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Google: Gemini 3.5 Flash vs OpenAI: GPT-5.6 Terra

google logoGoogle: Gemini 3.5 Flashgoogle/gemini-3.5-flashVSopenai logoOpenAI: GPT-5.6 Terraopenai/gpt-5.6-terra

Google: Gemini 3.5 Flash wins on more metrics (5 of 9), but the right pick depends on what you optimize for — see the breakdown below.

MetricGoogle: Gemini 3.5 FlashOpenAI: GPT-5.6 Terra
Intelligence Index50.255.0✓
Coding Index70.176.7✓
GPQA Diamond92%93%✓
Design Arena Elo1313✓—
Speed (tokens/sec)168✓87
Latency1.0s✓1.7s
Input price /M$1.50✓$2.50
Output price /M$9.00✓$15.00
Context window1.0M1.1M✓
CapabilitiesReasoningToolsJSONVisionAudioReasoningToolsJSONVision
Google: Gemini 3.5 Flash details →OpenAI: GPT-5.6 Terra details →