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Claude Sonnet 4.5 vs GPT-5 Pro
Comprehensive side-by-side LLM comparison
GPT-5 Pro leads with 13.9% higher average benchmark score. Claude Sonnet 4.5 is available on 3 providers. Overall, GPT-5 Pro is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4.5, released by Anthropic in September 2025, is a large language model from the Claude 4.5 family that balances response quality and efficiency for coding, agentic tasks, and analytical work. It features a 200K token context window (extendable to 1M tokens in beta), 64K maximum output tokens, native image understanding, and extended thinking support. Sonnet 4.5 targets use cases that require a balance of throughput and reasoning depth, including code generation, data analysis, and multi-step agentic pipelines.
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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.
1 month newer
GPT-5 Pro
OpenAI
2025-08-07
Claude Sonnet 4.5
Anthropic
2025-09-29
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Sonnet 4.5
Average Score:17.7%
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GPT-5 Pro
Average Score:31.6%(+13.9%)
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Reasoning17.7%
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GPT-5 Pro
Reasoning31.6%(+13.9%)
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4.5
2025-01
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 Sonnet 4.5
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-5 Pro
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Claude Sonnet 4.5
Avg Score:17.7%
Providers:3
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GPT-5 Pro
Avg Score:31.6%(+13.9%)
Providers:0