据爆料，OpenAI 计划下周发布代号 mewfour 的全新模型 Astra，系 GPT-4.5 后最大规模预训练模型，标志重大能力跃升。其内部版本已成功解出 10 个重要开放数学问题，所需算力成本约 2000 美元（约 1.35 万元人民币），展现出强大的复杂推理实力。
OpenAI宣布将从ChatGPT平台退役两款经典大模型：文科天才GPT-4.5将于6月27日下线，硬核推理模型o3于8月26日告别。这一调整引发业界震动，也让付费老用户感到不舍。
GitHub泄露文档显示OpenAI将推出GPT-5系列四款模型：主打逻辑推理的标准版、轻量mini版、低延迟nano版和企业级chat版。新模型在代码生成和推理能力上有提升，但内部测试表明性能增幅不及GPT-3到GPT-4的飞跃。此前GPT-4.5因表现不佳被放弃，而GPT-5试图通过动态资源分配机制，在高级推理与日常对话间取得平衡。这次升级更偏向渐进式改进，实际效果尚待验证。
OpenAI下一代大模型GPT-5聚焦实用性提升：1）代码生成更清晰高效；2）推理效率显著优化；3）引入"Universal Verifier"机制减少错误。同时披露GPT-4.5因数据瓶颈和技术路线问题折戟，以及公司内部管理层摩擦等挑战。微软持有33%股份，OpenAI正筹备IPO。GPT-5的技术突破将面临数据稀缺和管理问题的双重考验，其表现将决定OpenAI能否继续领跑AI行业。
OpenAI推出的最新语言模型GPT-4.5，专注于提升无监督学习能力，提供更自然的交互体验。
Openai
$2.8
输入tokens/百万
$11.2
输出tokens/百万
1k
上下文长度
-
Bytedance
$0.8
$2
128
$8.75
$70
400
$1.75
$14
$0.35
Alibaba
64
Chatglm
$8
$16
$1.8
$5.4
16
Tencent
32
$17.5
$56
$0.7
$2.4
$9.6
$525
$1050
Xai
$21
$105
$3.5
$10.5
Baidu
$1
$4
$420
200
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