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Claude 3.5 Sonnet vs GPT-5 Codex
Comprehensive side-by-side LLM comparison
GPT-5 Codex leads with 25.5% higher average benchmark score. Claude 3.5 Sonnet supports multimodal inputs. Claude 3.5 Sonnet is available on 3 providers. Overall, GPT-5 Codex is the stronger choice for coding tasks.
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Anthropic
This upgraded version of Claude 3.5 Sonnet was released with significant improvements in coding and agentic tool use. Built to deliver enhanced performance in software engineering tasks, it brought substantial gains in reasoning and problem-solving while introducing the groundbreaking computer use capability in public beta, allowing it to interact with computer interfaces like a human.
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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.
10 months newer
Claude 3.5 Sonnet
Anthropic
2024-10-22
GPT-5 Codex
OpenAI
2025-09-15
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Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude 3.5 Sonnet
Average Score:49.0%
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GPT-5 Codex
Average Score:74.5%(+25.5%)
Performance comparison across key benchmark categories
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Claude 3.5 Sonnet
Coding49.0%
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GPT-5 Codex
Coding74.5%(+25.5%)
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Knowledge Cutoff
Training data recency comparison
GPT-5 Codex
2024-09-30
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 3.5 Sonnet
3 providers
Anthropic
Throughput: 100 tok/s
Latency: 0.5ms
Bedrock
Throughput: 101 tok/s
Latency: 0.5ms
Throughput: 42 tok/s
Latency: 0.4ms
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Claude 3.5 Sonnet
Avg Score:49.0%
Providers:3
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GPT-5 Codex
Avg Score:74.5%(+25.5%)
Providers:0