Weekly briefing for founders & operators who build with AI agents
~3 min read
The infrastructure layer just got a lot more serious. If you're still treating AI agents as prototypes, this week's moves suggest the enterprise tier disagrees.
Legora, a Swedish legal AI startup, went from 250 to 400+ law firm customers in under six months and is now eyeing a $400M raise at a $5โ6B valuation โ up from $1.8B. That's a 3x valuation jump in five months, serving 40+ markets. Vertical AI agents with real workflow lock-in are compressing the timeline from MVP to unicorn. Take note of the playbook: deep domain, real workflow replacement, not chat.
OpenAI and AWS co-launched a Stateful Runtime Environment on Amazon Bedrock with persistent context and memory across multi-step workflows. AWS is now the exclusive third-party cloud distributor for OpenAI Frontier enterprise agents. If you're running multi-step enterprise workflows on stateless infrastructure, the migration path is live. Start with one high-latency workflow (e.g. contract review, data pipeline monitoring), port it to Bedrock, and benchmark context retention across sessions. AgentCore Policy (GA as of March 3) gives you Cedar-based natural-language access controls โ use it to scope agent permissions by role from day one.
OpenAI's Codex Security Agent is in research preview. In testing it scanned 1.2M commits, surfaced 792 critical findings, cut false positives by 50%+, and caught over-reported severity in 90%+ of cases. That last number matters: bloated severity reports kill triage velocity. If you're on Pro or Enterprise, you get the first month free. Deploy it on your main repo this week. Use the findings to benchmark against your current tool. If it outperforms on precision, swap it in as your primary AppSec pass.
Gemini 3.1 Pro now leads agent-specific benchmarks: 77.1% on ARC-AGI-2 (double its predecessor), 94.3% on GPQA-Diamond, 33.5% on APEX-Agents. At $2/M input tokens, it's cost-competitive for complex reasoning chains. Identify the two or three agent tasks in your stack where failures are highest โ multi-step research, code reasoning, domain Q&A โ and run a 50-call A/B test against your current model. Log accuracy and cost. If the delta holds, reroute those specific tasks to Gemini 3.1 Pro.
When building multi-agent orchestrators, add this system instruction to your router:
"Score this task on: (1) reasoning depth 1โ5, (2) domain specificity 1โ5, (3) tool use required Y/N. Route score 8+ to [Model A], tool use tasks to [Model B], all others to [Model C]."
Lets you apply benchmark data to routing decisions without hardcoding model names.
If this issue saved you an hour of research, forward it to one operator on your team โ they'll thank you.
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