Gemini 3 Pro vs GPT-5.1 Comparison

Comparing Gemini 3 Pro and GPT-5.1 across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Gemini 3 Pro outperforms in 2 benchmarks (AIME 2025, GPQA), while GPT-5.1 is better at 1 benchmark (SWE-Bench Verified).

Gemini 3 Pro shows notably better performance in the majority of benchmarks.

Mon Mar 16 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5.1 costs less

For input processing, Gemini 3 Pro ($2.00/1M tokens) is 1.6x more expensive than GPT-5.1 ($1.25/1M tokens).

For output processing, Gemini 3 Pro ($12.00/1M tokens) is 1.2x more expensive than GPT-5.1 ($10.00/1M tokens).

In conclusion, Gemini 3 Pro is more expensive than GPT-5.1.*

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

Lowest available price from all providers

Mon Mar 16 2026 • llm-stats.com

Gemini 3 Pro

Input tokens$2.00

Output tokens$12.00

Best providerGoogle

GPT-5.1

Input tokens$1.25

Output tokens$10.00

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-5.1's 400,000 tokens. GPT-5.1 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-5.1

Input400,000 tokens

Output128,000 tokens

Mon Mar 16 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3 Pro and GPT-5.1 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-5.1

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-5.1

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3 Pro was released on 2025-11-18, while GPT-5.1 was released on 2025-11-13.

Gemini 3 Pro is 0 month newer than GPT-5.1.

Gemini 3 Pro

Nov 18, 2025

3 months ago

5d newer

GPT-5.1

Nov 13, 2025

4 months ago

Knowledge Cutoff

When training data ends

Gemini 3 Pro has a knowledge cutoff of 2025-01-31, while GPT-5.1 has a cutoff of 2024-09-30.

Gemini 3 Pro has more recent training data (up to 2025-01-31), making it potentially better informed about events through that date compared to GPT-5.1 (2024-09-30).

Gemini 3 Pro

Jan 2025

4 mo newer

GPT-5.1

Sep 2024

Provider Availability

Gemini 3 Pro is available from Google. GPT-5.1 is available from OpenAI. The availability of providers can affect quality of the model and reliability.