Claude Sonnet 5 vs Gemini 3.1 Pro Preview

Claude Sonnet 5 leads Gemini 3.1 Pro Preview on coding, 57.7 to 32.3 on the Vibe Coding Index, and Claude Sonnet 5 costs 1.2x less per output token ($10.00 vs $12.00 per million). Updated October 22, 2026; 108 benchmarks have a result for both.

Replace Claude Sonnet 5 Replace Gemini 3.1 Pro Preview

Claude Sonnet 5Anthropic

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

Gemini 3.1 Pro PreviewGoogle

Coding: 32.3
Overall: 54.0
Output $/M: $12.00

vs boards won of 108 shared, 2 tied

Claude Sonnet 5 or Gemini 3.1 Pro Preview: which to pick

Pick Claude Sonnet 5 for coding: it scores 57.7 on the Vibe Coding Index against 32.3 for Gemini 3.1 Pro Preview.

Pick Gemini 3.1 Pro Preview for a lower cost per solved task ($0.99 against $1.87) and a larger context window (1.05M against 1M tokens).

Model AClaude Sonnet 5Anthropic57.7/1006 independent benchmarks$1.87 per solved task Model BGemini 3.1 Pro PreviewGoogle32.3/1004 independent benchmarks$0.99 per solved task

1081325

Shared results: 108
Claude Sonnet 5 only: 13
Gemini 3.1 Pro Preview only: 25
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 32.3.
6 and 4 benchmarks behind the scores
Intelligence
AA Intelligence Index
Claude Sonnet 5
Claude Sonnet 5 leads, 38.2 against 29.7.
Same board, both measured
Agentic work
AA Agentic Index
Claude Sonnet 5
Claude Sonnet 5 leads, 43.6 against 8.2.
Same board, both measured
Reasoning
GPQA Diamond
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 95.5% against 88.9%.
Same board, both measured
Math
AIME
No call
Only Gemini 3.1 Pro Preview has a AIME result, 98.1%.
Directional only
Knowledge
MMLU Pro
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 91.0% against 87.5%.
Same board, both measured
Web design
Design Arena: websites
Claude Sonnet 5
Claude Sonnet 5 leads, 1274 against 1233.
Same board, both measured
Long documents
Listed context window
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Claude Sonnet 5
Claude Sonnet 5 $0.0070, Gemini 3.1 Pro Preview $0.0080 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
Gemini 3.1 Pro Preview
Claude Sonnet 5 $1.87, Gemini 3.1 Pro Preview $0.99.
Published attempt cost and pass rate

At a glance

Coding index: Claude Sonnet 5 57.7 from 6 benchmarks, Gemini 3.1 Pro Preview 32.3 from 4 benchmarks.
Widest category: Agentic work, 16.3 points apart on average over 17 shared benchmarks.
Widest single gap: ProofBench: Claude Sonnet 5 77.0% against Gemini 3.1 Pro Preview 26.0%, 51.0 points apart on a 0 to 100 scale.
Output price: Claude Sonnet 5 $10.00 against Gemini 3.1 Pro Preview $12.00 per million output tokens, 1.2x apart.
Context window: Claude Sonnet 5 takes 1M tokens, Gemini 3.1 Pro 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 Pro Preview	Ties
Coding	13	7	1 tie
Intelligence	1	0
Agentic work	16	1
Reasoning	2	11
Math	4	2
Knowledge	3	8
Web design	6	2
General	4	26	1 tie
All shared boards	49	57	2 ties

CodingLike-for-likeSix of these boards feed the Vibe Coding Index137

Coding benchmarks for Claude Sonnet 5 and Gemini 3.1 Pro Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Pro Preview	Leader
LiveBench coding	74.7%	Not measured	Only Claude Sonnet 5 measured
LMArena WebDev	1540	1447	Claude Sonnet 5
AA Coding Index	71.5	68.8	Claude Sonnet 5
LiveCodeBench (Vals AI)	82.4%	88.5%	Gemini 3.1 Pro Preview
SWE-bench Verified (Vals AI)	79.6%	78.8%	Claude Sonnet 5
Terminal-Bench 4 (Vals AI)	10.6%	2.5%	Claude Sonnet 5
Vibe Code Bench (Vals AI)	81.3%	32.0%	Claude Sonnet 5
Code migration (Vals AI)	44.4%	17.3%	Claude Sonnet 5
ProgramBench (Vals AI)	0.0%	0.0%	Tie
IOI (Vals AI)	45.0%	51.8%	Gemini 3.1 Pro Preview
Terminal-Bench 2.1 (Vals AI)	74.5%	70.8%	Claude Sonnet 5
Vibe Code Bench 1-100 (Vals AI)	13.8%	6.7%	Claude Sonnet 5
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%	58.7%	Gemini 3.1 Pro Preview
Terminal-Bench Hard (Artificial Analysis run)	Not measured	53.8%	Only Gemini 3.1 Pro Preview measured
Terminal-Bench	Not measured	80.2%	Only Gemini 3.1 Pro Preview measured
FrontierCode	42.7%	Not measured	Only Claude Sonnet 5 measured
GSO-Bench	37.3%	22.6%	Claude Sonnet 5
WeirdML	68.8%	72.1%	Gemini 3.1 Pro Preview
MirrorCode	Not measured	8.9%	Only Gemini 3.1 Pro Preview measured
ALE-Bench	1463.1	1160.6	Claude Sonnet 5
LMArena Text: coding	1483	1484	Gemini 3.1 Pro Preview
LMArena Text: software and IT	1474	1487	Gemini 3.1 Pro Preview
LMArena WebDev: React	1541	1438	Claude Sonnet 5
LMArena WebDev: HTML	1527	1490	Claude Sonnet 5
LMArena WebDev: from an image	1540	1481	Claude Sonnet 5
SciCode	10.7%	14.3%	Gemini 3.1 Pro Preview
Neither model has a result on the other 11 boards here

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

Intelligence benchmarks for Claude Sonnet 5 and Gemini 3.1 Pro Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Pro Preview	Leader
AA Intelligence Index	38.2	29.7	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 index161

Agentic work benchmarks for Claude Sonnet 5 and Gemini 3.1 Pro Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Pro Preview	Leader
AA Agentic Index	43.6	8.2	Claude Sonnet 5
Design Arena: agents building web apps	1245	1125	Claude Sonnet 5
Design Arena: agents building full-stack apps	1249	1068	Claude Sonnet 5
Design Arena: agents building mobile apps	1215	1094	Claude Sonnet 5
Design Arena: agents building Android apps	1227	1049	Claude Sonnet 5
Design Arena: agents building Godot games	1225	1236	Gemini 3.1 Pro Preview
Design Arena: agents building games	1227	1113	Claude Sonnet 5
Design Arena: HTML slides	1168	1103	Claude Sonnet 5
Design Arena: PowerPoint slides	1191	1041	Claude Sonnet 5
Design Arena: spreadsheets	1035	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%	0.0%	Claude Sonnet 5
Finance Agent (Vals AI)	53.9%	43.0%	Claude Sonnet 5
Tax Agent Bench (Vals AI)	29.4%	9.3%	Claude Sonnet 5
Legal Research Bench (Vals AI)	41.8%	20.7%	Claude Sonnet 5
Excel Modeling Benchmark (Vals AI)	66.3%	52.6%	Claude Sonnet 5
BioMysteryBench (Vals AI)	Not measured	60.0%	Only Gemini 3.1 Pro Preview measured
Terminal-Bench-Science (Vals AI)	5.7%	1.4%	Claude Sonnet 5
Vals Science Index	Not measured	27.4%	Only Gemini 3.1 Pro Preview measured
τ²-Bench Telecom	Not measured	95.6%	Only Gemini 3.1 Pro Preview measured
APEX-Agents	54.5%	35.1%	Claude Sonnet 5
METR time horizons	Not measured	77.0%	Only Gemini 3.1 Pro Preview measured
BALROG	Not measured	57.0%	Only Gemini 3.1 Pro Preview measured
DeepResearch Bench	Not measured	47.8%	Only Gemini 3.1 Pro Preview measured
PostTrainBench	Not measured	22.0%	Only Gemini 3.1 Pro Preview measured
Vending-Bench 2	$6,378	$911	Claude Sonnet 5
Neither model has a result on the other 13 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index211

Reasoning benchmarks for Claude Sonnet 5 and Gemini 3.1 Pro Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Pro Preview	Leader
GPQA Diamond	88.9%	95.5%	Gemini 3.1 Pro Preview
LiveBench reasoning	88.7%	Not measured	Only Claude Sonnet 5 measured
MysteryMechanism (Vals AI)	Not measured	20.7%	Only Gemini 3.1 Pro Preview measured
MMMU Pro (Vals AI)	83.0%	88.2%	Gemini 3.1 Pro Preview
GPQA Diamond (Artificial Analysis run)	91.1%	94.1%	Gemini 3.1 Pro Preview
Humanity's Last Exam (Artificial Analysis run)	41.3%	47.0%	Gemini 3.1 Pro Preview
GPQA Diamond (Epoch AI run)	90.5%	94.4%	Gemini 3.1 Pro Preview
ARC-AGI	Not measured	98.0%	Only Gemini 3.1 Pro Preview measured
ARC-AGI-2	Not measured	77.1%	Only Gemini 3.1 Pro Preview measured
SimpleBench	60.6%	79.6%	Gemini 3.1 Pro Preview
Chess puzzles	45.0%	51.0%	Gemini 3.1 Pro Preview
Mystery game puzzles	35.0%	34.0%	Claude Sonnet 5
EBR-bench	Not measured	14.3%	Only Gemini 3.1 Pro Preview measured
LMArena Text: hard prompts	1461	1485	Gemini 3.1 Pro Preview
LMArena Text: expert	1489	1483	Claude Sonnet 5
LMArena Text: hard prompts in English	1464	1480	Gemini 3.1 Pro Preview
LMArena Vision: diagrams	1293	1311	Gemini 3.1 Pro Preview
LMArena Vision: homework	1311	1316	Gemini 3.1 Pro Preview
Neither model has a result on the other 4 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index42

Math benchmarks for Claude Sonnet 5 and Gemini 3.1 Pro Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Pro Preview	Leader
AIME	Not measured	98.1%	Only Gemini 3.1 Pro Preview measured
OTIS Mock AIME	94.7%	95.6%	Gemini 3.1 Pro Preview
FrontierMath, tiers 1 to 3	65.6%	59.6%	Claude Sonnet 5
FrontierMath, tier 4	29.3%	26.8%	Claude Sonnet 5
ProofBench	77.0%	26.0%	Claude Sonnet 5
LMArena Text: math	1467	1486	Gemini 3.1 Pro Preview
LMArena Text: mathematical work	1481	1478	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 index38

Knowledge benchmarks for Claude Sonnet 5 and Gemini 3.1 Pro Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Pro Preview	Leader
MMLU Pro	87.5%	91.0%	Gemini 3.1 Pro Preview
LegalBench (Vals AI)	83.9%	87.4%	Gemini 3.1 Pro Preview
CaseLaw (Vals AI)	Not measured	64.8%	Only Gemini 3.1 Pro Preview measured
CorpFin (Vals AI)	67.0%	64.5%	Claude Sonnet 5
TaxEval (Vals AI)	75.6%	72.9%	Claude Sonnet 5
MortgageTax (Vals AI)	70.0%	69.4%	Claude Sonnet 5
MedQA (Vals AI)	Not measured	96.4%	Only Gemini 3.1 Pro Preview measured
MedCode (Vals AI)	47.5%	59.1%	Gemini 3.1 Pro Preview
SimpleQA Verified	33.7%	73.5%	Gemini 3.1 Pro Preview
LMArena Text: science	1460	1497	Gemini 3.1 Pro Preview
LMArena Text: medicine and healthcare	1442	1486	Gemini 3.1 Pro Preview
LMArena Text: legal and government	1454	1487	Gemini 3.1 Pro Preview
LMArena Text: business and finance	1436	1459	Gemini 3.1 Pro Preview
FACTS Benchmark Suite	Not measured	67.4%	Only Gemini 3.1 Pro Preview measured
Neither model has a result on the other 4 boards here

Web designLike-for-likePublic boards, shown as published, kept out of the index62

Web design benchmarks for Claude Sonnet 5 and Gemini 3.1 Pro Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Pro Preview	Leader
Design Arena: websites	1274	1233	Claude Sonnet 5
Design Arena: UI components	1277	1224	Claude Sonnet 5
Design Arena: game dev	1277	1202	Claude Sonnet 5
Design Arena: data viz	1251	1209	Claude Sonnet 5
Design Arena: 3D	1261	1234	Claude Sonnet 5
Design Arena: all code categories	1275	1231	Claude Sonnet 5
Design Arena: SVG	1192	1285	Gemini 3.1 Pro Preview
Design Arena: ASCII art	1207	1270	Gemini 3.1 Pro Preview
LiveBench design	82.0%	Not measured	Only Claude Sonnet 5 measured

GeneralLike-for-likePublic boards, shown as published, kept out of the index426

General benchmarks for Claude Sonnet 5 and Gemini 3.1 Pro Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Pro Preview	Leader
LiveBench data analysis	71.7%	Not measured	Only Claude Sonnet 5 measured
Public Benefits Bench (Vals AI)	66.0%	53.8%	Claude Sonnet 5
SAGE (Vals AI)	48.9%	48.7%	Claude Sonnet 5
MedScribe (Vals AI)	76.0%	76.1%	Gemini 3.1 Pro Preview
Vals Multimodal Index	68.8%	56.1%	Claude Sonnet 5
IFBench	Not measured	77.1%	Only Gemini 3.1 Pro Preview measured
Long context reasoning (AA-LCR)	82.0%	82.0%	Tie
DTBench	92.5%	97.1%	Gemini 3.1 Pro Preview
LMCA	50.0%	53.8%	Gemini 3.1 Pro Preview
CL-bench	Not measured	20.8%	Only Gemini 3.1 Pro Preview measured
Surface Evolver Bench	60.0%	Not measured	Only Claude Sonnet 5 measured
Furniture assembly	Not measured	26.7%	Only Gemini 3.1 Pro Preview measured
ExploitBench	Not measured	26.1%	Only Gemini 3.1 Pro Preview measured
CL-bench Life	Not measured	16.9%	Only Gemini 3.1 Pro Preview measured
LMArena Text	1442	1480	Gemini 3.1 Pro Preview
LMArena Text: instruction following	1452	1466	Gemini 3.1 Pro Preview
LMArena Text: creative writing	1416	1482	Gemini 3.1 Pro Preview
LMArena Vision	1273	1296	Gemini 3.1 Pro Preview
LMArena Text: English	1450	1478	Gemini 3.1 Pro Preview
LMArena Text: non-English	1431	1476	Gemini 3.1 Pro Preview
LMArena Text: Chinese	1478	1527	Gemini 3.1 Pro Preview
LMArena Text: German	1442	1490	Gemini 3.1 Pro Preview
LMArena Text: Japanese	1422	1491	Gemini 3.1 Pro Preview
LMArena Text: Korean	1412	1455	Gemini 3.1 Pro Preview
LMArena Text: French	1463	1487	Gemini 3.1 Pro Preview
LMArena Text: Spanish	1438	1481	Gemini 3.1 Pro Preview
LMArena Text: Russian	1450	1497	Gemini 3.1 Pro Preview
LMArena Text: Polish	1425	1498	Gemini 3.1 Pro Preview
LMArena Text: multi-turn	1453	1487	Gemini 3.1 Pro Preview
LMArena Text: longer queries	1462	1482	Gemini 3.1 Pro Preview
LMArena Text: writing and language	1436	1481	Gemini 3.1 Pro Preview
LMArena Text: entertainment and media	1411	1465	Gemini 3.1 Pro Preview
LMArena Vision: English	1275	1287	Gemini 3.1 Pro Preview
LMArena Vision: Chinese	1331	1364	Gemini 3.1 Pro Preview
LMArena Vision: reading text	1288	1304	Gemini 3.1 Pro Preview
LMArena Vision: humor	1261	1322	Gemini 3.1 Pro Preview
LMArena Vision: captioning	Not measured	1345	Only Gemini 3.1 Pro Preview measured
LMArena Vision: recognizing things	Not measured	1330	Only Gemini 3.1 Pro Preview measured
LMArena Vision: creative writing	1246	1324	Gemini 3.1 Pro Preview
LMArena Document	1466	1444	Claude Sonnet 5
Neither model has a result on the other 6 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 Pro Preview
Benchmark	Claude Sonnet 5	Gemini 3.1 Pro 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 Pro Preview$0.0080Fits in one request

Claude Sonnet 5 costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 5$0.130Fits in one request

Gemini 3.1 Pro Preview$0.136Fits in one request

Claude Sonnet 5 costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 5$0.500Fits in one request

Gemini 3.1 Pro Preview$0.520Fits in one request

Claude Sonnet 5 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 Pro Preview
Specification	Anthropic Claude Sonnet 5	Google Gemini 3.1 Pro Preview
Maker	Anthropic	Google
Weights	No public weights listed	No public weights listed
Released	June 30, 2026	February 19, 2026
Context window	1M	1.05M
Input $/Mtok	$2.00	$2.00
Output $/Mtok	$10.00	$12.00
Coding index	57.7	32.3
Independent measurements behind it	6	4
Cost per solved task	$1.87	$0.99
Source	OpenRouter listing	OpenRouter listing

Questions

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

Pick Claude Sonnet 5 for coding: it scores 57.7 on the Vibe Coding Index against 32.3 for Gemini 3.1 Pro Preview. Pick Gemini 3.1 Pro Preview for a lower cost per solved task ($0.99 against $1.87) and a larger context window (1.05M against 1M tokens).

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

Claude Sonnet 5 costs $2.00 per million input tokens and $10.00 per million output tokens; Gemini 3.1 Pro Preview costs $2.00 and $12.00. Per solved SWE-bench Verified task, Claude Sonnet 5 costs $1.87 and Gemini 3.1 Pro Preview $0.99.

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

Gemini 3.1 Pro Preview, with 1.05M tokens against 1M.

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

108 benchmarks have a result for both models as of October 22, 2026. Claude Sonnet 5's coding index rests on 6 independent benchmarks and Gemini 3.1 Pro Preview's on 4. Where only one model has a result, the page says so instead of naming a winner.

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Claude Sonnet 5 or Gemini 3.1 Pro 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