Define the data boundary
Separate retention promises, safety processing, and the controls your application still owns.
Read guide →MODEL NOTES & AGENT SYSTEMS
AI systems you can evaluate
Source-aware notes on coding agents, evaluation, security boundaries, and provider changes—written for builders who need operational decisions, not model hype.
Browse all articles ↗START HERE
From AI claims to a system you can evaluate
Start with data boundaries, understand the runtime, then build an evaluation and a provider exit plan.
Measure finished work
Build a task set and rubric that measure correctness, safety, cost, and variance.
Read guide →Prepare for provider change
Turn a platform change into concrete portability, fallback, and migration checks.
Read guide →THE LIBRARY
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OpenAI Plans to End Cursor Model Access: What Developers Should Prepare Before November 12
OpenAI says it intends to wind down its Cursor model contract after SpaceX acquired the coding-tool company. Here is what is confirmed, what remains uncertain, and how teams can reduce model-provider lock-in now.
Tencent Hy4 Preview Explained: What 770B and a 1M Context Window Actually Change
Tencent has released and open-sourced Hy4 preview. Here is what the official release says about its 770B/49B MoE design, one-million-token context, access, pricing, and the evidence developers should still verify.
OpenAI’s Private Safety Processing: What Zero Data Retention Changes for Builders
OpenAI is previewing a safety layer for Zero Data Retention deployments. Here is what the announcement says, what it does not promise, and what teams should verify before relying on it.
Build a Repeatable LLM Agent Evaluation Before You Pick a Model
A practical evaluation design for comparing coding and tool-using models on the work your product actually needs.
Claude Text Watermarking Explained: Detection, Limits, and What It Means for Writers
Anthropic says future Claude models will use invisible statistical watermarks. The useful question is not whether a detector can label every paragraph, but what the signal can and cannot establish.