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Claude Opus 4.5 vs GPT-5
Comprehensive side-by-side LLM comparison
Claude Opus 4.5 leads with 1.1% higher average benchmark score. GPT-5 offers 168.8K more tokens in context window than Claude Opus 4.5. Claude Opus 4.5 is $120.00 cheaper per million tokens. Claude Opus 4.5 is available on 3 providers. Both models have their strengths depending on your specific coding needs.
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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-5, released by OpenAI on August 7, 2025, is a large language model that combines direct generation and extended reasoning in a single unified system with a built-in routing mechanism. It features a 400K token context window, 128K maximum output tokens, native multimodal support (text, image, audio, video), and demonstrated strong results across coding, mathematics, visual understanding, and health benchmarks at release. GPT-5 targets complex multi-step tasks including advanced coding, mathematical problem solving, and long-context analysis.
2 months newer
GPT-5
OpenAI
2025-08-07
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($120.00 cheaper)
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GPT-5
Input:$30.00
Output:$120.00
Performance Metrics
Context window and performance specifications
Average performance across 7 common benchmarks
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Claude Opus 4.5
Average Score:53.3%(+1.1%)
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GPT-5
Average Score:52.2%
Performance comparison across key benchmark categories
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Claude Opus 4.5
Science87.0%
Coding80.9%(+6.0%)
Tool Use62.3%(+17.8%)
Agents56.6%(+29.2%)
Reasoning30.8%(+5.5%)
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Knowledge Cutoff
Training data recency comparison
Claude Opus 4.5
2025-05
GPT-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-5
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Claude Opus 4.5
Avg Score:53.3%(+1.1%)
Providers:3
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GPT-5
Avg Score:52.2%
Providers:1