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Google: Gemini 3.1 Pro Preview vs OpenAI: GPT-5.6 Terra

google logoGoogle: Gemini 3.1 Pro Previewgoogle/gemini-3.1-pro-previewVSopenai logoOpenAI: GPT-5.6 Terraopenai/gpt-5.6-terra

Google: Gemini 3.1 Pro Preview wins on more metrics (5 of 9), but the right pick depends on what you optimize for — see the breakdown below.

MetricGoogle: Gemini 3.1 Pro PreviewOpenAI: GPT-5.6 Terra
Intelligence Index46.555.0✓
Coding Index68.876.7✓
GPQA Diamond94%✓93%
Design Arena Elo1347✓—
Speed (tokens/sec)100✓87
Latency2.8s1.7s✓
Input price /M$2.00✓$2.50
Output price /M$12.00✓$15.00
Context window1.0M1.1M✓
CapabilitiesReasoningToolsJSONVisionAudioReasoningToolsJSONVision
Google: Gemini 3.1 Pro Preview details →OpenAI: GPT-5.6 Terra details →