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Claude Sonnet 4 vs GPT-5.1
Comprehensive side-by-side LLM comparison
GPT-5.1 leads with 8.9% higher average benchmark score. Claude Sonnet 4 is available on 3 providers. Overall, GPT-5.1 is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4, released by Anthropic in May 2025, is a large language model from the Claude 4 family that delivers a balance of performance and efficiency for coding, reasoning, and analytical tasks. 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 targets development workflows, document analysis, and applications that benefit from the performance characteristics of the Claude 4 generation.
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OpenAI
GPT-5.1, released by OpenAI in November 2025, is a large language model from the GPT-5 family that delivers incremental improvements in reasoning, instruction following, and multimodal understanding over GPT-5. It features a 400K token context window and targets general-purpose development, long-context analysis, and agentic workflows.
5 months newer
Claude Sonnet 4
Anthropic
2025-05-14
GPT-5.1
OpenAI
2025-11
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Sonnet 4
Average Score:35.6%
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GPT-5.1
Average Score:44.5%(+8.9%)
Performance comparison across key benchmark categories
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Claude Sonnet 4
Tool Use35.6%
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GPT-5.1
Tool Use44.5%(+8.9%)
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4
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
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-5.1
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Claude Sonnet 4
Avg Score:35.6%
Providers:3
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GPT-5.1
Avg Score:44.5%(+8.9%)
Providers:0