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Katelyn Lesse and Angela Jiang join Latent Space to explain the engineering behind the Claude Platform: launching Opus 5.5, separating the model’s “brain” from the agent’s “hands,” scaling APIs, and building reliable managed agents. A new introduction covers Anthropic’s S-1, the improvement and investment loops, and why the platform matters. Watch the full episode on YouTube Show notes - Claude Opus 5.5 — Anthropic’s launch notes on model behavior, evaluation and pricing. - Scaling Managed Agents — Decoupling the brain, harness and sandbox. - How Anthropic contains Claude — Isolation, credentials and network controls. - Effective harnesses for long-running agents — Maintaining progress across context windows. - Our Anthropic S-1 breakdown — Context for the newly recorded introduction. Timestamps 0:00 Anthropic’s S-1 and this interview 1:06 Revenue per employee and efficiency 3:13 The improvement and investment loops 4:04 Why Claude Platform matters 6:25 Training incidents and production safeguards 7:30 Opus 5.5 launch and pricing 9:25 Distillation and preserved thinking 14:35 Product and engineering at Anthropic 18:05 Scaling the Claude Platform 19:25 Model access and safety decisions 26:25 Trust grants and product roadmaps 30:25 How Anthropic launches models 35:55 Benchmarks and model personalization 42:10 Claude Managed Agents 44:25 Memory, dreaming, and agent harnesses 48:25 Evaluating agents 53:25 CPU constraints and scaling 56:05 Rebuilding the Messages API in Rust 1:03:25 The brain and the hands 1:05:25 Protecting credentials and sandboxes 1:08:25 Training incidents versus production 1:10:55 Pacing and launching frontier models 1:12:25 Safety classifiers and model routing 1:19:25 Emerging agent workloads 1:20:55 Fighting AI slop 1:27:25 Management, writing, and working styles 1:33:25 Building Anthropic’s DevRel team 1:40:25 Developer relations and product voices 1:43:25 What to try with Opus 5.5
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