Claude Opus 4.5 vs o1-pro
Claude Opus 4.5 leads the LLM Stats Score 38.3 to 19.9.
Anthropic · OpenAI · Updated for 2026
Which is better?
Claude Opus 4.5 leads the overall LLM Stats Score 38.3 to 19.9, ranking #63 overall.
In the 1 individual benchmarks reported for both models, Claude Opus 4.5 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 Claude Opus 4.5
- overall performance matters — it scores 38.3 and ranks #63 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 Nov 2025
Choose o1-pro
- you are already invested in the OpenAI ecosystem
At a glance
The differences that matter most.
Individual benchmarks
11 reported for Claude Opus 4.5 · 2 for o1-pro
Claude Opus 4.5 outperforms in 1 benchmarks (GPQA), while o1-pro is better at 0 benchmarks.
Claude Opus 4.5 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 Claude Opus 4.5 specifies input context (200,000 tokens). Only Claude Opus 4.5 specifies output context (64,000 tokens).
Input capabilities
Documented input modalities across available providers
Both Claude Opus 4.5 and o1-pro support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Opus 4.5
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
Claude Opus 4.5 was released on 2025-11-24, while o1-pro was released on 2024-12-17.
Claude Opus 4.5 is 11 months newer than o1-pro.
Nov 24, 2025
9 months ago
11mo newerDec 17, 2024
1.7 years ago
Knowledge Cutoff
When training data ends
Claude Opus 4.5 has a knowledge cutoff of 2025-03-31, while o1-pro has a cutoff of 2023-09-30.
Claude Opus 4.5 has more recent training data (up to 2025-03-31), making it potentially better informed about events through that date compared to o1-pro (2023-09-30).
Mar 2025
1.5 yr newerSep 2023
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Opus 4.5 and o1-pro side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Opus 4.5 vs o1-pro.