If 2024 was about talking to LLMs, re:Invent 2025 was about letting them actually do the work. Here is the comprehensive breakdown of the most significant announcements.

1. The Amazon Nova 2 Model Family

AWS didn't just update their models; they built a specialized fleet for different agentic roles:

  • Nova 2 Lite: Optimized for speed and cost. Equal or better than Gemini Flash 2.5 on 14/18 benchmarks.
  • Nova 2 Pro: The "Reasoning" heavy-lifter. Best for complex multi-step tasks and long-range planning.
  • Nova 2 Sonic: A speech-to-speech model for low-latency conversational AI.
  • Nova 2 Omni: The true multimodal star. It processes text, images, video, and speech simultaneously with a 1M token context window.
  • Nova Act: Generally Available and purpose-built for UI automation (browser-based tasks) with >90% reliability.

2. Custom Silicon: Graviton5 & Trainium3

The hardware story was about decoupling performance from cost:

  • Graviton5: 25% faster than Graviton4, with 192 cores and a 5x larger L3 cache. It introduces the Nitro Isolation Engine, using formal verification to provide mathematical proof of workload isolation.
  • Trainium3 & Trainium4: AWS announced Trn3 UltraServers and teased Trainium4, focusing on doubling the density of AI compute.

3. Frontier Agents: Your New Virtual Team

AWS launched three specialized "Frontier Agents" that work autonomously for days:

  • Kiro: An autonomous developer that learns your codebase and handles features from end-to-end.
  • AWS Security Agent: A 24/7 proactive security consultant that performs design reviews and automated penetration testing.
  • AWS DevOps Agent: An "Autonomous SRE" that resolves incidents and monitors application resilience proactively.

4. Infrastructure & Database Wins

  • Database Savings Plans: One flexible commitment for RDS, Aurora, DynamoDB, and more.
  • P6e-GB300 UltraServers: Generally Available, offering 1.5x GPU memory and FP4 compute for the heaviest inference tasks.
  • S3 Batch Operations: Now 10x faster, making massive data migrations nearly instantaneous.