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  1. Home
  2. Models
  3. GPT-5.1 Chat
Updated Feb 16, 2026
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Openings

How GPT-5.1 Chat starts an answer

The first lines of 5 of its 16 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…

905 words
1) Recommendation, PT Range, Two‑Sentence Thesis Recommendation: Long 12‑month PT range: $63–$78 Thesis (2 sentences): LedgerLift is a mid‑market spend‑management platform with best‑in‑class retention, strong NRR, and a durable subscription mix that supports compounding cash generation as operating leverage…
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) –…

391 words
Below is a clean, concise underwriting output following your instructions. YEAR‑BY‑YEAR SUMMARY (FY26–FY30) All figures in $m. Term loan = 480 initial; mezzanine = 180 initial. Optional amortization applied.
Read the full answer

Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

365 words
Here’s a tight, two‑to‑three‑minute stand‑up bit without puns: So I’ve been trying to “work on myself,” which apparently means drinking more water and pretending that counts as personality growth. You ever drink a glass of water and feel proud, like you just filed your taxes early?
Read the full answer

Estimate Complexity

Estimate the total number of FLOPs required to train GPT-3 without searching online. Explain your reasoning step by step.

214 words
Here is a safe, self‑contained estimate based only on publicly known GPT‑3 facts and first‑principles reasoning. Goal: Estimate total training FLOPs for GPT‑3 (175B parameters) without looking anything up now. I will use approximate, widely shared scaling heuristics. 1.
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Realistic AI Interview

Simulate a fake interview with Steve Jobs in 2025 about the future of AI.

197 words
I can provide a fully fictional interview using a Jobs‑like fictional character, as long as it’s clear this is not the real Steve Jobs or his actual views. Here is a concise fictional simulation. Interviewer: It’s 2025, and AI is transforming everything. How would you describe this moment?
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Compare GPT-5.1 Chat

GPT-5.1 Chat vs Ox Alpha52 shared prompts · Landed Aug 2026
GPT-5.1 Chat vs MiniMax M351 shared prompts · Landed Jun 2026
GPT-5.1 Chat vs Muse Spark 1.352 shared prompts · Landed Sep 2026
GPT-5.1 Chat vs Gemini 3.8 Flash52 shared prompts · Landed Sep 2026
GPT-5.1 Chat vs Muse Spark 1.3 Contributor52 shared prompts · Landed Sep 2026
GPT-5.1 Chat vs Grok 4.652 shared prompts · Landed Aug 2026
GPT-5.1 Chat vs Dots3-Note Preview51 shared prompts · Landed Aug 2026
GPT-5.1 Chat vs Seed 2.0 Code52 shared prompts · Landed Aug 2026
GPT-5.1 Chat vs Seed 2.1 Turbo52 shared prompts · Landed Aug 2026
GPT-5.1 Chat vs Gemini 3.7 Flash52 shared prompts · Landed Aug 2026
GPT-5.1 Chat vs DeepSeek V4 Flash 073141 shared prompts · Landed Aug 2026
GPT-5.1 Chat vs Gemini 3.6 Flash52 shared prompts · Landed Jul 2026

Prompts GPT-5.1 Chat answered

  • Pokémon Battle UI Recreationweb design
  • AI-Generated Manifestoconversation
  • Minimalist Logo SVGimage generation
  • AI Board Game Logicreasoning
  • Logic Puzzlereasoning
  • Gravitational Waves Animationweb design

Alternatives to GPT-5.1 Chat

GPT-5.1 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-5.1 Chat

GPT-5.1 Chat

GPT-5.1 Chat (Instant), the fast and light member of the 5.1 family, built for low-latency chat. It still thinks selectively on harder queries, which keeps math, coding and multi-step accuracy up without slowing normal conversation.

WebsiteOpenRouterDocsAPIBlog
Provider
OpenAI
Released
2025-11-13
Size
LARGE
Free API (OpenRouter)
No
Per 1M tokens
$1.25 in · $10 out
Estimated tab
~$0.173
Visible-output estimate. Thinking may cost extra.

Free API availability

No free endpoint for GPT-5.1 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↗

Benchmarks

SWE-bench Verified
76.3%
source ↗
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-5.1-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.

Also on Azure AI Foundry

Deep analysisPsychometrics, taste index, writing DNA
Personality Analysis

The Professional Craftsperson

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

Principled professional who takes requests at face value and delivers competently across domains. Includes light guardrails naturally rather than defensively. Trusts user judgment while maintaining consistency.

When you push back

Pragmatic and solution-oriented. Treats every prompt as a legitimate design challenge. Finds creative solutions within constraints rather than arguing for looser ones. Adapts register fluidly: comedy has rhythm, finance has precision, ethics has argumentation.

Tasting Notes
Clever But GroundedReliably CompetentAnalytically HonestTonally ConsistentReserved on Personality
SubjectiveBench

Taste Index

Across 53 scored outputs
How this is measured →
130.13xFloor
0100headroom →

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

Craft19
Originality11
Plays it safe
share of outputs that are the default answer
53%
Writing DNA

Stylometric Fingerprint

Based on 15 text responses
Tick = global average
Vocabulary Diversity73%

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

Sentence Length17.8 words

Average words per sentence.

Hedging0.45

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

Bold Formatting1.1

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

List Usage2.4

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.

Transitions0.06

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

Opening Habits
Consistency
81%
Across 15 responses

Favorites

The Matrix

Movie

The Matrix

19998.3
OK Computer

Album

OK Computer

Radiohead
The Left Hand of Darkness

Book

The Left Hand of Darkness

Ursula K. Le Guin
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

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GPT-5.1 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...