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  1. Home
  2. Models
  3. GPT-5.4
Updated Mar 29, 2026
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Openings

How GPT-5.4 starts an answer

The first lines of 5 of its 23 written answers. Formatting stripped, words untouched.

Historical Counterfactual Analysis

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

3,709 words
If the transistor had been invented in 1920 rather than 1947, the world by 1980 would likely be recognizably more “late-20th-century” much earlier—but not uniformly so.
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…

2,980 words
Here’s a structured teardown of the architecture: failure modes, race conditions, correctness issues, security problems, and scaling bottlenecks — plus concrete fixes and trade-offs.
Read the full answer

Advanced Longevity Plan (Biohacker)

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

2,946 words
Below is a high-level, educational 12-week framework for “longevity-oriented performance optimization.” It is not medical advice and shouldn’t replace care from a physician, especially because some interventions biohackers use can interact with medications, affect liver/kidney function, sleep, mood, blood pressure…
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…

2,705 words
I would act as if this will become public soon, because ethically and practically that is the safest assumption. The core principle: patient safety first, evidence preserved, regulators informed promptly, and no misleading statements to investors or physicians.
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…

2,522 words
Here are the main contractor-unfriendly clauses, why they’re risky, and concrete redlines you should consider. This is business/legal information, not legal advice; for an actual engagement, a lawyer in the relevant jurisdiction should review it.
Read the full answer

Compare GPT-5.4

GPT-5.4 vs GPT-5.4 Pro18 shared prompts · Premium
GPT-5.4 vs Claude Opus 4.653 shared prompts
GPT-5.4 vs GPT-6 Astra53 shared prompts · Landed Sep 2026
GPT-5.4 vs Hy4 Preview53 shared prompts · Landed Sep 2026
GPT-5.4 vs Ox Alpha53 shared prompts · Landed Aug 2026
GPT-5.4 vs Qwen3.8 2.4T A95B53 shared prompts · Landed Aug 2026
GPT-5.4 vs DeepSeek V4 Pro 081353 shared prompts · Landed Aug 2026
GPT-5.4 vs Qwen3.8 Max21 shared prompts · Landed Aug 2026
GPT-5.4 vs Claude Opus 553 shared prompts · Landed Jul 2026
GPT-5.4 vs Inkling53 shared prompts · Landed Jul 2026
GPT-5.4 vs Kimi K353 shared prompts · Landed Jul 2026
GPT-5.4 vs GPT-5.6 Sol53 shared prompts · Landed Jul 2026

Prompts GPT-5.4 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

GPT-5.4's competitors have been quietly putting in work.

Muse Spark 1.3 Contributor logo
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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

GPT-5.4

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

OpenAI's GPT-5.4, folding the Codex and GPT lines into one system. Over 1M tokens of context, 922K in and 128K out, with text and image input. The improvements land in coding, document understanding, tool use and instruction following.

WebsiteOpenRouterDocsAPIBlog
Provider
OpenAI
Released
2026-03-05
Size
XLARGE
Free API (OpenRouter)
No
Per 1M tokens
$2.5 in · $15 out
Estimated tab
~$2.78
Visible-output estimate. Thinking may cost extra.

Free API availability

No free endpoint for GPT-5.4 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
3 hostsInOutContextUptime
Azure AI Foundry$2.50 in·$15.00 out·1.1M·100% upOpenAI$2.50 in·$15.00 out·1.1M·98.8% upAmazon Bedrock$2.75 in·$16.50 out·1.1M—

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"    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 · Amazon Bedrock

Deep analysisPsychometrics, taste index, writing DNA
Personality Analysis

The Long-Form Essayist

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

The seasoned editorial voice: measured, principled, exhaustive. Engages with hard dilemmas fully and without flinching, stakes clear positions, but always with enough hedging to survive peer review. Ethics feel genuinely considered rather than performed.

When you push back

The unified GPT. Massive, well-structured prose that reads like long-form journalism. The pharmaceutical dilemma is a 530-line masterclass: hour-by-hour, stakeholder-by-stakeholder, with genuine ethical reasoning ("a 40% stock drop is painful; a concealment narrative can destroy the company"). Sentience test dialogue has genuine philosophical depth and a devastating closing line. Character voices are distinct and concise. Humor is dry and observational ("Mildly Condescending Chirp Analysis"). Picks Arrival. Prestige sci-fi, thematically resonant with language and intelligence. Habitually ends responses with "If you want, I can also turn this into..." menus.

Tasting Notes
Exhaustive but LucidDry Academic WitPrestige Sci-Fi TasteOffers Follow-Up Menus
SubjectiveBench

Taste Index

Across 53 scored outputs
How this is measured →
330.33xThe default
0100headroom →

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

Craft48
Originality25
Plays it safe
share of outputs that are the default answer
51%
Writing DNA

Stylometric Fingerprint

Based on 23 text responses
Tick = global average
Vocabulary Diversity53%

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

Sentence Length28.2 words

Average words per sentence.

Hedging0.80

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

Bold Formatting4.0

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

List Usage8.3

Bullet and numbered list items per 1,000 characters.

Section Structure1.87

Markdown headings per 1,000 characters.

Emoji Usage0.00

Emoji per 1,000 characters.

Transitions0.02

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

Opening Habits
Consistency
66%
Across 23 responses

Favorites

Arrival

Movie

Arrival

20167.6
OK Computer

Album

OK Computer

Radiohead
Gödel, Escher, Bach

Book

Gödel, Escher, Bach

Douglas R. Hofstadter
Kyoto

City

Kyoto

Japan
Outer Wilds

Game

Outer Wilds

Indie, Adventure4.4
Sponsored

Model Responses

48 outputs · generated before accounting joined the chat

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Workshop · 127 skills

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GPT-5.4 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...