Claude Sonnet 5 vs Gemini 3.1 Flash Lite Preview

Claude Sonnet 5 leads Gemini 3.1 Flash Lite Preview on coding, 57.7 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 21, 2026; 74 benchmarks have a result for both.

Replace Claude Sonnet 5 Replace Gemini 3.1 Flash Lite Preview

Claude Sonnet 5Anthropic

Coding: 57.7
Overall: 63.2
Output $/M: $10.00

Gemini 3.1 Flash Lite PreviewGoogle

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

vs boards won of 74 shared, 1 tied

Claude Sonnet 5 or Gemini 3.1 Flash Lite Preview: which to pick

Pick Claude Sonnet 5 for coding: it scores 57.7 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 $1.87).

Model AClaude Sonnet 5Anthropic57.7/1006 independent benchmarks$1.87 per solved task Model BGemini 3.1 Flash Lite PreviewGoogle22.7/1003 independent benchmarks$0.18 per solved task

74475

Shared results: 74
Claude Sonnet 5 only: 47
Gemini 3.1 Flash Lite Preview only: 5
Like-for-like categories: 8 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
Claude Sonnet 5
Claude Sonnet 5 scores 57.7 against 22.7.
6 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
Claude Sonnet 5
Claude Sonnet 5 leads, 38.2 against 15.6.
Same board, both measured
Agentic work
AA Agentic Index
Claude Sonnet 5
Claude Sonnet 5 leads, 43.6 against 1.6.
Same board, both measured
Reasoning
GPQA Diamond
Claude Sonnet 5
Claude Sonnet 5 leads, 88.9% against 81.1%.
Same board, both measured
Math
AIME
No call
Only Gemini 3.1 Flash Lite Preview has a AIME result, 83.3%.
Directional only
Knowledge
MMLU Pro
Claude Sonnet 5
Claude Sonnet 5 leads, 87.5% against 86.2%.
Same board, both measured
Web design
Design Arena: websites
Claude Sonnet 5
Claude Sonnet 5 leads, 1274 against 1083.
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 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 3.1 Flash Lite Preview
Claude Sonnet 5 $0.0070, Gemini 3.1 Flash Lite Preview $0.0010 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
Gemini 3.1 Flash Lite Preview
Claude Sonnet 5 $1.87, Gemini 3.1 Flash Lite Preview $0.18.
Published attempt cost and pass rate

At a glance

Coding index: Claude Sonnet 5 57.7 from 6 benchmarks, Gemini 3.1 Flash Lite Preview 22.7 from 3 benchmarks.
Widest category: Agentic work, 37.7 points apart on average over 5 shared benchmarks.
Widest single gap: Vibe Code Bench (Vals AI): Claude Sonnet 5 81.3% against Gemini 3.1 Flash Lite Preview 0.0%, 81.3 points apart on a 0 to 100 scale.
Output price: Claude Sonnet 5 $10.00 against Gemini 3.1 Flash Lite Preview $1.50 per million output tokens, 6.7x apart.
Context window: Claude Sonnet 5 takes 1M tokens, Gemini 3.1 Flash Lite Preview 1.05M.

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	Claude Sonnet 5	Gemini 3.1 Flash Lite Preview	Ties
Coding	14	0	1 tie
Intelligence	1	0
Agentic work	5	0
Reasoning	7	0
Math	2	0
Knowledge	9	1
Web design	8	0
General	22	4
All shared boards	68	5	1 tie

CodingLike-for-likeSix of these boards feed the Vibe Coding Index140

Coding benchmarks for Claude Sonnet 5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Flash Lite Preview	Leader
LiveBench coding	74.7%	Not measured	Only Claude Sonnet 5 measured
LMArena WebDev	1540	1257	Claude Sonnet 5
AA Coding Index	71.5	34.7	Claude Sonnet 5
LiveCodeBench (Vals AI)	82.4%	80.1%	Claude Sonnet 5
SWE-bench Verified (Vals AI)	79.6%	62.8%	Claude Sonnet 5
Terminal-Bench 4 (Vals AI)	10.6%	Not measured	Only Claude Sonnet 5 measured
Vibe Code Bench (Vals AI)	81.3%	0.0%	Claude Sonnet 5
Code migration (Vals AI)	44.4%	4.6%	Claude Sonnet 5
ProgramBench (Vals AI)	0.0%	0.0%	Tie
IOI (Vals AI)	45.0%	Not measured	Only Claude Sonnet 5 measured
Terminal-Bench 2.1 (Vals AI)	74.5%	34.1%	Claude Sonnet 5
Vibe Code Bench 1-100 (Vals AI)	13.8%	Not measured	Only Claude Sonnet 5 measured
SkillsBench (Vals AI)	46.5%	Not measured	Only Claude Sonnet 5 measured
CyberBench (Vals AI)	70.3%	Not measured	Only Claude Sonnet 5 measured
SciCode	54.3%	Not measured	Only Claude Sonnet 5 measured
FrontierCode	42.7%	Not measured	Only Claude Sonnet 5 measured
GSO-Bench	37.3%	Not measured	Only Claude Sonnet 5 measured
WeirdML	68.8%	Not measured	Only Claude Sonnet 5 measured
ALE-Bench	1463.1	797.7	Claude Sonnet 5
LMArena Text: coding	1483	1400	Claude Sonnet 5
LMArena Text: software and IT	1474	1413	Claude Sonnet 5
LMArena WebDev: React	1541	1245	Claude Sonnet 5
LMArena WebDev: HTML	1527	1276	Claude Sonnet 5
LMArena WebDev: from an image	1540	1336	Claude Sonnet 5
SciCode	10.7%	4.6%	Claude Sonnet 5
Neither model has a result on the other 14 boards here

IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10

Intelligence benchmarks for Claude Sonnet 5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Flash Lite Preview	Leader
AA Intelligence Index	38.2	15.6	Claude Sonnet 5
Epoch Capabilities Index	156.9	Not measured	Only Claude Sonnet 5 measured

Agentic workLike-for-likePublic boards, shown as published, kept out of the index50

Agentic work benchmarks for Claude Sonnet 5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Flash Lite Preview	Leader
AA Agentic Index	43.6	1.6	Claude Sonnet 5
Design Arena: agents building web apps	1245	Not measured	Only Claude Sonnet 5 measured
Design Arena: agents building full-stack apps	1249	Not measured	Only Claude Sonnet 5 measured
Design Arena: agents building mobile apps	1215	Not measured	Only Claude Sonnet 5 measured
Design Arena: agents building Android apps	1225	Not measured	Only Claude Sonnet 5 measured
Design Arena: agents building Godot games	1225	Not measured	Only Claude Sonnet 5 measured
Design Arena: agents building games	1227	Not measured	Only Claude Sonnet 5 measured
Design Arena: HTML slides	1218	Not measured	Only Claude Sonnet 5 measured
Design Arena: PowerPoint slides	1216	Not measured	Only Claude Sonnet 5 measured
Design Arena: spreadsheets	1021	Not measured	Only Claude Sonnet 5 measured
LiveBench research	82.8%	Not measured	Only Claude Sonnet 5 measured
LiveBench browser	72.0%	Not measured	Only Claude Sonnet 5 measured
LiveBench long agentic	39.0%	Not measured	Only Claude Sonnet 5 measured
SREBench (Vals AI)	0.4%	Not measured	Only Claude Sonnet 5 measured
Finance Agent (Vals AI)	53.9%	30.0%	Claude Sonnet 5
Tax Agent Bench (Vals AI)	29.4%	3.1%	Claude Sonnet 5
Legal Research Bench (Vals AI)	41.8%	3.4%	Claude Sonnet 5
Excel Modeling Benchmark (Vals AI)	66.3%	8.6%	Claude Sonnet 5
Terminal-Bench-Science (Vals AI)	5.7%	Not measured	Only Claude Sonnet 5 measured
APEX-Agents	54.5%	Not measured	Only Claude Sonnet 5 measured
Vending-Bench 2	$6,378	Not measured	Only Claude Sonnet 5 measured
Neither model has a result on the other 20 boards here

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

Reasoning benchmarks for Claude Sonnet 5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Flash Lite Preview	Leader
GPQA Diamond	88.9%	81.1%	Claude Sonnet 5
LiveBench reasoning	88.7%	Not measured	Only Claude Sonnet 5 measured
MMMU Pro (Vals AI)	83.0%	82.5%	Claude Sonnet 5
GPQA Diamond (Artificial Analysis run)	91.1%	Not measured	Only Claude Sonnet 5 measured
Humanity's Last Exam (Artificial Analysis run)	41.3%	Not measured	Only Claude Sonnet 5 measured
GPQA Diamond (Epoch AI run)	90.5%	Not measured	Only Claude Sonnet 5 measured
SimpleBench	60.6%	Not measured	Only Claude Sonnet 5 measured
Chess puzzles	45.0%	Not measured	Only Claude Sonnet 5 measured
Mystery game puzzles	35.0%	Not measured	Only Claude Sonnet 5 measured
LMArena Text: hard prompts	1461	1407	Claude Sonnet 5
LMArena Text: expert	1489	1398	Claude Sonnet 5
LMArena Text: hard prompts in English	1464	1403	Claude Sonnet 5
LMArena Vision: diagrams	1293	1242	Claude Sonnet 5
LMArena Vision: homework	1311	1271	Claude Sonnet 5
Neither model has a result on the other 8 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index20

Math benchmarks for Claude Sonnet 5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Flash Lite Preview	Leader
AIME	Not measured	83.3%	Only Gemini 3.1 Flash Lite Preview measured
OTIS Mock AIME	94.7%	Not measured	Only Claude Sonnet 5 measured
FrontierMath, tiers 1 to 3	65.6%	Not measured	Only Claude Sonnet 5 measured
FrontierMath, tier 4	29.3%	Not measured	Only Claude Sonnet 5 measured
ProofBench	77.0%	Not measured	Only Claude Sonnet 5 measured
LMArena Text: math	1467	1428	Claude Sonnet 5
LMArena Text: mathematical work	1481	1417	Claude Sonnet 5
Neither model has a result on the other 6 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index91

Knowledge benchmarks for Claude Sonnet 5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Flash Lite Preview	Leader
MMLU Pro	87.5%	86.2%	Claude Sonnet 5
LegalBench (Vals AI)	83.9%	83.8%	Claude Sonnet 5
CaseLaw (Vals AI)	Not measured	55.0%	Only Gemini 3.1 Flash Lite Preview measured
CorpFin (Vals AI)	67.0%	59.4%	Claude Sonnet 5
TaxEval (Vals AI)	75.6%	71.8%	Claude Sonnet 5
MortgageTax (Vals AI)	70.0%	68.0%	Claude Sonnet 5
MedCode (Vals AI)	47.5%	47.6%	Gemini 3.1 Flash Lite Preview
SimpleQA Verified	33.7%	Not measured	Only Claude Sonnet 5 measured
LMArena Text: science	1460	1425	Claude Sonnet 5
LMArena Text: medicine and healthcare	1442	1428	Claude Sonnet 5
LMArena Text: legal and government	1454	1418	Claude Sonnet 5
LMArena Text: business and finance	1436	1389	Claude Sonnet 5
FACTS Benchmark Suite	Not measured	51.4%	Only Gemini 3.1 Flash Lite Preview measured
Neither model has a result on the other 5 boards here

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

Web design benchmarks for Claude Sonnet 5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Flash Lite Preview	Leader
Design Arena: websites	1274	1083	Claude Sonnet 5
Design Arena: UI components	1280	1072	Claude Sonnet 5
Design Arena: game dev	1278	1029	Claude Sonnet 5
Design Arena: data viz	1251	1045	Claude Sonnet 5
Design Arena: 3D	1261	1048	Claude Sonnet 5
Design Arena: all code categories	1276	1072	Claude Sonnet 5
Design Arena: SVG	1193	1052	Claude Sonnet 5
Design Arena: ASCII art	1207	1167	Claude Sonnet 5
LiveBench design	82.0%	Not measured	Only Claude Sonnet 5 measured

GeneralLike-for-likePublic boards, shown as published, kept out of the index224

General benchmarks for Claude Sonnet 5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Flash Lite Preview	Leader
LiveBench data analysis	71.7%	Not measured	Only Claude Sonnet 5 measured
Public Benefits Bench (Vals AI)	66.0%	Not measured	Only Claude Sonnet 5 measured
SAGE (Vals AI)	48.9%	49.5%	Gemini 3.1 Flash Lite Preview
MedScribe (Vals AI)	76.0%	63.9%	Claude Sonnet 5
Vals Multimodal Index	68.8%	41.4%	Claude Sonnet 5
Long context reasoning (AA-LCR)	82.0%	Not measured	Only Claude Sonnet 5 measured
DTBench	92.5%	Not measured	Only Claude Sonnet 5 measured
LMCA	50.0%	Not measured	Only Claude Sonnet 5 measured
Surface Evolver Bench	60.0%	Not measured	Only Claude Sonnet 5 measured
LMArena Text	1442	1416	Claude Sonnet 5
LMArena Text: instruction following	1452	1377	Claude Sonnet 5
LMArena Text: creative writing	1416	1401	Claude Sonnet 5
LMArena Vision	1273	1240	Claude Sonnet 5
LMArena Text: English	1450	1414	Claude Sonnet 5
LMArena Text: non-English	1431	1410	Claude Sonnet 5
LMArena Text: Chinese	1478	1460	Claude Sonnet 5
LMArena Text: German	1442	1430	Claude Sonnet 5
LMArena Text: Japanese	1422	1413	Claude Sonnet 5
LMArena Text: Korean	1412	1392	Claude Sonnet 5
LMArena Text: French	1463	1424	Claude Sonnet 5
LMArena Text: Spanish	1438	1421	Claude Sonnet 5
LMArena Text: Russian	1450	1420	Claude Sonnet 5
LMArena Text: Polish	1425	1443	Gemini 3.1 Flash Lite Preview
LMArena Text: multi-turn	1453	1417	Claude Sonnet 5
LMArena Text: longer queries	1462	1394	Claude Sonnet 5
LMArena Text: writing and language	1436	1408	Claude Sonnet 5
LMArena Text: entertainment and media	1411	1386	Claude Sonnet 5
LMArena Vision: English	1275	1232	Claude Sonnet 5
LMArena Vision: Chinese	1331	1278	Claude Sonnet 5
LMArena Vision: reading text	1288	1246	Claude Sonnet 5
LMArena Vision: humor	1261	1266	Gemini 3.1 Flash Lite Preview
LMArena Vision: captioning	Not measured	1259	Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: recognizing things	Not measured	1308	Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: creative writing	1246	1248	Gemini 3.1 Flash Lite Preview
LMArena Document	1466	Not measured	Only Claude Sonnet 5 measured
Neither model has a result on the other 11 boards here

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

Image generation benchmarks for Claude Sonnet 5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Flash Lite Preview	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

Claude Sonnet 5$0.0070Fits in one request

Gemini 3.1 Flash Lite Preview$0.0010Fits in one request

Gemini 3.1 Flash Lite Preview costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 5$0.130Fits in one request

Gemini 3.1 Flash Lite Preview$0.017Fits in one request

Gemini 3.1 Flash Lite Preview costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 5$0.500Fits in one request

Gemini 3.1 Flash Lite Preview$0.065Fits 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 Claude Sonnet 5 and Gemini 3.1 Flash Lite Preview
Specification	Anthropic Claude Sonnet 5	Google Gemini 3.1 Flash Lite Preview
Maker	Anthropic	Google
Weights	No public weights listed	No public weights listed
Released	June 30, 2026	March 3, 2026
Context window	1M	1.05M
Input $/Mtok	$2.00	$0.25
Output $/Mtok	$10.00	$1.50
Coding index	57.7	22.7
Independent measurements behind it	6	3
Cost per solved task	$1.87	$0.18
Source	OpenRouter listing	OpenRouter listing

Questions

Is Claude Sonnet 5 better than Gemini 3.1 Flash Lite Preview for coding?

Pick Claude Sonnet 5 for coding: it scores 57.7 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 $1.87).

Which is cheaper, Claude Sonnet 5 or Gemini 3.1 Flash Lite Preview?

Claude Sonnet 5 costs $2.00 per million input tokens and $10.00 per million output tokens; Gemini 3.1 Flash Lite Preview costs $0.25 and $1.50. Per solved SWE-bench Verified task, Claude Sonnet 5 costs $1.87 and Gemini 3.1 Flash Lite Preview $0.18.

Which has the bigger context window, Claude Sonnet 5 or Gemini 3.1 Flash Lite Preview?

Gemini 3.1 Flash Lite Preview, with 1.05M tokens against 1M.

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

74 benchmarks have a result for both models as of October 21, 2026. Claude Sonnet 5's coding index rests on 6 independent benchmarks and Gemini 3.1 Flash Lite Preview's on 3. Where only one model has a result, the page says so instead of naming a winner.

Compare next

Embed this comparison on your site

Free under CC BY 4.0, while the source link stays visible. Preview the frame · Terms and other embeds

<iframe src="https://llmbenchmark.ai/embed/compare/claude-sonnet-5-vs-gemini-3-1-flash-lite-preview" title="Claude Sonnet 5 vs Gemini 3.1 Flash Lite Preview, 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/claude-sonnet-5-vs-gemini-3-1-flash-lite-preview">LLMBenchmark.ai, Claude Sonnet 5 vs Gemini 3.1 Flash Lite Preview</a></p>

Claude Sonnet 5 or Gemini 3.1 Flash Lite Preview: 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