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Claude Sonnet 4.5 vs GPT-4.5
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 19.0% higher average benchmark score. Claude Sonnet 4.5 offers 131.9K more tokens in context window than GPT-4.5. Claude Sonnet 4.5 is $207.00 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
GPT-4.5 was developed as an intermediate advancement between GPT-4 and GPT-5, designed to incorporate incremental improvements in reasoning, factuality, and instruction-following. Built to bridge generational capabilities while maintaining compatibility with existing applications, it represents a refinement of the GPT-4 architecture with enhanced performance characteristics.
7 months newer
GPT-4.5
OpenAI
2025-02-27
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($207.00 cheaper)
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GPT-4.5
Input:$75.00
Output:$150.00
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%(+19.0%)
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GPT-4.5
Average Score:62.2%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Coding77.2%(+39.2%)
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GPT-4.5
Coding38.0%
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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%(+19.0%)
Providers:2
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GPT-4.5
Avg Score:62.2%
Providers:1