Claude Opus 5.5 vs Gemini 3.1 Pro Preview

Claude Opus 5.5 leads Gemini 3.1 Pro Preview on coding, 88.8 to 32.3 on the Vibe Coding Index, and Gemini 3.1 Pro Preview costs 1.7x less per output token ($12.00 vs $20.00 per million). Updated October 22, 2026; 88 benchmarks have a result for both.

Replace Claude Opus 5.5 Replace Gemini 3.1 Pro Preview

Claude Opus 5.5Anthropic

Coding: 88.8
Overall: 87.1
Output $/M: $20.00

Gemini 3.1 Pro PreviewGoogle

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

vs boards won of 88 shared

Claude Opus 5.5 or Gemini 3.1 Pro Preview: which to pick

Pick Claude Opus 5.5 for coding: it scores 88.8 on the Vibe Coding Index against 32.3 for Gemini 3.1 Pro Preview.

Pick Gemini 3.1 Pro Preview for output tokens 1.7x cheaper ($12.00 vs $20.00 per million) and a larger context window (1.05M against 1M tokens).

Model AClaude Opus 5.5Anthropic88.8/1005 independent benchmarksNo cost per solved task Model BGemini 3.1 Pro PreviewGoogle32.3/1004 independent benchmarks$0.99 per solved task

882145

Shared results: 88
Claude Opus 5.5 only: 21
Gemini 3.1 Pro Preview only: 45
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 5.5
Claude Opus 5.5 scores 88.8 against 32.3.
5 and 4 benchmarks behind the scores
Intelligence
AA Intelligence Index
Claude Opus 5.5
Claude Opus 5.5 leads, 57.6 against 29.7.
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
No call
Only Gemini 3.1 Pro Preview has a GPQA Diamond result, 95.5%.
Directional only
Math
AIME
No call
Only Gemini 3.1 Pro Preview has a AIME result, 98.1%.
Directional only
Knowledge
MMLU Pro
No call
Only Gemini 3.1 Pro Preview has a MMLU Pro result, 91.0%.
Directional only
Web design
Design Arena: websites
Claude Opus 5.5
Claude Opus 5.5 leads, 1335 against 1233.
Same board, both measured
General
Vals Index
No call
Only Claude Opus 5.5 has a Vals Index result, 70.2%.
Directional only
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
Gemini 3.1 Pro Preview
Claude Opus 5.5 $0.014, Gemini 3.1 Pro Preview $0.0080 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Gemini 3.1 Pro Preview has the number, $0.99.
Directional only

At a glance

Coding index: Claude Opus 5.5 88.8 from 5 benchmarks, Gemini 3.1 Pro Preview 32.3 from 4 benchmarks.
Widest category: Coding, 31.9 points apart on average over 17 shared benchmarks.
Widest single gap: Terminal-Bench 4 (Vals AI): Claude Opus 5.5 65.2% against Gemini 3.1 Pro Preview 2.5%, 83.5 points apart on a 0 to 100 scale.
Output price: Claude Opus 5.5 $20.00 against Gemini 3.1 Pro Preview $12.00 per million output tokens, 1.7x apart.
Context window: Claude Opus 5.5 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 Opus 5.5	Gemini 3.1 Pro Preview
Coding	17	0
Intelligence	1	0
Agentic work	12	0
Reasoning	12	1
Math	6	0
Knowledge	4	3
Web design	7	0
General	23	2
All shared boards	82	6

CodingLike-for-likeSix of these boards feed the Vibe Coding Index170

Coding benchmarks for Claude Opus 5.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 5.5	Gemini 3.1 Pro Preview	Leader
LiveBench coding	96.3%	Not measured	Only Claude Opus 5.5 measured
LMArena WebDev	1807	1447	Claude Opus 5.5
AA Coding Index	Not measured	68.8	Only Gemini 3.1 Pro Preview measured
LiveCodeBench (Vals AI)	Not measured	88.5%	Only Gemini 3.1 Pro Preview measured
SWE-bench Verified (Vals AI)	Not measured	78.8%	Only Gemini 3.1 Pro Preview measured
Terminal-Bench 4 (Vals AI)	65.2%	2.5%	Claude Opus 5.5
Vibe Code Bench (Vals AI)	90.3%	32.0%	Claude Opus 5.5
Code migration (Vals AI)	66.7%	17.3%	Claude Opus 5.5
ProgramBench (Vals AI)	18.5%	0.0%	Claude Opus 5.5
IOI (Vals AI)	95.1%	51.8%	Claude Opus 5.5
Terminal-Bench 2.1 (Vals AI)	87.6%	70.8%	Claude Opus 5.5
SWE-bench Multimodal (Vals AI)	70.2%	Not measured	Only Claude Opus 5.5 measured
Vibe Code Bench 1-100 (Vals AI)	30.4%	6.7%	Claude Opus 5.5
CyberBench (Vals AI)	74.6%	Not measured	Only Claude Opus 5.5 measured
SciCode	66.9%	58.7%	Claude Opus 5.5
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	54.6%	Not measured	Only Claude Opus 5.5 measured
FrontierSWE	62.3%	Not measured	Only Claude Opus 5.5 measured
GSO-Bench	Not measured	22.6%	Only Gemini 3.1 Pro Preview measured
WeirdML	Not measured	72.1%	Only Gemini 3.1 Pro Preview measured
MirrorCode	77.4%	8.9%	Claude Opus 5.5
ALE-Bench	2147.4	1160.6	Claude Opus 5.5
LMArena Text: coding	1545	1484	Claude Opus 5.5
LMArena Text: software and IT	1538	1487	Claude Opus 5.5
LMArena WebDev: React	1855	1438	Claude Opus 5.5
LMArena WebDev: HTML	1753	1490	Claude Opus 5.5
LMArena WebDev: from an image	1753	1481	Claude Opus 5.5
SciCode	18.5%	14.3%	Claude Opus 5.5
Neither model has a result on the other 10 boards here

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

Intelligence benchmarks for Claude Opus 5.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 5.5	Gemini 3.1 Pro Preview	Leader
AA Intelligence Index	57.6	29.7	Claude Opus 5.5
Epoch Capabilities Index	168.8	Not measured	Only Claude Opus 5.5 measured

Agentic workLike-for-likePublic boards, shown as published, kept out of the index120

Agentic work benchmarks for Claude Opus 5.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 5.5	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	1316	1125	Claude Opus 5.5
Design Arena: agents building full-stack apps	Not measured	1068	Only Gemini 3.1 Pro Preview measured
Design Arena: agents building mobile apps	1308	1094	Claude Opus 5.5
Design Arena: agents building Android apps	Not measured	1049	Only Gemini 3.1 Pro Preview measured
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
Design Arena: spreadsheets	1368	Not measured	Only Claude Opus 5.5 measured
LiveBench research	85.0%	Not measured	Only Claude Opus 5.5 measured
LiveBench browser	80.0%	Not measured	Only Claude Opus 5.5 measured
LiveBench long agentic	85.0%	Not measured	Only Claude Opus 5.5 measured
SREBench (Vals AI)	33.6%	0.0%	Claude Opus 5.5
Finance Agent (Vals AI)	58.6%	43.0%	Claude Opus 5.5
Tax Agent Bench (Vals AI)	45.6%	9.3%	Claude Opus 5.5
Legal Research Bench (Vals AI)	50.5%	20.7%	Claude Opus 5.5
Harvey's Legal Agent Benchmark (Vals AI)	9.2%	Not measured	Only Claude Opus 5.5 measured
Excel Modeling Benchmark (Vals AI)	75.9%	52.6%	Claude Opus 5.5
BioMysteryBench (Vals AI)	79.3%	60.0%	Claude Opus 5.5
Terminal-Bench-Science (Vals AI)	47.1%	1.4%	Claude Opus 5.5
Vals Science Index	58.7%	27.4%	Claude Opus 5.5
Time Horizon Index (Vals AI)	91.3%	Not measured	Only Claude Opus 5.5 measured
CUA-bench (Vals AI)	14.0%	Not measured	Only Claude Opus 5.5 measured
Robo-bench (Vals AI)	14.6%	Not measured	Only Claude Opus 5.5 measured
τ²-Bench Telecom	Not measured	95.6%	Only Gemini 3.1 Pro Preview measured
APEX-Agents	73.5%	35.1%	Claude Opus 5.5
METR time horizons	Not measured	77.0%	Only Gemini 3.1 Pro Preview measured
Remote Labor Index	21.3%	Not measured	Only Claude Opus 5.5 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
SpireClimb	3.3%	Not measured	Only Claude Opus 5.5 measured
Vending-Bench 2	$9,235	$911	Claude Opus 5.5
LMArena Search	1213	Not measured	Only Claude Opus 5.5 measured
Neither model has a result on the other 6 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index121

Reasoning benchmarks for Claude Opus 5.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 5.5	Gemini 3.1 Pro Preview	Leader
GPQA Diamond	Not measured	95.5%	Only Gemini 3.1 Pro Preview measured
LiveBench reasoning	92.2%	Not measured	Only Claude Opus 5.5 measured
MysteryMechanism (Vals AI)	49.5%	20.7%	Claude Opus 5.5
MMMU Pro (Vals AI)	Not measured	88.2%	Only Gemini 3.1 Pro Preview measured
GPQA Diamond (Artificial Analysis run)	Not measured	94.1%	Only Gemini 3.1 Pro Preview measured
Humanity's Last Exam (Artificial Analysis run)	61.4%	47.0%	Claude Opus 5.5
GPQA Diamond (Epoch AI run)	90.6%	94.4%	Gemini 3.1 Pro Preview
ARC-AGI	98.5%	98.0%	Claude Opus 5.5
ARC-AGI-2	93.3%	77.1%	Claude Opus 5.5
SimpleBench	Not measured	79.6%	Only Gemini 3.1 Pro Preview measured
Chess puzzles	67.0%	51.0%	Claude Opus 5.5
Mystery game puzzles	71.0%	34.0%	Claude Opus 5.5
EBR-bench	71.4%	14.3%	Claude Opus 5.5
LMArena Text: hard prompts	1536	1485	Claude Opus 5.5
LMArena Text: expert	1549	1483	Claude Opus 5.5
LMArena Text: hard prompts in English	1535	1480	Claude Opus 5.5
LMArena Vision: diagrams	1345	1311	Claude Opus 5.5
LMArena Vision: homework	1362	1316	Claude Opus 5.5
Neither model has a result on the other 4 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index60

Math benchmarks for Claude Opus 5.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 5.5	Gemini 3.1 Pro Preview	Leader
AIME	Not measured	98.1%	Only Gemini 3.1 Pro Preview measured
OTIS Mock AIME	100.0%	95.6%	Claude Opus 5.5
FrontierMath, tiers 1 to 3	91.2%	59.6%	Claude Opus 5.5
FrontierMath, tier 4	95.0%	26.8%	Claude Opus 5.5
ProofBench	100.0%	26.0%	Claude Opus 5.5
LMArena Text: math	1518	1486	Claude Opus 5.5
LMArena Text: mathematical work	1516	1478	Claude Opus 5.5
Neither model has a result on the other 6 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index43

Knowledge benchmarks for Claude Opus 5.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 5.5	Gemini 3.1 Pro Preview	Leader
MMLU Pro	Not measured	91.0%	Only Gemini 3.1 Pro Preview measured
LegalBench (Vals AI)	Not measured	87.4%	Only Gemini 3.1 Pro Preview measured
CaseLaw (Vals AI)	Not measured	64.8%	Only Gemini 3.1 Pro Preview measured
CorpFin (Vals AI)	Not measured	64.5%	Only Gemini 3.1 Pro Preview measured
TaxEval (Vals AI)	Not measured	72.9%	Only Gemini 3.1 Pro Preview measured
MortgageTax (Vals AI)	Not measured	69.4%	Only Gemini 3.1 Pro Preview measured
MedQA (Vals AI)	Not measured	96.4%	Only Gemini 3.1 Pro Preview measured
MedCode (Vals AI)	49.8%	59.1%	Gemini 3.1 Pro Preview
SimpleQA Verified	72.2%	73.5%	Gemini 3.1 Pro Preview
LMArena Text: science	1524	1497	Claude Opus 5.5
LMArena Text: medicine and healthcare	1509	1486	Claude Opus 5.5
LMArena Text: legal and government	1518	1487	Claude Opus 5.5
LMArena Text: business and finance	1494	1459	Claude Opus 5.5
FACTS Benchmark Suite	65.3%	67.4%	Gemini 3.1 Pro Preview
Neither model has a result on the other 4 boards here

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

Web design benchmarks for Claude Opus 5.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 5.5	Gemini 3.1 Pro Preview	Leader
Design Arena: websites	1335	1233	Claude Opus 5.5
Design Arena: UI components	1385	1224	Claude Opus 5.5
Design Arena: game dev	1461	1202	Claude Opus 5.5
Design Arena: data viz	1397	1209	Claude Opus 5.5
Design Arena: 3D	1476	1234	Claude Opus 5.5
Design Arena: all code categories	1390	1231	Claude Opus 5.5
Design Arena: SVG	1329	1285	Claude Opus 5.5
Design Arena: ASCII art	Not measured	1270	Only Gemini 3.1 Pro Preview measured
LiveBench design	86.9%	Not measured	Only Claude Opus 5.5 measured

GeneralLike-for-likePublic boards, shown as published, kept out of the index232

General benchmarks for Claude Opus 5.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 5.5	Gemini 3.1 Pro Preview	Leader
Vals Index	70.2%	Not measured	Only Claude Opus 5.5 measured
LiveBench data analysis	80.3%	Not measured	Only Claude Opus 5.5 measured
Public Benefits Bench (Vals AI)	70.6%	53.8%	Claude Opus 5.5
SAGE (Vals AI)	45.8%	48.7%	Gemini 3.1 Pro Preview
MedScribe (Vals AI)	91.4%	76.1%	Claude Opus 5.5
Vals Multimodal Index	Not measured	56.1%	Only Gemini 3.1 Pro Preview measured
IFBench	Not measured	77.1%	Only Gemini 3.1 Pro Preview measured
Long context reasoning (AA-LCR)	84.7%	82.0%	Claude Opus 5.5
DTBench	98.9%	97.1%	Claude Opus 5.5
LMCA	68.2%	53.8%	Claude Opus 5.5
CL-bench	Not measured	20.8%	Only Gemini 3.1 Pro Preview measured
Furniture assembly	83.3%	26.7%	Claude Opus 5.5
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	1516	1480	Claude Opus 5.5
LMArena Text: instruction following	1537	1466	Claude Opus 5.5
LMArena Text: creative writing	1535	1482	Claude Opus 5.5
LMArena Vision	1321	1296	Claude Opus 5.5
LMArena Text: English	1519	1478	Claude Opus 5.5
LMArena Text: non-English	1507	1476	Claude Opus 5.5
LMArena Text: Chinese	1582	1527	Claude Opus 5.5
LMArena Text: German	Not measured	1490	Only Gemini 3.1 Pro Preview measured
LMArena Text: Japanese	1534	1491	Claude Opus 5.5
LMArena Text: Korean	Not measured	1455	Only Gemini 3.1 Pro Preview measured
LMArena Text: French	1493	1487	Claude Opus 5.5
LMArena Text: Spanish	1508	1481	Claude Opus 5.5
LMArena Text: Russian	1517	1497	Claude Opus 5.5
LMArena Text: Polish	Not measured	1498	Only Gemini 3.1 Pro Preview measured
LMArena Text: multi-turn	1501	1487	Claude Opus 5.5
LMArena Text: longer queries	1532	1482	Claude Opus 5.5
LMArena Text: writing and language	1532	1481	Claude Opus 5.5
LMArena Text: entertainment and media	1515	1465	Claude Opus 5.5
LMArena Vision: English	1317	1287	Claude Opus 5.5
LMArena Vision: Chinese	Not measured	1364	Only Gemini 3.1 Pro Preview measured
LMArena Vision: reading text	1326	1304	Claude Opus 5.5
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	1320	1324	Gemini 3.1 Pro Preview
LMArena Document	Not measured	1444	Only Gemini 3.1 Pro Preview measured
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 Opus 5.5 and Gemini 3.1 Pro Preview
Benchmark	Claude Opus 5.5	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 5.5$0.014Fits 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 5.5$0.260Fits 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 5.5$1.00Fits in one request

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 5.5 and Gemini 3.1 Pro Preview
Specification	Anthropic Claude Opus 5.5	Google Gemini 3.1 Pro Preview
Maker	Anthropic	Google
Weights	No public weights listed	No public weights listed
Released	September 22, 2026	February 19, 2026
Context window	1M	1.05M
Input $/Mtok	$4.00	$2.00
Output $/Mtok	$20.00	$12.00
Coding index	88.8	32.3
Independent measurements behind it	5	4
Cost per solved task	Not computable	$0.99
Source	OpenRouter listing	OpenRouter listing

Questions

Is Claude Opus 5.5 better than Gemini 3.1 Pro Preview for coding?

Pick Claude Opus 5.5 for coding: it scores 88.8 on the Vibe Coding Index against 32.3 for Gemini 3.1 Pro Preview. Pick Gemini 3.1 Pro Preview for output tokens 1.7x cheaper ($12.00 vs $20.00 per million) and a larger context window (1.05M against 1M tokens).

Which is cheaper, Claude Opus 5.5 or Gemini 3.1 Pro Preview?

Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 per million output tokens; Gemini 3.1 Pro Preview costs $2.00 and $12.00. Cost per solved task is known for Gemini 3.1 Pro Preview only.

Which has the bigger context window, Claude Opus 5.5 or Gemini 3.1 Pro Preview?

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

How many benchmarks is the Claude Opus 5.5 vs Gemini 3.1 Pro Preview comparison based on?

88 benchmarks have a result for both models as of October 22, 2026. Claude Opus 5.5's coding index rests on 5 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.

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-opus-5-5-vs-gemini-3-1-pro-preview" title="Claude Opus 5.5 vs Gemini 3.1 Pro 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-opus-5-5-vs-gemini-3-1-pro-preview">LLMBenchmark.ai, Claude Opus 5.5 vs Gemini 3.1 Pro Preview</a></p>

Claude Opus 5.5 or Gemini 3.1 Pro Preview: which to pick

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Math

Knowledge

Web design

General

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