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Claude Opus 4.5 vs Claude Sonnet 4
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 24.5% higher average benchmark score. Claude Sonnet 4 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, released by Anthropic in May 2025, is a large language model from the Claude 4 family that delivers a balance of performance and efficiency for coding, reasoning, and analytical tasks. 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 targets development workflows, document analysis, and applications that benefit from the performance characteristics of the Claude 4 generation.
5 months newer
Claude Sonnet 4
Anthropic
2025-05-14
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
Input:$3.00
Output:$15.00($12.00 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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Claude Opus 4.5
Average Score:64.3%(+24.5%)
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Claude Sonnet 4
Average Score:39.8%
Performance comparison across key benchmark categories
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Claude Opus 4.5
Agents66.3%(+22.4%)
Tool Use62.3%(+26.7%)
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Claude Sonnet 4
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4
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
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Claude Opus 4.5
Avg Score:64.3%(+24.5%)
Providers:3
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Claude Sonnet 4
Avg Score:39.8%
Providers:3