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Claude Opus 4.5 vs GPT-5 Pro
Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. 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 Pro is an extended-reasoning variant from the GPT-5 family that applies more compute per response for deeper, more thorough answers on complex problems. It features the same 400K token context window and multimodal capabilities as GPT-5, with additional reasoning depth suited to research-grade analysis, advanced coding, and tasks requiring comprehensive, accurate outputs.
2 months newer
GPT-5 Pro
OpenAI
2025-08-07
Claude Opus 4.5
Anthropic
2025-11-01
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Opus 4.5
Average Score:30.8%
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GPT-5 Pro
Average Score:31.6%(+0.8%)
Performance comparison across key benchmark categories
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Claude Opus 4.5
Reasoning30.8%
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GPT-5 Pro
Reasoning31.6%(+0.8%)
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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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GPT-5 Pro
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Claude Opus 4.5
Avg Score:30.8%
Providers:3
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GPT-5 Pro
Avg Score:31.6%(+0.8%)
Providers:0