Enter opens the highlighted result. Esc closes.

Claude Opus 4.6 vs Gemini 3.5 Flash

Claude Opus 4.6 leads Gemini 3.5 Flash on coding, 57.2 to 39.8 on the Vibe Coding Index, and Gemini 3.5 Flash costs 2.8x less per output token ($9.00 vs $25.00 per million). Updated October 21, 2026; 93 benchmarks have a result for both.

Replace Claude Opus 4.6 Replace Gemini 3.5 Flash
Claude Opus 4.6Anthropic
Coding
57.2
Overall
66.0
Output $/M
$25.00
68
Gemini 3.5 FlashGoogle
Coding
39.8
Overall
63.8
Output $/M
$9.00
24
vs boards won of 93 shared, 1 tied

Claude Opus 4.6 or Gemini 3.5 Flash: which to pick

Pick Claude Opus 4.6 for coding: it scores 57.2 on the Vibe Coding Index against 39.8 for Gemini 3.5 Flash.

Pick Gemini 3.5 Flash for output tokens 2.8x cheaper ($9.00 vs $25.00 per million) and a lower cost per solved task ($1.21 against $1.56).

Model AClaude Opus 4.6Anthropic57.2/1004 independent benchmarks$1.56 per solved taskModel BGemini 3.5 FlashGoogle39.8/1004 independent benchmarks$1.21 per solved task
Shared results
93
Claude Opus 4.6 only
17
Gemini 3.5 Flash only
19
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 4.6 57.2 from 4 benchmarks, Gemini 3.5 Flash 39.8 from 4 benchmarks.
Widest category
Agentic work, 6.5 points apart on average over 8 shared benchmarks.
Widest single gap
Chess puzzles: Claude Opus 4.6 21.0% against Gemini 3.5 Flash 45.0%, 24.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.6 $25.00 against Gemini 3.5 Flash $9.00 per million output tokens, 2.8x apart.
Context window
Claude Opus 4.6 takes 1M tokens, Gemini 3.5 Flash 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 4.6BarsGemini 3.5 FlashTies
Coding92
Intelligence11
Agentic work71
Reasoning79
Math411 tie
Knowledge84
Web design71
General255
All shared boards68241 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index92
Coding benchmarks for Claude Opus 4.6 and Gemini 3.5 Flash
BenchmarkClaude Opus 4.6Gemini 3.5 FlashLeader
SWE-bench Verified75.6%Not measuredOnly Claude Opus 4.6 measured
SWE-bench Multilingual72.0%Not measuredOnly Claude Opus 4.6 measured
LMArena WebDev15471499Claude Opus 4.6
LiveCodeBench (Vals AI)84.7%87.6%Gemini 3.5 Flash
SWE-bench Verified (Vals AI)78.2%78.8%Gemini 3.5 Flash
Terminal-Bench 4 (Vals AI)Not measured6.1%Only Gemini 3.5 Flash measured
Vibe Code Bench (Vals AI)57.6%48.7%Claude Opus 4.6
Code migration (Vals AI)Not measured26.8%Only Gemini 3.5 Flash measured
ProgramBench (Vals AI)Not measured0.0%Only Gemini 3.5 Flash measured
Terminal-Bench 2.1 (Vals AI)Not measured74.2%Only Gemini 3.5 Flash measured
SkillsBench (Vals AI)Not measured52.7%Only Gemini 3.5 Flash measured
SciCodeNot measured53.9%Only Gemini 3.5 Flash measured
Terminal-Bench Hard (Artificial Analysis run)48.5%46.2%Claude Opus 4.6
Terminal-Bench79.8%Not measuredOnly Claude Opus 4.6 measured
FrontierCode26.6%Not measuredOnly Claude Opus 4.6 measured
GSO-Bench41.2%Not measuredOnly Claude Opus 4.6 measured
WeirdML78.0%62.6%Claude Opus 4.6
Cybench93.0%Not measuredOnly Claude Opus 4.6 measured
ALE-BenchNot measured911.0Only Gemini 3.5 Flash measured
LMArena Text: coding15341493Claude Opus 4.6
LMArena Text: software and IT15271494Claude Opus 4.6
LMArena WebDev: React15391495Claude Opus 4.6
LMArena WebDev: HTML15591522Claude Opus 4.6
LMArena WebDev: from an image15431504Claude Opus 4.6
SciCodeNot measured12.3%Only Gemini 3.5 Flash measured
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for Claude Opus 4.6 and Gemini 3.5 Flash
BenchmarkClaude Opus 4.6Gemini 3.5 FlashLeader
AA Intelligence Index31.933.6Gemini 3.5 Flash
Epoch Capabilities Index155.7154.9Claude Opus 4.6
Agentic workLike-for-likePublic boards, shown as published, kept out of the index71
Agentic work benchmarks for Claude Opus 4.6 and Gemini 3.5 Flash
BenchmarkClaude Opus 4.6Gemini 3.5 FlashLeader
Design Arena: agents building web apps12061202Claude Opus 4.6
Design Arena: agents building full-stack apps12201197Claude Opus 4.6
Design Arena: agents building mobile apps12071174Claude Opus 4.6
Design Arena: agents building Android apps11961184Claude Opus 4.6
Design Arena: agents building Godot gamesNot measured1098Only Gemini 3.5 Flash measured
Design Arena: agents building games12121180Claude Opus 4.6
Design Arena: HTML slidesNot measured1142Only Gemini 3.5 Flash measured
Design Arena: PowerPoint slidesNot measured1179Only Gemini 3.5 Flash measured
Finance Agent (Vals AI)Not measured57.9%Only Gemini 3.5 Flash measured
Tax Agent Bench (Vals AI)Not measured21.6%Only Gemini 3.5 Flash measured
Legal Research Bench (Vals AI)Not measured30.8%Only Gemini 3.5 Flash measured
Excel Modeling Benchmark (Vals AI)Not measured63.5%Only Gemini 3.5 Flash measured
Terminal-Bench-Science (Vals AI)Not measured5.7%Only Gemini 3.5 Flash measured
τ²-Bench Telecom92.1%95.6%Gemini 3.5 Flash
APEX-Agents46.3%27.5%Claude Opus 4.6
METR time horizons78.9%Not measuredOnly Claude Opus 4.6 measured
Remote Labor Index4.2%Not measuredOnly Claude Opus 4.6 measured
DeepResearch Bench55.3%Not measuredOnly Claude Opus 4.6 measured
Vending-Bench 2$8,018$5,396Claude Opus 4.6
Neither model has a result on the other 22 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index79
Reasoning benchmarks for Claude Opus 4.6 and Gemini 3.5 Flash
BenchmarkClaude Opus 4.6Gemini 3.5 FlashLeader
GPQA Diamond89.7%92.7%Gemini 3.5 Flash
MMMU Pro (Vals AI)83.9%88.3%Gemini 3.5 Flash
GPQA Diamond (Artificial Analysis run)89.6%92.2%Gemini 3.5 Flash
Humanity's Last Exam (Artificial Analysis run)39.9%42.7%Gemini 3.5 Flash
GPQA Diamond (Epoch AI run)90.5%92.8%Gemini 3.5 Flash
ARC-AGI94.0%92.5%Claude Opus 4.6
ARC-AGI-269.2%72.1%Gemini 3.5 Flash
SimpleBench67.6%76.7%Gemini 3.5 Flash
Chess puzzles21.0%45.0%Gemini 3.5 Flash
Mystery game puzzles25.0%32.0%Gemini 3.5 Flash
EBR-bench12.7%4.8%Claude Opus 4.6
LMArena Text: hard prompts15251488Claude Opus 4.6
LMArena Text: expert15441495Claude Opus 4.6
LMArena Text: hard prompts in English15301483Claude Opus 4.6
LMArena Vision: diagrams13401323Claude Opus 4.6
LMArena Vision: homework13371330Claude Opus 4.6
Kagi LLM Benchmark83.6%Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index41
Math benchmarks for Claude Opus 4.6 and Gemini 3.5 Flash
BenchmarkClaude Opus 4.6Gemini 3.5 FlashLeader
AIME95.6%Not measuredOnly Claude Opus 4.6 measured
OTIS Mock AIME94.4%95.6%Gemini 3.5 Flash
FrontierMath, tiers 1 to 366.0%62.8%Claude Opus 4.6
FrontierMath, tier 426.8%26.8%Tie
ProofBench50.0%31.0%Claude Opus 4.6
LMArena Text: math15181504Claude Opus 4.6
LMArena Text: mathematical work15251495Claude Opus 4.6
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index84
Knowledge benchmarks for Claude Opus 4.6 and Gemini 3.5 Flash
BenchmarkClaude Opus 4.6Gemini 3.5 FlashLeader
MMLU Pro89.1%89.5%Gemini 3.5 Flash
LegalBench (Vals AI)85.3%83.6%Claude Opus 4.6
CaseLaw (Vals AI)62.1%Not measuredOnly Claude Opus 4.6 measured
CorpFin (Vals AI)67.0%64.7%Claude Opus 4.6
TaxEval (Vals AI)76.0%74.4%Claude Opus 4.6
MortgageTax (Vals AI)68.5%68.1%Claude Opus 4.6
MedQA (Vals AI)95.4%Not measuredOnly Claude Opus 4.6 measured
MedCode (Vals AI)49.1%55.8%Gemini 3.5 Flash
SimpleQA Verified47.0%66.2%Gemini 3.5 Flash
LMArena Text: science15191495Claude Opus 4.6
LMArena Text: medicine and healthcare15041483Claude Opus 4.6
LMArena Text: legal and government15121488Claude Opus 4.6
LMArena Text: business and finance14971467Claude Opus 4.6
FACTS Benchmark Suite41.5%63.1%Gemini 3.5 Flash
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index71
Web design benchmarks for Claude Opus 4.6 and Gemini 3.5 Flash
BenchmarkClaude Opus 4.6Gemini 3.5 FlashLeader
Design Arena: websites12911268Claude Opus 4.6
Design Arena: UI components12841273Claude Opus 4.6
Design Arena: game dev12781263Claude Opus 4.6
Design Arena: data viz12791236Claude Opus 4.6
Design Arena: 3D12741244Claude Opus 4.6
Design Arena: all code categories12891266Claude Opus 4.6
Design Arena: SVG12281254Gemini 3.5 Flash
Design Arena: ASCII art12551254Claude Opus 4.6
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index255
General benchmarks for Claude Opus 4.6 and Gemini 3.5 Flash
BenchmarkClaude Opus 4.6Gemini 3.5 FlashLeader
Public Benefits Bench (Vals AI)Not measured59.5%Only Gemini 3.5 Flash measured
SAGE (Vals AI)51.6%49.9%Claude Opus 4.6
MedScribe (Vals AI)86.7%76.6%Claude Opus 4.6
Vals Multimodal IndexNot measured62.9%Only Gemini 3.5 Flash measured
IFBench53.1%76.3%Gemini 3.5 Flash
Long context reasoning (AA-LCR)78.0%74.3%Claude Opus 4.6
DTBench91.2%94.7%Gemini 3.5 Flash
LMCA55.8%47.1%Claude Opus 4.6
CL-bench20.7%Not measuredOnly Claude Opus 4.6 measured
Surface Evolver BenchNot measured58.1%Only Gemini 3.5 Flash measured
Furniture assembly28.3%Not measuredOnly Claude Opus 4.6 measured
CL-bench Life17.0%Not measuredOnly Claude Opus 4.6 measured
LMArena Text15011482Claude Opus 4.6
LMArena Text: instruction following15211467Claude Opus 4.6
LMArena Text: creative writing15051470Claude Opus 4.6
LMArena Vision13161308Claude Opus 4.6
LMArena Text: English15111481Claude Opus 4.6
LMArena Text: non-English14881475Claude Opus 4.6
LMArena Text: Chinese15511527Claude Opus 4.6
LMArena Text: German15001494Claude Opus 4.6
LMArena Text: Japanese14881486Claude Opus 4.6
LMArena Text: Korean14641448Claude Opus 4.6
LMArena Text: French15121490Claude Opus 4.6
LMArena Text: Spanish15101480Claude Opus 4.6
LMArena Text: Russian14971493Claude Opus 4.6
LMArena Text: Polish14991516Gemini 3.5 Flash
LMArena Text: multi-turn15111481Claude Opus 4.6
LMArena Text: longer queries15181483Claude Opus 4.6
LMArena Text: writing and language15021478Claude Opus 4.6
LMArena Text: entertainment and media14921459Claude Opus 4.6
LMArena Vision: English13241305Claude Opus 4.6
LMArena Vision: Chinese13701377Gemini 3.5 Flash
LMArena Vision: reading text13261317Claude Opus 4.6
LMArena Vision: humor13141321Gemini 3.5 Flash
LMArena Vision: recognizing things1274Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: creative writing13311301Claude Opus 4.6
LMArena Document15071463Claude Opus 4.6
Neither model has a result on the other 9 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.6 and Gemini 3.5 Flash
BenchmarkClaude Opus 4.6Gemini 3.5 FlashLeader
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 4.6$0.018Fits in one request
Gemini 3.5 Flash$0.0060Fits in one request

Gemini 3.5 Flash costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.6$0.325Fits in one request
Gemini 3.5 Flash$0.102Fits in one request

Gemini 3.5 Flash costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.6$1.25Fits in one request
Gemini 3.5 Flash$0.390Fits in one request

Gemini 3.5 Flash 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 4.6 and Gemini 3.5 Flash
SpecificationAnthropic Claude Opus 4.6Google Gemini 3.5 Flash
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedFebruary 4, 2026May 19, 2026
Context window1M1.05M
Input $/Mtok$5.00$1.50
Output $/Mtok$25.00$9.00
Coding index57.239.8
Independent measurements behind it44
Cost per solved task$1.56$1.21
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.6 better than Gemini 3.5 Flash for coding?

Pick Claude Opus 4.6 for coding: it scores 57.2 on the Vibe Coding Index against 39.8 for Gemini 3.5 Flash. Pick Gemini 3.5 Flash for output tokens 2.8x cheaper ($9.00 vs $25.00 per million) and a lower cost per solved task ($1.21 against $1.56).

Which is cheaper, Claude Opus 4.6 or Gemini 3.5 Flash?

Claude Opus 4.6 costs $5.00 per million input tokens and $25.00 per million output tokens; Gemini 3.5 Flash costs $1.50 and $9.00. Per solved SWE-bench Verified task, Claude Opus 4.6 costs $1.56 and Gemini 3.5 Flash $1.21.

Which has the bigger context window, Claude Opus 4.6 or Gemini 3.5 Flash?

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

How many benchmarks is the Claude Opus 4.6 vs Gemini 3.5 Flash comparison based on?

93 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.6's coding index rests on 4 independent benchmarks and Gemini 3.5 Flash'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-4-6-vs-gemini-3-5-flash" title="Claude Opus 4.6 vs Gemini 3.5 Flash, 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-4-6-vs-gemini-3-5-flash">LLMBenchmark.ai, Claude Opus 4.6 vs Gemini 3.5 Flash</a></p>