Model Comparison

Gemini 3.1 Pro vs GPT-5.5

GPT-5.5 significantly outperforms across most benchmarks. Gemini 3.1 Pro is 2.0x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

9 benchmarks

Gemini 3.1 Pro outperforms in 2 benchmarks (BrowseComp, GPQA), while GPT-5.5 is better at 7 benchmarks (ARC-AGI v2, Humanity's Last Exam, MCP Atlas, MMMU-Pro, MRCR v2 (8-needle), SWE-Bench Pro, Terminal-Bench 2.0).

GPT-5.5 significantly outperforms across most benchmarks.

Wed May 13 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 3.1 Pro costs less

For input processing, Gemini 3.1 Pro ($2.50/1M tokens) is 2.0x cheaper than GPT-5.5 ($5.00/1M tokens).

For output processing, Gemini 3.1 Pro ($15.00/1M tokens) is 2.0x cheaper than GPT-5.5 ($30.00/1M tokens).

In conclusion, GPT-5.5 is more expensive than Gemini 3.1 Pro.*

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

Lowest available price from all providers

Wed May 13 2026 • llm-stats.com

Gemini 3.1 Pro

Input tokens$2.50

Output tokens$15.00

Best providerGoogle

GPT-5.5

Input tokens$5.00

Output tokens$30.00

Best providerOpenAI

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Context Window

Maximum input and output token capacity

GPT-5.5 accepts 1,050,000 input tokens compared to Gemini 3.1 Pro's 1,048,576 tokens. GPT-5.5 can generate longer responses up to 128,000 tokens, while Gemini 3.1 Pro is limited to 65,536 tokens.

Gemini 3.1 Pro

Input1,048,576 tokens

Output65,536 tokens

GPT-5.5

Input1,050,000 tokens

Output128,000 tokens

Wed May 13 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3.1 Pro and GPT-5.5 support multimodal inputs.

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

Gemini 3.1 Pro

Text

Images

Audio

Video

GPT-5.5

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 3.1 Pro

Proprietary

Closed source

GPT-5.5

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.1 Pro was released on 2026-02-19, while GPT-5.5 was released on 2026-04-23.

GPT-5.5 is 2 months newer than Gemini 3.1 Pro.

Gemini 3.1 Pro

Feb 19, 2026

2 months ago

GPT-5.5

Apr 23, 2026

2 weeks ago

2mo newer

Knowledge Cutoff

When training data ends

Gemini 3.1 Pro has a knowledge cutoff of 2025-01-31, while GPT-5.5 has a cutoff of 2025-12-01.

GPT-5.5 has more recent training data (up to 2025-12-01), making it potentially better informed about events through that date compared to Gemini 3.1 Pro (2025-01-31).

Gemini 3.1 Pro

Jan 2025

GPT-5.5

Dec 2025

11 mo newer

Provider Availability

Gemini 3.1 Pro is available from Google. GPT-5.5 is available from OpenAI.

Gemini 3.1 Pro

Google

Input Price:Input: $2.50/1MOutput Price:Output: $15.00/1M

GPT-5.5

OpenAI

Input Price:Input: $5.00/1MOutput Price:Output: $30.00/1M

* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Gemini 3.1 Pro

View details

Google

Less expensive input tokens

Less expensive output tokens

Higher BrowseComp score (85.9% vs 84.4%)

Higher GPQA score (94.3% vs 93.6%)

GPT-5.5

View details

OpenAI

Larger context window (1,050,000 tokens)

Higher ARC-AGI v2 score (85.0% vs 77.1%)

Higher Humanity's Last Exam score (52.2% vs 51.4%)

Higher MCP Atlas score (75.3% vs 69.2%)

Higher MMMU-Pro score (83.2% vs 80.5%)

Higher MRCR v2 (8-needle) score (74.0% vs 26.3%)

Higher SWE-Bench Pro score (58.6% vs 54.2%)

Higher Terminal-Bench 2.0 score (82.7% vs 68.5%)

Detailed Comparison

AI Model Comparison Table
Feature	Gemini 3.1 Pro	GPT-5.5

FAQ

Common questions about Gemini 3.1 Pro vs GPT-5.5.

Which is better, Gemini 3.1 Pro or GPT-5.5?

GPT-5.5 significantly outperforms across most benchmarks. Gemini 3.1 Pro is made by Google and GPT-5.5 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 3.1 Pro compare to GPT-5.5 in benchmarks?

Gemini 3.1 Pro scores t2-bench: 99.3%, LiveCodeBench Pro: 96.2%, GPQA: 94.3%, MMMLU: 92.6%, BrowseComp: 85.9%. GPT-5.5 scores Tau2 Telecom: 98.0%, ARC-AGI: 95.0%, GPQA: 93.6%, ARC-AGI v2: 85.0%, GDPval-MM: 84.9%.

Is Gemini 3.1 Pro cheaper than GPT-5.5?

Gemini 3.1 Pro is 2.0x cheaper for input tokens. Gemini 3.1 Pro costs $2.50/M input and $15.00/M output via google. GPT-5.5 costs $5.00/M input and $30.00/M output via openai.

What are the context window sizes for Gemini 3.1 Pro and GPT-5.5?

Gemini 3.1 Pro supports 1.0M tokens and GPT-5.5 supports 1.1M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 3.1 Pro and GPT-5.5?

Key differences include context window (1.0M vs 1.1M), input pricing ($2.50 vs $5.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 3.1 Pro and GPT-5.5?

Gemini 3.1 Pro is developed by Google and GPT-5.5 is developed by OpenAI.