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Claude Sonnet 4.5 vs GPT-5 Codex
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 2.7% higher average benchmark score. Claude Sonnet 4.5 supports multimodal inputs. Claude Sonnet 4.5 is available on 2 providers. Both models have their strengths depending on your specific coding needs.
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Anthropic
Claude Sonnet 4.5 was developed to bridge human thinking and machine assistance, allowing people to work with language and tools in a more conversational and natural way. Built with a focus on turning ideas into results, it represents an evolution in making AI feel less mechanical while maintaining strong capabilities across reasoning, coding, and collaborative tasks.
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OpenAI
GPT-5 Codex was developed as a specialized variant of GPT-5 optimized for programming and software development tasks. Built to understand and generate code across multiple programming languages, it serves developers with enhanced capabilities for code completion, debugging, translation, and explanation of complex codebases.
14 days newer
GPT-5 Codex
OpenAI
2025-09-15
Claude Sonnet 4.5
Anthropic
2025-09-29
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Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Sonnet 4.5
Average Score:77.2%(+2.7%)
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GPT-5 Codex
Average Score:74.5%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Coding77.2%(+2.7%)
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GPT-5 Codex
Coding74.5%
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Knowledge Cutoff
Training data recency comparison
GPT-5 Codex
2024-09-30
Claude Sonnet 4.5
2025-01-31
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
2 providers
Anthropic
Throughput: 42 tok/s
Latency: 0.4ms
ZeroEval
Throughput: 42 tok/s
Latency: 0.4ms
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Claude Sonnet 4.5
Avg Score:77.2%(+2.7%)
Providers:2
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GPT-5 Codex
Avg Score:74.5%
Providers:0