Model Comparison
Gemini 2.5 Pro Preview 06-05 vs GPT-5.1 MediumWhich is better in 2026?
GPT-5.1 Medium significantly outperforms across most benchmarks. Gemini 2.5 Pro Preview 06-05 and GPT-5.1 Medium cost the same.
Verdict: Gemini 2.5 Pro Preview 06-05 vs GPT-5.1 Medium — which is better?
Gemini 2.5 Pro Preview 06-05 (by Google) and GPT-5.1 Medium (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.
Gemini 2.5 Pro Preview 06-05 outperforms in 0 benchmarks, while GPT-5.1 Medium is better at 1 benchmark (AIME 2025). GPT-5.1 Medium significantly outperforms across most benchmarks.
Gemini 2.5 Pro Preview 06-05 also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.
Choose Gemini 2.5 Pro Preview 06-05 if…
- you process long inputs — it offers a 1,048,576 token context window
Choose GPT-5.1 Medium if…
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
- you want the most recent training data — it shipped Nov 2025
Performance Benchmarks
Comparative analysis across standard metrics
Gemini 2.5 Pro Preview 06-05 outperforms in 0 benchmarks, while GPT-5.1 Medium is better at 1 benchmark (AIME 2025).
GPT-5.1 Medium significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Gemini 2.5 Pro Preview 06-05 ($1.25/1M tokens) costs the same as GPT-5.1 Medium ($1.25/1M tokens).
For output processing, Gemini 2.5 Pro Preview 06-05 ($10.00/1M tokens) costs the same as GPT-5.1 Medium ($10.00/1M tokens).
In conclusion, Gemini 2.5 Pro Preview 06-05 and GPT-5.1 Medium cost the same.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Gemini 2.5 Pro Preview 06-05 accepts 1,048,576 input tokens compared to GPT-5.1 Medium's 400,000 tokens. GPT-5.1 Medium can generate longer responses up to 128,000 tokens, while Gemini 2.5 Pro Preview 06-05 is limited to 65,535 tokens.
Input Capabilities
Supported data types and modalities
Both Gemini 2.5 Pro Preview 06-05 and GPT-5.1 Medium support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Gemini 2.5 Pro Preview 06-05
GPT-5.1 Medium
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Gemini 2.5 Pro Preview 06-05 was released on 2025-06-05, while GPT-5.1 Medium was released on 2025-11-12.
GPT-5.1 Medium is 5 months newer than Gemini 2.5 Pro Preview 06-05.
Jun 5, 2025
1.0 years ago
Nov 12, 2025
6 months ago
5mo newerKnowledge Cutoff
When training data ends
Gemini 2.5 Pro Preview 06-05 has a documented knowledge cutoff of 2025-01-31, while GPT-5.1 Medium's cutoff date is not specified.
We can confirm Gemini 2.5 Pro Preview 06-05's training data extends to 2025-01-31, but cannot make a direct comparison without GPT-5.1 Medium's cutoff date.
Jan 2025
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Provider Availability
Gemini 2.5 Pro Preview 06-05 is available from Google. GPT-5.1 Medium is available from OpenAI.
Gemini 2.5 Pro Preview 06-05
GPT-5.1 Medium
Outputs Comparison
Key Takeaways
Detailed Comparison
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FAQ
Common questions about Gemini 2.5 Pro Preview 06-05 vs GPT-5.1 Medium.