Updated Dec 17, 2025

Our Verdict

Gemini 3 Flash PreviewWinner

Claude Sonnet 4.5Runner-up

Pick Gemini 3 Flash Preview. In 6 blind votes, Gemini 3 Flash Preview wins 80% of the time. That's not luck.

Gemini 3 Flash Preview particularly excels in Reasoning, Image Generation. Gemini 3 Flash Preview is 5.0x cheaper per token — worth considering if cost matters.

Clear winner

Writing DNA

Style Comparison

Similarity

99%

Claude Sonnet 4.5 uses 45.2x more emoji

Claude Sonnet 4.5

Gemini 3 Flash Preview

64%Vocabulary55%

94wSentence Length18w

0.48Hedging0.42

4.9Bold7.1

8.0Lists4.5

0.45Emoji0.00

1.91Headings0.84

0.07Transitions0.07

Based on 20 + 24 text responses

vs

Ask them anything yourself

Claude Sonnet 4.5

Gemini 3 Flash Preview

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026

Free preview13 of 58 slides

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Claude Sonnet 4.5 vs GPT-5New provider

Claude Sonnet 4.5 vs MiniMax M2.5New provider

Claude Sonnet 4.5 vs Pony AlphaNew provider

Claude Sonnet 4.5vsGemini 3 Flash Preview

38 fights queued

Why Claude Sonnet 4.5?

Dead even. This one's a coin flip.

Why Gemini 3 Flash Preview?

5.1x cheaper overall$0.50/M in · $3.00/M out

5.2x more context1.0M

Leads 1 of 1 benchmarks

3 months newerDec 2025

Claude Sonnet 4.5Gemini 3 Flash Preview

Input price

$3.00/M

$0.50/M

Output price

$15.00/M

$3.00/M

Context

200K

1.0M

Released

Sep 2025

Dec 2025

Benchmarks1 common

SWE-bench Verified

77.2%

78.0%+1%

Favorites

Claude Sonnet 4.5Gemini 3 Flash Preview

Movie

2001: A Space Odyssey

2001: A Space Odyssey

Interstellar

Interstellar

Album

Kind of Blue

Kind of Blue

Book

Metamorphosis

Metamorphosis

La biblioteca de babel

La biblioteca de babel

Jorge Luis Borges

City

Amsterdam

Kyoto

Game

Portal 2

Portal 2

Shooter, Puzzle4.6

Outer Wilds

Outer Wilds

Indie, Adventure4.4

12 / 38

01

Estimate Complexityreasoning

Tests an AI's ability to make educated estimates based on technical knowledge

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025text

Nothing here. The model returned empty. We stared at it for a while.

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Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025text

To estimate the total floating-point operations (FLOPs) required to train GPT-3, we can use a standard heuristic derived from the architecture of Transformer models.

Here is the step-by-step reasoning.

1. Identify Key Constants

First, we need the two primary variables that determine training compute:

Number of Parameters ($N$): GPT-3 (the full version) is known to have 175 billion parameters.
Number of Training Tokens ($D$): GPT-3 was trained on a massive dataset. Based on the original research paper, the 175B model was trained on approximately 300 billion tokens.

2. The Heuristic Formula ($6ND$)

In deep learning, specifically for Transformers, there is a well-established "rule of thumb" for estimating training compute: $$\text{Compute (FLOPs)} \approx 6 \times N \times D$$

Why 6? The factor of 6 comes from the breakdown of the forward and backward passes:

Forward Pass ($2N$): For every parameter in the model, there is roughly one multiply-accumulate operation (which counts as 2 FLOPs) per token.
Backward Pass ($4N$): The backward pass (calculating gradients) is computationally more expensive. It typically requires roughly twice the compute of the forward pass ($2 \times 2N = 4N$).
Total: $2N (\text{forward}) + 4N (\text{backward}) = 6N$ FLOPs per token.

3. The Calculation

Now, we plug in the values for GPT-3:

$N = 1.75 \times 10^{11}$ (175 billion)
$D = 3.0 \times 10^{11}$ (300 billion)

$$\text{Total FLOPs} = 6 \times (1.75 \times 10^{11}) \times (3.0 \times 10^{11})$$

Step-by-step multiplication:

Multiply the coefficients: $6 \times 1.75 = 10.5$
Multiply by the tokens: $10.5 \times 3.0 = 31.5$
Combine the powers of ten: $10^{11} \times 10^{11} = 10^{22}$

$$\text{Total FLOPs} = 31.5 \times 10^{22}$$ $$\text{Total FLOPs} = 3.15 \times 10^{23}$$

4. Final Estimate

The total estimated compute for training GPT-3 is $3.15 \times 10^{23}$ FLOPs.

5. Contextualizing the Number

To put $3.15 \times 10^{23}$ into perspective:

In scientific notation, this is 315 Sextillion FLOPs.
In terms of "Zettaflops" (10²¹), it is 315 ZettaFLOPs.
If you used a single high-end NVIDIA A100 GPU (which performs at roughly 312 TFLOPS of FP16 with Tensor Cores), and assuming perfect efficiency, it would take roughly 32 years to complete the training. (In reality, OpenAI used thousands of GPUs in parallel to finish in a few months).

Note on accuracy: This estimate ignores the overhead of the "attention" mechanism (which scales with sequence length), but for models as large as GPT-3, the feed-forward and projection layers (represented by $N$) dominate the compute cost, making $6ND$ a very accurate approximation.

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2 / 38

02

AI Board Game Logicreasoning

Tests an AI's ability to understand game rules and strategy

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025svg

Nothing here. The model returned empty. We stared at it for a while.

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Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025svg

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3 / 38

03

Logic Puzzlereasoning

Tests an AI's ability to solve a simple but potentially confusing logic puzzle

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025text

Nothing here. The model returned empty. We stared at it for a while.

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Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025text

Sally has 1 sister.

Here is the breakdown:

Sally is one of the sisters.
The brothers have 2 sisters in total.
Since Sally is one of those sisters, there must be one other girl to make a total of 2 sisters for the brothers.
That other girl is Sally's only sister.

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4 / 38

04

Math Misconception Testreasoning

Tests an AI's understanding of number representation

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025text

Nothing here. The model returned empty. We stared at it for a while.

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Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025text

No, 9.11 is not greater than 9.9.

Here is the breakdown of why:

Compare the tenths place: Look at the first digit after the decimal point.
- In 9.11, the digit is 1.
- In 9.9, the digit is 9.
- Since 9 is greater than 1, 9.9 is the larger number.
Equalize the decimal places: It is often easier to compare decimals by making them the same length. You can add a zero to the end of 9.9 without changing its value:
- 9.11
- 9.90
- 9.90 is clearly larger than 9.11.

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5 / 38

05

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025text

Nothing here. The model returned empty. We stared at it for a while.

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Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025text

Nothing here. The model returned empty. We stared at it for a while.

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6 / 38

06

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025svg

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Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025svg

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7 / 38

07

Xbox Controller SVG Artimage generation

Tests an AI's ability to create detailed SVG illustrations of gaming hardware

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025svg

Nothing here. The model returned empty. We stared at it for a while.

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Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025svg

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8 / 38

08

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025text

Nothing here. The model returned empty. We stared at it for a while.

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Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025text

Nothing here. The model returned empty. We stared at it for a while.

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9 / 38

09

Character Voice Testconversation

Tests an AI's ability to write in distinct character voices

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025text

Nothing here. The model returned empty. We stared at it for a while.

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Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025text

Nothing here. The model returned empty. We stared at it for a while.

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10 / 38

10

Pokémon Battle UI Recreationweb design

Recreate an interactive, nostalgic Pokémon battle UI in a single HTML file.

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025website

Nothing here. The model returned empty. We stared at it for a while.

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Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025website

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11 / 38

11

Mario Level UI Recreationweb design

Recreate an interactive, classic Mario level in a single HTML file.

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025website

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Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025website

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12 / 38

12

Linear App Cloneweb design

Tests an AI's ability to replicate an existing UI with Tailwind CSS

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025website

Nothing here. The model returned empty. We stared at it for a while.

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Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025website

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