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Google: Gemini 3.1 Pro Preview vs OpenAI: GPT-5.3-Codex

google logoGoogle: Gemini 3.1 Pro Previewgoogle/gemini-3.1-pro-previewVSopenai logoOpenAI: GPT-5.3-Codexopenai/gpt-5.3-codex

Google: Gemini 3.1 Pro Preview wins on more metrics (7 of 9), but the right pick depends on what you optimize for — see the breakdown below.

MetricGoogle: Gemini 3.1 Pro PreviewOpenAI: GPT-5.3-Codex
Intelligence Index46.5✓44.3
Coding Index68.8✓—
GPQA Diamond94%✓92%
Design Arena Elo1347✓1206
Speed (tokens/sec)106✓61
Latency2.9s2.3s✓
Input price /M$2.00$1.75✓
Output price /M$12.00✓$14.00
Context window1.0M✓400K
CapabilitiesReasoningToolsJSONVisionAudioReasoningToolsJSONVision
Google: Gemini 3.1 Pro Preview details →OpenAI: GPT-5.3-Codex details →