The speed of model releases, in my view, is actually getting faster and faster. There were nearly nine months between GPT-3.5 and GPT-4. And now in just over one month, major models already included Claude Fable 5, Claude Sonnet 5, the GPT-5.6 series, Kimi K3, GLM 5.2, Qwen 3.8 Max, Grok 4.5... and the official DeepSeek V4 release is coming soon.
Iteration speed is now measured in days.