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Claude 3.5 Sonnet vs Claude Sonnet 4.5
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 35.7% higher average benchmark score. Claude Sonnet 4.5 offers 55.9K more tokens in context window than Claude 3.5 Sonnet. Both models have similar pricing. Overall, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude 3.5 Sonnet, updated by Anthropic in October 2024 (originally released June 2024), is a large language model from the Claude 3.5 family that delivered strong performance in coding, reasoning, and instruction-following at its release. It supports a 200K token context window, 8K maximum output tokens, and native image understanding including screenshot analysis and document comprehension. Claude 3.5 Sonnet targets general-purpose development tasks, document analysis, and applications requiring reliable instruction following with visual input support.
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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.
11 months newer
Claude 3.5 Sonnet
Anthropic
2024-10-22
Claude Sonnet 4.5
Anthropic
2025-09-29
Pricing Comparison
Cost per million tokens (USD)
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Claude 3.5 Sonnet
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 3.5 Sonnet
Average Score:28.0%
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Claude Sonnet 4.5
Average Score:63.7%(+35.7%)
Performance comparison across key benchmark categories
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Claude 3.5 Sonnet
Science55.0%
Agents0.9%
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Claude Sonnet 4.5
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Knowledge Cutoff
Training data recency comparison
Claude 3.5 Sonnet
2024-04
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 3.5 Sonnet
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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Claude Sonnet 4.5
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Claude 3.5 Sonnet
Avg Score:28.0%
Providers:3
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Claude Sonnet 4.5
Avg Score:63.7%(+35.7%)
Providers:3