In case you missed it, these were the four TBC posts that traveled most this week, and they mostly sit on the same side of the AI stack: what it costs to train, serve, and govern frontier models.
1. DeepSeek founder Liang Wenfeng is among 130+ authors on a paper describing DSec, the elastic compute sandbox behind the company's agent RL training. The platform serves about 3 million sandboxes per day, with peak concurrency above 380,000 and creation speeds over 5,000 per second.
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2. DeepSeek and Moonshot will join OpenAI and Anthropic in briefing the UN Security Council on AI risks on September 23, Reuters reports, with the leaders in New York for the UN General Assembly. DeepSeek founder Liang Wenfeng is not expected to attend, and plans could still change.
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3. Luo Fuli says Xiaomi's new model shows more innovation than DeepSeek's R1, and the training run cost RMB 23 million (~$3.2 million) over six days. No benchmarks or architecture details accompanied the claim.
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4. DeepSeek is training a new model of roughly 2 trillion parameters, and Liang Wenfeng told investors the next step is 8 trillion. That is five times the 1.6 trillion total and 49 billion activated parameters DeepSeek disclosed for V4-Pro in April.
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DSec, the UN briefing, and the 8-trillion-parameter plan all point to the same shift: DeepSeek's efficiency story now includes the systems around the model alongside the model weights. The Xiaomi training-cost claim lands differently in that context, because the open question is whether those systems can keep larger scale economical.
DeepSeek is training a new model of roughly 2 trillion parameters, and Liang Wenfeng told investors the next step is 8 trillion. That is five times the 1.6T total and 49B activated parameters DeepSeek disclosed for V4-Pro in April. For a lab known for doing more with less, this is a real turn.
When DeepSeek released V3 in late 2024, it put the training bill on the table: 671B total parameters, 37B activated per token, 2.788 million H800 GPU hours, and a stated cost of $5.576 million at $2 per GPU hour. That number, not parameter count, became its label. The constraint was structural: no abundant advanced GPU supply, and funding from Liang's own quant firm High-Flyer rather than outside investors.
The constraint has loosened. DeepSeek closed its first external round in June, raising about $7.4 billion, and a second round of roughly RMB 50 billion (~$7.5 billion) at a valuation of about RMB 500 billion (~$69B) is in final negotiations. It has engaged CITIC Securities to prepare a STAR Market listing, and on September 21 Yan Wentao, formerly a partner at Gaorong Ventures, joined as CFO, filling a seat that had been empty for three years.
Our read: the 8T plan is not a reversal of the efficiency thesis so much as its consequence. Under MoE, total parameters and per-token compute are separate numbers, so a bigger model does not mean a proportionally bigger bill. Kimi K3 carries 2.8T total parameters but activates 104B per token, about 3.7%; V4-Pro activates about 3%. Efficiency gains buy capacity rather than replace it, and agent workloads, which chain search, code, tools and sub-agents into long tasks, reward breadth of capability over peak benchmark scores.