在不调整大小
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