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Claude Opus 4.5 vs o3 mini
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 66.3% higher average benchmark score. o3 mini offers 36.0K more tokens in context window than Claude Opus 4.5. o3 mini is $24.50 cheaper per million tokens. Claude Opus 4.5 supports multimodal inputs. Claude Opus 4.5 is available on 3 providers. Overall, Claude Opus 4.5 is the stronger choice for coding tasks.
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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.
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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.
9 months newer
o3 mini
OpenAI
2025-01-31
Claude Opus 4.5
Anthropic
2025-11-01
Pricing Comparison
Cost per million tokens (USD)
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Claude Opus 4.5
Input:$5.00
Output:$25.00
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o3 mini
Input:$1.10
Output:$4.40($24.50 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Opus 4.5
Average Score:67.8%(+66.3%)
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o3 mini
Average Score:1.5%
Performance comparison across key benchmark categories
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Claude Opus 4.5
Agents67.8%(+66.3%)
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o3 mini
Agents1.5%
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Knowledge Cutoff
Training data recency comparison
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
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Claude Opus 4.5
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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o3 mini
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Claude Opus 4.5
Avg Score:67.8%(+66.3%)
Providers:3
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o3 mini
Avg Score:1.5%
Providers:1