Gemini 3.5 Flash: What It Really Changes for Agent Costs
Gemini 3.5 Flash matters for agentic and coding workflows mainly because of a cost mechanic that the headline pricing doesn’t communicate: in an agent loop, cache hit rate on your system prompt and tool definitions determines your real spend far more than the per-token rate does. Teams that budget off the advertised $1.50 input and […]
DeepSeek V4: What Engineering Teams Should Verify First
DeepSeek V4 matters to engineering teams less because of its benchmark scores and more because of two production realities that don’t show up on a pricing page: the model’s behavior has already changed multiple times under the same model name, and the benchmark numbers behind the excitement are self-reported and not yet independently verified. Both […]
What Is Amazon Bedrock? A Practical Engineering Guide
Amazon Bedrock is a managed AWS service that gives you a single API to call foundation models from multiple providers (Anthropic, Meta, Amazon’s own Nova family, Cohere, Mistral, and others) without running your own inference infrastructure. That description is accurate and also the least useful way to think about it if you are the person […]
RAG vs Fine-Tuning: How to Choose the Right Approach
Use RAG when the model’s problem is not knowing something. Use fine-tuning when the model’s problem is knowing something but not doing anything consistent with it. Most teams frame this as a single either-or decision, and that framing is the first mistake. RAG and fine-tuning fix different failure modes, and a production system with real […]
How to Choose an AI Model: A Practical Selection Framework
AI model selection should not start with a leaderboard. It should start with a small evaluation set built from your own production data, because public benchmark rank rarely predicts how a model performs on your specific task distribution, and the real cost of picking wrong shows up months later as a reliability problem, not as […]
Gemini 4 Pro Just Appeared in Disguise, and Its Early Tests Are Wild
Google may have finally shown its hand. Over the past few days, a mysterious model labeled gemini-3.8-flash quietly appeared in Arena. That name should not have caused much excitement: the real Gemini 3.8 Flash had already launched earlier in September. But once developers began testing the new Arena variant, it became obvious that something was different. […]