modelgrep

Google: Gemini 3.1 Pro Preview vs Z.ai: GLM 5.1

google logoGoogle: Gemini 3.1 Pro Previewgoogle/gemini-3.1-pro-previewVSz-ai logoZ.ai: GLM 5.1z-ai/glm-5.1

Google: Gemini 3.1 Pro Preview wins on more metrics (6 of 9), but the right pick depends on what you optimize for — see the breakdown below.

MetricGoogle: Gemini 3.1 Pro PreviewZ.ai: GLM 5.1
Intelligence Index46.5✓40.2
Coding Index68.8✓55.8
GPQA Diamond94%✓87%
Design Arena Elo1347✓—
Speed (tokens/sec)103✓101
Latency2.8s304ms✓
Input price /M$2.00$0.966✓
Output price /M$12.00$3.04✓
Context window1.0M✓203K
CapabilitiesReasoningToolsJSONVisionAudioReasoningToolsJSON
Google: Gemini 3.1 Pro Preview details →Z.ai: GLM 5.1 details →