Claude 3 Sonnet vs Phi 4 Reasoning Plus
Phi 4 Reasoning Plus significantly outperforms across most benchmarks.
Anthropic · Microsoft · Updated for 2026
Which is better?
Claude 3 Sonnet outperforms in 0 benchmarks, while Phi 4 Reasoning Plus is better at 2 benchmarks (GPQA, MMLU-Pro). Phi 4 Reasoning Plus significantly outperforms across most benchmarks.
Based on current benchmark, pricing, and model metadata for 2026.
Choose Claude 3 Sonnet
- you want predictable pricing at $3.00/M input and $15.00/M output
Choose Phi 4 Reasoning Plus
- you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
- you want the most recent training data — it shipped Apr 2025
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Performance Benchmarks
Comparative analysis across standard metrics
Claude 3 Sonnet outperforms in 0 benchmarks, while Phi 4 Reasoning Plus is better at 2 benchmarks (GPQA, MMLU-Pro).
Phi 4 Reasoning Plus significantly outperforms across most benchmarks.
Arena Performance
Playground indexes and blind preference scores
Context Window
Maximum input and output token capacity
Only Claude 3 Sonnet specifies input context (200,000 tokens). Only Claude 3 Sonnet specifies output context (200,000 tokens).
Input Capabilities
Supported data types and modalities
Claude 3 Sonnet supports multimodal inputs, whereas Phi 4 Reasoning Plus does not.
Claude 3 Sonnet can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude 3 Sonnet
Phi 4 Reasoning Plus
License
Usage and distribution terms
Claude 3 Sonnet is licensed under a proprietary license, while Phi 4 Reasoning Plus uses MIT.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
MIT
Open weights
Release Timeline
When each model was launched
Claude 3 Sonnet was released on 2024-02-29, while Phi 4 Reasoning Plus was released on 2025-04-30.
Phi 4 Reasoning Plus is 14 months newer than Claude 3 Sonnet.
Feb 29, 2024
2.5 years ago
Apr 30, 2025
1.3 years ago
1.2yr newerKnowledge Cutoff
When training data ends
Phi 4 Reasoning Plus has a documented knowledge cutoff of 2025-03-01, while Claude 3 Sonnet's cutoff date is not specified.
We can confirm Phi 4 Reasoning Plus's training data extends to 2025-03-01, but cannot make a direct comparison without Claude 3 Sonnet's cutoff date.
—
Mar 2025
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude 3 Sonnet and Phi 4 Reasoning Plus side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude 3 Sonnet vs Phi 4 Reasoning Plus.