Claude Opus 4.5 vs Gemini 3.1 Pro Preview

Claude Opus 4.5 leads Gemini 3.1 Pro Preview on coding, 44.0 to 32.3 on the Vibe Coding Index, and Gemini 3.1 Pro Preview costs 2.1x less per output token ($12.00 vs $25.00 per million). Updated October 22, 2026; 91 benchmarks have a result for both.

Replace Claude Opus 4.5 Replace Gemini 3.1 Pro Preview

Claude Opus 4.5Anthropic

Coding: 44.0
Overall: 55.7
Output $/M: $25.00

Gemini 3.1 Pro PreviewGoogle

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

vs boards won of 91 shared, 1 tied

Claude Opus 4.5 or Gemini 3.1 Pro Preview: which to pick

Pick Claude Opus 4.5 for coding: it scores 44.0 on the Vibe Coding Index against 32.3 for Gemini 3.1 Pro Preview, though on 3 benchmarks against 4.

Pick Gemini 3.1 Pro Preview for output tokens 2.1x cheaper ($12.00 vs $25.00 per million) and a lower cost per solved task ($0.99 against $1.37).

Model AClaude Opus 4.5Anthropic44.0/1003 independent benchmarks$1.37 per solved task Model BGemini 3.1 Pro PreviewGoogle32.3/1004 independent benchmarks$0.99 per solved task

911742

Shared results: 91
Claude Opus 4.5 only: 17
Gemini 3.1 Pro Preview only: 42
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 Opus 4.5
Claude Opus 4.5 scores 44.0 against 32.3.
3 and 4 benchmarks behind the scores
Intelligence
AA Intelligence Index
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 29.7 against 29.1.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Gemini 3.1 Pro Preview has a AA Agentic Index result, 8.2.
Directional only
Reasoning
GPQA Diamond
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 95.5% against 85.9%.
Same board, both measured
Math
AIME
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 98.1% against 95.4%.
Same board, both measured
Knowledge
MMLU Pro
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 91.0% against 87.3%.
Same board, both measured
Web design
Design Arena: websites
Claude Opus 4.5
Claude Opus 4.5 leads, 1247 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 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 3.1 Pro Preview
Claude Opus 4.5 $0.018, 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 Opus 4.5 $1.37, Gemini 3.1 Pro Preview $0.99.
Published attempt cost and pass rate

At a glance

Coding index: Claude Opus 4.5 44.0 from 3 benchmarks, Gemini 3.1 Pro Preview 32.3 from 4 benchmarks.
Widest category: Reasoning, 12.4 points apart on average over 14 shared benchmarks.
Widest single gap: ARC-AGI-2: Claude Opus 4.5 37.6% against Gemini 3.1 Pro Preview 77.1%, 39.5 points apart on a 0 to 100 scale.
Output price: Claude Opus 4.5 $25.00 against Gemini 3.1 Pro Preview $12.00 per million output tokens, 2.1x apart.
Context window: Claude Opus 4.5 takes 200K 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 Opus 4.5	Gemini 3.1 Pro Preview	Ties
Coding	5	7
Intelligence	0	1
Agentic work	6	3
Reasoning	2	11	1 tie
Math	1	6
Knowledge	2	12
Web design	5	3
General	6	20
All shared boards	27	63	1 tie

CodingLike-for-likeSix of these boards feed the Vibe Coding Index57

Coding benchmarks for Claude Opus 4.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 4.5	Gemini 3.1 Pro Preview	Leader
SWE-bench Verified	79.2%	Not measured	Only Claude Opus 4.5 measured
SWE-bench (full test set)	52.6%	Not measured	Only Claude Opus 4.5 measured
SWE-bench Multilingual	70.7%	Not measured	Only Claude Opus 4.5 measured
LMArena WebDev	1494	1447	Claude Opus 4.5
AA Coding Index	Not measured	68.8	Only Gemini 3.1 Pro Preview measured
LiveCodeBench (Vals AI)	83.7%	88.5%	Gemini 3.1 Pro Preview
SWE-bench Verified (Vals AI)	76.4%	78.8%	Gemini 3.1 Pro Preview
Terminal-Bench 4 (Vals AI)	Not measured	2.5%	Only Gemini 3.1 Pro Preview measured
Vibe Code Bench (Vals AI)	20.6%	32.0%	Gemini 3.1 Pro Preview
Code migration (Vals AI)	Not measured	17.3%	Only Gemini 3.1 Pro Preview measured
ProgramBench (Vals AI)	Not measured	0.0%	Only Gemini 3.1 Pro Preview measured
IOI (Vals AI)	Not measured	51.8%	Only Gemini 3.1 Pro Preview measured
Terminal-Bench 2.1 (Vals AI)	Not measured	70.8%	Only Gemini 3.1 Pro Preview measured
Vibe Code Bench 1-100 (Vals AI)	Not measured	6.7%	Only Gemini 3.1 Pro Preview measured
LiveCodeBench (Artificial Analysis run)	87.1%	Not measured	Only Claude Opus 4.5 measured
SciCode	Not measured	58.7%	Only Gemini 3.1 Pro Preview measured
Terminal-Bench Hard (Artificial Analysis run)	47.0%	53.8%	Gemini 3.1 Pro Preview
Terminal-Bench	63.1%	80.2%	Gemini 3.1 Pro Preview
GSO-Bench	26.5%	22.6%	Claude Opus 4.5
WeirdML	63.7%	72.1%	Gemini 3.1 Pro Preview
MirrorCode	Not measured	8.9%	Only Gemini 3.1 Pro Preview measured
Cybench	82.0%	Not measured	Only Claude Opus 4.5 measured
ALE-Bench	Not measured	1160.6	Only Gemini 3.1 Pro Preview measured
LMArena Text: coding	1503	1484	Claude Opus 4.5
LMArena Text: software and IT	1483	1487	Gemini 3.1 Pro Preview
LMArena WebDev: React	1478	1438	Claude Opus 4.5
LMArena WebDev: HTML	1510	1490	Claude Opus 4.5
LMArena WebDev: from an image	Not measured	1481	Only Gemini 3.1 Pro Preview measured
SciCode	Not measured	14.3%	Only Gemini 3.1 Pro Preview measured
Neither model has a result on the other 10 boards here

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

Intelligence benchmarks for Claude Opus 4.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 4.5	Gemini 3.1 Pro Preview	Leader
AA Intelligence Index	29.1	29.7	Gemini 3.1 Pro Preview
Epoch Capabilities Index	150.1	Not measured	Only Claude Opus 4.5 measured

Agentic workLike-for-likePublic boards, shown as published, kept out of the index63

Agentic work benchmarks for Claude Opus 4.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 4.5	Gemini 3.1 Pro Preview	Leader
AA Agentic Index	Not measured	8.2	Only Gemini 3.1 Pro Preview measured
Design Arena: agents building web apps	1159	1125	Claude Opus 4.5
Design Arena: agents building full-stack apps	1156	1068	Claude Opus 4.5
Design Arena: agents building mobile apps	1189	1094	Claude Opus 4.5
Design Arena: agents building Android apps	1176	1049	Claude Opus 4.5
Design Arena: agents building Godot games	Not measured	1236	Only Gemini 3.1 Pro Preview measured
Design Arena: agents building games	Not measured	1113	Only Gemini 3.1 Pro Preview measured
Design Arena: HTML slides	Not measured	1103	Only Gemini 3.1 Pro Preview measured
Design Arena: PowerPoint slides	Not measured	1041	Only Gemini 3.1 Pro Preview measured
SREBench (Vals AI)	Not measured	0.0%	Only Gemini 3.1 Pro Preview measured
Finance Agent (Vals AI)	Not measured	43.0%	Only Gemini 3.1 Pro Preview measured
Tax Agent Bench (Vals AI)	Not measured	9.3%	Only Gemini 3.1 Pro Preview measured
Legal Research Bench (Vals AI)	Not measured	20.7%	Only Gemini 3.1 Pro Preview measured
Excel Modeling Benchmark (Vals AI)	Not measured	52.6%	Only Gemini 3.1 Pro Preview measured
BioMysteryBench (Vals AI)	Not measured	60.0%	Only Gemini 3.1 Pro Preview measured
Terminal-Bench-Science (Vals AI)	Not measured	1.4%	Only Gemini 3.1 Pro Preview measured
Vals Science Index	Not measured	27.4%	Only Gemini 3.1 Pro Preview measured
τ²-Bench Telecom	89.5%	95.6%	Gemini 3.1 Pro Preview
APEX-Agents	Not measured	35.1%	Only Gemini 3.1 Pro Preview measured
METR time horizons	75.0%	77.0%	Gemini 3.1 Pro Preview
Remote Labor Index	3.8%	Not measured	Only Claude Opus 4.5 measured
GDPval	45.5%	Not measured	Only Claude Opus 4.5 measured
BALROG	43.5%	57.0%	Gemini 3.1 Pro Preview
DeepResearch Bench	54.8%	47.8%	Claude Opus 4.5
PostTrainBench	Not measured	22.0%	Only Gemini 3.1 Pro Preview measured
OSWorld	66.3%	Not measured	Only Claude Opus 4.5 measured
Vending-Bench 2	$4,967	$911	Claude Opus 4.5
Berkeley Function Calling Leaderboard (BFCL)	77.5%	Not measured	Only Claude Opus 4.5 measured
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 Opus 4.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 4.5	Gemini 3.1 Pro Preview	Leader
GPQA Diamond	85.9%	95.5%	Gemini 3.1 Pro Preview
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)	86.6%	94.1%	Gemini 3.1 Pro Preview
Humanity's Last Exam (Artificial Analysis run)	30.1%	47.0%	Gemini 3.1 Pro Preview
GPQA Diamond (Epoch AI run)	86.0%	94.4%	Gemini 3.1 Pro Preview
ARC-AGI	80.0%	98.0%	Gemini 3.1 Pro Preview
ARC-AGI-2	37.6%	77.1%	Gemini 3.1 Pro Preview
SimpleBench	62.0%	79.6%	Gemini 3.1 Pro Preview
Chess puzzles	14.0%	51.0%	Gemini 3.1 Pro Preview
Mystery game puzzles	22.0%	34.0%	Gemini 3.1 Pro Preview
EBR-bench	14.3%	14.3%	Tie
VPCT	40.0%	Not measured	Only Claude Opus 4.5 measured
LMArena Text: hard prompts	1476	1485	Gemini 3.1 Pro Preview
LMArena Text: expert	1487	1483	Claude Opus 4.5
LMArena Text: hard prompts in English	1482	1480	Claude Opus 4.5
LMArena Vision: diagrams	Not measured	1311	Only Gemini 3.1 Pro Preview measured
LMArena Vision: homework	Not measured	1316	Only Gemini 3.1 Pro Preview measured
Kagi LLM Benchmark	80.2%	Not measured	Only Claude Opus 4.5 measured
Neither model has a result on the other 3 boards here

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

Math benchmarks for Claude Opus 4.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 4.5	Gemini 3.1 Pro Preview	Leader
AIME	95.4%	98.1%	Gemini 3.1 Pro Preview
MGSM (Vals AI)	95.2%	Not measured	Only Claude Opus 4.5 measured
AA Math Index	91.3	Not measured	Only Claude Opus 4.5 measured
AIME 2025 (Artificial Analysis run)	91.3%	Not measured	Only Claude Opus 4.5 measured
OTIS Mock AIME	86.1%	95.6%	Gemini 3.1 Pro Preview
FrontierMath, tiers 1 to 3	34.4%	59.6%	Gemini 3.1 Pro Preview
FrontierMath, tier 4	4.9%	26.8%	Gemini 3.1 Pro Preview
ProofBench	36.0%	26.0%	Claude Opus 4.5
LMArena Text: math	1463	1486	Gemini 3.1 Pro Preview
LMArena Text: mathematical work	1468	1478	Gemini 3.1 Pro Preview
Neither model has a result on the other 3 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index212

Knowledge benchmarks for Claude Opus 4.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 4.5	Gemini 3.1 Pro Preview	Leader
MMLU Pro	87.3%	91.0%	Gemini 3.1 Pro Preview
LegalBench (Vals AI)	84.6%	87.4%	Gemini 3.1 Pro Preview
CaseLaw (Vals AI)	62.6%	64.8%	Gemini 3.1 Pro Preview
CorpFin (Vals AI)	65.1%	64.5%	Claude Opus 4.5
TaxEval (Vals AI)	74.9%	72.9%	Claude Opus 4.5
MortgageTax (Vals AI)	68.7%	69.4%	Gemini 3.1 Pro Preview
MedQA (Vals AI)	95.9%	96.4%	Gemini 3.1 Pro Preview
MedCode (Vals AI)	49.2%	59.1%	Gemini 3.1 Pro Preview
MMLU Pro (Artificial Analysis run)	89.5%	Not measured	Only Claude Opus 4.5 measured
SimpleQA Verified	45.7%	73.5%	Gemini 3.1 Pro Preview
GeoBench	75.0%	Not measured	Only Claude Opus 4.5 measured
LMArena Text: science	1454	1497	Gemini 3.1 Pro Preview
LMArena Text: medicine and healthcare	1444	1486	Gemini 3.1 Pro Preview
LMArena Text: legal and government	1459	1487	Gemini 3.1 Pro Preview
LMArena Text: business and finance	1448	1459	Gemini 3.1 Pro Preview
FACTS Benchmark Suite	43.9%	67.4%	Gemini 3.1 Pro Preview
Neither model has a result on the other 2 boards here

Web designLike-for-likePublic boards, shown as published, kept out of the index53

Web design benchmarks for Claude Opus 4.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 4.5	Gemini 3.1 Pro Preview	Leader
Design Arena: websites	1247	1233	Claude Opus 4.5
Design Arena: UI components	1235	1224	Claude Opus 4.5
Design Arena: game dev	1228	1202	Claude Opus 4.5
Design Arena: data viz	1243	1209	Claude Opus 4.5
Design Arena: 3D	1213	1234	Gemini 3.1 Pro Preview
Design Arena: all code categories	1242	1231	Claude Opus 4.5
Design Arena: SVG	1180	1285	Gemini 3.1 Pro Preview
Design Arena: ASCII art	1190	1270	Gemini 3.1 Pro Preview
Neither model has a result on the other 1 board here

GeneralLike-for-likePublic boards, shown as published, kept out of the index620

General benchmarks for Claude Opus 4.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 4.5	Gemini 3.1 Pro Preview	Leader
Public Benefits Bench (Vals AI)	Not measured	53.8%	Only Gemini 3.1 Pro Preview measured
SAGE (Vals AI)	52.1%	48.7%	Claude Opus 4.5
MedScribe (Vals AI)	85.3%	76.1%	Claude Opus 4.5
Vals Multimodal Index	Not measured	56.1%	Only Gemini 3.1 Pro Preview measured
IFBench	58.0%	77.1%	Gemini 3.1 Pro Preview
Long context reasoning (AA-LCR)	77.3%	82.0%	Gemini 3.1 Pro Preview
DTBench	89.9%	97.1%	Gemini 3.1 Pro Preview
LMCA	44.5%	53.8%	Gemini 3.1 Pro Preview
CL-bench	21.1%	20.8%	Claude Opus 4.5
Furniture assembly	28.3%	26.7%	Claude Opus 4.5
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	1451	1480	Gemini 3.1 Pro Preview
LMArena Text: instruction following	1478	1466	Claude Opus 4.5
LMArena Text: creative writing	1445	1482	Gemini 3.1 Pro Preview
LMArena Vision	Not measured	1296	Only Gemini 3.1 Pro Preview measured
LMArena Text: English	1461	1478	Gemini 3.1 Pro Preview
LMArena Text: non-English	1438	1476	Gemini 3.1 Pro Preview
LMArena Text: Chinese	1470	1527	Gemini 3.1 Pro Preview
LMArena Text: German	1449	1490	Gemini 3.1 Pro Preview
LMArena Text: Japanese	1417	1491	Gemini 3.1 Pro Preview
LMArena Text: Korean	1424	1455	Gemini 3.1 Pro Preview
LMArena Text: French	1471	1487	Gemini 3.1 Pro Preview
LMArena Text: Spanish	1457	1481	Gemini 3.1 Pro Preview
LMArena Text: Russian	1447	1497	Gemini 3.1 Pro Preview
LMArena Text: Polish	1439	1498	Gemini 3.1 Pro Preview
LMArena Text: multi-turn	1466	1487	Gemini 3.1 Pro Preview
LMArena Text: longer queries	1479	1482	Gemini 3.1 Pro Preview
LMArena Text: writing and language	1452	1481	Gemini 3.1 Pro Preview
LMArena Text: entertainment and media	1434	1465	Gemini 3.1 Pro Preview
LMArena Vision: English	Not measured	1287	Only Gemini 3.1 Pro Preview measured
LMArena Vision: Chinese	Not measured	1364	Only Gemini 3.1 Pro Preview measured
LMArena Vision: reading text	Not measured	1304	Only Gemini 3.1 Pro Preview measured
LMArena Vision: humor	Not measured	1322	Only Gemini 3.1 Pro Preview measured
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	Not measured	1324	Only Gemini 3.1 Pro Preview measured
LMArena Document	1462	1444	Claude Opus 4.5
Neither model has a result on the other 8 boards here

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

Image generation benchmarks for Claude Opus 4.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 4.5	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 Opus 4.5$0.018Fits in one request

Gemini 3.1 Pro Preview$0.0080Fits in one request

Gemini 3.1 Pro Preview costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.5$0.325Fits in one request

Gemini 3.1 Pro Preview$0.136Fits in one request

Gemini 3.1 Pro Preview costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.5$1.25Exceeds the context window

Gemini 3.1 Pro Preview$0.520Fits in one request

Gemini 3.1 Pro 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 Opus 4.5 and Gemini 3.1 Pro Preview
Specification	Anthropic Claude Opus 4.5	Google Gemini 3.1 Pro Preview
Maker	Anthropic	Google
Weights	No public weights listed	No public weights listed
Released	November 24, 2025	February 19, 2026
Context window	200K	1.05M
Input $/Mtok	$5.00	$2.00
Output $/Mtok	$25.00	$12.00
Coding index	44.0	32.3
Independent measurements behind it	3	4
Cost per solved task	$1.37	$0.99
Source	OpenRouter listing	OpenRouter listing

Questions

Is Claude Opus 4.5 better than Gemini 3.1 Pro Preview for coding?

Pick Claude Opus 4.5 for coding: it scores 44.0 on the Vibe Coding Index against 32.3 for Gemini 3.1 Pro Preview, though on 3 benchmarks against 4. Pick Gemini 3.1 Pro Preview for output tokens 2.1x cheaper ($12.00 vs $25.00 per million) and a lower cost per solved task ($0.99 against $1.37).

Which is cheaper, Claude Opus 4.5 or Gemini 3.1 Pro Preview?

Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; Gemini 3.1 Pro Preview costs $2.00 and $12.00. Per solved SWE-bench Verified task, Claude Opus 4.5 costs $1.37 and Gemini 3.1 Pro Preview $0.99.

Which has the bigger context window, Claude Opus 4.5 or Gemini 3.1 Pro Preview?

Gemini 3.1 Pro Preview, with 1.05M tokens against 200K.

How many benchmarks is the Claude Opus 4.5 vs Gemini 3.1 Pro Preview comparison based on?

91 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.5's coding index rests on 3 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 Opus 4.5 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