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Claude Sonnet 4 vs Claude Sonnet 4.5
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 12.8% higher average benchmark score. Both models have similar pricing. Overall, Claude Sonnet 4.5 is the stronger choice for coding 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.
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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.
4 months newer
Claude Sonnet 4
Anthropic
2025-05-14
Claude Sonnet 4.5
Anthropic
2025-09-29
Pricing Comparison
Cost per million tokens (USD)
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Claude Sonnet 4
Input:$3.00
Output:$15.00
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Claude Sonnet 4.5
Input:$3.00
Output:$15.00
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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Claude Sonnet 4
Average Score:39.8%
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Claude Sonnet 4.5
Average Score:52.6%(+12.8%)
Performance comparison across key benchmark categories
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Claude Sonnet 4
Agents43.9%
Tool Use35.6%
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Claude Sonnet 4.5
Agents
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4
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 Sonnet 4
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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Claude Sonnet 4.5
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Claude Sonnet 4
Avg Score:39.8%
Providers:3
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Claude Sonnet 4.5
Avg Score:52.6%(+12.8%)
Providers:3