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Claude Sonnet 4.5 vs GPT-5
Comprehensive side-by-side LLM comparison
GPT-5 leads with 2.5% higher average benchmark score. GPT-5 offers 264.0K more tokens in context window than Claude Sonnet 4.5. GPT-5 is $6.75 cheaper per million tokens. Both models have their strengths depending on your specific coding needs.
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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-5 represents the next generation of OpenAI's foundational models, developed to advance the frontier of AI capabilities in reasoning, knowledge, and general intelligence. Built to push beyond the limitations of GPT-4, it incorporates architectural and training improvements designed to enhance performance across diverse tasks and domains.
1 month newer
GPT-5
OpenAI
2025-08-07
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-5
Input:$1.25
Output:$10.00($6.75 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 3 common benchmarks
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Claude Sonnet 4.5
Average Score:82.5%
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GPT-5
Average Score:85.1%(+2.5%)
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Coding77.2%(+2.3%)
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GPT-5
Coding74.9%
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Knowledge Cutoff
Training data recency comparison
GPT-5
2024-09-30
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:82.5%
Providers:2
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GPT-5
Avg Score:85.1%(+2.5%)
Providers:2