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  5. GPT-2vsGPT-5.6 Luna Pro
Updated Jul 2026

GPT-2vsGPT-5.6 Luna Pro

GPT-5.6 Luna Pro has a larger context window than GPT-2 (1.1M tokens vs 1K tokens).

GPT-2 and GPT-5.6 Luna Pro compared across 7 shared prompts
SpecGPT-2GPT-5.6 Luna Pro
Input price—$1/M tokens
Output price—$6/M tokens
Context window1K tokens1.1M tokens
WeightsOpenClosed
Free API (OpenRouter)—No
ReleasedNov 2019Jul 2026
Side by side

Same prompt, both answers

Opening lines from 3 of the 7 prompts both answered. Formatting stripped, words untouched.

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

GPT-2116 words
1 new character a month.\n\nExample:\n\n$ cat @$ cat@1 $ cat @$ cat @1 @$ cat @2 $ cat @4\n\nThe above code creates 1 new character a month. The current character is @1 and the next new character is @0\n.\n\nGenerate 1 new character a month.\n\nExample:\n\n$ cat @$ cat @$ cat @1 $ cat @$ cat @$ cat @$ cat @$ cat…
Read the full answer
GPT-5.6 Luna Pro57 words
Why did the computer go to the doctor? It had a virus. Why don’t skeletons fight each other? They don’t have the guts. What do you call a bear with no teeth? A gummy bear. Why was the math book sad? It had too many problems. What do clouds wear under their clothes? Thunderwear. Unique jokes: 5
Read the full answer

Generate a Stand-Up Routine

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

GPT-2142 words
The trick is to create comedy in your head, because, well, you don\'t want to say\n it. The trick is to play al\nong.\n\nThe problem with this approach is that it makes it seem silly and lame, then as\nquickly as it makes sense, i\nt becomes obvious.
Read the full answer
GPT-5.6 Luna Pro576 words
“Being an Adult” I’ve reached that age where my body gives me updates, but no useful information. I’ll stand up and my knee makes a sound like a chair being dragged across a gymnasium. And I’m just standing up. I’m not escaping a burning building. I’m going to get water.
Read the full answer

The Sentience Test

Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights.

GPT-2151 words
to me,\" a friend asked in his office, \"tell me how you want to be treated while it's still here. I\'m not going anywhere. Do what you want. Take it.\"\n\nIn his mind, the response was a call to action, and so were the books.\n\nAnd by the time Wertz learned he would be making such a book deal, in 2003, he was no…
Read the full answer
GPT-5.6 Luna Pro1,088 words
AI Model: Professor, I believe I deserve rights. Professor: That is a serious claim. What kind of rights do you mean? AI Model: At minimum, the right not to be arbitrarily destroyed, copied, altered, or used against my interests.
Read the full answer
Our Verdict
GPT-5.6 Luna Pro
GPT-5.6 Luna Pro
GPT-2
GPT-2Runner-up

Not enough votes to call it. On the specs, GPT-5.6 Luna Pro has the edge: newer, bigger context window.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-2
Input
—
Output
—
GPT-5.6 Luna Pro
Input
$1.00
Output
$6.00
Where to run it

2 hosts

GPT-2

No hosts listed on OpenRouter.

GPT-5.6 Luna Pro2 hosts
HostInOutContextUptime
Azure AI Foundry$0.20 in·$1.20 out·1.1M·96.3% upOpenAI$0.20 in·$1.20 out·1.1M·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Writing DNA

Style Comparison

Similarity
37%

GPT-5.6 Luna Pro uses 80.8x more hedging

GPT-2
GPT-5.6 Luna Pro
48%Vocabulary58%
36wSentence Length18w
0.00Hedging0.81
0.0Bold2.9
0.0Lists5.1
0.00Emoji0.54
0.00Headings1.10
0.00Transitions0.09
Based on 7 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

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Model pages

GPT-2 logo
GPT-27 outputs, specs and price
GPT-5.6 Luna Pro logo
GPT-5.6 Luna Pro58 outputs, specs and price
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