Model Comparison

Gemini 2.5 Pro vs GPT-5.1 Instant

GPT-5.1 Instant significantly outperforms across most benchmarks. Gemini 2.5 Pro and GPT-5.1 Instant cost the same.

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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Gemini 2.5 Pro outperforms in 0 benchmarks, while GPT-5.1 Instant is better at 4 benchmarks (AIME 2025, GPQA, MMMU, SWE-Bench Verified).

GPT-5.1 Instant significantly outperforms across most benchmarks.

Thu Apr 16 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5.1 Instant costs less

For input processing, Gemini 2.5 Pro ($1.25/1M tokens) costs the same as GPT-5.1 Instant ($1.25/1M tokens).

For output processing, Gemini 2.5 Pro ($10.00/1M tokens) costs the same as GPT-5.1 Instant ($10.00/1M tokens).

In conclusion, Gemini 2.5 Pro and GPT-5.1 Instant cost the same.*

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

Lowest available price from all providers
Thu Apr 16 2026 • llm-stats.com
Google
Gemini 2.5 Pro
Input tokens$1.25
Output tokens$10.00
Best providerGoogle
OpenAI
GPT-5.1 Instant
Input tokens$1.25
Output tokens$10.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 2.5 Pro accepts 1,048,576 input tokens compared to GPT-5.1 Instant's 400,000 tokens. GPT-5.1 Instant can generate longer responses up to 128,000 tokens, while Gemini 2.5 Pro is limited to 65,536 tokens.

Google
Gemini 2.5 Pro
Input1,048,576 tokens
Output65,536 tokens
OpenAI
GPT-5.1 Instant
Input400,000 tokens
Output128,000 tokens
Thu Apr 16 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 2.5 Pro and GPT-5.1 Instant support multimodal inputs.

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

Gemini 2.5 Pro

Text
Images
Audio
Video

GPT-5.1 Instant

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 2.5 Pro

Proprietary

Closed source

GPT-5.1 Instant

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 2.5 Pro was released on 2025-05-20, while GPT-5.1 Instant was released on 2025-11-12.

GPT-5.1 Instant is 6 months newer than Gemini 2.5 Pro.

Gemini 2.5 Pro

May 20, 2025

11 months ago

GPT-5.1 Instant

Nov 12, 2025

5 months ago

5mo newer

Knowledge Cutoff

When training data ends

Gemini 2.5 Pro has a documented knowledge cutoff of 2025-01-31, while GPT-5.1 Instant's cutoff date is not specified.

We can confirm Gemini 2.5 Pro's training data extends to 2025-01-31, but cannot make a direct comparison without GPT-5.1 Instant's cutoff date.

Gemini 2.5 Pro

Jan 2025

GPT-5.1 Instant

—

Provider Availability

Gemini 2.5 Pro is available from Google. GPT-5.1 Instant is available from OpenAI.

Gemini 2.5 Pro

google logo
Google
Input Price:Input: $1.25/1MOutput Price:Output: $10.00/1M

GPT-5.1 Instant

openai logo
OpenAI
Input Price:Input: $1.25/1MOutput Price:Output: $10.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Google
Larger context window (1,048,576 tokens)
OpenAI
Higher AIME 2025 score (94.0% vs 83.0%)
Higher GPQA score (88.1% vs 83.0%)
Higher MMMU score (85.4% vs 79.6%)
Higher SWE-Bench Verified score (76.3% vs 63.2%)
GoogleGemini 2.5 Pro
OpenAIGPT-5.1 Instant
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Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 2.5 Pro
OpenAI
GPT-5.1 Instant

FAQ

Common questions about Gemini 2.5 Pro vs GPT-5.1 Instant

GPT-5.1 Instant significantly outperforms across most benchmarks. Gemini 2.5 Pro is made by Google and GPT-5.1 Instant is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Gemini 2.5 Pro scores MRCR: 93.0%, AIME 2024: 92.0%, Global-MMLU-Lite: 88.6%, Video-MME: 84.8%, AIME 2025: 83.0%. GPT-5.1 Instant scores Tau2 Telecom: 95.6%, AIME 2025: 94.0%, BrowseComp Long Context 128k: 90.0%, GPQA: 88.1%, MMMU: 85.4%.
Both models cost $1.25 per million input tokens.
Gemini 2.5 Pro supports 1.0M tokens and GPT-5.1 Instant supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (1.0M vs 400K). See the full comparison above for benchmark-by-benchmark results.
Gemini 2.5 Pro is developed by Google and GPT-5.1 Instant is developed by OpenAI.