Best LLMs for Tool Calling — Z.ai
The best Z.ai model for tool calling is GLM 5.2, completing 99.1% of Tau²-Bench's multi-turn tool-use tasks. GLM 4.7 Flash (98.8%) and GLM 5V Turbo (98.5%) round out the top three.
- 1
glm-5.2ReasoningToolsJSON51.1 intel · $0.760/M · 156 t/s99.1%τ²-Bench - 2glm-4.7-flashReasoningToolsJSON22.9 intel · $0.060/M · 43 t/s98.8%τ²-Bench
- 3glm-5v-turboReasoningToolsJSON+134.5 intel · $1.20/M · 203K ctx98.5%τ²-Bench
- 4glm-5-turboReasoningToolsJSON38.1 intel · $1.20/M · 203K ctx98.5%τ²-Bench
- 5glm-5ReasoningToolsJSON39.5 intel · $0.950/M · 205K ctx98.2%τ²-Bench
- 6glm-5.1ReasoningToolsJSON40.2 intel · $0.966/M · 205K ctx97.7%τ²-Bench
- 7glm-4.7ReasoningToolsJSON33.7 intel · $0.400/M · 496 t/s95.9%τ²-Bench
- 8glm-4.6ReasoningToolsJSON23.0 intel · $0.500/M · 39 t/s76.9%τ²-Bench
- 9glm-4.5-airReasoningTools16.5 intel · $0.130/M · 42 t/s46.5%τ²-Bench
- 10glm-4.5ReasoningToolsJSON19.5 intel · $0.600/M · 33 t/s43.0%τ²-Bench
- 11glm-4.6vReasoningToolsJSON+111.0 intel · $0.300/M · 33 t/s30.7%τ²-Bench
- 12glm-4.5vReasoningToolsJSON+17.0 intel · $0.600/M · 39 t/s19.6%τ²-Bench
How this is ranked
AI models ranked by Tau²-Bench — multi-turn conversations where the model has to call the right tools, in the right order, against a real API to complete a customer task. This measures whether function calling actually works under pressure, which is a different question from whether a model supports the parameter at all.
Frequently asked
Which Z.ai model is best at tool calling?
The best Z.ai model for tool calling is GLM 5.2, completing 99.1% of Tau²-Bench's multi-turn tool-use tasks. GLM 4.7 Flash (98.8%) and GLM 5V Turbo (98.5%) round out the top three.
What's a good alternative to GLM 5.2?
GLM 4.7 Flash (98.8%) is the closest alternative on this metric, followed by GLM 5V Turbo (98.5%). 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.