Claude 3.5 Sonnet vs Phi 4 Reasoning
Claude 3.5 Sonnet leads the LLM Stats Score 19.1 to 12.0.
Anthropic · Microsoft · Updated for 2026
Which is better?
Claude 3.5 Sonnet leads the overall LLM Stats Score 19.1 to 12.0, ranking #213 overall.
In the 2 individual benchmarks reported for both models, Claude 3.5 Sonnet wins 2; this is a narrower head-to-head signal than the composite indexes.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude 3.5 Sonnet
- overall performance matters — it scores 19.1 and ranks #213 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you value its reported benchmark strengths — it wins 2 of 2 exact shared results
Choose Phi 4 Reasoning
- 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.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
19 reported for Claude 3.5 Sonnet · 11 for Phi 4 Reasoning
Claude 3.5 Sonnet outperforms in 2 benchmarks (GPQA, MMLU-Pro), while Phi 4 Reasoning is better at 0 benchmarks.
Claude 3.5 Sonnet significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Only Claude 3.5 Sonnet specifies input context (200,000 tokens). Only Claude 3.5 Sonnet specifies output context (200,000 tokens).
Input capabilities
Documented input modalities across available providers
Claude 3.5 Sonnet supports multimodal inputs, whereas Phi 4 Reasoning does not.
Claude 3.5 Sonnet can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude 3.5 Sonnet
Phi 4 Reasoning
License
Usage and distribution terms
Claude 3.5 Sonnet 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.
Proprietary
Closed source
MIT
Open weights
Release Timeline
When each model was launched
Claude 3.5 Sonnet was released on 2024-10-22, while Phi 4 Reasoning was released on 2025-04-30.
Phi 4 Reasoning is 6 months newer than Claude 3.5 Sonnet.
Oct 22, 2024
1.9 years ago
Apr 30, 2025
1.4 years ago
6mo newerKnowledge Cutoff
When training data ends
Phi 4 Reasoning has a documented knowledge cutoff of 2025-03-01, while Claude 3.5 Sonnet'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 3.5 Sonnet's cutoff date.
—
Mar 2025
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude 3.5 Sonnet and Phi 4 Reasoning side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude 3.5 Sonnet vs Phi 4 Reasoning.