Model Comparison
Gemini 3.1 Pro vs Gemini 2.5 Pro Preview 06-05Which is better in 2026?
Gemini 3.1 Pro significantly outperforms across most benchmarks. Gemini 2.5 Pro Preview 06-05 is 1.6x cheaper per token.
Verdict: Gemini 3.1 Pro vs Gemini 2.5 Pro Preview 06-05 — which is better?
Gemini 3.1 Pro (by Google) and Gemini 2.5 Pro Preview 06-05 (by Google) 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 3.1 Pro outperforms in 4 benchmarks (GPQA, Humanity's Last Exam, MRCR v2 (8-needle), SWE-Bench Verified), while Gemini 2.5 Pro Preview 06-05 is better at 0 benchmarks. Gemini 3.1 Pro significantly outperforms across most benchmarks.
On price, Gemini 2.5 Pro Preview 06-05 is roughly 1.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Choose Gemini 3.1 Pro if…
- you want the strongest raw capability — it leads on 4 of 4 shared benchmarks
- you want the most recent training data — it shipped Feb 2026
Choose Gemini 2.5 Pro Preview 06-05 if…
- cost matters — it's about 1.6x cheaper per token
Performance Benchmarks
Comparative analysis across standard metrics
Gemini 3.1 Pro outperforms in 4 benchmarks (GPQA, Humanity's Last Exam, MRCR v2 (8-needle), SWE-Bench Verified), while Gemini 2.5 Pro Preview 06-05 is better at 0 benchmarks.
Gemini 3.1 Pro significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Gemini 3.1 Pro ($2.50/1M tokens) is 2.0x more expensive than Gemini 2.5 Pro Preview 06-05 ($1.25/1M tokens).
For output processing, Gemini 3.1 Pro ($15.00/1M tokens) is 1.5x more expensive than Gemini 2.5 Pro Preview 06-05 ($10.00/1M tokens).
In conclusion, Gemini 3.1 Pro is more expensive than Gemini 2.5 Pro Preview 06-05.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 1,048,576 tokens. Gemini 3.1 Pro can generate longer responses up to 65,536 tokens, while Gemini 2.5 Pro Preview 06-05 is limited to 65,535 tokens.
Input Capabilities
Supported data types and modalities
Both Gemini 3.1 Pro and Gemini 2.5 Pro Preview 06-05 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Gemini 3.1 Pro
Gemini 2.5 Pro Preview 06-05
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 3.1 Pro was released on 2026-02-19, while Gemini 2.5 Pro Preview 06-05 was released on 2025-06-05.
Gemini 3.1 Pro is 9 months newer than Gemini 2.5 Pro Preview 06-05.
Feb 19, 2026
3 months ago
8mo newerJun 5, 2025
1.0 years ago
Knowledge Cutoff
When training data ends
Both models have the same knowledge cutoff date of 2025-01-31.
They should have similar awareness of historical events and information up to this date.
Jan 2025
Jan 2025
Provider Availability
Gemini 3.1 Pro is available from Google. Gemini 2.5 Pro Preview 06-05 is available from Google.
Gemini 3.1 Pro
Gemini 2.5 Pro Preview 06-05
Outputs Comparison
Key Takeaways
Detailed Comparison
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FAQ
Common questions about Gemini 3.1 Pro vs Gemini 2.5 Pro Preview 06-05.