Resume tokens and last-event IDs for LLM streaming: How they work & what they cost to build

📰 Dev.to · Ably Blog

Learn how resume tokens and last-event IDs enable seamless LLM streaming, even when connections drop, and understand the costs of building this functionality

intermediate Published 13 Apr 2026
Action Steps
  1. Implement resume tokens to store the current token index
  2. Use last-event IDs to track the most recent event
  3. Configure your LLM streaming pipeline to handle connection drops
  4. Test your implementation with simulated connection drops
  5. Optimize your solution for performance and cost
Who Needs to Know This

Developers and engineers working with LLMs and real-time streaming can benefit from this knowledge to improve user experience and reduce errors

Key Insight

💡 Resume tokens and last-event IDs can help ensure seamless LLM streaming, even when connections drop

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🚀 Improve LLM streaming with resume tokens and last-event IDs! 💡
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