Which is better, Gemini 3.8 Flash or GPT-5.4 Pro?

Gemini 3.8 Flash scores higher on 2 of 6 shared quality measures, GPT-5.4 Pro on 1. 3 measures are too close to call. Gemini 3.8 Flash costs about 98% less than GPT-5.4 Pro on a blended price of $1.50 against $67.50 per million tokens. Which one is better for you depends on your task and budget, so test both on your own work.

Which is cheaper, Gemini 3.8 Flash or GPT-5.4 Pro?

Gemini 3.8 Flash is cheaper on blended price: $1.50 per million tokens for Gemini 3.8 Flash against $67.50 for GPT-5.4 Pro. For 100 chats of about 1,000 tokens in and 500 tokens back, that is about $0.26 for Gemini 3.8 Flash and $12 for GPT-5.4 Pro.

Which can read longer documents, Gemini 3.8 Flash or GPT-5.4 Pro?

Gemini 3.8 Flash has a context window of 1M tokens and GPT-5.4 Pro has 1.1M tokens.

AI Rankings

Gemini 3.8 Flash vs GPT-5.4 Pro: Scores, Price and Which to Choose

Side by side on every measure both models share: overall score, human votes, tests, price and context window. Close results are called too close to call.

Data updated 26 Oct 2026

Read the model pages for the full picture: Gemini 3.8 Flash and GPT-5.4 Pro.

Side by side

A check mark shows the better side on each measure. Scores that are too close to call have no winner.

Gemini 3.8 Flash compared with GPT-5.4 ProGemini 3.8 Flash against GPT-5.4 Pro on 8 measures. Gemini 3.8 Flash is better on 3, GPT-5.4 Pro on 1, 4 are too close to call, 0 have no data for one side.

Gemini 3.8 Flash
GPT-5.4 Pro

Epoch Capabilities IndexToo close to call
Combined score over many tests. Bar shows where it sits between the lowest and highest score we track.
Gemini 3.8 Flash:
157.4
GPT-5.4 Pro:
159.6
Humanity's Last ExamToo close to call
A large set of very hard, expert-written questions across many subjects, built to stay difficult for top AI models.
Gemini 3.8 Flash:
44.5%
GPT-5.4 Pro:
44.3%
ARC-AGI-2Gemini 3.8 Flash leads
Visual puzzles where the AI must work out a new rule from a few examples and apply it.
Gemini 3.8 Flash:
Better: 89.2%
GPT-5.4 Pro:
83.3%
FrontierMath (Tiers 1-3)GPT-5.4 Pro leads
Original, very hard maths problems written by mathematicians.
Gemini 3.8 Flash:
68.4%
GPT-5.4 Pro:
Better: 82.5%
GPQA DiamondToo close to call
Very hard multiple-choice science questions in biology, physics and chemistry, written by experts and designed so a quick web search does not give the answer.
Gemini 3.8 Flash:
95.4%
GPT-5.4 Pro:
94.6%
SimpleQA VerifiedGemini 3.8 Flash leads
Short factual questions that each have one correct answer.
Gemini 3.8 Flash:
Better: 69.7%
GPT-5.4 Pro:
46.3%
Blended price per million tokensGemini 3.8 Flash costs less
Blended price: lower is better.
Gemini 3.8 Flash:
Better: $1.50
GPT-5.4 Pro:
$67.50
Context windowToo close to call
How much text it can read at once.
Gemini 3.8 Flash:
1M tokens
GPT-5.4 Pro:
1.1M tokens

Data updated 26 Oct 2026. Only measures that both models have are shown.

The numbers

Gemini 3.8 Flash against GPT-5.4 Pro, measure by measure. A check mark shows the better side.
Measure	Gemini 3.8 Flash	GPT-5.4 Pro
Epoch Capabilities IndexToo close to call	157.4	159.6
Humanity's Last ExamToo close to call	44.5%	44.3%
ARC-AGI-2	89.2%	83.3%
FrontierMath (Tiers 1-3)	68.4%	82.5%
GPQA DiamondToo close to call	95.4%	94.6%
SimpleQA Verified	69.7%	46.3%
Blended price per million tokens	$1.50	$67.50
Context windowToo close to call	1M tokens	1.1M tokens

What it costs in everyday terms

Estimate for 100 chats of about 1,000 tokens in and 500 tokens back, from list prices. Your bill depends on how you use it.

100 chats with Gemini 3.8 Flash: $0.26; Blended price $1.50 per million tokens.
100 chats with GPT-5.4 Pro: $12; Blended price $67.50 per million tokens.

Who should pick which

Pick Gemini 3.8 Flash if these matter most

ARC-AGI-2: 89.2% against 83.3%
SimpleQA Verified: 69.7% against 46.3%
Blended price per million tokens: $1.50 against $67.50

Pick GPT-5.4 Pro if these matter most

FrontierMath (Tiers 1-3): 82.5% against 68.4%

Too close to call: Epoch Capabilities Index, Humanity's Last Exam, GPQA Diamond, Context window.

Scores come from tests and votes, not from your own work. Try both on a task you care about before you commit.

Go deeper

Gemini 3.8 Flash: full page

GPT-5.4 Pro: full page

Questions about this comparison

Which is better, Gemini 3.8 Flash or GPT-5.4 Pro?: Gemini 3.8 Flash scores higher on 2 of 6 shared quality measures, GPT-5.4 Pro on 1. 3 measures are too close to call. Gemini 3.8 Flash costs about 98% less than GPT-5.4 Pro on a blended price of $1.50 against $67.50 per million tokens. Which one is better for you depends on your task and budget, so test both on your own work.
Which is cheaper, Gemini 3.8 Flash or GPT-5.4 Pro?: Gemini 3.8 Flash is cheaper on blended price: $1.50 per million tokens for Gemini 3.8 Flash against $67.50 for GPT-5.4 Pro. For 100 chats of about 1,000 tokens in and 500 tokens back, that is about $0.26 for Gemini 3.8 Flash and $12 for GPT-5.4 Pro.
Which can read longer documents, Gemini 3.8 Flash or GPT-5.4 Pro?: Gemini 3.8 Flash has a context window of 1M tokens and GPT-5.4 Pro has 1.1M tokens.

Where this data comes from

Epoch AI: Benchmark data: Epoch AI, 'Capabilities & benchmarking', epoch.ai/benchmarks (CC BY 4.0). We match models across sources, rank them and show them in charts. Scores are not changed. Epoch AI does not endorse this site.
Arena (formerly LMArena): Human-preference ratings: Arena (arena.ai) leaderboard dataset, CC BY 4.0. We keep the latest published ratings, match them to models from other sources and rank them. Ratings are not changed. Arena does not endorse this site.
LiteLLM model price list: Prices and context windows: LiteLLM model price list (github.com/BerriAI/litellm, MIT licence). We use the model maker's own price entry when there is one. Prices change often, so always confirm on the maker's site before you buy.

Newest data on this page: 26 Oct 2026. Prices are list prices and change often, so confirm on the maker's site before you buy. Sponsors never change a score or an order. How we calculate this · Report a mistake