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Claude Opus 4.1 vs Claude Sonnet 4.5
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 5.5% higher average benchmark score. Claude Sonnet 4.5 offers 32.0K more tokens in context window than Claude Opus 4.1. Claude Sonnet 4.5 is $72.00 cheaper per million tokens. Claude Opus 4.1 is available on 4 providers. Overall, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude Opus 4.1 represents an iteration within the Claude 4 Opus line, built to deliver refined performance in complex reasoning and analysis tasks. Developed as part of Anthropic's flagship tier, it incorporates improvements to the foundational capabilities that define the Opus family of models.
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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.
1 month newer
Claude Opus 4.1
Anthropic
2025-08-05
Claude Sonnet 4.5
Anthropic
2025-09-29
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Pricing Comparison
Cost per million tokens (USD)
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Claude Opus 4.1
Input:$15.00
Output:$75.00
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Claude Sonnet 4.5
Input:$3.00
Output:$15.00($72.00 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 7 common benchmarks
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Claude Opus 4.1
Average Score:72.1%
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Claude Sonnet 4.5
Average Score:77.6%(+5.5%)
Performance comparison across key benchmark categories
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Claude Opus 4.1
Coding74.5%
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Claude Sonnet 4.5
Coding77.2%(+2.7%)
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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 Opus 4.1
4 providers
Anthropic
Throughput: 100 tok/s
Latency: 0.5ms
Bedrock
Throughput: 120 tok/s
Latency: 0.5ms
Throughput: 42 tok/s
Latency: 0.4ms
ZeroEval
Throughput: 42 tok/s
Latency: 0.4ms
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Claude Opus 4.1
Avg Score:72.1%
Providers:4
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Claude Sonnet 4.5
Avg Score:77.6%(+5.5%)
Providers:2