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Claude Opus 4.5 vs Claude Sonnet 4.5
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 7.2% higher average benchmark score. Claude Sonnet 4.5 is $12.00 cheaper per million tokens. Overall, Claude Opus 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude Opus 4.5, released by Anthropic in November 2025, is a large language model from the Claude 4.5 family built for demanding reasoning tasks, advanced code generation, and complex agentic workflows. It features a 200K token context window, 64K maximum output tokens, native image understanding, and extended thinking with configurable effort levels. Opus 4.5 targets deep analytical work, multi-step tool orchestration, and applications requiring sustained reasoning across long, complex tasks.
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Anthropic
Claude Sonnet 4.5, released by Anthropic in September 2025, is a large language model from the Claude 4.5 family that balances response quality and efficiency for coding, agentic tasks, and analytical work. It features a 200K token context window (extendable to 1M tokens in beta), 64K maximum output tokens, native image understanding, and extended thinking support. Sonnet 4.5 targets use cases that require a balance of throughput and reasoning depth, including code generation, data analysis, and multi-step agentic pipelines.
1 month newer
Claude Sonnet 4.5
Anthropic
2025-09-29
Claude Opus 4.5
Anthropic
2025-11-01
Pricing Comparison
Cost per million tokens (USD)
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Claude Opus 4.5
Input:$5.00
Output:$25.00
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Claude Sonnet 4.5
Input:$3.00
Output:$15.00($12.00 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 19 common benchmarks
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Claude Opus 4.5
Average Score:61.9%(+7.2%)
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Claude Sonnet 4.5
Average Score:54.7%
Performance comparison across key benchmark categories
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Claude Opus 4.5
Knowledge90.8%(+1.3%)
Science87.0%(+3.6%)
Agents72.9%(+6.9%)
Tool Use62.3%(+18.5%)
Coding61.5%(+3.1%)
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4.5
2025-01
Claude Opus 4.5
2025-05
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 4.5
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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Claude Sonnet 4.5
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Claude Opus 4.5
Avg Score:61.9%(+7.2%)
Providers:3
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Claude Sonnet 4.5
Avg Score:54.7%
Providers:3