Claude 3 Sonnet vs Phi-3.5-mini-instruct
Claude 3 Sonnet significantly outperforms across most benchmarks. Phi-3.5-mini-instruct is 60.0x cheaper per token.
Anthropic · Microsoft · Updated for 2026
Which is better?
Claude 3 Sonnet outperforms in 9 benchmarks (ARC-C, BIG-Bench Hard, GPQA, GSM8k, HellaSwag, HumanEval, MGSM, MMLU, MMLU-Pro), while Phi-3.5-mini-instruct is better at 1 benchmark (MATH). Claude 3 Sonnet significantly outperforms across most benchmarks.
On price, Phi-3.5-mini-instruct is roughly 60.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude 3 Sonnet also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current benchmark, pricing, and model metadata for 2026.
Choose Claude 3 Sonnet
- you want the strongest raw capability — it leads on 9 of 10 shared benchmarks
- you process long inputs — it offers a 200,000 token context window
Choose Phi-3.5-mini-instruct
- cost matters — it's about 60.0x cheaper per token
- you want the most recent training data — it shipped Aug 2024
- 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 9 benchmarks (ARC-C, BIG-Bench Hard, GPQA, GSM8k, HellaSwag, HumanEval, MGSM, MMLU, MMLU-Pro), while Phi-3.5-mini-instruct is better at 1 benchmark (MATH).
Claude 3 Sonnet significantly outperforms across most benchmarks.
Arena Performance
Playground indexes and blind preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude 3 Sonnet ($3.00/1M tokens) is 30.0x more expensive than Phi-3.5-mini-instruct ($0.10/1M tokens).
For output processing, Claude 3 Sonnet ($15.00/1M tokens) is 150.0x more expensive than Phi-3.5-mini-instruct ($0.10/1M tokens).
In conclusion, Claude 3 Sonnet is more expensive than Phi-3.5-mini-instruct.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Claude 3 Sonnet accepts 200,000 input tokens compared to Phi-3.5-mini-instruct's 128,000 tokens. Claude 3 Sonnet can generate longer responses up to 200,000 tokens, while Phi-3.5-mini-instruct is limited to 128,000 tokens.
Input Capabilities
Supported data types and modalities
Claude 3 Sonnet supports multimodal inputs, whereas Phi-3.5-mini-instruct 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-3.5-mini-instruct
License
Usage and distribution terms
Claude 3 Sonnet is licensed under a proprietary license, while Phi-3.5-mini-instruct 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-3.5-mini-instruct was released on 2024-08-23.
Phi-3.5-mini-instruct is 6 months newer than Claude 3 Sonnet.
Feb 29, 2024
2.5 years ago
Aug 23, 2024
2.0 years ago
5mo newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Claude 3 Sonnet is available from Anthropic, Bedrock, Google. Phi-3.5-mini-instruct is available from Azure.
Claude 3 Sonnet
Phi-3.5-mini-instruct
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude 3 Sonnet and Phi-3.5-mini-instruct side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude 3 Sonnet vs Phi-3.5-mini-instruct.