Gemini 3 Pro is Google’s flagship frontier model for high-precision multimodal reasoning, combining strong performance across text, image, video, audio, and code with a 1M-token context window. Reasoning Details must be preserved when using…
Model details →Google: Gemini 3 Pro Preview vs OpenAI: GPT-5 Codex
OpenAI: GPT-5 Codex wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
GPT-5-Codex is a specialized version of GPT-5 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks. The model supports…
Model details →Side-by-side comparison
| Capability | Google: Gemini 3 Pro Preview | OpenAI: GPT-5 Codex | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1.0M | 400K | 🏆 Google: Gemini 3 Pro Preview |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $2.00 | $1.25 | 🏆 OpenAI: GPT-5 Codex |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $12.00 | $10.00 | 🏆 OpenAI: GPT-5 Codex |
| 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 Pro Preview better than OpenAI: GPT-5 Codex?
OpenAI: GPT-5 Codex 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 Pro Preview and OpenAI: GPT-5 Codex?
Input: $2.00 vs $1.25 per 1M tokens. Output: $12.00 vs $10.00 per 1M tokens.
What context windows do Google: Gemini 3 Pro Preview and OpenAI: GPT-5 Codex support?
Google: Gemini 3 Pro Preview supports up to 1.0M tokens. OpenAI: GPT-5 Codex supports up to 400K tokens.
Do both Google: Gemini 3 Pro Preview and OpenAI: GPT-5 Codex support tool calling?
Google: Gemini 3 Pro Preview: yes. OpenAI: GPT-5 Codex: yes.