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Claude Opus 5 vs Gemini 3.1 Flash Lite Preview

Claude Opus 5 leads Gemini 3.1 Flash Lite Preview on coding, 83.0 to 22.7 on the Vibe Coding Index, and Gemini 3.1 Flash Lite Preview costs 16.7x less per output token ($1.50 vs $25.00 per million). Updated October 22, 2026; 74 benchmarks have a result for both.

Replace Claude Opus 5 Replace Gemini 3.1 Flash Lite Preview
Claude Opus 5Anthropic
Coding
83.0
Overall
81.6
Output $/M
$25.00
73
Gemini 3.1 Flash Lite PreviewGoogle
Coding
22.7
Overall
36.6
Output $/M
$1.50
1
vs boards won of 74 shared

Claude Opus 5 or Gemini 3.1 Flash Lite Preview: which to pick

Pick Claude Opus 5 for coding: it scores 83.0 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 16.7x cheaper ($1.50 vs $25.00 per million) and a lower cost per solved task ($0.18 against $1.33).

Model AClaude Opus 5Anthropic83.0/1006 independent benchmarks$1.33 per solved taskModel BGemini 3.1 Flash Lite PreviewGoogle22.7/1003 independent benchmarks$0.18 per solved task
Shared results
74
Claude Opus 5 only
57
Gemini 3.1 Flash Lite Preview only
5
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.

At a glance

Coding index
Claude Opus 5 83.0 from 6 benchmarks, Gemini 3.1 Flash Lite Preview 22.7 from 3 benchmarks.
Widest category
Agentic work, 48.6 points apart on average over 5 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Claude Opus 5 88.4% against Gemini 3.1 Flash Lite Preview 0.0%, 88.4 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against Gemini 3.1 Flash Lite Preview $1.50 per million output tokens, 16.7x apart.
Context window
Claude Opus 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
CategoryClaude Opus 5BarsGemini 3.1 Flash Lite PreviewTies
Coding150
Intelligence10
Agentic work50
Reasoning70
Math20
Knowledge100
Web design80
General251
All shared boards731
CodingLike-for-likeSix of these boards feed the Vibe Coding Index150
Coding benchmarks for Claude Opus 5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Opus 5Gemini 3.1 Flash Lite PreviewLeader
LiveBench coding90.8%Not measuredOnly Claude Opus 5 measured
LMArena WebDev16891257Claude Opus 5
AA Coding Index78.034.7Claude Opus 5
LiveCodeBench (Vals AI)89.0%80.1%Claude Opus 5
SWE-bench Verified (Vals AI)97.0%62.8%Claude Opus 5
Terminal-Bench 4 (Vals AI)53.5%Not measuredOnly Claude Opus 5 measured
Vibe Code Bench (Vals AI)88.4%0.0%Claude Opus 5
Code migration (Vals AI)57.5%4.6%Claude Opus 5
ProgramBench (Vals AI)3.0%0.0%Claude Opus 5
IOI (Vals AI)84.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench 2.1 (Vals AI)84.6%34.1%Claude Opus 5
Vibe Code Bench 1-100 (Vals AI)28.5%Not measuredOnly Claude Opus 5 measured
SkillsBench (Vals AI)60.4%Not measuredOnly Claude Opus 5 measured
CyberBench (Vals AI)65.4%Not measuredOnly Claude Opus 5 measured
SciCode56.4%Not measuredOnly Claude Opus 5 measured
FrontierCode53.4%Not measuredOnly Claude Opus 5 measured
FrontierSWE52.0%Not measuredOnly Claude Opus 5 measured
WeirdML91.8%Not measuredOnly Claude Opus 5 measured
ALE-Bench2164.6797.7Claude Opus 5
LMArena Text: coding15331400Claude Opus 5
LMArena Text: software and IT15271413Claude Opus 5
LMArena WebDev: React17111245Claude Opus 5
LMArena WebDev: HTML16801276Claude Opus 5
LMArena WebDev: from an image16621336Claude Opus 5
SciCode13.8%4.6%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 index10
Intelligence benchmarks for Claude Opus 5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Opus 5Gemini 3.1 Flash Lite PreviewLeader
AA Intelligence Index50.815.6Claude Opus 5
Epoch Capabilities Index163.9Not measuredOnly Claude Opus 5 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index50
Agentic work benchmarks for Claude Opus 5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Opus 5Gemini 3.1 Flash Lite PreviewLeader
AA Agentic Index56.51.6Claude Opus 5
Design Arena: agents building web apps1266Not measuredOnly Claude Opus 5 measured
Design Arena: agents building full-stack apps1306Not measuredOnly Claude Opus 5 measured
Design Arena: agents building mobile apps1348Not measuredOnly Claude Opus 5 measured
Design Arena: agents building Android apps1257Not measuredOnly Claude Opus 5 measured
Design Arena: agents building Godot games1279Not measuredOnly Claude Opus 5 measured
Design Arena: agents building games1261Not measuredOnly Claude Opus 5 measured
Design Arena: PowerPoint slides1240Not measuredOnly Claude Opus 5 measured
LiveBench research88.9%Not measuredOnly Claude Opus 5 measured
LiveBench browser84.0%Not measuredOnly Claude Opus 5 measured
LiveBench long agentic62.1%Not measuredOnly Claude Opus 5 measured
SREBench (Vals AI)12.2%Not measuredOnly Claude Opus 5 measured
Finance Agent (Vals AI)58.6%30.0%Claude Opus 5
Tax Agent Bench (Vals AI)45.5%3.1%Claude Opus 5
Legal Research Bench (Vals AI)55.3%3.4%Claude Opus 5
Excel Modeling Benchmark (Vals AI)73.6%8.6%Claude Opus 5
BioMysteryBench (Vals AI)79.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench-Science (Vals AI)27.1%Not measuredOnly Claude Opus 5 measured
Vals Science Index47.9%Not measuredOnly Claude Opus 5 measured
Time Horizon Index (Vals AI)18.8%Not measuredOnly Claude Opus 5 measured
CUA-bench (Vals AI)9.0%Not measuredOnly Claude Opus 5 measured
APEX-Agents65.8%Not measuredOnly Claude Opus 5 measured
OSWorld 2.031.4%Not measuredOnly Claude Opus 5 measured
BALROG63.4%Not measuredOnly Claude Opus 5 measured
PostTrainBench35.0%Not measuredOnly Claude Opus 5 measured
Vending-Bench 2$11,182Not measuredOnly Claude Opus 5 measured
LMArena Search1242Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 14 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index70
Reasoning benchmarks for Claude Opus 5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Opus 5Gemini 3.1 Flash Lite PreviewLeader
GPQA Diamond93.4%81.1%Claude Opus 5
LiveBench reasoning91.2%Not measuredOnly Claude Opus 5 measured
MysteryMechanism (Vals AI)37.4%Not measuredOnly Claude Opus 5 measured
MMMU Pro (Vals AI)89.9%82.5%Claude Opus 5
GPQA Diamond (Artificial Analysis run)93.7%Not measuredOnly Claude Opus 5 measured
Humanity's Last Exam (Artificial Analysis run)54.9%Not measuredOnly Claude Opus 5 measured
GPQA Diamond (Epoch AI run)93.9%Not measuredOnly Claude Opus 5 measured
ARC-AGI97.5%Not measuredOnly Claude Opus 5 measured
ARC-AGI-290.4%Not measuredOnly Claude Opus 5 measured
SimpleBench80.6%Not measuredOnly Claude Opus 5 measured
Chess puzzles43.0%Not measuredOnly Claude Opus 5 measured
Mystery game puzzles59.0%Not measuredOnly Claude Opus 5 measured
EBR-bench45.7%Not measuredOnly Claude Opus 5 measured
LMArena Text: hard prompts15271407Claude Opus 5
LMArena Text: expert15541398Claude Opus 5
LMArena Text: hard prompts in English15231403Claude Opus 5
LMArena Vision: diagrams13481242Claude Opus 5
LMArena Vision: homework13381271Claude Opus 5
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for Claude Opus 5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Opus 5Gemini 3.1 Flash Lite PreviewLeader
AIMENot measured83.3%Only Gemini 3.1 Flash Lite Preview measured
OTIS Mock AIME98.9%Not measuredOnly Claude Opus 5 measured
FrontierMath, tiers 1 to 385.6%Not measuredOnly Claude Opus 5 measured
FrontierMath, tier 473.2%Not measuredOnly Claude Opus 5 measured
ProofBench99.0%Not measuredOnly Claude Opus 5 measured
LMArena Text: math15331428Claude Opus 5
LMArena Text: mathematical work15441417Claude Opus 5
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index100
Knowledge benchmarks for Claude Opus 5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Opus 5Gemini 3.1 Flash Lite PreviewLeader
MMLU Pro91.6%86.2%Claude Opus 5
LegalBench (Vals AI)87.0%83.8%Claude Opus 5
CaseLaw (Vals AI)Not measured55.0%Only Gemini 3.1 Flash Lite Preview measured
CorpFin (Vals AI)73.2%59.4%Claude Opus 5
TaxEval (Vals AI)75.1%71.8%Claude Opus 5
MortgageTax (Vals AI)72.1%68.0%Claude Opus 5
MedCode (Vals AI)63.6%47.6%Claude Opus 5
SimpleQA Verified59.9%Not measuredOnly Claude Opus 5 measured
LMArena Text: science15311425Claude Opus 5
LMArena Text: medicine and healthcare15251428Claude Opus 5
LMArena Text: legal and government15301418Claude Opus 5
LMArena Text: business and finance15011389Claude Opus 5
FACTS Benchmark SuiteNot measured51.4%Only Gemini 3.1 Flash Lite Preview measured
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Opus 5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Opus 5Gemini 3.1 Flash Lite PreviewLeader
Design Arena: websites13091082Claude Opus 5
Design Arena: UI components13461069Claude Opus 5
Design Arena: game dev13371029Claude Opus 5
Design Arena: data viz13291045Claude Opus 5
Design Arena: 3D13341047Claude Opus 5
Design Arena: all code categories13231072Claude Opus 5
Design Arena: SVG13111052Claude Opus 5
Design Arena: ASCII art13521167Claude Opus 5
LiveBench design83.0%Not measuredOnly Claude Opus 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index251
General benchmarks for Claude Opus 5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Opus 5Gemini 3.1 Flash Lite PreviewLeader
LiveBench data analysis74.6%Not measuredOnly Claude Opus 5 measured
Public Benefits Bench (Vals AI)76.9%Not measuredOnly Claude Opus 5 measured
SAGE (Vals AI)49.4%49.5%Gemini 3.1 Flash Lite Preview
MedScribe (Vals AI)91.0%63.9%Claude Opus 5
Vals Multimodal Index73.9%41.4%Claude Opus 5
Long context reasoning (AA-LCR)82.0%Not measuredOnly Claude Opus 5 measured
DTBench97.9%Not measuredOnly Claude Opus 5 measured
LMCA64.5%Not measuredOnly Claude Opus 5 measured
Furniture assembly60.8%Not measuredOnly Claude Opus 5 measured
LMArena Text15091416Claude Opus 5
LMArena Text: instruction following15181377Claude Opus 5
LMArena Text: creative writing14931401Claude Opus 5
LMArena Vision13201240Claude Opus 5
LMArena Text: English15081414Claude Opus 5
LMArena Text: non-English15021410Claude Opus 5
LMArena Text: Chinese15731460Claude Opus 5
LMArena Text: German15271430Claude Opus 5
LMArena Text: Japanese15201413Claude Opus 5
LMArena Text: Korean15171392Claude Opus 5
LMArena Text: French15191424Claude Opus 5
LMArena Text: Spanish15231421Claude Opus 5
LMArena Text: Russian15071420Claude Opus 5
LMArena Text: Polish15221443Claude Opus 5
LMArena Text: multi-turn15001417Claude Opus 5
LMArena Text: longer queries15171394Claude Opus 5
LMArena Text: writing and language14991408Claude Opus 5
LMArena Text: entertainment and media14811386Claude Opus 5
LMArena Vision: English13151232Claude Opus 5
LMArena Vision: Chinese14001278Claude Opus 5
LMArena Vision: reading text13291246Claude Opus 5
LMArena Vision: humor12931266Claude Opus 5
LMArena Vision: captioningNot measured1259Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: recognizing thingsNot measured1308Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: creative writing13131248Claude Opus 5
LMArena Document1516Not measuredOnly Claude Opus 5 measured
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 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Opus 5Gemini 3.1 Flash Lite PreviewLeader
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 3.1 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$0.325Fits 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$1.25Fits 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 and Gemini 3.1 Flash Lite Preview
SpecificationAnthropic Claude Opus 5Google Gemini 3.1 Flash Lite Preview
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedJuly 24, 2026March 3, 2026
Context window1M1.05M
Input $/Mtok$5.00$0.25
Output $/Mtok$25.00$1.50
Coding index83.022.7
Independent measurements behind it63
Cost per solved task$1.33$0.18
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5 better than Gemini 3.1 Flash Lite Preview for coding?

Pick Claude Opus 5 for coding: it scores 83.0 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 16.7x cheaper ($1.50 vs $25.00 per million) and a lower cost per solved task ($0.18 against $1.33).

Which is cheaper, Claude Opus 5 or Gemini 3.1 Flash Lite Preview?

Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; Gemini 3.1 Flash Lite Preview costs $0.25 and $1.50. Per solved SWE-bench Verified task, Claude Opus 5 costs $1.33 and Gemini 3.1 Flash Lite Preview $0.18.

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

74 benchmarks have a result for both models as of October 22, 2026. Claude Opus 5's coding index rests on 6 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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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/claude-opus-5-vs-gemini-3-1-flash-lite-preview">LLMBenchmark.ai, Claude Opus 5 vs Gemini 3.1 Flash Lite Preview</a></p>