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Claude Sonnet 4.5 vs GPT-4o
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 23.6% higher average benchmark score. Claude Sonnet 4.5 offers 119.6K more tokens in context window than GPT-4o. GPT-4o is $5.50 cheaper per million tokens. Overall, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4.5 was developed to bridge human thinking and machine assistance, allowing people to work with language and tools in a more conversational and natural way. Built with a focus on turning ideas into results, it represents an evolution in making AI feel less mechanical while maintaining strong capabilities across reasoning, coding, and collaborative tasks.
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OpenAI
This updated version of GPT-4o was released with refinements to its multimodal capabilities and improved performance across text, vision, and audio tasks. Built to incorporate learnings from the initial GPT-4o deployment, it enhanced reliability and accuracy while maintaining the seamless cross-modal reasoning that defines the GPT-4o family.
1 year newer
GPT-4o
OpenAI
2024-08-06
Claude Sonnet 4.5
Anthropic
2025-09-29
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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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GPT-4o
Input:$2.50
Output:$10.00($5.50 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 5 common benchmarks
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Claude Sonnet 4.5
Average Score:81.2%(+23.6%)
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GPT-4o
Average Score:57.6%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Coding77.2%(+44.0%)
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GPT-4o
Coding33.2%
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Knowledge Cutoff
Training data recency comparison
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:81.2%(+23.6%)
Providers:2
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GPT-4o
Avg Score:57.6%
Providers:2