Gemini 2.5 Pro vs o3
Gemini 2.5 Pro and o3 are closely matched at 27.8 and 31.1 on the LLM Stats Score. Gemini 2.5 Pro is 1.0x cheaper per token.
Google · OpenAI · Updated for 2026
Which is better?
Gemini 2.5 Pro and o3 are closely matched on the overall LLM Stats Score at 27.8 and 31.1.
In the 8 individual benchmarks reported for both models, o3 wins 6; this is a narrower head-to-head signal than the composite indexes.
Gemini 2.5 Pro also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Gemini 2.5 Pro
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped May 2025
Choose o3
- you value its reported benchmark strengths — it wins 6 of 8 exact shared results
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
16 reported for Gemini 2.5 Pro · 22 for o3
Gemini 2.5 Pro outperforms in 2 benchmarks (AIME 2024, Humanity's Last Exam), while o3 is better at 6 benchmarks (Aider-Polyglot, AIME 2025, ARC-AGI v2, GPQA, MMMU, SWE-Bench Verified).
o3 shows notably better performance in the majority of benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Gemini 2.5 Pro ($1.25/1M tokens) is 1.6x cheaper than o3 ($2.00/1M tokens).
For output processing, Gemini 2.5 Pro ($10.00/1M tokens) is 1.3x more expensive than o3 ($8.00/1M tokens).
In conclusion, o3 is more expensive than Gemini 2.5 Pro.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Gemini 2.5 Pro accepts 1,000,000 input tokens compared to o3's 200,000 tokens. Gemini 2.5 Pro can generate longer responses up to 1,000,000 tokens, while o3 is limited to 100,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Gemini 2.5 Pro and o3 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Gemini 2.5 Pro
o3
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 was released on 2025-05-20, while o3 was released on 2025-04-16.
Gemini 2.5 Pro is 1 month newer than o3.
May 20, 2025
1.3 years ago
1mo newerApr 16, 2025
1.4 years ago
Knowledge Cutoff
When training data ends
Gemini 2.5 Pro has a knowledge cutoff of 2025-01-31, while o3 has a cutoff of 2024-05-31.
Gemini 2.5 Pro has more recent training data (up to 2025-01-31), making it potentially better informed about events through that date compared to o3 (2024-05-31).
Jan 2025
8 mo newerMay 2024
Provider Availability
Gemini 2.5 Pro is available from DeepInfra, Google. o3 is available from OpenAI.
Gemini 2.5 Pro
o3
Outputs Comparison
Judge for yourself.
Run your own prompts against Gemini 2.5 Pro and o3 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Gemini 2.5 Pro vs o3.