Model Comparison

Claude Opus 4.1 vs Claude Opus 4

Claude Opus 4.1 significantly outperforms across most benchmarks. Claude Opus 4.1 and Claude Opus 4 cost the same.

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Performance Benchmarks

Comparative analysis across standard metrics

8 benchmarks

Claude Opus 4.1 outperforms in 7 benchmarks (AIME 2025, GPQA, MMMLU, MMMU (validation), SWE-Bench Verified, TAU-bench Retail, Terminal-Bench), while Claude Opus 4 is better at 1 benchmark (TAU-bench Airline).

Claude Opus 4.1 significantly outperforms across most benchmarks.

Sun May 31 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

For input processing, Claude Opus 4.1 ($15.00/1M tokens) costs the same as Claude Opus 4 ($15.00/1M tokens).

For output processing, Claude Opus 4.1 ($75.00/1M tokens) costs the same as Claude Opus 4 ($75.00/1M tokens).

In conclusion, Claude Opus 4.1 and Claude Opus 4 cost the same.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Sun May 31 2026 • llm-stats.com
Anthropic
Claude Opus 4.1
Input tokens$15.00
Output tokens$75.00
Best providerAnthropic
Anthropic
Claude Opus 4
Input tokens$15.00
Output tokens$75.00
Best providerAnthropic
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. Both models can generate responses up to 32,000 tokens.

Anthropic
Claude Opus 4.1
Input200,000 tokens
Output32,000 tokens
Anthropic
Claude Opus 4
Input200,000 tokens
Output32,000 tokens
Sun May 31 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4.1 and Claude Opus 4 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Opus 4.1

Text
Images
Audio
Video

Claude Opus 4

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 Opus 4.1

Proprietary

Closed source

Claude Opus 4

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.1 was released on 2025-08-05, while Claude Opus 4 was released on 2025-05-22.

Claude Opus 4.1 is 3 months newer than Claude Opus 4.

Claude Opus 4.1

Aug 5, 2025

9 months ago

2mo newer
Claude Opus 4

May 22, 2025

1.0 years ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

Claude Opus 4.1 is available from Anthropic, Bedrock, Google. Claude Opus 4 is available from Anthropic, Bedrock, Google.

Claude Opus 4.1

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

Claude Opus 4

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
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic
Higher AIME 2025 score (78.0% vs 75.5%)
Higher GPQA score (80.9% vs 79.6%)
Higher MMMLU score (89.5% vs 88.8%)
Higher MMMU (validation) score (77.1% vs 76.5%)
Higher SWE-Bench Verified score (74.5% vs 72.5%)
Higher TAU-bench Retail score (82.4% vs 81.4%)
Higher Terminal-Bench score (43.3% vs 39.2%)
Anthropic
Higher TAU-bench Airline score (59.6% vs 56.0%)
AnthropicClaude Opus 4.1
AnthropicClaude Opus 4
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Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.1
Anthropic
Claude Opus 4

FAQ

Common questions about Claude Opus 4.1 vs Claude Opus 4.

Which is better, Claude Opus 4.1 or Claude Opus 4?

Claude Opus 4.1 significantly outperforms across most benchmarks. Claude Opus 4.1 is made by Anthropic and Claude Opus 4 is made by Anthropic. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Opus 4.1 compare to Claude Opus 4 in benchmarks?

Claude Opus 4.1 scores MMMLU: 89.5%, TAU-bench Retail: 82.4%, GPQA: 80.9%, AIME 2025: 78.0%, MMMU (validation): 77.1%. Claude Opus 4 scores MMMLU: 88.8%, TAU-bench Retail: 81.4%, GPQA: 79.6%, MMMU (validation): 76.5%, AIME 2025: 75.5%.

Is Claude Opus 4.1 cheaper than Claude Opus 4?

Both models cost $15.00 per million input tokens.

What are the context window sizes for Claude Opus 4.1 and Claude Opus 4?

Claude Opus 4.1 supports 200K tokens and Claude Opus 4 supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.