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Claude Opus 4.6 vs Gemini 2.5 Flash

Updated October 21, 2026. 63 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 4.6 Replace Gemini 2.5 Flash
Claude Opus 4.6Anthropic
Coding
66.9
Overall
31.9
Output $/M
$25.00
63
Gemini 2.5 FlashGoogle
Coding
28.7
Overall
15.5
Output $/M
$2.50
0
vs boards won of 63 shared

Decision reading

Pick Claude Opus 4.6 for coding: it scores 66.9 on the Vibe Coding Index against 28.7 for Gemini 2.5 Flash.

Pick Gemini 2.5 Flash when output tokens cost 10.0x less, or when a solved task costs $0.466 against $1.56.

Model AClaude Opus 4.6Anthropic66.9/1002 independent benchmarks$1.56 per solved taskModel BGemini 2.5 FlashGoogle28.7/1001 independent benchmark$0.466 per solved task
Shared results
63
Claude Opus 4.6 only
45
Gemini 2.5 Flash only
6
Like-for-like categories
8 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.

At a glance

Coding index
Claude Opus 4.6 66.9 from 2 benchmarks, Gemini 2.5 Flash 28.7 from 1 benchmark.
Widest category
Agentic work, 53.6 points apart on average over 2 shared benchmarks.
Widest single gap
ARC-AGI-2: Claude Opus 4.6 69.2% against Gemini 2.5 Flash 2.5%, 66.6 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.6 $25.00 against Gemini 2.5 Flash $2.50 per million output tokens, 10.0x apart.
Context window
Claude Opus 4.6 takes 1M tokens, Gemini 2.5 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 2.5 FlashTies
Coding50
Intelligence20
Agentic work20
Reasoning100
Math20
Knowledge50
Web design70
General300
All shared boards630
CodingLike-for-likeFour of these boards feed the Vibe Coding Index50
Coding benchmarks for Claude Opus 4.6 and Gemini 2.5 Flash
BenchmarkClaude Opus 4.6Gemini 2.5 FlashLeader
SWE-bench Verified75.6%28.7%Claude Opus 4.6
SWE-bench Multilingual72.0%Not measuredOnly Claude Opus 4.6 measured
LMArena WebDev1547Not measuredOnly Claude Opus 4.6 measured
LiveCodeBench (Vals AI)84.7%Not measuredOnly Claude Opus 4.6 measured
SWE-bench Verified (Vals AI)78.2%Not measuredOnly Claude Opus 4.6 measured
Vibe Code Bench (Vals AI)57.6%Not measuredOnly Claude Opus 4.6 measured
LiveCodeBench (Artificial Analysis run)Not measured69.5%Only Gemini 2.5 Flash measured
Terminal-Bench Hard (Artificial Analysis run)48.5%13.6%Claude Opus 4.6
Terminal-Bench79.8%17.1%Claude Opus 4.6
FrontierCode26.6%Not measuredOnly Claude Opus 4.6 measured
GSO-Bench41.2%Not measuredOnly Claude Opus 4.6 measured
WeirdML78.0%Not measuredOnly Claude Opus 4.6 measured
Cybench93.0%Not measuredOnly Claude Opus 4.6 measured
LMArena Text: coding15341423Claude Opus 4.6
LMArena Text: software and IT15271425Claude Opus 4.6
LMArena WebDev: React1539Not measuredOnly Claude Opus 4.6 measured
LMArena WebDev: HTML1559Not measuredOnly Claude Opus 4.6 measured
LMArena WebDev: from an image1543Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 20 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 4.6 and Gemini 2.5 Flash
BenchmarkClaude Opus 4.6Gemini 2.5 FlashLeader
AA Intelligence Index31.915.5Claude Opus 4.6
Epoch Capabilities Index155.7142.9Claude Opus 4.6
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
Agentic work benchmarks for Claude Opus 4.6 and Gemini 2.5 Flash
BenchmarkClaude Opus 4.6Gemini 2.5 FlashLeader
Design Arena: agents building web apps1206Not measuredOnly Claude Opus 4.6 measured
Design Arena: agents building full-stack apps1220Not measuredOnly Claude Opus 4.6 measured
Design Arena: agents building mobile apps1207Not measuredOnly Claude Opus 4.6 measured
Design Arena: agents building Android apps1204Not measuredOnly Claude Opus 4.6 measured
Design Arena: agents building games1214Not measuredOnly Claude Opus 4.6 measured
τ²-Bench Telecom92.1%31.6%Claude Opus 4.6
APEX-Agents46.3%Not measuredOnly Claude Opus 4.6 measured
METR time horizons78.9%Not measuredOnly Claude Opus 4.6 measured
Remote Labor Index4.2%Not measuredOnly Claude Opus 4.6 measured
BALROGNot measured33.5%Only Gemini 2.5 Flash measured
DeepResearch Bench55.3%Not measuredOnly Claude Opus 4.6 measured
Vending-Bench 2$8,018$549Claude Opus 4.6
Neither model has a result on the other 27 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index100
Reasoning benchmarks for Claude Opus 4.6 and Gemini 2.5 Flash
BenchmarkClaude Opus 4.6Gemini 2.5 FlashLeader
GPQA Diamond89.7%Not measuredOnly Claude Opus 4.6 measured
MMMU Pro (Vals AI)83.9%Not measuredOnly Claude Opus 4.6 measured
GPQA Diamond (Artificial Analysis run)89.6%79.0%Claude Opus 4.6
Humanity's Last Exam (Artificial Analysis run)39.9%12.1%Claude Opus 4.6
GPQA Diamond (Epoch AI run)90.5%Not measuredOnly Claude Opus 4.6 measured
ARC-AGI94.0%33.3%Claude Opus 4.6
ARC-AGI-269.2%2.5%Claude Opus 4.6
SimpleBench67.6%41.2%Claude Opus 4.6
Chess puzzles21.0%Not measuredOnly Claude Opus 4.6 measured
Mystery game puzzles25.0%Not measuredOnly Claude Opus 4.6 measured
EBR-bench12.7%Not measuredOnly Claude Opus 4.6 measured
LMArena Text: hard prompts15251422Claude Opus 4.6
LMArena Text: expert15441426Claude Opus 4.6
LMArena Text: hard prompts in English15301420Claude Opus 4.6
LMArena Vision: diagrams13401245Claude Opus 4.6
LMArena Vision: homework13371244Claude Opus 4.6
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for Claude Opus 4.6 and Gemini 2.5 Flash
BenchmarkClaude Opus 4.6Gemini 2.5 FlashLeader
AIME95.6%Not measuredOnly Claude Opus 4.6 measured
AA Math IndexNot measured73.3Only Gemini 2.5 Flash measured
AIME 2025 (Artificial Analysis run)Not measured73.3%Only Gemini 2.5 Flash measured
OTIS Mock AIME94.4%Not measuredOnly Claude Opus 4.6 measured
FrontierMath, tiers 1 to 366.0%Not measuredOnly Claude Opus 4.6 measured
FrontierMath, tier 426.8%Not measuredOnly Claude Opus 4.6 measured
ProofBench50.0%Not measuredOnly Claude Opus 4.6 measured
LMArena Text: math15181411Claude Opus 4.6
LMArena Text: mathematical work15251422Claude Opus 4.6
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index50
Knowledge benchmarks for Claude Opus 4.6 and Gemini 2.5 Flash
BenchmarkClaude Opus 4.6Gemini 2.5 FlashLeader
MMLU Pro89.1%Not measuredOnly Claude Opus 4.6 measured
LegalBench (Vals AI)85.3%Not measuredOnly Claude Opus 4.6 measured
CaseLaw (Vals AI)62.1%Not measuredOnly Claude Opus 4.6 measured
CorpFin (Vals AI)67.0%Not measuredOnly Claude Opus 4.6 measured
TaxEval (Vals AI)76.0%Not measuredOnly Claude Opus 4.6 measured
MortgageTax (Vals AI)68.5%Not measuredOnly Claude Opus 4.6 measured
MedQA (Vals AI)95.4%Not measuredOnly Claude Opus 4.6 measured
MedCode (Vals AI)49.1%40.4%Claude Opus 4.6
MMLU Pro (Artificial Analysis run)Not measured83.2%Only Gemini 2.5 Flash measured
SimpleQA Verified47.0%Not measuredOnly Claude Opus 4.6 measured
LMArena Text: science15191433Claude Opus 4.6
LMArena Text: medicine and healthcare15041428Claude Opus 4.6
LMArena Text: legal and government15121430Claude Opus 4.6
LMArena Text: business and finance14971404Claude Opus 4.6
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index70
Web design benchmarks for Claude Opus 4.6 and Gemini 2.5 Flash
BenchmarkClaude Opus 4.6Gemini 2.5 FlashLeader
Design Arena: websites12911074Claude Opus 4.6
Design Arena: UI components12841005Claude Opus 4.6
Design Arena: game dev12781005Claude Opus 4.6
Design Arena: data viz12791060Claude Opus 4.6
Design Arena: 3D12741021Claude Opus 4.6
Design Arena: all code categories12891059Claude Opus 4.6
Design Arena: SVG12271018Claude Opus 4.6
Design Arena: ASCII art1254Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index300
General benchmarks for Claude Opus 4.6 and Gemini 2.5 Flash
BenchmarkClaude Opus 4.6Gemini 2.5 FlashLeader
SAGE (Vals AI)51.6%44.8%Claude Opus 4.6
MedScribe (Vals AI)86.7%83.0%Claude Opus 4.6
IFBench53.1%50.3%Claude Opus 4.6
Long context reasoning (AA-LCR)78.0%65.3%Claude Opus 4.6
DTBench91.2%76.5%Claude Opus 4.6
LMCA55.8%27.5%Claude Opus 4.6
CL-bench20.7%Not measuredOnly Claude Opus 4.6 measured
Furniture assembly28.3%Not measuredOnly Claude Opus 4.6 measured
CL-bench Life17.0%Not measuredOnly Claude Opus 4.6 measured
LMArena Text15011417Claude Opus 4.6
LMArena Text: instruction following15211405Claude Opus 4.6
LMArena Text: creative writing15051400Claude Opus 4.6
LMArena Vision13161235Claude Opus 4.6
LMArena Text: English15111418Claude Opus 4.6
LMArena Text: non-English14881409Claude Opus 4.6
LMArena Text: Chinese15511449Claude Opus 4.6
LMArena Text: German15001417Claude Opus 4.6
LMArena Text: Japanese14881396Claude Opus 4.6
LMArena Text: Korean14641385Claude Opus 4.6
LMArena Text: French15121432Claude Opus 4.6
LMArena Text: Spanish15101422Claude Opus 4.6
LMArena Text: Russian14971415Claude Opus 4.6
LMArena Text: Polish14991413Claude Opus 4.6
LMArena Text: multi-turn15111408Claude Opus 4.6
LMArena Text: longer queries15181419Claude Opus 4.6
LMArena Text: writing and language15021405Claude Opus 4.6
LMArena Text: entertainment and media14921393Claude Opus 4.6
LMArena Vision: English13241239Claude Opus 4.6
LMArena Vision: Chinese13701284Claude Opus 4.6
LMArena Vision: reading text13261237Claude Opus 4.6
LMArena Vision: humor13141225Claude Opus 4.6
LMArena Vision: captioningNot measured1277Only Gemini 2.5 Flash measured
LMArena Vision: recognizing things12741252Claude Opus 4.6
LMArena Vision: creative writing13311241Claude Opus 4.6
LMArena Document1507Not measuredOnly Claude Opus 4.6 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 4.6 and Gemini 2.5 Flash
BenchmarkClaude Opus 4.6Gemini 2.5 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 2.5 Flash$0.0015Fits in one request

Gemini 2.5 Flash costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.6$0.325Fits in one request
Gemini 2.5 Flash$0.022Fits in one request

Gemini 2.5 Flash costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.6$1.25Fits in one request
Gemini 2.5 Flash$0.085Fits in one request

Gemini 2.5 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 2.5 Flash
SpecificationAnthropic Claude Opus 4.6Google Gemini 2.5 Flash
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedFebruary 4, 2026June 17, 2025
Context window1M1.05M
Input $/Mtok$5.00$0.30
Output $/Mtok$25.00$2.50
Coding index66.928.7
Independent measurements behind it21
Cost per solved task$1.56$0.466
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.6 better than Gemini 2.5 Flash for coding?

Pick Claude Opus 4.6 for coding: it scores 66.9 on the Vibe Coding Index against 28.7 for Gemini 2.5 Flash. Pick Gemini 2.5 Flash when output tokens cost 10.0x less, or when a solved task costs $0.466 against $1.56.

Which is cheaper, Claude Opus 4.6 or Gemini 2.5 Flash?

Claude Opus 4.6 costs $5.00 per million input tokens and $25.00 per million output tokens; Gemini 2.5 Flash costs $0.30 and $2.50. Per solved SWE-bench Verified task, Claude Opus 4.6 costs $1.56 and Gemini 2.5 Flash $0.466.

Which has the bigger context window, Claude Opus 4.6 or Gemini 2.5 Flash?

Gemini 2.5 Flash, with 1.05M tokens against 1M.

How many benchmarks is the Claude Opus 4.6 vs Gemini 2.5 Flash comparison based on?

63 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.6's coding index rests on 2 independent benchmarks and Gemini 2.5 Flash's on 1. Where only one model has a result, the page says so instead of naming a winner.

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