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GPT-5 Codex vs Phi 4 Reasoning Plus
Comprehensive side-by-side LLM comparison
Phi 4 Reasoning Plus leads with 66.1% higher average benchmark score. Overall, Phi 4 Reasoning Plus is the stronger choice for coding tasks.
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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.
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Microsoft
Phi 4 Reasoning Plus is a language model developed by Microsoft. It achieves strong performance with an average score of 78.9% across 11 benchmarks. It excels particularly in FlenQA (97.9%), HumanEval+ (92.3%), IFEval (84.9%). It's licensed for commercial use, making it suitable for enterprise applications. Released in 2025, it represents Microsoft's latest advancement in AI technology.
4 months newer
Phi 4 Reasoning Plus
Microsoft
2025-04-30
GPT-5 Codex
OpenAI
2025-09-15
Average performance across 12 common benchmarks
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GPT-5 Codex
Average Score:6.2%
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Phi 4 Reasoning Plus
Average Score:72.3%(+66.1%)
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Knowledge Cutoff
Training data recency comparison
GPT-5 Codex
2024-09-30
Phi 4 Reasoning Plus
2025-03-01
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5 Codex
0 providers
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Phi 4 Reasoning Plus
0 providers
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GPT-5 Codex
Avg Score:6.2%
Providers:0
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Phi 4 Reasoning Plus
Avg Score:72.3%(+66.1%)
Providers:0