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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 8.3% 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. Overall, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude Opus 4.1, released by Anthropic in August 2025, is a large language model from the Claude 4 family optimized for demanding reasoning, multi-step coding, and extended analysis tasks. It features a 200K token context window, 32K maximum output tokens, native image understanding, and extended thinking capabilities. Opus 4.1 targets complex problem-solving, multi-turn reasoning workflows, and applications requiring deep analysis with integrated tool use.
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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 Opus 4.1
Anthropic
2025-08-05
Claude Sonnet 4.5
Anthropic
2025-09-29
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 6 common benchmarks
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Claude Opus 4.1
Average Score:40.0%
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Claude Sonnet 4.5
Average Score:48.3%(+8.3%)
Performance comparison across key benchmark categories
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Claude Opus 4.1
Science80.9%
Coding74.5%
Tool Use40.9%
Agents22.3%
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Knowledge Cutoff
Training data recency comparison
Claude Opus 4.1
2025-01
Claude Sonnet 4.5
2025-01
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
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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Claude Sonnet 4.5
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Claude Opus 4.1
Avg Score:40.0%
Providers:3
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Claude Sonnet 4.5
Avg Score:48.3%(+8.3%)
Providers:3