OpenAI releases GPT-5.5 Instant, a new default model for ChatGPT

OpenAI 发布 GPT-5.5 Instant，成为 ChatGPT 的新默认模型

On Tuesday, OpenAI released a new foundation model called GPT-5.5 Instant, which will replace GPT-5.3 Instant as the default ChatGPT model. The company said the model reduces hallucination in sensitive areas such as law, medicine, and finance, while maintaining the low latency of its predecessor. 周二，OpenAI 发布了一款名为 GPT-5.5 Instant 的新基础模型，它将取代 GPT-5.3 Instant 成为 ChatGPT 的默认模型。该公司表示，该模型在法律、医疗和金融等敏感领域减少了“幻觉”现象，同时保持了前代产品的高响应速度。

OpenAI released the latest GPT-5.5 model last month with the company claiming improvements in areas like coding and knowledge work. The new model also achieved a score of 81.2 in the AIME 2025 math test, compared to 65.4 for the older model. It also outperformed its predecessor on the MMMU-Pro multimodal reasoning benchmark, with a score of 76 vs. 69.2. OpenAI 上个月发布了最新的 GPT-5.5 模型，并声称其在编程和知识工作等领域有所改进。新模型在 AIME 2025 数学测试中取得了 81.2 分的成绩，而旧模型为 65.4 分。在 MMMU-Pro 多模态推理基准测试中，它也以 76 分的成绩优于前代产品的 69.2 分。

The release placed a particular emphasis on context management. GPT-5.5 Instant can use its search tool to refer back to past conversations, files, and Gmail to give you more personalized answers. This feature will be available to Plus and Pro users on the web, with plans to roll it out to mobile soon. OpenAI said that it plans to extend access to this feature to Free, Go Business, and enterprise users in the coming weeks. 此次发布特别强调了上下文管理功能。GPT-5.5 Instant 可以利用搜索工具回顾过去的对话、文件和 Gmail 内容，从而提供更个性化的回答。该功能将首先向网页版的 Plus 和 Pro 用户开放，并计划很快推广至移动端。OpenAI 表示，计划在未来几周内将此功能扩展至免费版、Go Business 和企业版用户。

With this update, ChatGPT will also show memory sources across all models to help you understand where it generated the answers from. Users can delete outdated sources or correct them if the answer was wrong. Crucially, the company said that if you share a chat with someone, they won’t be able to see the memory sources. 随着此次更新，ChatGPT 还将在所有模型中显示记忆来源，以帮助用户了解答案的生成依据。用户可以删除过时的来源，或在答案错误时进行修正。关键的是，该公司表示，如果你与他人分享对话，对方将无法看到这些记忆来源。

For developers, the GPT-5.5 model will be available through API as “chat-latest,” with 5.3 available as an option for paid users for only three months. The company has faced rebuttal from previous model withdrawal moves. When OpenAI withdrew its GPT-4o model, there was significant backlash from users who related to the model’s “personality.” GPT-4o affirmed users’ choices frequently and that made them feel a connection to that particular model. Users who signed petitions to stop OpenAI from retiring it described the model as their “best friend” or “a mirror.” Despite the outcry, GPT-4o was deprecated in February 2026. 对于开发者而言，GPT-5.5 模型将通过 API 以“chat-latest”的形式提供，而 5.3 版本仅作为付费用户的选项保留三个月。该公司此前在下架旧模型时曾遭遇抵制。当 OpenAI 下架 GPT-4o 模型时，许多对该模型“个性”产生共鸣的用户表达了强烈不满。GPT-4o 经常肯定用户的选择，这让他们与该模型建立了情感连接。签署请愿书要求 OpenAI 不要停用该模型的用户将其描述为“最好的朋友”或“一面镜子”。尽管呼声很高，GPT-4o 还是在 2026 年 2 月被弃用。