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Chinese commercial space firm completes long-duration test of reusable rocket engine_我的网站

落日余晖

A | 8 月 26 日消息，经过自 7 月 13 日开始为期六周的无每日使用额度限制后，OpenAI 正式恢复了针对标准版 ChatGPT Plus 用户的严格“五小时使用上限”，该限制适用于使用 Codex 和 ChatGPT Work 环境的用户。

B |

This photo shows the reusable rocket Nebula-1, developed by Chinese private rocket company Deep Blue Aerospace, blasting off during a high-altitude vertical recovery flight test in north China's Inner Mongolia Autonomous Region, Sept. 22, 2024. (Deep Blue Aerospace/Handout via Xinhua)
China's commercial reusable launch vehicle sector continues to make steady progress, as a company announced on Friday that it had completed a long-duration test firing of an engine for a large recoverable carrier rocket.
Deep Blue Aerospace, a commercial space startup based in Wuxi, east China's Jiangsu Province, said it recently completed a 100-second static-fire test of its Thunder-RS engine, a 130-tonne-class liquid-oxygen kerosene engine designed for the company's large reusable rocket, Nebula-2.
The test reached 1,297.5 kilonewtons of thrust, or about 132.3 tonnes. The company said multiple short-duration test firings had been conducted previously to evaluate engine performance, with no anomalies recorded.
The recent 100‑second run was the engine's first crossing of that steady‑state duration threshold, serving as a comprehensive verification of its performance, the company said.
This screenshot from a video clip shows the first stage of the Zhuque-3 Y2 rocket making its land-based recovery, Aug. 19, 2026. (LandSpace/Handout via Xinhua)

This screenshot from a video clip shows the first stage of the Zhuque-3 Y2 rocket making its land-based recovery, Aug. 19, 2026. (LandSpace/Handout via Xinhua)
Rocket reusability can greatly cut launch costs and boosts launch frequency, making it key to achieving large-scale, routine access to space.
China launched the reusable rocket Zhuque-3 on Wednesday morning, achieving its first recovery of a rocket's first stage on land, marking the country's first successful land-based recovery. This mission followed the successful sea-based net recovery of the Long March-10B's first stage on July 10.
More models of Chinese reusable rockets are scheduled to conduct tests this year.
。OpenAI Codex 和 ChatGPT 工程负责人 Thibault Sottiaux 在 X 上确认，滚动五小时限制于 8 月 25 日全面恢复。注意到，OpenAI 最初于 7 月中旬取消了这一五小时上限，当时公司推出了高效的 GPT-5.6 Sol 模型。取消限制后，用户仅受每周单次配额限制。

C | 在这段短暂的无限制窗口期内，OpenAI 甚至曾多次提前重置用户的每周使用额度，以庆祝用户增长里程碑，其中包括活跃用户数量再次突破 100 万。如今，这段临时的“宽限期”已经正式结束。

D | 这意味着开发者和重度用户再次需要合理控制技术类提示词的使用频率，否则可能会因为达到配额而无法继续使用服务。Sottiaux 解释称，恢复五小时限制主要基于两方面考虑。首先，将使用量划分到五小时窗口内，有助于分散计算需求，避免大量用户在同一时间集中使用服务，给 OpenAI 的服务器带来过大的负载。其次，这项限制也可以保护新用户和使用频率较低的用户。在临时取消限制期间，一些订阅用户会在一次长时间连续使用中不知不觉耗尽整周的配额，导致剩余一周时间都无法继续使用服务。标准版用户需要重新面对这些限制，以避免过快耗尽使用额度，但 OpenAI 并未对付费最高的用户实施这一调整。公司确认，未来几个月，价格更高的 Pro 100 美元（注：现汇率约合 673.7 元人民币）和 Pro 200 美元（现汇率约合 1,347 元人民币）订阅套餐仍将继续取消五小时使用限制。此外，Enterprise 和 Edu 账户也不会发生任何变化。