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- Mar 18, 202695% CONFIDENCEfrom help.openai.com
GPT-5.4 mini Comes to ChatGPT
- GPT-5.4 mini came to ChatGPT on March 18, 2026: Free and Go users get it via "Thinking" in the + menu, and other users get it as a rate-limit fallback for GPT-5.4 Thinking[1][3]
- GPT-5 Thinking mini retires 30 days later[1]
Notable features
- OpenAI released GPT-5.4 mini and nano on March 17, 2026 as its most capable small models yet; mini is more than 2x faster than GPT-5 mini and approaches GPT-5.4 on SWE-Bench Pro (54.4% vs 57.7%) and OSWorld-Verified (72.1% vs 75.0%)[3]
- Built for latency-sensitive, high-volume work such as coding assistants, subagents and computer use from screenshots, it improves on GPT-5 mini across coding, reasoning, multimodal understanding and tool use; at xhigh effort it scores 60.0% on Terminal-Bench 2.0 (GPT-5 mini 38.2%) and 88.0% on GPQA Diamond (81.6%)[4]
- In the API it supports text and image inputs, tool use, function calling, web search, file search, computer use and skills, with up to 128,000 output tokens and an August 31, 2025 knowledge cutoff[2][4]
- API pricing: mini $0.75 input and $4.50 output per million tokens with a 400k context window; nano $0.20 and $1.25, API only[3]
- In Codex, mini uses 30% of the GPT-5.4 quota and can run as subagents[3]
References 489% CONFIDENCE
The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
- [1]95%OpenAI Model Release Notes: GPT-5.4 mini in ChatGPT (March 18, 2026)help.openai.com· Posted Sep 19, 2026· Starts Mar 18, 2026· 29% of score
OpenAI's[2][3] own model release notes date this entry March 18, 2026
- [2]90%GPT-5.4 Mini Model | OpenAI APIdevelopers.openai.com· Added Sep 22, 2026· 29% of score
OpenAI's[1][3] API model page for GPT-5.4 mini lists a 400,000 context window, 128,000 max output tokens and an Aug 31, 2025 knowledge cutoff.
- [3]85%Introducing GPT-5.4 mini and nanoopenai.com· Added Sep 19, 2026· Starts Mar 18, 2026· 29% of score
OpenAI's[1][2] announcement post, linked from the release note entry.
- [4]85%Introducing GPT-5.4 mini and nano | OpenAIweb.archive.org· Published Mar 17, 2026· 14% of score
Archived copy of OpenAI's[1][2][3] GPT-5.4 mini and nano launch post, with the benchmark table (Terminal-Bench 2.0 60.0% vs GPT-5 mini 38.2%, GPQA Diamond 88.0% vs 81.6%) and "supports text and image inputs, tool use, function calling, web search, file search, computer use, and skills".
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