Best LLMs for Instruction Following — Z.ai
The best Z.ai model for instruction following is GLM 5.1, satisfying 76.3% of IFBench's verifiable prompt constraints. GLM 5.2 (73.3%) and GLM 5 Turbo (73.2%) round out the top three.
- 1
glm-5.1ReasoningToolsJSON40.2 intel · $0.966/M · 205K ctx76.3%IFBench - 2glm-5.2ReasoningToolsJSON51.1 intel · $0.760/M · 160 t/s73.3%IFBench
- 3glm-5-turboReasoningToolsJSON38.1 intel · $1.20/M · 203K ctx73.2%IFBench
- 4glm-5ReasoningToolsJSON39.5 intel · $0.950/M · 205K ctx72.3%IFBench
- 5glm-4.7ReasoningToolsJSON33.7 intel · $0.400/M · 205K ctx67.9%IFBench
- 6glm-5v-turboReasoningToolsJSON+134.5 intel · $1.20/M · 203K ctx61.1%IFBench
- 7glm-4.7-flashReasoningToolsJSON22.9 intel · $0.060/M · 203K ctx60.8%IFBench
- 8glm-4.5ReasoningToolsJSON19.5 intel · $0.600/M · 33 t/s44.1%IFBench
- 9glm-4.5-airReasoningTools16.5 intel · $0.130/M · 42 t/s37.6%IFBench
- 10glm-4.6ReasoningToolsJSON23.0 intel · $0.500/M · 39 t/s36.7%IFBench
- 11glm-4.5vReasoningToolsJSON+17.0 intel · $0.600/M · 39 t/s28.6%IFBench
- 12glm-4.6vReasoningToolsJSON+111.0 intel · $0.300/M · 131K ctx27.9%IFBench
How this is ranked
AI models ranked by IFBench — how reliably a model obeys explicit, verifiable constraints in the prompt (format, length, inclusion and exclusion rules). High scores mean fewer retries and less prompt-wrangling in production, which often matters more than raw intelligence for pipelines.
Frequently asked
Which Z.ai model follows instructions most reliably?
The best Z.ai model for instruction following is GLM 5.1, satisfying 76.3% of IFBench's verifiable prompt constraints. GLM 5.2 (73.3%) and GLM 5 Turbo (73.2%) round out the top three.
What's a good alternative to GLM 5.1?
GLM 5.2 (73.3%) is the closest alternative on this metric, followed by GLM 5 Turbo (73.2%). See the full ranking above for the tradeoffs.
How many Z.ai models are there?
modelgrep tracks 12 Z.ai models with live benchmarks, speed, latency and per-provider pricing, led on intelligence by GLM 5.2. 12 of them qualify for this ranking.