Expired50% confidenceFactExact time
The default model used by Codex CLI is GPT-5 Codex (Medium Reasoning).
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
Complete Guide to OpenAI Codex CLI Built-in Commands and Session Recovery
bilibili晟6668886/6/2026
Related Claims
UnverifiedThe Codex IDE extension uses the GPT-5 Codex (Medium Reasoning) model by default, which has strong reasoning capabilities but is relatively slow.84% similarUnverifiedCodex CLI currently supports the GPT-5 model and offers 4 different levels of thinking depth.82% similarUnverifiedThe course author uses the GPT 5.3 Codex model with high reasoning level enabled in Pi80% similarVerifiedThe Codex desktop client supports selecting the GPT-5.5 model.78% similar
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