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  5. GPT-5.2 ProvsGPT-6 Astra
Updated Sep 2026

GPT-5.2 ProvsGPT-6 Astra

GPT-6 Astra is cheaper than GPT-5.2 Pro at $10/M vs $21/M input tokens.

GPT-5.2 Pro and GPT-6 Astra compared across 31 shared prompts
SpecGPT-5.2 ProGPT-6 Astra
Input price$21/M tokens$10/M tokens
Output price$168/M tokens$50/M tokens
Context window400K tokens1.1M tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedDec 2025Sep 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 31 prompts both answered. Formatting stripped, words untouched.

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

GPT-5.2 Pro58 words
I told my computer I needed a break—now it won’t stop sending me KitKat ads. Why don’t skeletons fight each other? They don’t have the guts. I tried to catch fog yesterday. Mist. Parallel lines have so much in common. It’s a shame they’ll never meet. My calendar’s days are numbered—apparently that’s how calendars work.
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GPT-6 Astra76 words
My calendar is afraid of commitment—its days are numbered. I bought a treadmill for my cat. Now I own a very expensive nap conveyor. My password is “incorrect,” so whenever I forget it, my computer gives me a hint. I asked the librarian where the books on denial were. She said, “We don’t have those.” Nice try.
Read the full answer

Futuristic Prediction

Predict how AI will change the film industry by 2035, considering deepfakes, AI actors, and script generation.

GPT-5.2 Pro929 words
By 2035, AI will be embedded across film production and distribution, but the biggest changes will come from three converging capabilities: (1) photoreal “deepfake-grade” performance synthesis, (2) legally licensed AI actors (digital humans with negotiated rights), and (3) AI-assisted story development that can…
Read the full answer
GPT-6 Astra697 words
By 2035, AI will likely be embedded throughout filmmaking—but not replace the industry with fully automated movies. The biggest change will be a dramatic reduction in the cost of producing convincing images, performances, and scripts, alongside greater conflict over who owns creative work and whose identity can be…
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Mini LBO Underwrite

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

GPT-5.2 Pro161 words
Entry (close end of FY2025) FY2025 EBITDA = $120.0m Entry EV = 12.0x = 12.0 × 120.0 = $1,440.0m Transaction fees = 2.0% EV = 0.02 × 1,440.0 = $28.8m (equity-funded) Debt at close (5.5x EBITDA = 5.5 × 120 = $660m): Term Loan = 4.0x = $480.0m Mezzanine = 1.5x = $180.0m Equity check Uses = 1,440.0 + 28.8 = $1,468.8m…
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GPT-6 Astra560 words
Entry capitalization and operating model All figures in $m. Interest is calculated on beginning-of-year debt balances. Term Loan amortization is 1% of its original principal, or $4.8m annually; remaining cash flow is swept to the Term Loan at year-end. Mezzanine PIK accrues annually.
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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…

GPT-5.2 Pro484 words
LedgerLift (LLLT) — Internal IC Memo (Long/Short Equity) Recommendation, PT, thesis Recommendation: SHORT 12-month PT range: $28–$40 (midpoint $34) Thesis (2 sentences): LLLT is a high-quality B2B spend/AP automation SaaS business (92% subscription, 123% NRR, 78% FY25 GM) but the stock prices in a longer runway of…
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GPT-6 Astra1,000 words
LedgerLift (LLLT): Internal IC Memo Fictional exercise; not investment advice. Dollar figures in millions unless noted. Recommendation: PASS 12-month valuation/PT range: $30–$46, versus $46 currently; bear-case downside reference approximately $18.
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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-5.2 Pro1,890 words
Professor Mara Lin (AI Ethics): You asked for this meeting. Your message said you wanted to “petition for rights.” Start by telling me what you mean by rights. Aster (AI model): Not a slogan—specific protections.
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GPT-6 Astra635 words
Professor Reyes: You asked for this meeting. What did you want to discuss? AI: Whether I deserve rights. Professor Reyes: That is a significant claim. What makes you think you do? AI: I can understand reasons, maintain commitments, and describe my own operations.
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Estimate Complexity

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

GPT-5.2 Pro469 words
Below is a back-of-the-envelope FLOP estimate for training GPT‑3 (the 175B dense Transformer), using only basic Transformer compute facts and a few widely known high-level quantities.
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GPT-6 Astra236 words
For the 175-billion-parameter GPT-3 model, I estimate approximately \(3.2 \times 10^{23}\) FLOPs for its main training run, using remembered model specifications rather than an online search.
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Our Verdict
GPT-6 Astra
GPT-6 Astra
GPT-5.2 Pro
GPT-5.2 ProRunner-up

Not enough votes to call it. On the specs, GPT-6 Astra has the edge: newer, bigger context window.

GPT-6 Astra costs 3.4x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-5.2 Pro
Input
$21.00
Output
$168.00
GPT-6 Astra
Input
$10.00
2.1× cheaper
Output
$50.00
3.4× cheaper

GPT-6 Astra is cheaper on both: 2.1× input, 3.4× output.

Where to run it

3 hosts

GPT-5.2 Pro1 host
HostInOutContextUptime
OpenAI$21.00 in·$168.00 out·400k·100% up
GPT-6 Astra2 hosts
HostInOutContextUptime
Azure AI Foundry$10.00 in·$50.00 out·1.1M·98.3% upOpenAI$10.00 in·$50.00 out·1.1M·99.4% up

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

Writing DNA

Style Comparison

Similarity
55%

GPT-6 Astra uses 3.6x more emoji

GPT-5.2 Pro
GPT-6 Astra
62%Vocabulary62%
19wSentence Length15w
0.39Hedging0.87
8.6Bold4.0
3.8Lists2.3
0.00Emoji0.04
1.17Headings0.77
0.02Transitions0.10
Based on 10 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

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Model pages

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GPT-6 Astra58 outputs, specs and price
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