Gemini 3.1 Flash Lite Preview vs GPT-5 Mini

GPT-5 Mini leads Gemini 3.1 Flash Lite Preview on coding, 34.2 to 22.7 on the Vibe Coding Index, and Gemini 3.1 Flash Lite Preview costs 1.3x less per output token ($1.50 vs $2.00 per million). Updated October 22, 2026; 63 benchmarks have a result for both.

Replace Gemini 3.1 Flash Lite Preview Replace GPT-5 Mini

Gemini 3.1 Flash Lite PreviewGoogle

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

GPT-5 MiniOpenAI

Coding: 34.2
Overall: 43.7
Output $/M: $2.00

vs boards won of 63 shared

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

Pick GPT-5 Mini for coding: it scores 34.2 on the Vibe Coding Index against 22.7 for Gemini 3.1 Flash Lite Preview, though on 2 benchmarks against 3.

Pick Gemini 3.1 Flash Lite Preview for output tokens 1.3x cheaper ($1.50 vs $2.00 per million) and a larger context window (1.05M against 400K tokens).

Model AGemini 3.1 Flash Lite PreviewGoogle22.7/1003 independent benchmarks$0.18 per solved task Model BGPT-5 MiniOpenAI34.2/1002 independent benchmarks$0.08 per solved task

631638

Shared results: 63
Gemini 3.1 Flash Lite Preview only: 16
GPT-5 Mini only: 38
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 Mini
GPT-5 Mini scores 34.2 against 22.7.
3 and 2 benchmarks behind the scores
Intelligence
AA Intelligence Index
GPT-5 Mini
GPT-5 Mini leads, 20.6 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
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview leads, 81.1% against 80.3%.
Same board, both measured
Math
AIME
GPT-5 Mini
GPT-5 Mini leads, 91.5% against 83.3%.
Same board, both measured
Knowledge
MMLU Pro
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview leads, 86.2% against 82.2%.
Same board, both measured
Web design
Design Arena: websites
GPT-5 Mini
GPT-5 Mini leads, 1125 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 Mini $0.0013 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
GPT-5 Mini
Gemini 3.1 Flash Lite Preview $0.18, GPT-5 Mini $0.08.
Published attempt cost and pass rate

At a glance

Coding index: Gemini 3.1 Flash Lite Preview 22.7 from 3 benchmarks, GPT-5 Mini 34.2 from 2 benchmarks.
Widest category: General, 9.3 points apart on average over 27 shared benchmarks.
Widest single gap: MedScribe (Vals AI): Gemini 3.1 Flash Lite Preview 63.9% against GPT-5 Mini 80.6%, 16.7 points apart on a 0 to 100 scale.
Output price: Gemini 3.1 Flash Lite Preview $1.50 against GPT-5 Mini $2.00 per million output tokens, 1.3x apart.
Context window: Gemini 3.1 Flash Lite Preview takes 1.05M tokens, GPT-5 Mini 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 Mini
Coding	2	3
Intelligence	0	1
Reasoning	7	0
Math	2	1
Knowledge	9	3
Web design	2	6
General	26	1
All shared boards	48	15

CodingLike-for-likeSix of these boards feed the Vibe Coding Index23

Coding benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5 Mini
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5 Mini	Leader
SWE-bench Verified	Not measured	59.8%	Only GPT-5 Mini measured
SWE-bench Multilingual	Not measured	39.7%	Only GPT-5 Mini measured
LMArena WebDev	1257	Not measured	Only Gemini 3.1 Flash Lite Preview measured
AA Coding Index	34.7	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LiveCodeBench (Vals AI)	80.1%	86.6%	GPT-5 Mini
SWE-bench Verified (Vals AI)	62.8%	60.8%	Gemini 3.1 Flash Lite Preview
Vibe Code Bench (Vals AI)	0.0%	14.2%	GPT-5 Mini
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	83.8%	Only GPT-5 Mini measured
SciCode	Not measured	39.0%	Only GPT-5 Mini measured
Terminal-Bench Hard (Artificial Analysis run)	Not measured	33.3%	Only GPT-5 Mini measured
Terminal-Bench	Not measured	34.8%	Only GPT-5 Mini measured
WeirdML	Not measured	52.7%	Only GPT-5 Mini measured
ALE-Bench	797.7	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: coding	1400	1406	GPT-5 Mini
LMArena Text: software and IT	1413	1394	Gemini 3.1 Flash Lite Preview
LMArena WebDev: React	1245	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena WebDev: HTML	1276	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena WebDev: from an image	1336	Not measured	Only Gemini 3.1 Flash Lite Preview measured
SciCode	4.6%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
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 Mini
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5 Mini	Leader
AA Intelligence Index	15.6	20.6	GPT-5 Mini
Epoch Capabilities Index	Not measured	145.3	Only GPT-5 Mini measured

Agentic workDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared

Agentic work benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5 Mini
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5 Mini	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	71.1%	Only GPT-5 Mini measured
Vending-Bench 2	Not measured	-$31	Only GPT-5 Mini measured
Berkeley Function Calling Leaderboard (BFCL)	Not measured	55.5%	Only GPT-5 Mini measured
Neither model has a result on the other 33 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index70

Reasoning benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5 Mini
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5 Mini	Leader
GPQA Diamond	81.1%	80.3%	Gemini 3.1 Flash Lite Preview
MMMU Pro (Vals AI)	82.5%	78.9%	Gemini 3.1 Flash Lite Preview
GPQA Diamond (Artificial Analysis run)	Not measured	82.8%	Only GPT-5 Mini measured
Humanity's Last Exam (Artificial Analysis run)	Not measured	21.5%	Only GPT-5 Mini measured
GPQA Diamond (Epoch AI run)	Not measured	75.0%	Only GPT-5 Mini measured
ARC-AGI	Not measured	54.3%	Only GPT-5 Mini measured
ARC-AGI-2	Not measured	4.4%	Only GPT-5 Mini measured
Chess puzzles	Not measured	24.0%	Only GPT-5 Mini measured
Mystery game puzzles	Not measured	10.0%	Only GPT-5 Mini measured
VPCT	Not measured	40.2%	Only GPT-5 Mini measured
LMArena Text: hard prompts	1407	1380	Gemini 3.1 Flash Lite Preview
LMArena Text: expert	1398	1379	Gemini 3.1 Flash Lite Preview
LMArena Text: hard prompts in English	1403	1383	Gemini 3.1 Flash Lite Preview
LMArena Vision: diagrams	1242	1202	Gemini 3.1 Flash Lite Preview
LMArena Vision: homework	1271	1210	Gemini 3.1 Flash Lite Preview
Kagi LLM Benchmark	Not measured	70.3%	Only GPT-5 Mini measured
Neither model has a result on the other 6 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 Mini
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5 Mini	Leader
AIME	83.3%	91.5%	GPT-5 Mini
MATH 500 (Vals AI)	Not measured	94.8%	Only GPT-5 Mini measured
MGSM (Vals AI)	Not measured	92.6%	Only GPT-5 Mini measured
AA Math Index	Not measured	90.7	Only GPT-5 Mini measured
AIME 2025 (Artificial Analysis run)	Not measured	90.7%	Only GPT-5 Mini measured
OTIS Mock AIME	Not measured	86.7%	Only GPT-5 Mini measured
FrontierMath, tiers 1 to 3	Not measured	46.7%	Only GPT-5 Mini measured
FrontierMath, tier 4	Not measured	12.2%	Only GPT-5 Mini measured
ProofBench	Not measured	9.0%	Only GPT-5 Mini measured
MATH level 5	Not measured	97.8%	Only GPT-5 Mini measured
LMArena Text: math	1428	1378	Gemini 3.1 Flash Lite Preview
LMArena Text: mathematical work	1417	1380	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 index93

Knowledge benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5 Mini
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5 Mini	Leader
MMLU Pro	86.2%	82.2%	Gemini 3.1 Flash Lite Preview
LegalBench (Vals AI)	83.8%	81.8%	Gemini 3.1 Flash Lite Preview
CaseLaw (Vals AI)	55.0%	68.5%	GPT-5 Mini
CorpFin (Vals AI)	59.4%	60.2%	GPT-5 Mini
TaxEval (Vals AI)	71.8%	75.2%	GPT-5 Mini
MortgageTax (Vals AI)	68.0%	66.9%	Gemini 3.1 Flash Lite Preview
MedQA (Vals AI)	Not measured	96.1%	Only GPT-5 Mini measured
MedCode (Vals AI)	47.6%	43.0%	Gemini 3.1 Flash Lite Preview
MMLU Pro (Artificial Analysis run)	Not measured	83.7%	Only GPT-5 Mini measured
SimpleQA Verified	Not measured	21.6%	Only GPT-5 Mini measured
LMArena Text: science	1425	1371	Gemini 3.1 Flash Lite Preview
LMArena Text: medicine and healthcare	1428	1380	Gemini 3.1 Flash Lite Preview
LMArena Text: legal and government	1418	1375	Gemini 3.1 Flash Lite Preview
LMArena Text: business and finance	1389	1358	Gemini 3.1 Flash Lite Preview
FACTS Benchmark Suite	51.4%	38.6%	Gemini 3.1 Flash Lite Preview
Neither model has a result on the other 3 boards here

Web designLike-for-likePublic boards, shown as published, kept out of the index26

Web design benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5 Mini
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5 Mini	Leader
Design Arena: websites	1082	1125	GPT-5 Mini
Design Arena: UI components	1069	1103	GPT-5 Mini
Design Arena: game dev	1029	1129	GPT-5 Mini
Design Arena: data viz	1045	1131	GPT-5 Mini
Design Arena: 3D	1047	1036	Gemini 3.1 Flash Lite Preview
Design Arena: all code categories	1072	1114	GPT-5 Mini
Design Arena: SVG	1052	1091	GPT-5 Mini
Design Arena: ASCII art	1167	1125	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 index261

General benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5 Mini
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5 Mini	Leader
SAGE (Vals AI)	49.5%	43.0%	Gemini 3.1 Flash Lite Preview
MedScribe (Vals AI)	63.9%	80.6%	GPT-5 Mini
Vals Multimodal Index	41.4%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
IFBench	Not measured	75.4%	Only GPT-5 Mini measured
Long context reasoning (AA-LCR)	Not measured	72.3%	Only GPT-5 Mini measured
DTBench	Not measured	80.5%	Only GPT-5 Mini measured
LMCA	Not measured	34.2%	Only GPT-5 Mini measured
Fiction.LiveBench	Not measured	69.4%	Only GPT-5 Mini measured
Creative writing (Lech Mazur)	Not measured	83.1%	Only GPT-5 Mini measured
LMArena Text	1416	1373	Gemini 3.1 Flash Lite Preview
LMArena Text: instruction following	1377	1357	Gemini 3.1 Flash Lite Preview
LMArena Text: creative writing	1401	1325	Gemini 3.1 Flash Lite Preview
LMArena Vision	1240	1202	Gemini 3.1 Flash Lite Preview
LMArena Text: English	1414	1379	Gemini 3.1 Flash Lite Preview
LMArena Text: non-English	1410	1363	Gemini 3.1 Flash Lite Preview
LMArena Text: Chinese	1460	1386	Gemini 3.1 Flash Lite Preview
LMArena Text: German	1430	1366	Gemini 3.1 Flash Lite Preview
LMArena Text: Japanese	1413	1341	Gemini 3.1 Flash Lite Preview
LMArena Text: Korean	1392	1308	Gemini 3.1 Flash Lite Preview
LMArena Text: French	1424	1386	Gemini 3.1 Flash Lite Preview
LMArena Text: Spanish	1421	1354	Gemini 3.1 Flash Lite Preview
LMArena Text: Russian	1420	1362	Gemini 3.1 Flash Lite Preview
LMArena Text: Polish	1443	1378	Gemini 3.1 Flash Lite Preview
LMArena Text: multi-turn	1417	1363	Gemini 3.1 Flash Lite Preview
LMArena Text: longer queries	1394	1355	Gemini 3.1 Flash Lite Preview
LMArena Text: writing and language	1408	1344	Gemini 3.1 Flash Lite Preview
LMArena Text: entertainment and media	1386	1340	Gemini 3.1 Flash Lite Preview
LMArena Vision: English	1232	1216	Gemini 3.1 Flash Lite Preview
LMArena Vision: Chinese	1278	1214	Gemini 3.1 Flash Lite Preview
LMArena Vision: reading text	1246	1199	Gemini 3.1 Flash Lite Preview
LMArena Vision: humor	1266	1205	Gemini 3.1 Flash Lite Preview
LMArena Vision: captioning	1259	1217	Gemini 3.1 Flash Lite Preview
LMArena Vision: recognizing things	1308	1226	Gemini 3.1 Flash Lite Preview
LMArena Vision: creative writing	1248	1181	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 Mini
Benchmark	Gemini 3.1 Flash Lite Preview	GPT-5 Mini	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 Mini$0.0013Fits 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 Mini$0.018Fits 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 Mini$0.070Fits 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 Mini
Specification	Google Gemini 3.1 Flash Lite Preview	OpenAI GPT-5 Mini
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	$0.25
Output $/Mtok	$1.50	$2.00
Coding index	22.7	34.2
Independent measurements behind it	3	2
Cost per solved task	$0.18	$0.08
Source	OpenRouter listing	OpenRouter listing

Questions

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

Pick GPT-5 Mini for coding: it scores 34.2 on the Vibe Coding Index against 22.7 for Gemini 3.1 Flash Lite Preview, though on 2 benchmarks against 3. Pick Gemini 3.1 Flash Lite Preview for output tokens 1.3x cheaper ($1.50 vs $2.00 per million) and a larger context window (1.05M against 400K tokens).

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

Gemini 3.1 Flash Lite Preview costs $0.25 per million input tokens and $1.50 per million output tokens; GPT-5 Mini costs $0.25 and $2.00. Per solved SWE-bench Verified task, Gemini 3.1 Flash Lite Preview costs $0.18 and GPT-5 Mini $0.08.

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

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 Mini comparison based on?

63 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 Mini's on 2. Where only one model has a result, the page says so instead of naming a winner.

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Gemini 3.1 Flash Lite Preview or GPT-5 Mini: 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