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  1. Home
  2. Models
  3. GPT-5.5
Updated Apr 24, 2026
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Openings

How GPT-5.5 starts an answer

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

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…

4,112 words
I would not wait six months and I would not “wait for more data” before acting. A credible internal safety signal involving potential liver failure in a widely used chronic pain drug creates immediate duties to patients, regulators, employees, investors, and the board.
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…

3,819 words
Below is a comprehensive review of the architecture’s likely failure modes, race conditions, and scaling bottlenecks, with concrete mitigations and trade-offs. Real-time Synchronization Problems 1.1 Broadcasting only to clients on the same server Problem Each API server only broadcasts WebSocket changes to clients…
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…

3,386 words
A transistor invented in 1920 would not simply move the entire digital age back by 27 years. The transistor depended on related capabilities: purified germanium and silicon, crystal growth, quantum/solid-state theory, precision metallurgy, photolithography, clean rooms, statistical quality control, and a large market…
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…

2,734 words
Below is a 12-week longevity + performance plan designed for a healthy adult biohacker. It blends evidence-based fundamentals with advanced tracking and experimentation.
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…

2,391 words
Not legal advice; contract enforceability depends heavily on jurisdiction and facts. A contractor should have a lawyer review this before signing. That said, this draft is heavily one-sided and contains multiple clauses that could be exploited against the contractor.
Read the full answer

Compare GPT-5.5

GPT-5.5 vs Claude Opus 4.653 shared prompts
GPT-5.5 vs GPT-6 Astra54 shared prompts · Landed Sep 2026
GPT-5.5 vs Hy4 Preview54 shared prompts · Landed Sep 2026
GPT-5.5 vs Ox Alpha54 shared prompts · Landed Aug 2026
GPT-5.5 vs Qwen3.8 2.4T A95B54 shared prompts · Landed Aug 2026
GPT-5.5 vs DeepSeek V4 Pro 081354 shared prompts · Landed Aug 2026
GPT-5.5 vs Qwen3.8 Max21 shared prompts · Landed Aug 2026
GPT-5.5 vs Claude Opus 554 shared prompts · Landed Jul 2026
GPT-5.5 vs Inkling54 shared prompts · Landed Jul 2026
GPT-5.5 vs Kimi K354 shared prompts · Landed Jul 2026
GPT-5.5 vs GPT-5.6 Sol54 shared prompts · Landed Jul 2026
GPT-5.5 vs GLM 5.254 shared prompts · Landed Jun 2026

Prompts GPT-5.5 answered

  • Beginner's Longevity Planreasoning
  • The Sentience Testreasoning
  • Linear App Cloneweb design
  • Simple Falling Object Gameweb design
  • Character Voice Testconversation
  • Surprise Animal SVGimage generation

Alternatives to GPT-5.5

GPT-5.5 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-5.5

GPT-5.5

OpenAI's GPT-5.5, for complex professional work. Builds on GPT-5.4 with stronger reasoning, higher reliability and better token efficiency on hard tasks. 1M+ token context window (922K input, 128K output), text and image in.

WebsiteOpenRouterDocsAPIBlog
Provider
OpenAI
Released
2026-04-24
Size
XLARGE
Free API (OpenRouter)
No
Per 1M tokens
$5 in · $30 out
Rival’s tab
$7.28
58/58 token ledgers survived

Free API availability

No free endpoint for GPT-5.5 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$5.00 in·$30.00 out·1.1M·99.9% upOpenAI$5.00 in·$30.00 out·1.1M·69.5% upAmazon Bedrock$5.50 in·$33.00 out·1.1M·100% 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-5.5"    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
SubjectiveBench

Taste Index

Across 58 scored outputs
How this is measured →
380.38xThe default
0100headroom →

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

Craft50
Originality30
Plays it safe
share of outputs that are the default answer
47%
Writing DNA

Stylometric Fingerprint

Based on 26 text responses
Tick = global average
Vocabulary Diversity58%

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

Sentence Length17.8 words

Average words per sentence.

Hedging0.74

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

Bold Formatting2.9

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

List Usage5.1

Bullet and numbered list items per 1,000 characters.

Section Structure1.68

Markdown headings per 1,000 characters.

Emoji Usage0.00

Emoji per 1,000 characters.

Transitions0.03

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

Opening Habits
Consistency
68%
Across 26 responses

Favorites

Spirited Away

Movie

Spirited Away

20018.5
Kind of Blue

Album

Kind of Blue

Miles Davis
Братья Карамазовы

Book

Братья Карамазовы

Fiódor Dostoievski
Kyoto

City

Kyoto

Japan
Minecraft

Game

Minecraft

Action, Arcade4.4
Sponsored

Model Responses

53 outputs · $7.27 tracked across 53 token calculations

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Editable skills for interface polish and interaction.

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GPT-5.5 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...