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Best models for Codex

Codex only runs OpenAI models, so the real choice is which GPT tier fits your work. Here's how the three options in the picker compare on capability and cost.

The ranking
Updated June 2026
#ModelContextInput
  • 1
    1OpenAI
    GPT-5.5OpenAIThe flagship pick for hard tasks and long agentic runs.
    Context1.05M
    Input$5/M
  • 2
    2OpenAI
    GPT-5.4OpenAIThe everyday default: strong coding at half the flagship price.
    Context1.05M
    Input$2.5/M
  • 3
    3OpenAI
    GPT-5.4 MiniOpenAICheap and fast for routine edits and high-volume runs.
    Context400K
    Input$0.75/M
Intelligence vs. price

Each model's Artificial Analysis Intelligence Index logoArtificial Analysis Intelligence Index score against its blended price per 1M tokens. Toward the top right is more intelligence per dollar.

Full interactive leaderboard on our Intelligence Index page.

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  • Agent

    Codex logoCodex

  • Models

    3

  • Updated

    June 2026
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