Model Comparison

Claude 3 Opus vs o3

o3 significantly outperforms across most benchmarks. o3 is 8.6x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude 3 Opus outperforms in 0 benchmarks, while o3 is better at 1 benchmark (GPQA).

o3 significantly outperforms across most benchmarks.

Fri May 29 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

o3 costs less

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

Lowest available price from all providers
Fri May 29 2026 • llm-stats.com
Anthropic
Claude 3 Opus
Input tokens$15.00
Output tokens$75.00
Best providerAnthropic
OpenAI
o3
Input tokens$2.00
Output tokens$8.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

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.

Anthropic
Claude 3 Opus
Input200,000 tokens
Output200,000 tokens
OpenAI
o3
Input200,000 tokens
Output100,000 tokens
Fri May 29 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

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

Text
Images
Audio
Video

o3

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude 3 Opus

Proprietary

Closed source

o3

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.

Claude 3 Opus

Feb 29, 2024

2.2 years ago

o3

Apr 16, 2025

1.1 years ago

1.1yr newer

Knowledge 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.

Claude 3 Opus

—

o3

May 2024

Provider Availability

Claude 3 Opus is available from Anthropic, Bedrock, Google. o3 is available from OpenAI.

Claude 3 Opus

anthropic logo
Anthropic
Input Price:Input: $15.00/1MOutput Price:Output: $75.00/1M
bedrock logo
AWS Bedrock
Input Price:Input: $15.00/1MOutput Price:Output: $75.00/1M
google logo
Google
Input Price:Input: $15.00/1MOutput Price:Output: $75.00/1M

o3

openai logo
OpenAI
Input Price:Input: $2.00/1MOutput Price:Output: $8.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic

No standout differentiators in the data we have for this pair.

OpenAI
Less expensive input tokens
Less expensive output tokens
Higher GPQA score (83.3% vs 50.4%)
AnthropicClaude 3 Opus
OpenAIo3
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Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude 3 Opus
OpenAI
o3

FAQ

Common questions about Claude 3 Opus vs o3.

Which is better, Claude 3 Opus or o3?

o3 significantly outperforms across most benchmarks. Claude 3 Opus is made by Anthropic and o3 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude 3 Opus compare to o3 in benchmarks?

Claude 3 Opus scores ARC-C: 96.4%, HellaSwag: 95.4%, GSM8k: 95.0%, MGSM: 90.7%, BIG-Bench Hard: 86.8%. o3 scores COLLIE: 98.4%, AIME 2024: 91.6%, ARC-AGI: 88.0%, MathVista: 86.8%, AIME 2025: 86.4%.

Is Claude 3 Opus cheaper than o3?

o3 is 7.5x cheaper for input tokens. Claude 3 Opus costs $15.00/M input and $75.00/M output via anthropic. o3 costs $2.00/M input and $8.00/M output via openai.

What are the context window sizes for Claude 3 Opus and o3?

Claude 3 Opus supports 200K tokens and o3 supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude 3 Opus and o3?

Key differences include input pricing ($15.00 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude 3 Opus and o3?

Claude 3 Opus is developed by Anthropic and o3 is developed by OpenAI.