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Claude Sonnet 4.5 vs GPT-5.2
Comprehensive side-by-side LLM comparison
GPT-5.2 leads with 9.9% higher average benchmark score. Claude Sonnet 4.5 is available on 3 providers. Overall, GPT-5.2 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-5.2, released by OpenAI on December 11, 2025, is a large language model from the GPT-5 family that improves on GPT-5 in general intelligence, long-context understanding, agentic tool-calling, and vision. It features a 400K token context window, 128K maximum output tokens, and a knowledge cutoff of August 2025. GPT-5.2 targets long-context coding tasks, extended document analysis, and complex agentic workflows requiring reliable instruction following.
2 months newer
Claude Sonnet 4.5
Anthropic
2025-09-29
GPT-5.2
OpenAI
2025-12-11
Performance Metrics
Context window and performance specifications
Average performance across 18 common benchmarks
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Claude Sonnet 4.5
Average Score:57.8%
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GPT-5.2
Average Score:67.7%(+9.9%)
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Science83.4%
Knowledge89.5%
Multimodal66.1%
Agents66.0%
Coding58.4%
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4.5
2025-01
GPT-5.2
2025-08
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-5.2
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Claude Sonnet 4.5
Avg Score:57.8%
Providers:3
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GPT-5.2
Avg Score:67.7%(+9.9%)
Providers:0