Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows. Building on the multimodal foundation.…
Model details →Google: Gemini 3.1 Pro Preview vs OpenAI: GPT-5.3-Codex
Google: Gemini 3.1 Pro Preview wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-a…
Model details →Side-by-side comparison
| Capability | Google: Gemini 3.1 Pro Preview | OpenAI: GPT-5.3-Codex | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1.0M | 400K | 🏆 Google: Gemini 3.1 Pro Preview |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $2.00 | $1.75 | 🏆 OpenAI: GPT-5.3-Codex |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $12.00 | $14.00 | 🏆 Google: Gemini 3.1 Pro Preview |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Google: Gemini 3.1 Pro Preview better than OpenAI: GPT-5.3-Codex?
Google: Gemini 3.1 Pro Preview wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Google: Gemini 3.1 Pro Preview and OpenAI: GPT-5.3-Codex?
Input: $2.00 vs $1.75 per 1M tokens. Output: $12.00 vs $14.00 per 1M tokens.
What context windows do Google: Gemini 3.1 Pro Preview and OpenAI: GPT-5.3-Codex support?
Google: Gemini 3.1 Pro Preview supports up to 1.0M tokens. OpenAI: GPT-5.3-Codex supports up to 400K tokens.
Do both Google: Gemini 3.1 Pro Preview and OpenAI: GPT-5.3-Codex support tool calling?
Google: Gemini 3.1 Pro Preview: yes. OpenAI: GPT-5.3-Codex: yes.