Gemini 3 Pro vs GPT-5.2 Codex Comparison

Comparing Gemini 3 Pro and GPT-5.2 Codex across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Gemini 3 Pro outperforms in 0 benchmarks, while GPT-5.2 Codex is better at 1 benchmark (Terminal-Bench 2.0).

GPT-5.2 Codex significantly outperforms across most benchmarks.

Tue Mar 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 3 Pro costs less

For input processing, Gemini 3 Pro ($2.00/1M tokens) is 1.1x more expensive than GPT-5.2 Codex ($1.75/1M tokens).

For output processing, Gemini 3 Pro ($12.00/1M tokens) is 1.2x cheaper than GPT-5.2 Codex ($14.00/1M tokens).

In conclusion, GPT-5.2 Codex is more expensive than Gemini 3 Pro.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers

Tue Mar 17 2026 • llm-stats.com

Gemini 3 Pro

Input tokens$2.00

Output tokens$12.00

Best providerGoogle

GPT-5.2 Codex

Input tokens$1.75

Output tokens$14.00

Best providerOpenAI

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Context Window

Maximum input and output token capacity

Gemini 3 Pro accepts 1,048,576 input tokens compared to GPT-5.2 Codex's 400,000 tokens. GPT-5.2 Codex can generate longer responses up to 128,000 tokens, while Gemini 3 Pro is limited to 65,536 tokens.

Gemini 3 Pro

Input1,048,576 tokens

Output65,536 tokens

GPT-5.2 Codex

Input400,000 tokens

Output128,000 tokens

Tue Mar 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3 Pro and GPT-5.2 Codex support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Gemini 3 Pro

Text

Images

Audio

Video

GPT-5.2 Codex

Text

Images

Audio

Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Gemini 3 Pro

Proprietary

Closed source

GPT-5.2 Codex

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3 Pro was released on 2025-11-18, while GPT-5.2 Codex was released on 2026-01-14.

GPT-5.2 Codex is 2 months newer than Gemini 3 Pro.

Gemini 3 Pro

Nov 18, 2025

3 months ago

GPT-5.2 Codex

Jan 14, 2026

2 months ago

1mo newer

Knowledge Cutoff

When training data ends

Gemini 3 Pro has a documented knowledge cutoff of 2025-01-31, while GPT-5.2 Codex's cutoff date is not specified.

We can confirm Gemini 3 Pro's training data extends to 2025-01-31, but cannot make a direct comparison without GPT-5.2 Codex's cutoff date.

Gemini 3 Pro

Jan 2025

GPT-5.2 Codex

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Provider Availability

Gemini 3 Pro is available from Google. GPT-5.2 Codex is available from OpenAI. The availability of providers can affect quality of the model and reliability.