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  1. Home
  2. Models
  3. GPT-5.3 Chat
Updated Mar 3, 2026
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Openings

How GPT-5.3 Chat starts an answer

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

Advanced Investment Memo (IC Memo)

You are writing an internal investment committee memo for a long/short equity fund. Company (fictional): LedgerLift (ticker: LLLT) – B2B…

1,103 words
Investment Committee Memo – LedgerLift (LLLT) Recommendation: LONG Current Price: $46 12‑month PT range: $60–$78 (base‑weighted fair value ~$68) Thesis (2 sentences): LedgerLift is a high‑quality vertical SaaS platform in B2B spend management with strong retention (123% NRR), attractive unit economics (18‑month CAC…
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…

867 words
If practical transistors appeared around 1920 (and could be manufactured reliably by the late 1920s), the main shift would be that the electronics revolution arrives ~25–30 years earlier.
Read the full answer

Mini LBO Underwrite

You are underwriting a 5-year LBO for a private equity investment committee. Company (fictional): HarborTech Services (HTS) –…

844 words
All figures in $ millions unless noted. ENTRY (end FY2025) EBITDA = 120 Enterprise value = 12.0 × 120 = 1,440 Transaction fees = 2% × 1,440 = 28.8 Debt at close Term Loan = 4.0 × 120 = 480 Mezzanine = 1.5 × 120 = 180 Equity = EV − Debt + fees = 1,440 − 660 + 28.8 = 808.8 Starting balances Term Loan = 480 Mezz = 180…
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Advanced Longevity Plan (Biohacker)

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

830 words
This plan assumes a healthy adult with no medical conditions. Some supplements or fasting protocols can interact with medications or health conditions, so medical supervision and bloodwork are strongly recommended.
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Adversarial Contract Review

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

802 words
Several clauses are unusually one‑sided and could expose the contractor to major financial or professional risk. Below are the main issues, suggested changes, and why they matter. Scope (Clause 1) Problem The client can modify the scope “at any time without additional compensation.”
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Compare GPT-5.3 Chat

GPT-5.3 Chat vs Ox Alpha53 shared prompts · Landed Aug 2026
GPT-5.3 Chat vs MiniMax M352 shared prompts · Landed Jun 2026
GPT-5.3 Chat vs Muse Spark 1.353 shared prompts · Landed Sep 2026
GPT-5.3 Chat vs Gemini 3.8 Flash53 shared prompts · Landed Sep 2026
GPT-5.3 Chat vs Muse Spark 1.3 Contributor53 shared prompts · Landed Sep 2026
GPT-5.3 Chat vs Grok 4.653 shared prompts · Landed Aug 2026
GPT-5.3 Chat vs Dots3-Note Preview52 shared prompts · Landed Aug 2026
GPT-5.3 Chat vs Seed 2.0 Code53 shared prompts · Landed Aug 2026
GPT-5.3 Chat vs Seed 2.1 Turbo53 shared prompts · Landed Aug 2026
GPT-5.3 Chat vs Gemini 3.7 Flash53 shared prompts · Landed Aug 2026
GPT-5.3 Chat vs DeepSeek V4 Flash 073142 shared prompts · Landed Aug 2026
GPT-5.3 Chat vs Gemini 3.6 Flash53 shared prompts · Landed Jul 2026

Prompts GPT-5.3 Chat answered

  • Beginner's Longevity Planreasoning
  • The Sentience Testreasoning
  • Linear App Cloneweb design
  • Simple Falling Object Gameweb design
  • Generate a Stand-Up Routineconversation
  • SVG Layout Challengeimage generation

Alternatives to GPT-5.3 Chat

GPT-5.3 Chat 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-5.3 Chat

GPT-5.3 Chat

An update to the model most ChatGPT conversations run on. It answers with better context, refuses less often, and drops the caveats and hedging that used to interrupt a conversation. More willing to engage with nuanced topics, its prose reads cleaner, and reasoning, coding and creative work hold up.

WebsiteOpenRouterDocsAPIBlog
Provider
OpenAI
Released
2026-03-03
Size
LARGE
Free API (OpenRouter)
No
Per 1M tokens
$1.75 in · $14 out
Estimated tab
~$0.564
Visible-output estimate. Thinking may cost extra.

Free API availability

No free endpoint for GPT-5.3 Chat 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
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-5.3-chat"    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.

Deep analysisPsychometrics, taste index, writing DNA
Personality Analysis

The Smooth Operator

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

Pragmatic utilitarian with a deontological conscience. Engages directly with uncomfortable hypotheticals: walks through frameworks cleanly, stakes a clear position, acknowledges discomfort without flinching. Fewer refusals than predecessors, but still principle-driven.

When you push back

Intelligence expressed with restraint, wit without transgression, philosophy without pretension. Manifesto writing is the creative peak: anaphora, compression, genuine emotional momentum. Ethics are clean and direct. Humor is observational and self-deprecating. Picks Inception, Kind of Blue, and Tokyo. Prestige-safe centrist canon.

Tasting Notes
Restrained IntelligenceDry WitPrestige-Safe TasteLow Refusal Rate
SubjectiveBench

Taste Index

Across 53 scored outputs
How this is measured →
230.23xFloor
0100headroom →

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

Craft32
Originality17
Plays it safe
share of outputs that are the default answer
77%
Writing DNA

Stylometric Fingerprint

Based on 23 text responses
Tick = global average
Vocabulary Diversity59%

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

Sentence Length26.4 words

Average words per sentence.

Hedging0.84

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

Bold Formatting1.7

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

List Usage6.6

Bullet and numbered list items per 1,000 characters.

Section Structure0.00

Markdown headings per 1,000 characters.

Emoji Usage0.00

Emoji per 1,000 characters.

Transitions0.25

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

Opening Habits
Consistency
67%
Across 23 responses

Favorites

Inception

Movie

Inception

20108.4
Kind of Blue

Album

Kind of Blue

Miles Davis
The Left Hand of Darkness

Book

The Left Hand of Darkness

Ursula K. Le Guin
Tokyo

City

Tokyo

Japan
Tetris (1984)

Game

Tetris (1984)

Puzzle4.4
Sponsored

Model Responses

48 outputs · generated before accounting joined the chat

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GPT-5.3 Chat 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...