Mercury 3 vs o1-pro
Mercury 3 leads the LLM Stats Score 36.1 to 19.3.
Inception · OpenAI · Updated for 2026
Which is better?
Mercury 3 leads the overall LLM Stats Score 36.1 to 19.3, ranking #98 overall.
In the 1 individual benchmarks reported for both models, Mercury 3 wins 1; this is a narrower head-to-head signal than the composite indexes.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Mercury 3
- overall performance matters — it scores 36.1 and ranks #98 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- you want the most recent training data — it shipped Oct 2026
Choose o1-pro
- you are already invested in the OpenAI ecosystem
At a glance
The differences that matter most.
Individual benchmarks
12 reported for Mercury 3 · 2 for o1-pro
Mercury 3 outperforms in 1 benchmarks (GPQA), while o1-pro is better at 0 benchmarks.
Mercury 3 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Only Mercury 3 specifies input context (1,000,000 tokens). Only Mercury 3 specifies output context (131,072 tokens).
Input capabilities
Documented input modalities across available providers
o1-pro supports multimodal inputs, whereas Mercury 3 does not.
o1-pro can handle both text and other forms of data like images, making it suitable for multimodal applications.
Mercury 3
o1-pro
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
Mercury 3 was released on 2026-10-19, while o1-pro was released on 2024-12-17.
Mercury 3 is 22 months newer than o1-pro.
Oct 19, 2026
0 days ago
1.8yr newerDec 17, 2024
1.8 years ago
Knowledge Cutoff
When training data ends
o1-pro has a documented knowledge cutoff of 2023-09-30, while Mercury 3's cutoff date is not specified.
We can confirm o1-pro's training data extends to 2023-09-30, but cannot make a direct comparison without Mercury 3's cutoff date.
—
Sep 2023
Outputs Comparison
Judge for yourself.
Run your own prompts against Mercury 3 and o1-pro side-by-side, then vote on the output you prefer.
FAQ
Common questions about Mercury 3 vs o1-pro.