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GPT-4.5 vs GPT-5 Codex
Comprehensive side-by-side LLM comparison
GPT-5 Codex leads with 36.5% higher average benchmark score. GPT-4.5 supports multimodal inputs. Overall, GPT-5 Codex is the stronger choice for coding tasks.
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OpenAI
GPT-4.5 was developed as an intermediate advancement between GPT-4 and GPT-5, designed to incorporate incremental improvements in reasoning, factuality, and instruction-following. Built to bridge generational capabilities while maintaining compatibility with existing applications, it represents a refinement of the GPT-4 architecture with enhanced performance characteristics.
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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.
6 months newer
GPT-4.5
OpenAI
2025-02-27
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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GPT-4.5
Average Score:38.0%
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GPT-5 Codex
Average Score:74.5%(+36.5%)
Performance comparison across key benchmark categories
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GPT-4.5
Coding38.0%
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GPT-5 Codex
Coding74.5%(+36.5%)
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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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GPT-4.5
1 providers
OpenAI
Throughput: 50 tok/s
Latency: 20ms
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GPT-5 Codex
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GPT-4.5
Avg Score:38.0%
Providers:1
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GPT-5 Codex
Avg Score:74.5%(+36.5%)
Providers:0