Gemini 2.5 Pro vs Gemini 3.5 Flash Lite

Gemini 3.5 Flash Lite leads Gemini 2.5 Pro on coding, 49.0 to 19.1 on the Vibe Coding Index, and Gemini 3.5 Flash Lite costs 4.0x less per output token ($2.50 vs $10.00 per million). Updated October 22, 2026; 63 benchmarks have a result for both.

Replace Gemini 2.5 Pro Replace Gemini 3.5 Flash Lite

Gemini 2.5 ProGoogle

Coding: 19.1
Overall: 41.8
Output $/M: $10.00

Gemini 3.5 Flash LiteGoogle

Coding: 49.0
Overall: 49.8
Output $/M: $2.50

vs boards won of 63 shared, 1 tied

Gemini 2.5 Pro or Gemini 3.5 Flash Lite: which to pick

Pick Gemini 3.5 Flash Lite for coding: it scores 49.0 on the Vibe Coding Index against 19.1 for Gemini 2.5 Pro.

Pick Gemini 2.5 Pro for work measured by SciCode or WeirdML, where it leads.

Model AGemini 2.5 ProGoogle19.1/1003 independent benchmarks$0.64 per solved task Model BGemini 3.5 Flash LiteGoogle49.0/1003 independent benchmarks$0.41 per solved task

632722

Shared results: 63
Gemini 2.5 Pro only: 27
Gemini 3.5 Flash Lite only: 22
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
Gemini 3.5 Flash Lite
Gemini 3.5 Flash Lite scores 49.0 against 19.1.
3 benchmarks behind each score
Intelligence
AA Intelligence Index
Gemini 3.5 Flash Lite
Gemini 3.5 Flash Lite leads, 22.2 against 16.1.
Same board, both measured
Agentic work
AA Agentic Index
Gemini 3.5 Flash Lite
Gemini 3.5 Flash Lite leads, 14.3 against 1.6.
Same board, both measured
Reasoning
GPQA Diamond
No call
Only Gemini 3.5 Flash Lite has a GPQA Diamond result, 83.8%.
Directional only
Knowledge
MMLU Pro
No call
Only Gemini 3.5 Flash Lite has a MMLU Pro result, 85.8%.
Directional only
Web design
Design Arena: websites
No call
Only Gemini 2.5 Pro has a Design Arena: websites result, 1167.
Directional only
Long documents
Listed context window
No call
Both take 1.05M tokens.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 3.5 Flash Lite
Gemini 2.5 Pro $0.0063, Gemini 3.5 Flash Lite $0.0015 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
Gemini 3.5 Flash Lite
Gemini 2.5 Pro $0.64, Gemini 3.5 Flash Lite $0.41.
Published attempt cost and pass rate

At a glance

Coding index: Gemini 2.5 Pro 19.1 from 3 benchmarks, Gemini 3.5 Flash Lite 49.0 from 3 benchmarks.
Widest category: Coding, 16.9 points apart on average over 9 shared benchmarks.
Widest single gap: Vibe Code Bench (Vals AI): Gemini 2.5 Pro 0.4% against Gemini 3.5 Flash Lite 37.2%, 36.8 points apart on a 0 to 100 scale.
Output price: Gemini 2.5 Pro $10.00 against Gemini 3.5 Flash Lite $2.50 per million output tokens, 4.0x apart.
Context window: Both take 1.05M tokens.

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 2.5 Pro	Gemini 3.5 Flash Lite	Ties
Coding	3	6
Intelligence	1	1
Agentic work	0	1
Reasoning	6	4
Math	3	1	1 tie
Knowledge	8	0
General	19	9
All shared boards	40	22	1 tie

CodingLike-for-likeSix of these boards feed the Vibe Coding Index36

Coding benchmarks for Gemini 2.5 Pro and Gemini 3.5 Flash Lite
Benchmark	Gemini 2.5 Pro	Gemini 3.5 Flash Lite	Leader
SWE-bench Verified	53.6%	Not measured	Only Gemini 2.5 Pro measured
LMArena WebDev	1226	1435	Gemini 3.5 Flash Lite
AA Coding Index	33.3	49.3	Gemini 3.5 Flash Lite
LiveCodeBench (Vals AI)	Not measured	79.0%	Only Gemini 3.5 Flash Lite measured
SWE-bench Verified (Vals AI)	54.4%	75.0%	Gemini 3.5 Flash Lite
Vibe Code Bench (Vals AI)	0.4%	37.2%	Gemini 3.5 Flash Lite
Code migration (Vals AI)	Not measured	6.2%	Only Gemini 3.5 Flash Lite measured
ProgramBench (Vals AI)	Not measured	0.0%	Only Gemini 3.5 Flash Lite measured
Terminal-Bench 2.1 (Vals AI)	Not measured	50.2%	Only Gemini 3.5 Flash Lite measured
CyberBench (Vals AI)	Not measured	59.1%	Only Gemini 3.5 Flash Lite measured
LiveCodeBench (Artificial Analysis run)	80.1%	Not measured	Only Gemini 2.5 Pro measured
SciCode	46.3%	41.3%	Gemini 2.5 Pro
Terminal-Bench Hard (Artificial Analysis run)	26.5%	Not measured	Only Gemini 2.5 Pro measured
Terminal-Bench	32.6%	Not measured	Only Gemini 2.5 Pro measured
GSO-Bench	3.9%	Not measured	Only Gemini 2.5 Pro measured
WeirdML	54.0%	39.0%	Gemini 2.5 Pro
ALE-Bench	Not measured	765.3	Only Gemini 3.5 Flash Lite measured
LMArena Text: coding	1452	1453	Gemini 3.5 Flash Lite
LMArena Text: software and IT	1459	1451	Gemini 2.5 Pro
LMArena WebDev: React	Not measured	1408	Only Gemini 3.5 Flash Lite measured
LMArena WebDev: HTML	1235	Not measured	Only Gemini 2.5 Pro measured
LMArena WebDev: from an image	1285	1448	Gemini 3.5 Flash Lite
SciCode	Not measured	6.2%	Only Gemini 3.5 Flash Lite measured
Neither model has a result on the other 16 boards here

IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11

Intelligence benchmarks for Gemini 2.5 Pro and Gemini 3.5 Flash Lite
Benchmark	Gemini 2.5 Pro	Gemini 3.5 Flash Lite	Leader
AA Intelligence Index	16.1	22.2	Gemini 3.5 Flash Lite
Epoch Capabilities Index	145.1	144.9	Gemini 2.5 Pro

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

Agentic work benchmarks for Gemini 2.5 Pro and Gemini 3.5 Flash Lite
Benchmark	Gemini 2.5 Pro	Gemini 3.5 Flash Lite	Leader
AA Agentic Index	1.6	14.3	Gemini 3.5 Flash Lite
Finance Agent (Vals AI)	Not measured	47.4%	Only Gemini 3.5 Flash Lite measured
Tax Agent Bench (Vals AI)	Not measured	7.2%	Only Gemini 3.5 Flash Lite measured
Legal Research Bench (Vals AI)	Not measured	13.9%	Only Gemini 3.5 Flash Lite measured
Excel Modeling Benchmark (Vals AI)	Not measured	43.2%	Only Gemini 3.5 Flash Lite measured
τ²-Bench Telecom	54.1%	Not measured	Only Gemini 2.5 Pro measured
APEX-Agents	Not measured	29.3%	Only Gemini 3.5 Flash Lite measured
GDPval	23.3%	Not measured	Only Gemini 2.5 Pro measured
DeepResearch Bench	41.5%	Not measured	Only Gemini 2.5 Pro measured
Vending-Bench 2	$574	Not measured	Only Gemini 2.5 Pro measured
BrowseComp-Plus	29.5%	Not measured	Only Gemini 2.5 Pro measured
Neither model has a result on the other 30 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index64

Reasoning benchmarks for Gemini 2.5 Pro and Gemini 3.5 Flash Lite
Benchmark	Gemini 2.5 Pro	Gemini 3.5 Flash Lite	Leader
GPQA Diamond	Not measured	83.8%	Only Gemini 3.5 Flash Lite measured
MMMU Pro (Vals AI)	Not measured	83.6%	Only Gemini 3.5 Flash Lite measured
GPQA Diamond (Artificial Analysis run)	84.4%	83.8%	Gemini 2.5 Pro
Humanity's Last Exam (Artificial Analysis run)	22.5%	18.8%	Gemini 2.5 Pro
GPQA Diamond (Epoch AI run)	85.3%	83.3%	Gemini 2.5 Pro
ARC-AGI	41.0%	53.5%	Gemini 3.5 Flash Lite
ARC-AGI-2	4.9%	10.3%	Gemini 3.5 Flash Lite
Chess puzzles	Not measured	21.0%	Only Gemini 3.5 Flash Lite measured
Mystery game puzzles	Not measured	19.0%	Only Gemini 3.5 Flash Lite measured
LMArena Text: hard prompts	1455	1441	Gemini 2.5 Pro
LMArena Text: expert	1452	1434	Gemini 2.5 Pro
LMArena Text: hard prompts in English	1453	1440	Gemini 2.5 Pro
LMArena Vision: diagrams	1274	1284	Gemini 3.5 Flash Lite
LMArena Vision: homework	1281	1291	Gemini 3.5 Flash Lite
Kagi LLM Benchmark	70.3%	Not measured	Only Gemini 2.5 Pro measured
Neither model has a result on the other 7 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index31

Math benchmarks for Gemini 2.5 Pro and Gemini 3.5 Flash Lite
Benchmark	Gemini 2.5 Pro	Gemini 3.5 Flash Lite	Leader
AA Math Index	87.7	Not measured	Only Gemini 2.5 Pro measured
AIME 2025 (Artificial Analysis run)	87.7%	Not measured	Only Gemini 2.5 Pro measured
OTIS Mock AIME	84.7%	71.1%	Gemini 2.5 Pro
FrontierMath, tiers 1 to 3	24.6%	26.0%	Gemini 3.5 Flash Lite
FrontierMath, tier 4	0.0%	0.0%	Tie
ProofBench	Not measured	13.0%	Only Gemini 3.5 Flash Lite measured
LMArena Text: math	1450	1434	Gemini 2.5 Pro
LMArena Text: mathematical work	1454	1433	Gemini 2.5 Pro
Neither model has a result on the other 5 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index80

Knowledge benchmarks for Gemini 2.5 Pro and Gemini 3.5 Flash Lite
Benchmark	Gemini 2.5 Pro	Gemini 3.5 Flash Lite	Leader
MMLU Pro	Not measured	85.8%	Only Gemini 3.5 Flash Lite measured
LegalBench (Vals AI)	Not measured	84.1%	Only Gemini 3.5 Flash Lite measured
CaseLaw (Vals AI)	63.9%	Not measured	Only Gemini 2.5 Pro measured
CorpFin (Vals AI)	60.8%	60.7%	Gemini 2.5 Pro
TaxEval (Vals AI)	Not measured	72.6%	Only Gemini 3.5 Flash Lite measured
MortgageTax (Vals AI)	68.9%	68.7%	Gemini 2.5 Pro
MedCode (Vals AI)	50.6%	43.5%	Gemini 2.5 Pro
MMLU Pro (Artificial Analysis run)	86.2%	Not measured	Only Gemini 2.5 Pro measured
LMArena Text: science	1480	1451	Gemini 2.5 Pro
LMArena Text: medicine and healthcare	1476	1438	Gemini 2.5 Pro
LMArena Text: legal and government	1480	1431	Gemini 2.5 Pro
LMArena Text: business and finance	1439	1423	Gemini 2.5 Pro
FACTS Benchmark Suite	61.5%	53.5%	Gemini 2.5 Pro
Neither model has a result on the other 5 boards here

Web designDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared

Web design benchmarks for Gemini 2.5 Pro and Gemini 3.5 Flash Lite
Benchmark	Gemini 2.5 Pro	Gemini 3.5 Flash Lite	Leader
Design Arena: websites	1167	Not measured	Only Gemini 2.5 Pro measured
Design Arena: UI components	1137	Not measured	Only Gemini 2.5 Pro measured
Design Arena: game dev	1111	Not measured	Only Gemini 2.5 Pro measured
Design Arena: data viz	1222	Not measured	Only Gemini 2.5 Pro measured
Design Arena: 3D	1080	Not measured	Only Gemini 2.5 Pro measured
Design Arena: all code categories	1152	Not measured	Only Gemini 2.5 Pro measured
Neither model has a result on the other 3 boards here

GeneralLike-for-likePublic boards, shown as published, kept out of the index199

General benchmarks for Gemini 2.5 Pro and Gemini 3.5 Flash Lite
Benchmark	Gemini 2.5 Pro	Gemini 3.5 Flash Lite	Leader
Public Benefits Bench (Vals AI)	Not measured	51.8%	Only Gemini 3.5 Flash Lite measured
SAGE (Vals AI)	41.9%	47.3%	Gemini 3.5 Flash Lite
MedScribe (Vals AI)	73.5%	70.9%	Gemini 2.5 Pro
IFBench	48.7%	Not measured	Only Gemini 2.5 Pro measured
Long context reasoning (AA-LCR)	69.0%	76.0%	Gemini 3.5 Flash Lite
DTBench	82.4%	83.5%	Gemini 3.5 Flash Lite
LMCA	34.8%	37.6%	Gemini 3.5 Flash Lite
Creative writing (Lech Mazur)	83.8%	Not measured	Only Gemini 2.5 Pro measured
LMArena Text	1458	1435	Gemini 2.5 Pro
LMArena Text: instruction following	1437	1419	Gemini 2.5 Pro
LMArena Text: creative writing	1454	1421	Gemini 2.5 Pro
LMArena Vision	1263	1269	Gemini 3.5 Flash Lite
LMArena Text: English	1458	1438	Gemini 2.5 Pro
LMArena Text: non-English	1452	1427	Gemini 2.5 Pro
LMArena Text: Chinese	1507	1468	Gemini 2.5 Pro
LMArena Text: German	1487	1454	Gemini 2.5 Pro
LMArena Text: Japanese	1461	1426	Gemini 2.5 Pro
LMArena Text: Korean	1434	1407	Gemini 2.5 Pro
LMArena Text: French	1473	1451	Gemini 2.5 Pro
LMArena Text: Spanish	1474	1441	Gemini 2.5 Pro
LMArena Text: Russian	1461	1443	Gemini 2.5 Pro
LMArena Text: Polish	1479	1437	Gemini 2.5 Pro
LMArena Text: multi-turn	1453	1445	Gemini 2.5 Pro
LMArena Text: longer queries	1449	1435	Gemini 2.5 Pro
LMArena Text: writing and language	1454	1428	Gemini 2.5 Pro
LMArena Text: entertainment and media	1441	1414	Gemini 2.5 Pro
LMArena Vision: English	1261	1269	Gemini 3.5 Flash Lite
LMArena Vision: Chinese	1300	1311	Gemini 3.5 Flash Lite
LMArena Vision: reading text	1270	1280	Gemini 3.5 Flash Lite
LMArena Vision: humor	1262	1287	Gemini 3.5 Flash Lite
LMArena Vision: captioning	1304	Not measured	Only Gemini 2.5 Pro measured
LMArena Vision: recognizing things	1283	Not measured	Only Gemini 2.5 Pro measured
LMArena Vision: creative writing	1265	1260	Gemini 2.5 Pro
LMArena Document	1421	Not measured	Only Gemini 2.5 Pro measured
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 2.5 Pro and Gemini 3.5 Flash Lite
Benchmark	Gemini 2.5 Pro	Gemini 3.5 Flash Lite	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 2.5 Pro$0.0063Fits in one request

Gemini 3.5 Flash Lite$0.0015Fits in one request

Gemini 3.5 Flash Lite costs less

Repository review

50K input + 3K output tokens

Gemini 2.5 Pro$0.092Fits in one request

Gemini 3.5 Flash Lite$0.022Fits in one request

Gemini 3.5 Flash Lite costs less

Agent loop

200K input + 10K output tokens

Gemini 2.5 Pro$0.350Fits in one request

Gemini 3.5 Flash Lite$0.085Fits in one request

Gemini 3.5 Flash Lite 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 2.5 Pro and Gemini 3.5 Flash Lite
Specification	Google Gemini 2.5 Pro	Google Gemini 3.5 Flash Lite
Maker	Google	Google
Weights	No public weights listed	No public weights listed
Released	June 17, 2025	July 21, 2026
Context window	1.05M	1.05M
Input $/Mtok	$1.25	$0.30
Output $/Mtok	$10.00	$2.50
Coding index	19.1	49.0
Independent measurements behind it	3	3
Cost per solved task	$0.64	$0.41
Source	OpenRouter listing	OpenRouter listing

Questions

Is Gemini 2.5 Pro better than Gemini 3.5 Flash Lite for coding?

Pick Gemini 3.5 Flash Lite for coding: it scores 49.0 on the Vibe Coding Index against 19.1 for Gemini 2.5 Pro. Pick Gemini 2.5 Pro for work measured by SciCode or WeirdML, where it leads.

Which is cheaper, Gemini 2.5 Pro or Gemini 3.5 Flash Lite?

Gemini 2.5 Pro costs $1.25 per million input tokens and $10.00 per million output tokens; Gemini 3.5 Flash Lite costs $0.30 and $2.50. Per solved SWE-bench Verified task, Gemini 2.5 Pro costs $0.64 and Gemini 3.5 Flash Lite $0.41.

Which has the bigger context window, Gemini 2.5 Pro or Gemini 3.5 Flash Lite?

Neither: both take 1.05M tokens.

How many benchmarks is the Gemini 2.5 Pro vs Gemini 3.5 Flash Lite comparison based on?

63 benchmarks have a result for both models as of October 22, 2026. Gemini 2.5 Pro's coding index rests on 3 independent benchmarks and Gemini 3.5 Flash Lite's on 3. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gemini-2-5-pro-vs-gemini-3-5-flash-lite">LLMBenchmark.ai, Gemini 2.5 Pro vs Gemini 3.5 Flash Lite</a></p>

Gemini 2.5 Pro or Gemini 3.5 Flash Lite: which to pick

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

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