GPT-5.4 vs DeepSeek V4 vs GLM-4.7: How to choose the right model without testing each one If you are building with AI models right now, you are facing too many choices. OpenAI has GPT-5.4 and GPT-5.5. DeepSeek offers V4 Flash and V4 Pro. GLM has 4.7, 5, and 5.1. Kimi has K2.5. MiniMax has M2.5. Qwen has 3.5 Plus. Each provider claims their model is the best. But benchmarks do not tell you which model is right for your specific use case. I spent weeks testing these models across real workloads: code generation, technical writing, creative tasks, structured output, Chinese-language processing, and multi-step reasoning. Here is what I found, and how I decided which model to use for which task. The models I tested All tests were run through a single gateway (ChinaLLM) using the same OpenAI-compatible SDK. Same prompts, same temperature, same max tokens. The only variable was the model name.…