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Claude Sonnet 4.5 vs GPT-5
Comprehensive side-by-side LLM comparison
GPT-5 leads with 6.6% higher average benchmark score. GPT-5 offers 168.8K more tokens in context window than Claude Sonnet 4.5. Claude Sonnet 4.5 is $132.00 cheaper per million tokens. Claude Sonnet 4.5 is available on 3 providers. Overall, GPT-5 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, 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.
1 month newer
GPT-5
OpenAI
2025-08-07
Claude Sonnet 4.5
Anthropic
2025-09-29
Pricing Comparison
Cost per million tokens (USD)
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Claude Sonnet 4.5
Input:$3.00
Output:$15.00($132.00 cheaper)
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GPT-5
Input:$30.00
Output:$120.00
Performance Metrics
Context window and performance specifications
Average performance across 8 common benchmarks
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Claude Sonnet 4.5
Average Score:49.0%
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GPT-5
Average Score:55.7%(+6.6%)
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Science83.4%
Coding77.2%(+2.3%)
Agents57.0%(+12.1%)
Tool Use43.8%
Reasoning17.7%
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4.5
2025-01
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 Sonnet 4.5
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-5
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Claude Sonnet 4.5
Avg Score:49.0%
Providers:3
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GPT-5
Avg Score:55.7%(+6.6%)
Providers:1