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GPT-4.5 vs GPT-5 Codex
Comprehensive side-by-side LLM comparison
GPT-4.5 leads with 60.4% higher average benchmark score. GPT-4.5 supports multimodal inputs. Overall, GPT-4.5 is the stronger choice for coding tasks.
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OpenAI
GPT-4.5 is a multimodal language model developed by OpenAI. It achieves strong performance with an average score of 63.1% across 27 benchmarks. It excels particularly in GSM8k (97.0%), MMLU (90.8%), CharXiv-D (90.0%). It supports a 132K token context window for handling large documents. The model is available through 1 API provider. As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2025, it represents OpenAI's latest advancement in AI technology.
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OpenAI
GPT-5 Codex is a language model developed by OpenAI. It achieves strong performance with an average score of 74.5% across 1 benchmarks. Notable strengths include SWE-Bench Verified (74.5%). Released in 2025, it represents OpenAI's latest advancement in AI technology.
6 months newer
GPT-4.5
OpenAI
2025-02-27
GPT-5 Codex
OpenAI
2025-09-15
Performance Metrics
Context window and performance specifications
Average performance across 27 common benchmarks
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GPT-4.5
Average Score:63.1%(+60.4%)
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GPT-5 Codex
Average Score:2.8%
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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:63.1%(+60.4%)
Providers:1
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GPT-5 Codex
Avg Score:2.8%
Providers:0