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Claude Opus 4.5 vs o4 mini
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 25.3% higher average benchmark score. o4 mini offers 36.0K more tokens in context window than Claude Opus 4.5. o4 mini is $24.50 cheaper per million tokens. 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 o4 mini, released by OpenAI in April 2025, is a compact reasoning model from the o4 family that combines multimodal understanding with efficient chain-of-thought processing. It features a 200K token context window and native image understanding, with strong performance on mathematics and coding benchmarks relative to its inference cost. o4 mini targets cost-sensitive applications requiring both visual reasoning and mathematical accuracy.
6 months newer
o4 mini
OpenAI
2025-04-16
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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o4 mini
Input:$1.10
Output:$4.40($24.50 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 4 common benchmarks
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Claude Opus 4.5
Average Score:35.8%(+25.3%)
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o4 mini
Average Score:10.5%
Performance comparison across key benchmark categories
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Claude Opus 4.5
Agents56.6%(+42.3%)
Reasoning30.8%(+16.5%)
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o4 mini
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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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o4 mini
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Claude Opus 4.5
Avg Score:35.8%(+25.3%)
Providers:3
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o4 mini
Avg Score:10.5%
Providers:1