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Claude Sonnet 4.5 vs o1
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 15.7% higher average benchmark score. o1 offers 36.0K more tokens in context window than Claude Sonnet 4.5. Claude Sonnet 4.5 is $57.00 cheaper per million tokens. Claude Sonnet 4.5 supports multimodal inputs. 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
o1 was developed as part of OpenAI's reasoning-focused model series, designed to spend more time thinking before responding. Built to excel at complex reasoning tasks in science, coding, and mathematics, it employs extended internal reasoning processes to solve harder problems than traditional language models through careful step-by-step analysis.
9 months newer
o1
OpenAI
2024-12-17
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($57.00 cheaper)
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o1
Input:$15.00
Output:$60.00
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%(+15.7%)
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o1
Average Score:65.5%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Coding77.2%(+36.2%)
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o1
Coding41.0%
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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%(+15.7%)
Providers:2
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o1
Avg Score:65.5%
Providers:2