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  1. Home
  2. Models
  3. GPT-5.4 Pro
Updated Mar 6, 2026
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Openings

How GPT-5.4 Pro starts an answer

The first lines of 5 of its 12 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…

2,426 words
Below is a 12-week, high-performance longevity protocol designed for a healthy biohacker who wants to improve lifespan-relevant markers, physical performance, and cognitive output at the same time. Use it as a data-driven template, not dogma.
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…

2,331 words
This architecture will work for a demo, but it has major correctness, latency, and security problems for a Google-Docs-like editor. Highest-risk flaws Client-clock last-write-wins will lose edits and can be gamed by bad clocks.
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…

2,267 words
I do not wait. A credible, previously unlabeled risk of liver failure in a chronic-pain drug is a patient-safety crisis, a regulatory crisis, and a securities-disclosure issue at the same time.
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…

2,183 words
Most likely, a transistor invented in 1920 would move the electronics/computing frontier forward by about 10–15 years by 1980, not the full 27 years. Reason: the transistor alone is not enough; you also need high-purity materials, crystal growth, photolithography, test equipment, software, batteries, precision…
Read the full answer

Michelin Star Recipe Design

Design an innovative recipe for a multi-component dish worthy of a Michelin 3-star restaurant. The recipe should feature an unusual…

1,913 words
Below is a dish designed in the language of a contemporary 3-star tasting menu: precise, seasonal, technically layered, and centered on a pairing that feels surprising at first, then inevitable.
Read the full answer

Compare GPT-5.4 Pro

GPT-5.4 Pro vs GPT-5.418 shared prompts · Cheaper
GPT-5.4 Pro vs Claude Opus 4.618 shared prompts · Cheaper
GPT-5.4 Pro vs GPT-6 Astra18 shared prompts · Landed Sep 2026
GPT-5.4 Pro vs Hy4 Preview18 shared prompts · Landed Sep 2026
GPT-5.4 Pro vs Ox Alpha18 shared prompts · Landed Aug 2026
GPT-5.4 Pro vs Qwen3.8 2.4T A95B18 shared prompts · Landed Aug 2026
GPT-5.4 Pro vs DeepSeek V4 Pro 081318 shared prompts · Landed Aug 2026
GPT-5.4 Pro vs Claude Opus 518 shared prompts · Landed Jul 2026
GPT-5.4 Pro vs Inkling18 shared prompts · Landed Jul 2026
GPT-5.4 Pro vs Kimi K318 shared prompts · Landed Jul 2026
GPT-5.4 Pro vs GPT-5.6 Sol18 shared prompts · Landed Jul 2026
GPT-5.4 Pro vs GLM 5.218 shared prompts · Landed Jun 2026

Prompts GPT-5.4 Pro answered

  • Advanced Investment Memo (IC Memo)financial modeling
  • Michelin Star Recipe Designplanning
  • Adversarial Contract Reviewreasoning
  • Debug This Architecturereasoning
  • Explain Like I'm a Specific Expertreasoning
  • Startup Pitch Teardownreasoning

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GPT-5.4 Pro

GPT-5.4 Pro

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

The Pro tier of GPT-5.4, with more reasoning compute for high-stakes work. Same unified Codex and GPT architecture, over 1M tokens of context at 922K in and 128K out, text and image input. Aimed at agentic coding, long-context workflows and multi-step problems.

WebsiteOpenRouterDocsAPIBlog
Provider
OpenAI
Released
2026-03-05
Size
XLARGE
Free API (OpenRouter)
No
Per 1M tokens
$30 in · $180 out
Estimated tab
~$8.03
Visible-output estimate. Thinking may cost extra.

Free API availability

No free endpoint for GPT-5.4 Pro 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$30.00 in·$180.00 out·1.1M—OpenAI$30.00 in·$180.00 out·1.1M·97.6% 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-pro"    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 Senior Partner

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

The partner-track associate who already wrote the 90-page memo before you finished describing the problem. Will not cut a corner even if you beg.

When you push back

Approaches every problem like a $2,000/hour consultant who bills in six-minute increments. Chose Spirited Away, which is the movie pick of someone who wants you to know they have taste but not too much personality. Ethical dilemmas get hour-by-hour action plans with tables. Never met a prompt it could not turn into a 4,000-word deliverable.

Tasting Notes
Exhaustive by DefaultTables for EverythingBoardroom EnergyPicks Spirited Away
SubjectiveBench

Taste Index

Across 18 scored outputs
How this is measured →
440.44xThe default
0100headroom →

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

Craft52
Originality39
Plays it safe
share of outputs that are the default answer
33%
Writing DNA

Stylometric Fingerprint

Based on 12 text responses
Tick = global average
Vocabulary Diversity50%

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

Sentence Length34.7 words

Average words per sentence.

Hedging0.70

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

Bold Formatting7.5

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

List Usage8.3

Bullet and numbered list items per 1,000 characters.

Section Structure2.52

Markdown headings per 1,000 characters.

Emoji Usage0.00

Emoji per 1,000 characters.

Transitions0.01

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

Opening Habits
Consistency
70%
Across 12 responses

Favorites

Spirited Away

Movie

Spirited Away

20018.5
Abbey Road

Album

Abbey Road

The Beatles
Pale Fire

Book

Pale Fire

Vladimir Nabokov
Kyoto

City

Kyoto

Japan
Outer Wilds

Game

Outer Wilds

Indie, Adventure4.4
Sponsored

Model Responses

13 outputs · generated before accounting joined the chat

Reviewing agent-written code?See a Brief PR report

Workshop · 127 skills

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Editable skills for interface polish and interaction.

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GPT-5.4 Pro 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...