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Claude Opus 4.5 vs GPT-4o
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 40.5% higher average benchmark score. Claude Opus 4.5 offers 119.6K more tokens in context window than GPT-4o. GPT-4o is $17.50 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
GPT-4o, released by OpenAI in May 2024, is a multimodal large language model from the GPT-4 family that natively processes text, image, and audio inputs in a single end-to-end model. It features a 128K token context window and demonstrated competitive performance across coding, reasoning, and vision benchmarks at its release. GPT-4o targets general-purpose assistant applications, vision-enabled workflows, and use cases requiring low-latency multimodal understanding.
1 year newer
GPT-4o
OpenAI
2024-05-13
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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GPT-4o
Input:$2.50
Output:$10.00($17.50 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 3 common benchmarks
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Claude Opus 4.5
Average Score:64.9%(+40.5%)
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GPT-4o
Average Score:24.4%
Performance comparison across key benchmark categories
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Claude Opus 4.5
Science87.0%(+30.9%)
Tool Use62.3%(+55.1%)
Agents45.5%(+35.6%)
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Knowledge Cutoff
Training data recency comparison
GPT-4o
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
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Claude Opus 4.5
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-4o
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Claude Opus 4.5
Avg Score:64.9%(+40.5%)
Providers:3
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GPT-4o
Avg Score:24.4%
Providers:1