Claude 3 Opus vs o3
o3 leads the LLM Stats Score 31.1 to 9.9. o3 is 8.6x cheaper per token.
Anthropic · OpenAI · Updated for 2026
Which is better?
o3 leads the overall LLM Stats Score 31.1 to 9.9, ranking #119 overall.
In the 1 individual benchmarks reported for both models, o3 wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, o3 is roughly 8.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude 3 Opus
- you want predictable pricing at $15.00/M input and $75.00/M output
Choose o3
- overall performance matters — it scores 31.1 and ranks #119 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
- cost matters — it's about 8.6x cheaper per token
- you want the most recent training data — it shipped Apr 2025
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
11 reported for Claude 3 Opus · 22 for o3
Claude 3 Opus outperforms in 0 benchmarks, while o3 is better at 1 benchmark (GPQA).
o3 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude 3 Opus ($15.00/1M tokens) is 7.5x more expensive than o3 ($2.00/1M tokens).
For output processing, Claude 3 Opus ($75.00/1M tokens) is 9.4x more expensive than o3 ($8.00/1M tokens).
In conclusion, Claude 3 Opus is more expensive than o3.*
* 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 200,000 tokens. Claude 3 Opus can generate longer responses up to 200,000 tokens, while o3 is limited to 100,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude 3 Opus and o3 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude 3 Opus
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
Claude 3 Opus was released on 2024-02-29, while o3 was released on 2025-04-16.
o3 is 14 months newer than Claude 3 Opus.
Feb 29, 2024
2.6 years ago
Apr 16, 2025
1.4 years ago
1.1yr newerKnowledge Cutoff
When training data ends
o3 has a documented knowledge cutoff of 2024-05-31, while Claude 3 Opus's cutoff date is not specified.
We can confirm o3's training data extends to 2024-05-31, but cannot make a direct comparison without Claude 3 Opus's cutoff date.
—
May 2024
Provider Availability
Claude 3 Opus is available from Anthropic, Bedrock, Google. o3 is available from OpenAI.
Claude 3 Opus
o3
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude 3 Opus and o3 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude 3 Opus vs o3.