Gemini 3.1 Flash Lite Preview vs GPT-5

GPT-5 leads Gemini 3.1 Flash Lite Preview on coding, 38.8 to 22.7 on the Vibe Coding Index, and Gemini 3.1 Flash Lite Preview costs 6.7x less per output token ($1.50 vs $10.00 per million). Updated October 22, 2026; 68 benchmarks have a result for both.

Replace Gemini 3.1 Flash Lite Preview Replace GPT-5

Gemini 3.1 Flash Lite PreviewGoogle

Coding: 22.7
Overall: 36.6
Output $/M: $1.50

GPT-5OpenAI

Coding: 38.8
Overall: 51.5
Output $/M: $10.00

vs boards won of 68 shared

Gemini 3.1 Flash Lite Preview or GPT-5: which to pick

Pick GPT-5 for coding: it scores 38.8 on the Vibe Coding Index against 22.7 for Gemini 3.1 Flash Lite Preview.

Pick Gemini 3.1 Flash Lite Preview for output tokens 6.7x cheaper ($1.50 vs $10.00 per million) and a lower cost per solved task ($0.18 against $0.39).

Model AGemini 3.1 Flash Lite PreviewGoogle22.7/1003 independent benchmarks$0.18 per solved task Model BGPT-5OpenAI38.8/1003 independent benchmarks$0.39 per solved task

681145

Shared results: 68
Gemini 3.1 Flash Lite Preview only: 11
GPT-5 only: 45
Like-for-like categories: 7 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

Coding
Vibe Coding Index, six public coding benchmarks
GPT-5
GPT-5 scores 38.8 against 22.7.
3 benchmarks behind each score
Intelligence
AA Intelligence Index
GPT-5
GPT-5 leads, 23.0 against 15.6.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Gemini 3.1 Flash Lite Preview has a AA Agentic Index result, 1.6.
Directional only
Reasoning
GPQA Diamond
GPT-5
GPT-5 leads, 85.6% against 81.1%.
Same board, both measured
Math
AIME
GPT-5
GPT-5 leads, 93.4% against 83.3%.
Same board, both measured
Knowledge
MMLU Pro
GPT-5
GPT-5 leads, 86.5% against 86.2%.
Same board, both measured
Web design
Design Arena: websites
GPT-5
GPT-5 leads, 1184 against 1082.
Same board, both measured
Long documents
Listed context window
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview takes 1.05M tokens against 400K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview $0.0010, GPT-5 $0.0063 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview $0.18, GPT-5 $0.39.
Published attempt cost and pass rate

At a glance

Coding index: Gemini 3.1 Flash Lite Preview 22.7 from 3 benchmarks, GPT-5 38.8 from 3 benchmarks.
Widest category: Web design, 12.6 points apart on average over 8 shared benchmarks.
Widest single gap: LMArena WebDev: HTML: Gemini 3.1 Flash Lite Preview 1276 against GPT-5 1427, 25.1 points apart on a 0 to 100 scale.
Output price: Gemini 3.1 Flash Lite Preview $1.50 against GPT-5 $10.00 per million output tokens, 6.7x apart.
Context window: Gemini 3.1 Flash Lite Preview takes 1.05M tokens, GPT-5 400K.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
Category	Gemini 3.1 Flash Lite Preview	GPT-5
Coding	1	9
Intelligence	0	1
Reasoning	1	6
Math	2	1
Knowledge	3	9
Web design	1	7
General	23	4
All shared boards	31	37

CodingLike-for-likeSix of these boards feed the Vibe Coding Index19

Coding benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5	Leader
Aider polyglot	Not measured	88.0%	Only GPT-5 measured
SWE-bench Verified	Not measured	74.4%	Only GPT-5 measured
LMArena WebDev	1257	1418	GPT-5
AA Coding Index	34.7	37.8	GPT-5
LiveCodeBench (Vals AI)	80.1%	85.9%	GPT-5
SWE-bench Verified (Vals AI)	62.8%	69.0%	GPT-5
Vibe Code Bench (Vals AI)	0.0%	20.1%	GPT-5
Code migration (Vals AI)	4.6%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
ProgramBench (Vals AI)	0.0%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Terminal-Bench 2.1 (Vals AI)	34.1%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LiveCodeBench (Artificial Analysis run)	Not measured	84.6%	Only GPT-5 measured
Terminal-Bench Hard (Artificial Analysis run)	Not measured	37.9%	Only GPT-5 measured
Terminal-Bench	Not measured	49.6%	Only GPT-5 measured
GSO-Bench	Not measured	6.9%	Only GPT-5 measured
WeirdML	Not measured	60.7%	Only GPT-5 measured
ALE-Bench	797.7	807.6	GPT-5
LMArena Text: coding	1400	1436	GPT-5
LMArena Text: software and IT	1413	1420	GPT-5
LMArena WebDev: React	1245	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena WebDev: HTML	1276	1427	GPT-5
LMArena WebDev: from an image	1336	Not measured	Only Gemini 3.1 Flash Lite Preview measured
SciCode	4.6%	0.0%	Gemini 3.1 Flash Lite Preview
Neither model has a result on the other 17 boards here

IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01

Intelligence benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5	Leader
AA Intelligence Index	15.6	23.0	GPT-5
Epoch Capabilities Index	Not measured	150.0	Only GPT-5 measured

Agentic workDirectional onlyPublic boards, shown as published, kept out of the index12 boards, none shared

Agentic work benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5	Leader
AA Agentic Index	1.6	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Finance Agent (Vals AI)	30.0%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Tax Agent Bench (Vals AI)	3.1%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Legal Research Bench (Vals AI)	3.4%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Excel Modeling Benchmark (Vals AI)	8.6%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
τ²-Bench Telecom	Not measured	86.5%	Only GPT-5 measured
METR time horizons	Not measured	69.6%	Only GPT-5 measured
Remote Labor Index	Not measured	1.7%	Only GPT-5 measured
GDPval	Not measured	34.8%	Only GPT-5 measured
BALROG	Not measured	32.8%	Only GPT-5 measured
DeepResearch Bench	Not measured	49.6%	Only GPT-5 measured
BrowseComp-Plus	Not measured	80.0%	Only GPT-5 measured
Neither model has a result on the other 29 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index16

Reasoning benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5	Leader
GPQA Diamond	81.1%	85.6%	GPT-5
MMMU Pro (Vals AI)	82.5%	81.5%	Gemini 3.1 Flash Lite Preview
GPQA Diamond (Artificial Analysis run)	Not measured	85.4%	Only GPT-5 measured
Humanity's Last Exam (Artificial Analysis run)	Not measured	28.5%	Only GPT-5 measured
GPQA Diamond (Epoch AI run)	Not measured	86.2%	Only GPT-5 measured
ARC-AGI	Not measured	65.7%	Only GPT-5 measured
ARC-AGI-2	Not measured	9.9%	Only GPT-5 measured
SimpleBench	Not measured	56.7%	Only GPT-5 measured
Chess puzzles	Not measured	36.0%	Only GPT-5 measured
Mystery game puzzles	Not measured	23.0%	Only GPT-5 measured
EBR-bench	Not measured	12.7%	Only GPT-5 measured
VPCT	Not measured	66.0%	Only GPT-5 measured
LMArena Text: hard prompts	1407	1415	GPT-5
LMArena Text: expert	1398	1419	GPT-5
LMArena Text: hard prompts in English	1403	1419	GPT-5
LMArena Vision: diagrams	1242	1252	GPT-5
LMArena Vision: homework	1271	1278	GPT-5
Kagi LLM Benchmark	Not measured	72.7%	Only GPT-5 measured
Neither model has a result on the other 4 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index21

Math benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5	Leader
AIME	83.3%	93.4%	GPT-5
MATH 500 (Vals AI)	Not measured	96.0%	Only GPT-5 measured
MGSM (Vals AI)	Not measured	92.8%	Only GPT-5 measured
AA Math Index	Not measured	94.3	Only GPT-5 measured
AIME 2025 (Artificial Analysis run)	Not measured	94.3%	Only GPT-5 measured
OTIS Mock AIME	Not measured	91.4%	Only GPT-5 measured
FrontierMath, tiers 1 to 3	Not measured	55.4%	Only GPT-5 measured
FrontierMath, tier 4	Not measured	22.0%	Only GPT-5 measured
ProofBench	Not measured	18.0%	Only GPT-5 measured
MATH level 5	Not measured	98.1%	Only GPT-5 measured
LMArena Text: math	1428	1407	Gemini 3.1 Flash Lite Preview
LMArena Text: mathematical work	1417	1405	Gemini 3.1 Flash Lite Preview
Neither model has a result on the other 1 board here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index39

Knowledge benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5	Leader
MMLU Pro	86.2%	86.5%	GPT-5
LegalBench (Vals AI)	83.8%	86.0%	GPT-5
CaseLaw (Vals AI)	55.0%	66.5%	GPT-5
CorpFin (Vals AI)	59.4%	61.1%	GPT-5
TaxEval (Vals AI)	71.8%	73.4%	GPT-5
MortgageTax (Vals AI)	68.0%	65.5%	Gemini 3.1 Flash Lite Preview
MedQA (Vals AI)	Not measured	96.3%	Only GPT-5 measured
MedCode (Vals AI)	47.6%	49.6%	GPT-5
MMLU Pro (Artificial Analysis run)	Not measured	87.1%	Only GPT-5 measured
SimpleQA Verified	Not measured	50.1%	Only GPT-5 measured
GeoBench	Not measured	81.0%	Only GPT-5 measured
LMArena Text: science	1425	1416	Gemini 3.1 Flash Lite Preview
LMArena Text: medicine and healthcare	1428	1413	Gemini 3.1 Flash Lite Preview
LMArena Text: legal and government	1418	1431	GPT-5
LMArena Text: business and finance	1389	1400	GPT-5
FACTS Benchmark Suite	51.4%	56.5%	GPT-5
Neither model has a result on the other 2 boards here

Web designLike-for-likePublic boards, shown as published, kept out of the index17

Web design benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5	Leader
Design Arena: websites	1082	1184	GPT-5
Design Arena: UI components	1069	1177	GPT-5
Design Arena: game dev	1029	1185	GPT-5
Design Arena: data viz	1045	1221	GPT-5
Design Arena: 3D	1047	1055	GPT-5
Design Arena: all code categories	1072	1167	GPT-5
Design Arena: SVG	1052	1188	GPT-5
Design Arena: ASCII art	1167	1141	Gemini 3.1 Flash Lite Preview
Neither model has a result on the other 1 board here

GeneralLike-for-likePublic boards, shown as published, kept out of the index234

General benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5	Leader
SAGE (Vals AI)	49.5%	43.7%	Gemini 3.1 Flash Lite Preview
MedScribe (Vals AI)	63.9%	83.7%	GPT-5
Vals Multimodal Index	41.4%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
IFBench	Not measured	73.1%	Only GPT-5 measured
Long context reasoning (AA-LCR)	Not measured	78.2%	Only GPT-5 measured
DTBench	Not measured	90.7%	Only GPT-5 measured
LMCA	Not measured	40.0%	Only GPT-5 measured
Fiction.LiveBench	Not measured	97.2%	Only GPT-5 measured
Creative writing (Lech Mazur)	Not measured	86.0%	Only GPT-5 measured
LMArena Text	1416	1406	Gemini 3.1 Flash Lite Preview
LMArena Text: instruction following	1377	1388	GPT-5
LMArena Text: creative writing	1401	1365	Gemini 3.1 Flash Lite Preview
LMArena Vision	1240	1232	Gemini 3.1 Flash Lite Preview
LMArena Text: English	1414	1409	Gemini 3.1 Flash Lite Preview
LMArena Text: non-English	1410	1397	Gemini 3.1 Flash Lite Preview
LMArena Text: Chinese	1460	1422	Gemini 3.1 Flash Lite Preview
LMArena Text: German	1430	1416	Gemini 3.1 Flash Lite Preview
LMArena Text: Japanese	1413	1409	Gemini 3.1 Flash Lite Preview
LMArena Text: Korean	1392	1360	Gemini 3.1 Flash Lite Preview
LMArena Text: French	1424	1409	Gemini 3.1 Flash Lite Preview
LMArena Text: Spanish	1421	1399	Gemini 3.1 Flash Lite Preview
LMArena Text: Russian	1420	1407	Gemini 3.1 Flash Lite Preview
LMArena Text: Polish	1443	1431	Gemini 3.1 Flash Lite Preview
LMArena Text: multi-turn	1417	1426	GPT-5
LMArena Text: longer queries	1394	1399	GPT-5
LMArena Text: writing and language	1408	1384	Gemini 3.1 Flash Lite Preview
LMArena Text: entertainment and media	1386	1379	Gemini 3.1 Flash Lite Preview
LMArena Vision: English	1232	1231	Gemini 3.1 Flash Lite Preview
LMArena Vision: Chinese	1278	1267	Gemini 3.1 Flash Lite Preview
LMArena Vision: reading text	1246	1246	Gemini 3.1 Flash Lite Preview
LMArena Vision: humor	1266	1219	Gemini 3.1 Flash Lite Preview
LMArena Vision: captioning	1259	1212	Gemini 3.1 Flash Lite Preview
LMArena Vision: recognizing things	1308	1263	Gemini 3.1 Flash Lite Preview
LMArena Vision: creative writing	1248	1210	Gemini 3.1 Flash Lite Preview
Neither model has a result on the other 12 boards here

Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared

Image generation benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5	Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Gemini 3.1 Flash Lite Preview$0.0010Fits in one request

GPT-5$0.0063Fits in one request

Gemini 3.1 Flash Lite Preview costs less

Repository review

50K input + 3K output tokens

Gemini 3.1 Flash Lite Preview$0.017Fits in one request

GPT-5$0.092Fits in one request

Gemini 3.1 Flash Lite Preview costs less

Agent loop

200K input + 10K output tokens

Gemini 3.1 Flash Lite Preview$0.065Fits in one request

GPT-5$0.350Fits in one request

Gemini 3.1 Flash Lite Preview costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Gemini 3.1 Flash Lite Preview and GPT-5
Specification	Google Gemini 3.1 Flash Lite Preview	OpenAI GPT-5
Maker	Google	OpenAI
Weights	No public weights listed	No public weights listed
Released	March 3, 2026	August 7, 2025
Context window	1.05M	400K
Input $/Mtok	$0.25	$1.25
Output $/Mtok	$1.50	$10.00
Coding index	22.7	38.8
Independent measurements behind it	3	3
Cost per solved task	$0.18	$0.39
Source	OpenRouter listing	OpenRouter listing

Questions

Is Gemini 3.1 Flash Lite Preview better than GPT-5 for coding?

Pick GPT-5 for coding: it scores 38.8 on the Vibe Coding Index against 22.7 for Gemini 3.1 Flash Lite Preview. Pick Gemini 3.1 Flash Lite Preview for output tokens 6.7x cheaper ($1.50 vs $10.00 per million) and a lower cost per solved task ($0.18 against $0.39).

Which is cheaper, Gemini 3.1 Flash Lite Preview or GPT-5?

Gemini 3.1 Flash Lite Preview costs $0.25 per million input tokens and $1.50 per million output tokens; GPT-5 costs $1.25 and $10.00. Per solved SWE-bench Verified task, Gemini 3.1 Flash Lite Preview costs $0.18 and GPT-5 $0.39.

Which has the bigger context window, Gemini 3.1 Flash Lite Preview or GPT-5?

Gemini 3.1 Flash Lite Preview, with 1.05M tokens against 400K.

How many benchmarks is the Gemini 3.1 Flash Lite Preview vs GPT-5 comparison based on?

68 benchmarks have a result for both models as of October 22, 2026. Gemini 3.1 Flash Lite Preview's coding index rests on 3 independent benchmarks and GPT-5's on 3. Where only one model has a result, the page says so instead of naming a winner.

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<iframe src="https://llmbenchmark.ai/embed/compare/gemini-3-1-flash-lite-preview-vs-gpt-5" title="Gemini 3.1 Flash Lite Preview vs GPT-5, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gemini-3-1-flash-lite-preview-vs-gpt-5">LLMBenchmark.ai, Gemini 3.1 Flash Lite Preview vs GPT-5</a></p>

Gemini 3.1 Flash Lite Preview or GPT-5: which to pick

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Math

Knowledge

Web design

Long documents

Everyday cost

Cost per solved task

At a glance

Benchmark by benchmark

What each workload costs

Chat turn

Repository review

Agent loop

Specification differences

Questions

Compare next