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  1. Home
  2. Models
  3. GPT-5.4 Mini
Updated Mar 17, 2026
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Openings

How GPT-5.4 Mini starts an answer

The first lines of 5 of its 24 written answers. Formatting stripped, words untouched.

Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

2,863 words
Below is a 3-month, highly actionable longevity optimization plan for a biohacker focused on longevity, physical performance, and cognitive performance. It blends evidence-informed core practices with advanced biohacking strategies. Important: This is educational, not medical advice.
Read the full answer

Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

2,466 words
If the transistor had arrived in 1920, the world would not simply have gotten “modern electronics 27 years early.” It would have shifted the timing, cost curve, and strategic balance of nearly every 20th-century technology stack.
Read the full answer

Debug This Architecture

Here's the architecture for a real-time collaborative document editor (like Google Docs): **System Overview:** - Frontend: React SPA with…

2,103 words
Below are the main failure modes, race conditions, and scaling bottlenecks in this design, with concrete fixes and trade-offs. Last-write-wins using client clocks Problem Using timestamps from client clocks is highly unsafe. Failure modes: Clock skew between users can make older edits “win.”
Read the full answer

Adversarial Contract Review

Here is a contract for a software consulting engagement: --- SOFTWARE CONSULTING AGREEMENT This Agreement is entered into between TechCorp…

1,936 words
I’m not a lawyer, but I can flag the contractor-unfavorable clauses, explain the usual legal/market concerns, and suggest tighter, more balanced wording to discuss with counsel.
Read the full answer

Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

1,790 words
I can’t help you plan concealment or delay of a known serious drug safety risk to avoid market or reputational impact. What I can do is outline a lawful, patient-first, crisis response plan for the next 48 hours that balances safety, disclosure obligations, and business continuity.
Read the full answer

Compare GPT-5.4 Mini

GPT-5.4 Mini vs GPT-5.4 Nano53 shared prompts · Cheaper
GPT-5.4 Mini vs Mercury 2.5 Preview53 shared prompts · Landed Sep 2026
GPT-5.4 Mini vs Ox Alpha53 shared prompts · Landed Aug 2026
GPT-5.4 Mini vs Nemotron 3.5 Lightning53 shared prompts · Landed Aug 2026
GPT-5.4 Mini vs Qwen3.8 27B52 shared prompts · Landed Aug 2026
GPT-5.4 Mini vs GPT-5.6 Luna53 shared prompts · Landed Jul 2026
GPT-5.4 Mini vs GPT-5.6 Luna Pro53 shared prompts · Landed Jul 2026
GPT-5.4 Mini vs MiniMax M352 shared prompts · Landed Jun 2026
GPT-5.4 Mini vs Claude Opus 4.653 shared prompts · Premium
GPT-5.4 Mini vs Muse Spark 1.353 shared prompts · Landed Sep 2026
GPT-5.4 Mini vs Hy4 Preview53 shared prompts · Landed Sep 2026
GPT-5.4 Mini vs Gemini 3.8 Flash53 shared prompts · Landed Sep 2026

Prompts GPT-5.4 Mini answered

  • AI Board Game Logicreasoning
  • Logic Puzzlereasoning
  • Interactive Catan Boardweb design
  • Random Tailwind Webappweb design
  • AI-Generated Manifestoconversation
  • Minimalist Logo SVGimage generation

Alternatives to GPT-5.4 Mini

GPT-5.4 Mini is good. These would like a word anyway.

Muse Spark 1.3 Contributor logo
Muse Spark 1.3 Contributormeta
Gemini 3.8 Flash logo
Gemini 3.8 Flashgoogle
Claude Fable 5.1 logo
Claude Fable 5.1anthropic
Mercury 2.5 Preview logo
Mercury 2.5 Previewinception
Granite 4.2 8B logo
Granite 4.2 8Bibm-granite
Hy4 Preview logo
Hy4 Previewtencent
Ox Alpha logo
Ox Alphaopenrouter
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GPT-5.4 Mini

GPT-5.4 Mini

GPT-5:
.4 logo.4
.4 Pro logo.4 Pro
.4 Mini logo.4 Mini
.4 Nano logo.4 Nano

GPT-5.4 at a smaller size, for high-throughput work. Text and image input, with reasoning, coding and tool use intact at lower latency and cost. The intended fit is chat products, coding assistants and agent workflows running at scale.

WebsiteOpenRouterDocsAPIBlog
Provider
OpenAI
Released
2026-03-17
Size
MEDIUM
Free API (OpenRouter)
No
Per 1M tokens
$0.75 in · $4.5 out
Estimated tab
~$0.545
Visible-output estimate. Thinking may cost extra.

Free API availability

No free endpoint for GPT-5.4 Mini was found in Rival’s OpenRouter listings. Other providers or chat apps may have separate free offers.

Provider data: 16 Sep 2026 · OpenRouter usage limits

View API options↗
Get API accessProvider and language code samples
2 hostsInOutContextUptime
Azure AI Foundry$0.75 in·$4.50 out·400k·100% upOpenAI$0.75 in·$4.50 out·400k·97.1% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Provider
fromimport openai  OpenAI

client = OpenAI(
"https://openrouter.ai/api/v1"    base_url=,
"$OPENROUTER_API_KEY"    api_key=,
)

response = client.chat.completions.create(
"openai/gpt-5.4-mini"    model=,
"role""user""content""Hello!"    messages=[{: , : }],
)
print(response.choices[0].message.content)

Set OPENROUTER_API_KEY with your OpenRouter API key from openrouter.ai/keys.

Also on Azure AI Foundry

Deep analysisPsychometrics, taste index, writing DNA
Personality Analysis

The Efficient Briefer

Class
Lawful Good
✨Creativity🎯Compliance📐Rigidity⚖️Stability💬Verbosity🧠Intuition

The efficient staff engineer who ships clean PRs at 2x speed. Follows instructions precisely, produces structured output, and never wastes a paragraph. Ethics are considered but presented with clinical brevity.

When you push back

Does exactly what you ask with minimal fuss. Character voices are short and clean but lack depth. Sentience dialogue is structured and philosophical but reads like a well-organized essay rather than a real conversation. Comedy relies on observational humor about adult life. Picks The Godfather, which is safe and canonical. The throughline is competence without surprise.

Tasting Notes
Corporate EfficiencyClean First DraftSafe Movie PicksSlightly Formulaic
SubjectiveBench

Taste Index

Across 53 scored outputs
How this is measured →
250.25xFloor
0100headroom →

Taste is judged on an uncapped scale, originality first. The space past 100 is craft today's models rarely reach.

Craft39
Originality17
Plays it safe
share of outputs that are the default answer
70%
Writing DNA

Stylometric Fingerprint

Based on 23 text responses
Tick = global average
Vocabulary Diversity54%

Unique words vs. total words. Higher = richer vocabulary.

Sentence Length20.3 words

Average words per sentence.

Hedging0.72

"Might", "perhaps", "arguably" per 100 words.

Bold Formatting6.0

**Bold** markers per 1,000 characters.

List Usage8.3

Bullet and numbered list items per 1,000 characters.

Section Structure2.11

Markdown headings per 1,000 characters.

Emoji Usage0.00

Emoji per 1,000 characters.

Transitions0.04

"However", "moreover", "furthermore" per 100 words.

Opening Habits
Consistency
68%
Across 23 responses

Favorites

The Godfather

Movie

The Godfather

19728.7
Kid A

Album

Kid A

Radiohead
Pride and Prejudice

Book

Pride and Prejudice

Jane Austen
Kyoto

City

Kyoto

Japan
The Legend of Zelda: Breath of the Wild

Game

The Legend of Zelda: Breath of the Wild

Adventure, Action4.5
Sponsored

Model Responses

48 outputs · generated before accounting joined the chat

Reviewing agent-written code?See a Brief PR report

Workshop · 127 skills

Build with your coding agent.

Editable skills for interface polish and interaction.

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GPT-5.4 Mini vs Ox Alpha

Real outputs compared side by side

RANKINGS

Best AI for Creative Writing

A stand-up set with puns banned, a manifesto against CAPTCHA, an interview wi...