Claude Opus 5.5 vs Gemini 3.1 Flash Lite Preview

Claude Opus 5.5 leads Gemini 3.1 Flash Lite Preview on coding, 88.8 to 22.7 on the Vibe Coding Index, and Gemini 3.1 Flash Lite Preview costs 13.3x less per output token ($1.50 vs $20.00 per million). Updated October 22, 2026; 57 benchmarks have a result for both.

Replace Claude Opus 5.5 Replace Gemini 3.1 Flash Lite Preview

Claude Opus 5.5Anthropic

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

Gemini 3.1 Flash Lite PreviewGoogle

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

vs boards won of 57 shared

Claude Opus 5.5 or Gemini 3.1 Flash Lite Preview: which to pick

Pick Claude Opus 5.5 for coding: it scores 88.8 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 13.3x cheaper ($1.50 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 Flash Lite PreviewGoogle22.7/1003 independent benchmarks$0.18 per solved task

575222

Shared results: 57
Claude Opus 5.5 only: 52
Gemini 3.1 Flash Lite Preview only: 22
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 22.7.
5 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
Claude Opus 5.5
Claude Opus 5.5 leads, 57.6 against 15.6.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Gemini 3.1 Flash Lite Preview has a AA Agentic Index result, 1.6.
Directional only
Reasoning
GPQA Diamond
No call
Only Gemini 3.1 Flash Lite Preview has a GPQA Diamond result, 81.1%.
Directional only
Math
AIME
No call
Only Gemini 3.1 Flash Lite Preview has a AIME result, 83.3%.
Directional only
Knowledge
MMLU Pro
No call
Only Gemini 3.1 Flash Lite Preview has a MMLU Pro result, 86.2%.
Directional only
Web design
Design Arena: websites
Claude Opus 5.5
Claude Opus 5.5 leads, 1335 against 1082.
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 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 Opus 5.5 $0.014, Gemini 3.1 Flash Lite Preview $0.0010 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Gemini 3.1 Flash Lite Preview has the number, $0.18.
Directional only

At a glance

Coding index: Claude Opus 5.5 88.8 from 5 benchmarks, Gemini 3.1 Flash Lite Preview 22.7 from 3 benchmarks.
Widest category: Coding, 47.0 points apart on average over 12 shared benchmarks.
Widest single gap: Vibe Code Bench (Vals AI): Claude Opus 5.5 90.3% against Gemini 3.1 Flash Lite Preview 0.0%, 90.3 points apart on a 0 to 100 scale.
Output price: Claude Opus 5.5 $20.00 against Gemini 3.1 Flash Lite Preview $1.50 per million output tokens, 13.3x apart.
Context window: Claude Opus 5.5 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 Opus 5.5	Gemini 3.1 Flash Lite Preview
Coding	12	0
Intelligence	1	0
Agentic work	4	0
Reasoning	5	0
Math	2	0
Knowledge	6	0
Web design	7	0
General	19	1
All shared boards	56	1

CodingLike-for-likeSix of these boards feed the Vibe Coding Index120

Coding benchmarks for Claude Opus 5.5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Opus 5.5	Gemini 3.1 Flash Lite Preview	Leader
LiveBench coding	96.3%	Not measured	Only Claude Opus 5.5 measured
LMArena WebDev	1807	1257	Claude Opus 5.5
AA Coding Index	Not measured	34.7	Only Gemini 3.1 Flash Lite Preview measured
LiveCodeBench (Vals AI)	Not measured	80.1%	Only Gemini 3.1 Flash Lite Preview measured
SWE-bench Verified (Vals AI)	Not measured	62.8%	Only Gemini 3.1 Flash Lite Preview measured
Terminal-Bench 4 (Vals AI)	65.2%	Not measured	Only Claude Opus 5.5 measured
Vibe Code Bench (Vals AI)	90.3%	0.0%	Claude Opus 5.5
Code migration (Vals AI)	66.7%	4.6%	Claude Opus 5.5
ProgramBench (Vals AI)	18.5%	0.0%	Claude Opus 5.5
IOI (Vals AI)	95.1%	Not measured	Only Claude Opus 5.5 measured
Terminal-Bench 2.1 (Vals AI)	87.6%	34.1%	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%	Not measured	Only Claude Opus 5.5 measured
CyberBench (Vals AI)	74.6%	Not measured	Only Claude Opus 5.5 measured
SciCode	66.9%	Not measured	Only Claude Opus 5.5 measured
FrontierCode	54.6%	Not measured	Only Claude Opus 5.5 measured
FrontierSWE	62.3%	Not measured	Only Claude Opus 5.5 measured
MirrorCode	77.4%	Not measured	Only Claude Opus 5.5 measured
ALE-Bench	2147.4	797.7	Claude Opus 5.5
LMArena Text: coding	1545	1400	Claude Opus 5.5
LMArena Text: software and IT	1538	1413	Claude Opus 5.5
LMArena WebDev: React	1855	1245	Claude Opus 5.5
LMArena WebDev: HTML	1753	1276	Claude Opus 5.5
LMArena WebDev: from an image	1753	1336	Claude Opus 5.5
SciCode	18.5%	4.6%	Claude Opus 5.5
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 Opus 5.5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Opus 5.5	Gemini 3.1 Flash Lite Preview	Leader
AA Intelligence Index	57.6	15.6	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 index40

Agentic work benchmarks for Claude Opus 5.5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Opus 5.5	Gemini 3.1 Flash Lite Preview	Leader
AA Agentic Index	Not measured	1.6	Only Gemini 3.1 Flash Lite Preview measured
Design Arena: agents building web apps	1316	Not measured	Only Claude Opus 5.5 measured
Design Arena: agents building mobile apps	1308	Not measured	Only Claude Opus 5.5 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%	Not measured	Only Claude Opus 5.5 measured
Finance Agent (Vals AI)	58.6%	30.0%	Claude Opus 5.5
Tax Agent Bench (Vals AI)	45.6%	3.1%	Claude Opus 5.5
Legal Research Bench (Vals AI)	50.5%	3.4%	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%	8.6%	Claude Opus 5.5
BioMysteryBench (Vals AI)	79.3%	Not measured	Only Claude Opus 5.5 measured
Terminal-Bench-Science (Vals AI)	47.1%	Not measured	Only Claude Opus 5.5 measured
Vals Science Index	58.7%	Not measured	Only Claude Opus 5.5 measured
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
APEX-Agents	73.5%	Not measured	Only Claude Opus 5.5 measured
Remote Labor Index	21.3%	Not measured	Only Claude Opus 5.5 measured
SpireClimb	3.3%	Not measured	Only Claude Opus 5.5 measured
Vending-Bench 2	$9,235	Not measured	Only Claude Opus 5.5 measured
LMArena Search	1213	Not measured	Only Claude Opus 5.5 measured
Neither model has a result on the other 17 boards here

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

Reasoning benchmarks for Claude Opus 5.5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Opus 5.5	Gemini 3.1 Flash Lite Preview	Leader
GPQA Diamond	Not measured	81.1%	Only Gemini 3.1 Flash Lite Preview measured
LiveBench reasoning	92.2%	Not measured	Only Claude Opus 5.5 measured
MysteryMechanism (Vals AI)	49.5%	Not measured	Only Claude Opus 5.5 measured
MMMU Pro (Vals AI)	Not measured	82.5%	Only Gemini 3.1 Flash Lite Preview measured
Humanity's Last Exam (Artificial Analysis run)	61.4%	Not measured	Only Claude Opus 5.5 measured
GPQA Diamond (Epoch AI run)	90.6%	Not measured	Only Claude Opus 5.5 measured
ARC-AGI	98.5%	Not measured	Only Claude Opus 5.5 measured
ARC-AGI-2	93.3%	Not measured	Only Claude Opus 5.5 measured
Chess puzzles	67.0%	Not measured	Only Claude Opus 5.5 measured
Mystery game puzzles	71.0%	Not measured	Only Claude Opus 5.5 measured
EBR-bench	71.4%	Not measured	Only Claude Opus 5.5 measured
LMArena Text: hard prompts	1536	1407	Claude Opus 5.5
LMArena Text: expert	1549	1398	Claude Opus 5.5
LMArena Text: hard prompts in English	1535	1403	Claude Opus 5.5
LMArena Vision: diagrams	1345	1242	Claude Opus 5.5
LMArena Vision: homework	1362	1271	Claude Opus 5.5
Neither model has a result on the other 6 boards here

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

Math benchmarks for Claude Opus 5.5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Opus 5.5	Gemini 3.1 Flash Lite Preview	Leader
AIME	Not measured	83.3%	Only Gemini 3.1 Flash Lite Preview measured
OTIS Mock AIME	100.0%	Not measured	Only Claude Opus 5.5 measured
FrontierMath, tiers 1 to 3	91.2%	Not measured	Only Claude Opus 5.5 measured
FrontierMath, tier 4	95.0%	Not measured	Only Claude Opus 5.5 measured
ProofBench	100.0%	Not measured	Only Claude Opus 5.5 measured
LMArena Text: math	1518	1428	Claude Opus 5.5
LMArena Text: mathematical work	1516	1417	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 index60

Knowledge benchmarks for Claude Opus 5.5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Opus 5.5	Gemini 3.1 Flash Lite Preview	Leader
MMLU Pro	Not measured	86.2%	Only Gemini 3.1 Flash Lite Preview measured
LegalBench (Vals AI)	Not measured	83.8%	Only Gemini 3.1 Flash Lite Preview measured
CaseLaw (Vals AI)	Not measured	55.0%	Only Gemini 3.1 Flash Lite Preview measured
CorpFin (Vals AI)	Not measured	59.4%	Only Gemini 3.1 Flash Lite Preview measured
TaxEval (Vals AI)	Not measured	71.8%	Only Gemini 3.1 Flash Lite Preview measured
MortgageTax (Vals AI)	Not measured	68.0%	Only Gemini 3.1 Flash Lite Preview measured
MedCode (Vals AI)	49.8%	47.6%	Claude Opus 5.5
SimpleQA Verified	72.2%	Not measured	Only Claude Opus 5.5 measured
LMArena Text: science	1524	1425	Claude Opus 5.5
LMArena Text: medicine and healthcare	1509	1428	Claude Opus 5.5
LMArena Text: legal and government	1518	1418	Claude Opus 5.5
LMArena Text: business and finance	1494	1389	Claude Opus 5.5
FACTS Benchmark Suite	65.3%	51.4%	Claude Opus 5.5
Neither model has a result on the other 5 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 Flash Lite Preview
Benchmark	Claude Opus 5.5	Gemini 3.1 Flash Lite Preview	Leader
Design Arena: websites	1335	1082	Claude Opus 5.5
Design Arena: UI components	1385	1069	Claude Opus 5.5
Design Arena: game dev	1461	1029	Claude Opus 5.5
Design Arena: data viz	1397	1045	Claude Opus 5.5
Design Arena: 3D	1476	1047	Claude Opus 5.5
Design Arena: all code categories	1390	1072	Claude Opus 5.5
Design Arena: SVG	1329	1052	Claude Opus 5.5
Design Arena: ASCII art	Not measured	1167	Only Gemini 3.1 Flash Lite 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 index191

General benchmarks for Claude Opus 5.5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Opus 5.5	Gemini 3.1 Flash Lite 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%	Not measured	Only Claude Opus 5.5 measured
SAGE (Vals AI)	45.8%	49.5%	Gemini 3.1 Flash Lite Preview
MedScribe (Vals AI)	91.4%	63.9%	Claude Opus 5.5
Vals Multimodal Index	Not measured	41.4%	Only Gemini 3.1 Flash Lite Preview measured
Long context reasoning (AA-LCR)	84.7%	Not measured	Only Claude Opus 5.5 measured
DTBench	98.9%	Not measured	Only Claude Opus 5.5 measured
LMCA	68.2%	Not measured	Only Claude Opus 5.5 measured
Furniture assembly	83.3%	Not measured	Only Claude Opus 5.5 measured
LMArena Text	1516	1416	Claude Opus 5.5
LMArena Text: instruction following	1537	1377	Claude Opus 5.5
LMArena Text: creative writing	1535	1401	Claude Opus 5.5
LMArena Vision	1321	1240	Claude Opus 5.5
LMArena Text: English	1519	1414	Claude Opus 5.5
LMArena Text: non-English	1507	1410	Claude Opus 5.5
LMArena Text: Chinese	1582	1460	Claude Opus 5.5
LMArena Text: German	Not measured	1430	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: Japanese	1534	1413	Claude Opus 5.5
LMArena Text: Korean	Not measured	1392	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: French	1493	1424	Claude Opus 5.5
LMArena Text: Spanish	1508	1421	Claude Opus 5.5
LMArena Text: Russian	1517	1420	Claude Opus 5.5
LMArena Text: Polish	Not measured	1443	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: multi-turn	1501	1417	Claude Opus 5.5
LMArena Text: longer queries	1532	1394	Claude Opus 5.5
LMArena Text: writing and language	1532	1408	Claude Opus 5.5
LMArena Text: entertainment and media	1515	1386	Claude Opus 5.5
LMArena Vision: English	1317	1232	Claude Opus 5.5
LMArena Vision: Chinese	Not measured	1278	Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: reading text	1326	1246	Claude Opus 5.5
LMArena Vision: humor	Not measured	1266	Only Gemini 3.1 Flash Lite Preview measured
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	1320	1248	Claude Opus 5.5
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 Opus 5.5 and Gemini 3.1 Flash Lite Preview
Benchmark	Claude Opus 5.5	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 Opus 5.5$0.014Fits 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 Opus 5.5$0.260Fits 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 Opus 5.5$1.00Fits 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 Opus 5.5 and Gemini 3.1 Flash Lite Preview
Specification	Anthropic Claude Opus 5.5	Google Gemini 3.1 Flash Lite Preview
Maker	Anthropic	Google
Weights	No public weights listed	No public weights listed
Released	September 22, 2026	March 3, 2026
Context window	1M	1.05M
Input $/Mtok	$4.00	$0.25
Output $/Mtok	$20.00	$1.50
Coding index	88.8	22.7
Independent measurements behind it	5	3
Cost per solved task	Not computable	$0.18
Source	OpenRouter listing	OpenRouter listing

Questions

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

Pick Claude Opus 5.5 for coding: it scores 88.8 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 13.3x cheaper ($1.50 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 Flash Lite Preview?

Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 per million output tokens; Gemini 3.1 Flash Lite Preview costs $0.25 and $1.50. Cost per solved task is known for Gemini 3.1 Flash Lite Preview only.

Which has the bigger context window, Claude Opus 5.5 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 Opus 5.5 vs Gemini 3.1 Flash Lite Preview comparison based on?

57 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 Flash Lite Preview's on 3. Where only one model has a result, the page says so instead of naming a winner.

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Claude Opus 5.5 or Gemini 3.1 Flash Lite Preview: which to pick

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Math

Knowledge

Web design

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