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Model Comparison

Comprehensive side-by-side analysis of model capabilities and performance

OpenAI

GPT-5 Codex

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.

OpenAI

o3

OpenAI

o3 is a multimodal language model developed by OpenAI. It achieves strong performance with an average score of 67.5% across 22 benchmarks. It excels particularly in COLLIE (98.4%), AIME 2024 (91.6%), ARC-AGI (88.0%). It supports a 300K 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.

OpenAI

o3

OpenAI

2025-04-16

OpenAI

GPT-5 Codex

OpenAI

2025-09-15

5 months newer

Performance Metrics

Context window and performance specifications

OpenAI

GPT-5 Codex

Max Context:-
OpenAI

o3

Larger context
Max Context:300.0K

Average performance across 1 common benchmarks

OpenAI

GPT-5 Codex

+5.4%
Average Score:74.5%
OpenAI

o3

Average Score:69.1%

Performance comparison across key benchmark categories

OpenAI

GPT-5 Codex

general
+3.4%
74.5%
OpenAI

o3

general
71.1%
Benchmark Scores - Detailed View
Side-by-side comparison of all benchmark scores
Knowledge Cutoff
Training data recency comparison

o3

2024-05-31

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

OpenAI

GPT-5 Codex

0 providers
OpenAI

o3

1 providers

OpenAI

Throughput: 50 tok/s
Latency: 20ms
OpenAI

GPT-5 Codex

+5.4%
Avg Score:74.5%
Providers:0
OpenAI

o3

Avg Score:69.1%
Providers:1