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Claude Opus 4.5 vs o1
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 30.8% higher average benchmark score. o1 offers 36.0K more tokens in context window than Claude Opus 4.5. Claude Opus 4.5 is $45.00 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 o1, released by OpenAI in December 2024, is a reasoning-focused large language model that applies extended chain-of-thought processing before generating responses. It features a 200K token context window and native image understanding, demonstrating strong performance on STEM benchmarks requiring multi-step reasoning. o1 targets mathematics, science, and coding tasks where careful deliberation over the problem produces more accurate outputs than direct generation.
11 months newer
o1
OpenAI
2024-12-05
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($45.00 cheaper)
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o1
Input:$15.00
Output:$60.00
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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Claude Opus 4.5
Average Score:33.4%(+30.8%)
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o1
Average Score:2.6%
Performance comparison across key benchmark categories
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Claude Opus 4.5
Agents67.8%(+61.5%)
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o1
Agents6.3%
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Knowledge Cutoff
Training data recency comparison
o1
2023-10
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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o1
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Claude Opus 4.5
Avg Score:33.4%(+30.8%)
Providers:3
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o1
Avg Score:2.6%
Providers:1