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Claude Sonnet 4.5 vs o3 mini
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 42.4% higher average benchmark score. o3 mini offers 36.0K more tokens in context window than Claude Sonnet 4.5. o3 mini is $12.50 cheaper per million tokens. Claude Sonnet 4.5 supports multimodal inputs. Claude Sonnet 4.5 is available on 3 providers. Overall, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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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.
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OpenAI
OpenAI o3 mini, released by OpenAI in January 2025, is a compact reasoning model from the o3 family designed for efficient, cost-effective STEM problem-solving. It features a 200K token context window and adjustable chain-of-thought effort settings, allowing developers to trade reasoning depth for speed. o3 mini targets science, mathematics, and coding applications where lower inference cost and faster response times are a priority.
8 months newer
o3 mini
OpenAI
2025-01-31
Claude Sonnet 4.5
Anthropic
2025-09-29
Pricing Comparison
Cost per million tokens (USD)
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Claude Sonnet 4.5
Input:$3.00
Output:$15.00
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o3 mini
Input:$1.10
Output:$4.40($12.50 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Sonnet 4.5
Average Score:43.9%(+42.4%)
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o3 mini
Average Score:1.5%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Agents43.9%(+42.4%)
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o3 mini
Agents1.5%
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Knowledge Cutoff
Training data recency comparison
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 4.5
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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o3 mini
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Claude Sonnet 4.5
Avg Score:43.9%(+42.4%)
Providers:3
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o3 mini
Avg Score:1.5%
Providers:1