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AI models · OpenAI

GPT-5.4 Mini: release date and what it's for

Released , according to OpenAI's announcement. The mid-size option on a 400K window. Luna undercuts it heavily, so read both prices before you pick.

Status
Live
Released
Lab
OpenAI
Input
$0.75per million tokens
Output
$4.50per million tokens
Context window
400Ktokens
Max output
128Ktokens

API model ID: gpt-5.4-mini

What we've written about GPT-5.4 Mini

September 23, 2026

Codex models and plans explained: GPT-6 Astra, Sol and Luna, and which plan gets which

Pick any GPT-6 model you like on your laptop, but a Codex cloud task on a ChatGPT plan still runs on last generation's Sol.

September 23, 2026

OpenAI model release dates: o3, GPT-5.5 and GPT-6 Astra, Sol and Luna in order

o3 is from April 2025, and the name Sol now means something different from what it meant in July.

How GPT-5.4 Mini compares on price and context

Price per million tokens

inputoutput

  1. GPT-6 Astra$10 / $50
  2. Claude Fable 5.1$10 / $50
  3. GPT-6 Sol$2 / $10
  4. GPT-5.4 Mini$0.75 / $4.50
  5. Muse Spark 1.3$1.25 / $4.25
  6. Gemini 3.8 Flash$0.75 / $3.75
  7. GPT-6 Luna$0.10 / $0.50
Context window, in tokens

how much it reads at once

  1. GPT-6 Sol1.05M
  2. GPT-6 Luna1.05M
  3. GPT-6 Astra1.05M
  4. Muse Spark 1.31.05M
  5. Gemini 3.8 Flash1.05M
  6. Claude Fable 5.11M
  7. GPT-5.4 Mini400K

Next to the newest OpenAI models and the current model from other labs. Prices are in US dollars per million tokens.

What is GPT-5.4 Mini?

GPT-5.4 Mini is a model from OpenAI, built in the US. It's out, and you can use it today.

When did GPT-5.4 Mini come out?

OpenAI released it on March 17, 2026. That date comes from OpenAI's announcement.

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GPT-5.5 Pro

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GPT-5.4 nano

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More news: OpenAI news and ChatGPT updates

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