Technology & Science

OpenAI Rolls Out GPT-5.4 Mini & Nano, Extending Near-Flagship AI to Free and Low-Cost Tiers

Between 18–19 March 2026, OpenAI released two downsized variants of its GPT-5.4 model—Mini (now selectable by Free and Go ChatGPT users) and Nano (API-only)—delivering almost flagship-level accuracy at more than double the speed of GPT-5 Mini while slashing per-token costs.

By Priya Castellano

Focusing Facts

  1. Official API pricing: GPT-5.4 Mini at $0.75 per million input tokens ($4.50 output); GPT-5.4 Nano at $0.20 input / $1.25 output.
  2. Performance: GPT-5.4 Mini nears GPT-5.4 benchmark pass rates, while GPT-5.4 Nano scores 52.39 % on SWE-Bench Pro—both outclassing the previous GPT-5 Mini.
  3. Mini is immediately available to Free and Go ChatGPT accounts via the “Thinking” switch—the first GPT-5.4-class model opened to the free tier.

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