+
+
+
+
+
+
+
+
VS
VS
VS
VS
VS
VS
GPT-5 Codex vs o1
Comprehensive side-by-side LLM comparison
o1 leads with 67.7% higher average benchmark score. o1 is available on 2 providers. Overall, o1 is the stronger choice for coding tasks.
+
+
+
+
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
o1 is a language model developed by OpenAI. It achieves strong performance with an average score of 71.6% across 19 benchmarks. It excels particularly in GSM8k (97.1%), MATH (96.4%), GPQA Physics (92.8%). It supports a 300K token context window for handling large documents. The model is available through 2 API providers. Released in 2024, it represents OpenAI's latest advancement in AI technology.
9 months newer
o1
OpenAI
2024-12-17
GPT-5 Codex
OpenAI
2025-09-15
Performance Metrics
Context window and performance specifications
Average performance across 19 common benchmarks
+
+
+
+
GPT-5 Codex
Average Score:3.9%
+
+
+
+
o1
Average Score:71.6%(+67.7%)
+
+
+
+
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
+
+
+
+
GPT-5 Codex
0 providers
+
+
+
+
o1
2 providers
Azure
Throughput:
+
+
+
+
GPT-5 Codex
Avg Score:3.9%
Providers:0
+
+
+
+
o1
Avg Score:71.6%(+67.7%)
Providers:2