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Feature Codex Models (e.g., GPT-5-Codex) Low-Reasoning (e.g., o3-mini "Low") High-Reasoning (e.g., o3 "High")
Excelled Tasks Code generation, refactoring, and API documentation. Simple logic checks, brainstorming, and fast summaries. Complex math, scientific research, and deep architectural debugging.
Speed / Time Fast: Near-instant "streaming" of code and text. Very Fast: Optimized for sub-second response times. Slow: Takes 10–60+ seconds to "think" before responding.
Cost Standard: Priced per standard input/output token. Economical: Uses minimal "reasoning tokens," making it cost-effective. Premium: Most expensive due to high "Chain of Thought" token usage.