Claude Opus 5 vs Gemini 3.5 Flash Lite

Updated October 21, 2026. 83 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 5 Replace Gemini 3.5 Flash Lite

Claude Opus 5Anthropic

Coding: 81.8
Overall: 50.8
Output $/M: $25.00

Gemini 3.5 Flash LiteGoogle

Coding: 33.6
Overall: 22.2
Output $/M: $2.50

vs boards won of 83 shared

Decision reading

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 33.6 for Gemini 3.5 Flash Lite.

Pick Gemini 3.5 Flash Lite when output tokens cost 10.0x less, or when a solved task costs $0.41 against $1.33.

Model AClaude Opus 5Anthropic81.8/1002 independent benchmarks$1.33 per solved task Model BGemini 3.5 Flash LiteGoogle33.6/1001 independent benchmark$0.41 per solved task

8347

Shared results: 83
Claude Opus 5 only: 47
Gemini 3.5 Flash Lite only: 0
Like-for-like categories: 7 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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, four public coding benchmarks
Claude Opus 5
Claude Opus 5 scores 81.8 against 33.6.
2 and 1 benchmarks behind the scores
Intelligence
AA Intelligence Index
Claude Opus 5
Claude Opus 5 leads, 50.8 against 22.2.
Same board, both measured
Agentic work
AA Agentic Index
Claude Opus 5
Claude Opus 5 leads, 56.5 against 14.3.
Same board, both measured
Reasoning
GPQA Diamond
Claude Opus 5
Claude Opus 5 leads, 93.4% against 83.8%.
Same board, both measured
Knowledge
MMLU Pro
Claude Opus 5
Claude Opus 5 leads, 91.6% against 85.8%.
Same board, both measured
Web design
Design Arena: websites
No call
Only Claude Opus 5 has a Design Arena: websites result, 1309.
Directional only
Long documents
Listed context window
Gemini 3.5 Flash Lite
Gemini 3.5 Flash Lite takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 3.5 Flash Lite
Claude Opus 5 $0.018, Gemini 3.5 Flash Lite $0.0015 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
Gemini 3.5 Flash Lite
Claude Opus 5 $1.33, Gemini 3.5 Flash Lite $0.41.
Published attempt cost and pass rate

At a glance

Coding index: Claude Opus 5 81.8 from 2 benchmarks, Gemini 3.5 Flash Lite 33.6 from 1 benchmark.
Widest category: Math, 46.9 points apart on average over 6 shared benchmarks.
Widest single gap: ProofBench: Claude Opus 5 99.0% against Gemini 3.5 Flash Lite 13.0%, 86.0 points apart on a 0 to 100 scale.
Output price: Claude Opus 5 $25.00 against Gemini 3.5 Flash Lite $2.50 per million output tokens, 10.0x apart.
Context window: Claude Opus 5 takes 1M tokens, Gemini 3.5 Flash Lite 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	Bars	Gemini 3.5 Flash Lite	Ties
Coding	16		0
Intelligence	2		0
Agentic work	6		0
Reasoning	14		0
Math	6		0
Knowledge	10		0
General	29		0
All shared boards	83		0

CodingLike-for-likeFour of these boards feed the Vibe Coding Index160

Coding benchmarks for Claude Opus 5 and Gemini 3.5 Flash Lite
Benchmark	Claude Opus 5	Gemini 3.5 Flash Lite	Leader
LiveBench coding	90.8%	Not measured	Only Claude Opus 5 measured
LMArena WebDev	1689	1435	Claude Opus 5
AA Coding Index	78.0	49.3	Claude Opus 5
LiveCodeBench (Vals AI)	89.0%	79.0%	Claude Opus 5
SWE-bench Verified (Vals AI)	97.0%	75.0%	Claude Opus 5
Terminal-Bench 4 (Vals AI)	53.5%	Not measured	Only Claude Opus 5 measured
Vibe Code Bench (Vals AI)	88.4%	37.2%	Claude Opus 5
Code migration (Vals AI)	57.5%	6.2%	Claude Opus 5
ProgramBench (Vals AI)	3.0%	0.0%	Claude Opus 5
IOI (Vals AI)	84.3%	Not measured	Only Claude Opus 5 measured
Terminal-Bench 2.1 (Vals AI)	84.6%	50.2%	Claude Opus 5
Vibe Code Bench 1-100 (Vals AI)	28.5%	Not measured	Only Claude Opus 5 measured
SkillsBench (Vals AI)	60.4%	Not measured	Only Claude Opus 5 measured
CyberBench (Vals AI)	65.4%	59.1%	Claude Opus 5
SciCode	56.4%	41.3%	Claude Opus 5
FrontierCode	53.4%	Not measured	Only Claude Opus 5 measured
FrontierSWE	52.0%	Not measured	Only Claude Opus 5 measured
WeirdML	91.8%	39.0%	Claude Opus 5
ALE-Bench	2164.6	765.3	Claude Opus 5
LMArena Text: coding	1533	1453	Claude Opus 5
LMArena Text: software and IT	1527	1451	Claude Opus 5
LMArena WebDev: React	1711	1408	Claude Opus 5
LMArena WebDev: HTML	1680	Not measured	Only Claude Opus 5 measured
LMArena WebDev: from an image	1662	1448	Claude Opus 5
Neither model has a result on the other 14 boards here

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

Intelligence benchmarks for Claude Opus 5 and Gemini 3.5 Flash Lite
Benchmark	Claude Opus 5	Gemini 3.5 Flash Lite	Leader
AA Intelligence Index	50.8	22.2	Claude Opus 5
Epoch Capabilities Index	163.9	144.9	Claude Opus 5

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

Agentic work benchmarks for Claude Opus 5 and Gemini 3.5 Flash Lite
Benchmark	Claude Opus 5	Gemini 3.5 Flash Lite	Leader
AA Agentic Index	56.5	14.3	Claude Opus 5
Design Arena: agents building web apps	1266	Not measured	Only Claude Opus 5 measured
Design Arena: agents building full-stack apps	1306	Not measured	Only Claude Opus 5 measured
Design Arena: agents building mobile apps	1348	Not measured	Only Claude Opus 5 measured
Design Arena: agents building Android apps	1258	Not measured	Only Claude Opus 5 measured
Design Arena: agents building Godot games	1279	Not measured	Only Claude Opus 5 measured
Design Arena: agents building games	1261	Not measured	Only Claude Opus 5 measured
Design Arena: PowerPoint slides	1265	Not measured	Only Claude Opus 5 measured
LiveBench research	88.9%	Not measured	Only Claude Opus 5 measured
LiveBench browser	84.0%	Not measured	Only Claude Opus 5 measured
LiveBench long agentic	62.1%	Not measured	Only Claude Opus 5 measured
SREBench (Vals AI)	12.2%	Not measured	Only Claude Opus 5 measured
Finance Agent (Vals AI)	58.6%	47.4%	Claude Opus 5
Tax Agent Bench (Vals AI)	45.5%	7.2%	Claude Opus 5
Legal Research Bench (Vals AI)	55.3%	13.9%	Claude Opus 5
Excel Modeling Benchmark (Vals AI)	73.6%	43.2%	Claude Opus 5
BioMysteryBench (Vals AI)	79.3%	Not measured	Only Claude Opus 5 measured
Terminal-Bench-Science (Vals AI)	27.1%	Not measured	Only Claude Opus 5 measured
Vals Science Index	47.9%	Not measured	Only Claude Opus 5 measured
Time Horizon Index (Vals AI)	18.8%	Not measured	Only Claude Opus 5 measured
CUA-bench (Vals AI)	9.0%	Not measured	Only Claude Opus 5 measured
APEX-Agents	65.8%	29.3%	Claude Opus 5
OSWorld 2.0	31.4%	Not measured	Only Claude Opus 5 measured
BALROG	63.4%	Not measured	Only Claude Opus 5 measured
PostTrainBench	35.0%	Not measured	Only Claude Opus 5 measured
Vending-Bench 2	$11,182	Not measured	Only Claude Opus 5 measured
LMArena Search	1242	Not measured	Only Claude Opus 5 measured
Neither model has a result on the other 12 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index140

Reasoning benchmarks for Claude Opus 5 and Gemini 3.5 Flash Lite
Benchmark	Claude Opus 5	Gemini 3.5 Flash Lite	Leader
GPQA Diamond	93.4%	83.8%	Claude Opus 5
LiveBench reasoning	91.2%	Not measured	Only Claude Opus 5 measured
MysteryMechanism (Vals AI)	37.4%	Not measured	Only Claude Opus 5 measured
MMMU Pro (Vals AI)	89.9%	83.6%	Claude Opus 5
GPQA Diamond (Artificial Analysis run)	93.7%	83.8%	Claude Opus 5
Humanity's Last Exam (Artificial Analysis run)	54.9%	18.8%	Claude Opus 5
GPQA Diamond (Epoch AI run)	93.9%	83.3%	Claude Opus 5
ARC-AGI	97.5%	53.5%	Claude Opus 5
ARC-AGI-2	90.4%	10.3%	Claude Opus 5
SimpleBench	80.6%	Not measured	Only Claude Opus 5 measured
Chess puzzles	43.0%	21.0%	Claude Opus 5
Mystery game puzzles	59.0%	19.0%	Claude Opus 5
EBR-bench	45.7%	Not measured	Only Claude Opus 5 measured
LMArena Text: hard prompts	1527	1441	Claude Opus 5
LMArena Text: expert	1554	1434	Claude Opus 5
LMArena Text: hard prompts in English	1523	1440	Claude Opus 5
LMArena Vision: diagrams	1348	1284	Claude Opus 5
LMArena Vision: homework	1338	1291	Claude Opus 5
Neither model has a result on the other 3 boards here

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

Math benchmarks for Claude Opus 5 and Gemini 3.5 Flash Lite
Benchmark	Claude Opus 5	Gemini 3.5 Flash Lite	Leader
OTIS Mock AIME	98.9%	71.1%	Claude Opus 5
FrontierMath, tiers 1 to 3	85.6%	26.0%	Claude Opus 5
FrontierMath, tier 4	73.2%	0.0%	Claude Opus 5
ProofBench	99.0%	13.0%	Claude Opus 5
LMArena Text: math	1533	1434	Claude Opus 5
LMArena Text: mathematical work	1544	1433	Claude Opus 5
Neither model has a result on the other 7 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index100

Knowledge benchmarks for Claude Opus 5 and Gemini 3.5 Flash Lite
Benchmark	Claude Opus 5	Gemini 3.5 Flash Lite	Leader
MMLU Pro	91.6%	85.8%	Claude Opus 5
LegalBench (Vals AI)	87.0%	84.1%	Claude Opus 5
CorpFin (Vals AI)	73.2%	60.7%	Claude Opus 5
TaxEval (Vals AI)	75.1%	72.6%	Claude Opus 5
MortgageTax (Vals AI)	72.1%	68.7%	Claude Opus 5
MedCode (Vals AI)	63.6%	43.5%	Claude Opus 5
SimpleQA Verified	59.9%	Not measured	Only Claude Opus 5 measured
LMArena Text: science	1531	1451	Claude Opus 5
LMArena Text: medicine and healthcare	1525	1438	Claude Opus 5
LMArena Text: legal and government	1530	1431	Claude Opus 5
LMArena Text: business and finance	1501	1423	Claude Opus 5
Neither model has a result on the other 6 boards here

Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared

Web design benchmarks for Claude Opus 5 and Gemini 3.5 Flash Lite
Benchmark	Claude Opus 5	Gemini 3.5 Flash Lite	Leader
Design Arena: websites	1309	Not measured	Only Claude Opus 5 measured
Design Arena: UI components	1348	Not measured	Only Claude Opus 5 measured
Design Arena: game dev	1339	Not measured	Only Claude Opus 5 measured
Design Arena: data viz	1329	Not measured	Only Claude Opus 5 measured
Design Arena: 3D	1335	Not measured	Only Claude Opus 5 measured
Design Arena: all code categories	1324	Not measured	Only Claude Opus 5 measured
Design Arena: SVG	1310	Not measured	Only Claude Opus 5 measured
Design Arena: ASCII art	1352	Not measured	Only Claude Opus 5 measured
LiveBench design	83.0%	Not measured	Only Claude Opus 5 measured

GeneralLike-for-likePublic boards, shown as published, kept out of the index290

General benchmarks for Claude Opus 5 and Gemini 3.5 Flash Lite
Benchmark	Claude Opus 5	Gemini 3.5 Flash Lite	Leader
LiveBench data analysis	74.6%	Not measured	Only Claude Opus 5 measured
Public Benefits Bench (Vals AI)	76.9%	51.8%	Claude Opus 5
SAGE (Vals AI)	49.4%	47.3%	Claude Opus 5
MedScribe (Vals AI)	91.0%	70.9%	Claude Opus 5
Vals Multimodal Index	73.9%	Not measured	Only Claude Opus 5 measured
Long context reasoning (AA-LCR)	82.0%	76.0%	Claude Opus 5
DTBench	97.9%	83.5%	Claude Opus 5
LMCA	64.5%	37.6%	Claude Opus 5
Furniture assembly	60.8%	Not measured	Only Claude Opus 5 measured
LMArena Text	1509	1435	Claude Opus 5
LMArena Text: instruction following	1518	1419	Claude Opus 5
LMArena Text: creative writing	1493	1421	Claude Opus 5
LMArena Vision	1320	1269	Claude Opus 5
LMArena Text: English	1508	1438	Claude Opus 5
LMArena Text: non-English	1502	1427	Claude Opus 5
LMArena Text: Chinese	1573	1468	Claude Opus 5
LMArena Text: German	1527	1454	Claude Opus 5
LMArena Text: Japanese	1520	1426	Claude Opus 5
LMArena Text: Korean	1517	1407	Claude Opus 5
LMArena Text: French	1519	1451	Claude Opus 5
LMArena Text: Spanish	1523	1441	Claude Opus 5
LMArena Text: Russian	1507	1443	Claude Opus 5
LMArena Text: Polish	1522	1437	Claude Opus 5
LMArena Text: multi-turn	1500	1445	Claude Opus 5
LMArena Text: longer queries	1517	1435	Claude Opus 5
LMArena Text: writing and language	1499	1428	Claude Opus 5
LMArena Text: entertainment and media	1481	1414	Claude Opus 5
LMArena Vision: English	1315	1269	Claude Opus 5
LMArena Vision: Chinese	1400	1311	Claude Opus 5
LMArena Vision: reading text	1329	1280	Claude Opus 5
LMArena Vision: humor	1293	1287	Claude Opus 5
LMArena Vision: creative writing	1313	1260	Claude Opus 5
LMArena Document	1516	Not measured	Only Claude Opus 5 measured
Neither model has a result on the other 13 boards here

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

Image generation benchmarks for Claude Opus 5 and Gemini 3.5 Flash Lite
Benchmark	Claude Opus 5	Gemini 3.5 Flash Lite	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$0.018Fits in one request

Gemini 3.5 Flash Lite$0.0015Fits in one request

Gemini 3.5 Flash Lite costs less

Repository review

50K input + 3K output tokens

Claude Opus 5$0.325Fits in one request

Gemini 3.5 Flash Lite$0.022Fits in one request

Gemini 3.5 Flash Lite costs less

Agent loop

200K input + 10K output tokens

Claude Opus 5$1.25Fits in one request

Gemini 3.5 Flash Lite$0.085Fits in one request

Gemini 3.5 Flash Lite 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 and Gemini 3.5 Flash Lite
Specification	Anthropic Claude Opus 5	Google Gemini 3.5 Flash Lite
Maker	Anthropic	Google
Weights	No public weights listed	No public weights listed
Released	July 24, 2026	July 21, 2026
Context window	1M	1.05M
Input $/Mtok	$5.00	$0.30
Output $/Mtok	$25.00	$2.50
Coding index	81.8	33.6
Independent measurements behind it	2	1
Cost per solved task	$1.33	$0.41
Source	OpenRouter listing	OpenRouter listing

Questions

Is Claude Opus 5 better than Gemini 3.5 Flash Lite for coding?

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 33.6 for Gemini 3.5 Flash Lite. Pick Gemini 3.5 Flash Lite when output tokens cost 10.0x less, or when a solved task costs $0.41 against $1.33.

Which is cheaper, Claude Opus 5 or Gemini 3.5 Flash Lite?

Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; Gemini 3.5 Flash Lite costs $0.30 and $2.50. Per solved SWE-bench Verified task, Claude Opus 5 costs $1.33 and Gemini 3.5 Flash Lite $0.41.

Which has the bigger context window, Claude Opus 5 or Gemini 3.5 Flash Lite?

Gemini 3.5 Flash Lite, with 1.05M tokens against 1M.

How many benchmarks is the Claude Opus 5 vs Gemini 3.5 Flash Lite comparison based on?

83 benchmarks have a result for both models as of October 21, 2026. Claude Opus 5's coding index rests on 2 independent benchmarks and Gemini 3.5 Flash Lite's on 1. Where only one model has a result, the page says so instead of naming a winner.

Decision reading

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

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

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