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

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

OpenAI: GPT-5.6 Luna 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 PreviewOpenAI: GPT-5.6 Luna
Intelligence Index46.551.2✓
Coding Index68.871.4✓
GPQA Diamond94%✓91%
Design Arena Elo1347✓—
Speed (tokens/sec)100✓60
Latency2.8s1.7s✓
Input price /M$2.00$1.00✓
Output price /M$12.00$6.00✓
Context window1.0M1.1M✓
CapabilitiesReasoningToolsJSONVisionAudioReasoningToolsJSONVision
Google: Gemini 3.1 Pro Preview details →OpenAI: GPT-5.6 Luna details →