Model Comparison

Claude Opus 4.1 vs Phi 4 Reasoning

Claude Opus 4.1 significantly outperforms across most benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Claude Opus 4.1 outperforms in 2 benchmarks (AIME 2025, GPQA), while Phi 4 Reasoning is better at 0 benchmarks.

Claude Opus 4.1 significantly outperforms across most benchmarks.

Wed Apr 22 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Cost data unavailable.

Lowest available price from all providers
Wed Apr 22 2026 • llm-stats.com
Anthropic
Claude Opus 4.1
Input tokens$15.00
Output tokens$75.00
Best providerAnthropic
Microsoft
Phi 4 Reasoning
Input tokens$0.00
Output tokens$0.00
Best providerUnknown Organization
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Only Claude Opus 4.1 specifies input context (200,000 tokens). Only Claude Opus 4.1 specifies output context (32,000 tokens).

Anthropic
Claude Opus 4.1
Input200,000 tokens
Output32,000 tokens
Microsoft
Phi 4 Reasoning
Input- tokens
Output- tokens
Wed Apr 22 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude Opus 4.1 supports multimodal inputs, whereas Phi 4 Reasoning does not.

Claude Opus 4.1 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Opus 4.1

Text
Images
Audio
Video

Phi 4 Reasoning

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Opus 4.1 is licensed under a proprietary license, while Phi 4 Reasoning uses MIT.

License differences may affect how you can use these models in commercial or open-source projects.

Claude Opus 4.1

Proprietary

Closed source

Phi 4 Reasoning

MIT

Open weights

Release Timeline

When each model was launched

Claude Opus 4.1 was released on 2025-08-05, while Phi 4 Reasoning was released on 2025-04-30.

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

Claude Opus 4.1

Aug 5, 2025

8 months ago

3mo newer
Phi 4 Reasoning

Apr 30, 2025

11 months ago

Knowledge Cutoff

When training data ends

Phi 4 Reasoning has a documented knowledge cutoff of 2025-03-01, while Claude Opus 4.1's cutoff date is not specified.

We can confirm Phi 4 Reasoning's training data extends to 2025-03-01, but cannot make a direct comparison without Claude Opus 4.1's cutoff date.

Claude Opus 4.1

—

Phi 4 Reasoning

Mar 2025

Outputs Comparison

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Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Supports multimodal inputs
Higher AIME 2025 score (78.0% vs 62.9%)
Higher GPQA score (80.9% vs 65.8%)
Microsoft
Has open weights

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.1
Microsoft
Phi 4 Reasoning

FAQ

Common questions about Claude Opus 4.1 vs Phi 4 Reasoning

Claude Opus 4.1 significantly outperforms across most benchmarks. Claude Opus 4.1 is made by Anthropic and Phi 4 Reasoning is made by Microsoft. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Claude Opus 4.1 scores MMMLU: 89.5%, TAU-bench Retail: 82.4%, GPQA: 80.9%, AIME 2025: 78.0%, MMMU (validation): 77.1%. Phi 4 Reasoning scores FlenQA: 97.7%, HumanEval+: 92.9%, IFEval: 83.4%, OmniMath: 76.6%, AIME 2024: 75.3%.
Claude Opus 4.1 supports 200K tokens and Phi 4 Reasoning supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.
Claude Opus 4.1 is developed by Anthropic and Phi 4 Reasoning is developed by Microsoft.