GPT-5.4 mini and nano

OpenAI | In Edition 26, Saturday 21 Mar 2026

The call on this one

DEPLOYif you run coding assistants or subagents

SOURCE OpenAI, Introducing GPT-5.4 mini and nano

GPT-5.4 mini and nano released. Mini hits SWE-Bench Pro 54.4% and OSWorld-Verified 72.1%, running more than 2x faster than GPT-5 mini. Nano costs $0.20 per 1M input tokens and $1.25 per 1M output tokens.

Added to The Deploy Log Monday 14 Sep 2026, updated Thursday 17 Sep 2026. Read Edition 26, the edition that carried it.

71 rows from OpenAI in The Deploy Log are dated on or before this one, this one included.

Before it from OpenAI: ChatGPT interactive learning, 7 days earlier. After it: Model Spec approach, 4 days later.

Week of March 16, 2026 | March 2026

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