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Claude Sonnet 4.5 vs Phi 4
Comprehensive side-by-side LLM comparison
Phi 4 leads with 8.4% higher average benchmark score. Claude Sonnet 4.5 offers 232.0K more tokens in context window than Phi 4. Phi 4 is $17.79 cheaper per million tokens. Claude Sonnet 4.5 supports multimodal inputs. Overall, Phi 4 is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4.5 is a multimodal language model developed by Anthropic. It achieves strong performance with an average score of 75.8% across 9 benchmarks. It excels particularly in MMMLU (89.1%), AIME 2025 (87.0%), TAU-bench Retail (86.2%). It supports a 264K token context window for handling large documents. The model is available through 2 API providers. As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2025, it represents Anthropic's latest advancement in AI technology.
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Microsoft
Phi 4 is a language model developed by Microsoft. It achieves strong performance with an average score of 66.0% across 13 benchmarks. It excels particularly in MMLU (84.8%), HumanEval+ (82.8%), HumanEval (82.6%). The model is available through 1 API provider. It's licensed for commercial use, making it suitable for enterprise applications. Released in 2024, it represents Microsoft's latest advancement in AI technology.
9 months newer
Phi 4
Microsoft
2024-12-12
Claude Sonnet 4.5
Anthropic
2025-09-29
Pricing Comparison
Cost per million tokens (USD)
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Claude Sonnet 4.5
Input:$3.00
Output:$15.00
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Phi 4
Input:$0.07
Output:$0.14($17.79 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 21 common benchmarks
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Claude Sonnet 4.5
Average Score:32.5%
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Phi 4
Average Score:40.9%(+8.4%)
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Knowledge Cutoff
Training data recency comparison
Phi 4
2024-06-01
Claude Sonnet 4.5
2025-01-31
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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Claude Sonnet 4.5
2 providers
Anthropic
Throughput: 42 tok/s
Latency: 0.4ms
ZeroEval
Throughput: 42 tok/s
Latency: 0.4ms
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Claude Sonnet 4.5
Avg Score:32.5%
Providers:2
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Phi 4
Avg Score:40.9%(+8.4%)
Providers:1