+
+
+
+
+
+
+
+
VS
VS
VS
VS
VS
VS
Claude 3.5 Sonnet vs Claude Opus 4.5
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 49.5% higher average benchmark score. Claude Opus 4.5 offers 55.9K more tokens in context window than Claude 3.5 Sonnet. Claude 3.5 Sonnet is $12.00 cheaper per million tokens. Overall, Claude Opus 4.5 is the stronger choice for coding tasks.
+
+
+
+
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.
+
+
+
+
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.
1 year newer
Claude 3.5 Sonnet
Anthropic
2024-10-22
Claude Opus 4.5
Anthropic
2025-11-01
Pricing Comparison
Cost per million tokens (USD)
+
+
+
+
Claude 3.5 Sonnet
Input:$3.00
Output:$15.00($12.00 cheaper)
+
+
+
+
Claude Opus 4.5
Input:$5.00
Output:$25.00
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
+
+
+
+
Claude 3.5 Sonnet
Average Score:28.0%
+
+
+
+
Claude Opus 4.5
Average Score:77.4%(+49.5%)
Performance comparison across key benchmark categories
+
+
+
+
Claude 3.5 Sonnet
Science55.0%
Agents0.9%
+
+
+
+
Claude Opus 4.5
+
+
+
+
Knowledge Cutoff
Training data recency comparison
Claude 3.5 Sonnet
2024-04
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
+
+
+
+
Claude 3.5 Sonnet
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
+
+
+
+
Claude Opus 4.5
+
+
+
+
Claude 3.5 Sonnet
Avg Score:28.0%
Providers:3
+
+
+
+
Claude Opus 4.5
Avg Score:77.4%(+49.5%)
Providers:3