For Ollama, the next step down from a 27B model is usually 12B. In a practical size ladder, that often means 27B → 12B → 4B → 1B, with 12B being the most common “one notch smaller” choice for a big drop in memory use while keeping decent capability.

What that means

  • 27B : best if you want higher quality and have the RAM/VRAM for it.
  • 12B : the typical next step down, and often the sweet spot for many local setups.
  • 4B : much lighter, faster, and easier to run on modest hardware.
  • 1B : ultra-light, but with a bigger quality tradeoff.

Practical pick

If you’re choosing based on hardware, 12B is the safest next move from 27B in Ollama, especially if you’re trying to fit a model on a consumer GPU or reduce CPU/RAM pressure. If you’re chasing speed over quality, go lower to 4B; if you want the closest experience to 27B without staying that large, start with 12B.

Example

If you’re currently running a 27B Gemma or Qwen-family model in Ollama, the next downsized option is usually the 12B variant of the same family, not a totally different model name.

TL;DR: 27B → 12B is the usual next step down in Ollama.