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Claude Sonnet 4.6 vs Gemini 2.5 Flash

Updated October 21, 2026. 59 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Sonnet 4.6 Replace Gemini 2.5 Flash
Claude Sonnet 4.6Anthropic
Coding
57.8
Overall
30.1
Output $/M
$15.00
58
Gemini 2.5 FlashGoogle
Coding
28.7
Overall
15.5
Output $/M
$2.50
1
vs boards won of 59 shared

Decision reading

Pick Claude Sonnet 4.6 for coding: it scores 57.8 on the Vibe Coding Index against 28.7 for Gemini 2.5 Flash.

Pick Gemini 2.5 Flash when output tokens cost 6.0x less, or when a solved task costs $0.466 against $1.68.

Model AClaude Sonnet 4.6Anthropic57.8/1002 independent benchmarks$1.68 per solved taskModel BGemini 2.5 FlashGoogle28.7/1001 independent benchmark$0.466 per solved task
Shared results
59
Claude Sonnet 4.6 only
58
Gemini 2.5 Flash only
10
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 Sonnet 4.6 57.8 from 2 benchmarks, Gemini 2.5 Flash 28.7 from 1 benchmark.
Widest category
Agentic work, 44.8 points apart on average over 2 shared benchmarks.
Widest single gap
ARC-AGI-2: Claude Sonnet 4.6 60.4% against Gemini 2.5 Flash 2.5%, 57.9 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 4.6 $15.00 against Gemini 2.5 Flash $2.50 per million output tokens, 6.0x apart.
Context window
Claude Sonnet 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 Sonnet 4.6BarsGemini 2.5 FlashTies
Coding40
Intelligence20
Agentic work20
Reasoning90
Math20
Knowledge40
Web design70
General281
All shared boards581
CodingLike-for-likeFour of these boards feed the Vibe Coding Index40
Coding benchmarks for Claude Sonnet 4.6 and Gemini 2.5 Flash
BenchmarkClaude Sonnet 4.6Gemini 2.5 FlashLeader
SWE-bench VerifiedNot measured28.7%Only Gemini 2.5 Flash measured
LiveBench coding66.6%Not measuredOnly Claude Sonnet 4.6 measured
LMArena WebDev1523Not measuredOnly Claude Sonnet 4.6 measured
AA Coding Index63.0Not measuredOnly Claude Sonnet 4.6 measured
LiveCodeBench (Vals AI)82.1%Not measuredOnly Claude Sonnet 4.6 measured
SWE-bench Verified (Vals AI)77.4%Not measuredOnly Claude Sonnet 4.6 measured
Vibe Code Bench (Vals AI)55.8%Not measuredOnly Claude Sonnet 4.6 measured
Code migration (Vals AI)39.9%Not measuredOnly Claude Sonnet 4.6 measured
ProgramBench (Vals AI)0.5%Not measuredOnly Claude Sonnet 4.6 measured
Terminal-Bench 2.1 (Vals AI)57.3%Not measuredOnly Claude Sonnet 4.6 measured
SkillsBench (Vals AI)49.0%Not measuredOnly Claude Sonnet 4.6 measured
LiveCodeBench (Artificial Analysis run)Not measured69.5%Only Gemini 2.5 Flash measured
SciCode50.1%Not measuredOnly Claude Sonnet 4.6 measured
Terminal-Bench Hard (Artificial Analysis run)53.0%13.6%Claude Sonnet 4.6
Terminal-Bench53.4%17.1%Claude Sonnet 4.6
FrontierCode24.3%Not measuredOnly Claude Sonnet 4.6 measured
WeirdML66.1%Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: coding15031423Claude Sonnet 4.6
LMArena Text: software and IT14911425Claude Sonnet 4.6
LMArena WebDev: React1512Not measuredOnly Claude Sonnet 4.6 measured
LMArena WebDev: HTML1527Not measuredOnly Claude Sonnet 4.6 measured
LMArena WebDev: from an image1529Not measuredOnly Claude Sonnet 4.6 measured
Neither model has a result on the other 16 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Sonnet 4.6 and Gemini 2.5 Flash
BenchmarkClaude Sonnet 4.6Gemini 2.5 FlashLeader
AA Intelligence Index30.115.5Claude Sonnet 4.6
Epoch Capabilities Index152.8142.9Claude Sonnet 4.6
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
Agentic work benchmarks for Claude Sonnet 4.6 and Gemini 2.5 Flash
BenchmarkClaude Sonnet 4.6Gemini 2.5 FlashLeader
AA Agentic Index31.8Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: agents building web apps1190Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: agents building full-stack apps1213Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: agents building mobile apps1212Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: agents building Android apps1202Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: agents building Godot games1226Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: agents building games1177Not measuredOnly Claude Sonnet 4.6 measured
LiveBench research63.6%Not measuredOnly Claude Sonnet 4.6 measured
LiveBench browser68.0%Not measuredOnly Claude Sonnet 4.6 measured
LiveBench long agentic23.1%Not measuredOnly Claude Sonnet 4.6 measured
Finance Agent (Vals AI)51.0%Not measuredOnly Claude Sonnet 4.6 measured
Tax Agent Bench (Vals AI)25.8%Not measuredOnly Claude Sonnet 4.6 measured
Legal Research Bench (Vals AI)38.5%Not measuredOnly Claude Sonnet 4.6 measured
Excel Modeling Benchmark (Vals AI)60.2%Not measuredOnly Claude Sonnet 4.6 measured
τ²-Bench Telecom79.5%31.6%Claude Sonnet 4.6
APEX-Agents43.0%Not measuredOnly Claude Sonnet 4.6 measured
OSWorld 2.09.3%Not measuredOnly Claude Sonnet 4.6 measured
BALROGNot measured33.5%Only Gemini 2.5 Flash measured
DeepResearch Bench54.9%Not measuredOnly Claude Sonnet 4.6 measured
OSWorld72.1%Not measuredOnly Claude Sonnet 4.6 measured
Vending-Bench 2$7,204$549Claude Sonnet 4.6
Neither model has a result on the other 18 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index90
Reasoning benchmarks for Claude Sonnet 4.6 and Gemini 2.5 Flash
BenchmarkClaude Sonnet 4.6Gemini 2.5 FlashLeader
GPQA Diamond85.6%Not measuredOnly Claude Sonnet 4.6 measured
LiveBench reasoning86.4%Not measuredOnly Claude Sonnet 4.6 measured
MMMU Pro (Vals AI)83.6%Not measuredOnly Claude Sonnet 4.6 measured
GPQA Diamond (Artificial Analysis run)87.5%79.0%Claude Sonnet 4.6
Humanity's Last Exam (Artificial Analysis run)33.6%12.1%Claude Sonnet 4.6
GPQA Diamond (Epoch AI run)87.4%Not measuredOnly Claude Sonnet 4.6 measured
ARC-AGI86.5%33.3%Claude Sonnet 4.6
ARC-AGI-260.4%2.5%Claude Sonnet 4.6
SimpleBenchNot measured41.2%Only Gemini 2.5 Flash measured
Chess puzzles23.0%Not measuredOnly Claude Sonnet 4.6 measured
Mystery game puzzles16.0%Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: hard prompts14851422Claude Sonnet 4.6
LMArena Text: expert15001426Claude Sonnet 4.6
LMArena Text: hard prompts in English14931420Claude Sonnet 4.6
LMArena Vision: diagrams13061245Claude Sonnet 4.6
LMArena Vision: homework13111244Claude Sonnet 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 Sonnet 4.6 and Gemini 2.5 Flash
BenchmarkClaude Sonnet 4.6Gemini 2.5 FlashLeader
AIME92.3%Not measuredOnly Claude Sonnet 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 AIME85.8%Not measuredOnly Claude Sonnet 4.6 measured
ProofBench45.0%Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: math14621411Claude Sonnet 4.6
LMArena Text: mathematical work14831422Claude Sonnet 4.6
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for Claude Sonnet 4.6 and Gemini 2.5 Flash
BenchmarkClaude Sonnet 4.6Gemini 2.5 FlashLeader
MMLU Pro87.3%Not measuredOnly Claude Sonnet 4.6 measured
LegalBench (Vals AI)82.1%Not measuredOnly Claude Sonnet 4.6 measured
CaseLaw (Vals AI)64.0%Not measuredOnly Claude Sonnet 4.6 measured
CorpFin (Vals AI)65.3%Not measuredOnly Claude Sonnet 4.6 measured
TaxEval (Vals AI)77.1%Not measuredOnly Claude Sonnet 4.6 measured
MortgageTax (Vals AI)67.7%Not measuredOnly Claude Sonnet 4.6 measured
MedQA (Vals AI)92.1%Not measuredOnly Claude Sonnet 4.6 measured
MedCode (Vals AI)Not measured40.4%Only Gemini 2.5 Flash measured
MMLU Pro (Artificial Analysis run)Not measured83.2%Only Gemini 2.5 Flash measured
SimpleQA Verified35.5%Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: science14741433Claude Sonnet 4.6
LMArena Text: medicine and healthcare14511428Claude Sonnet 4.6
LMArena Text: legal and government14701430Claude Sonnet 4.6
LMArena Text: business and finance14641404Claude Sonnet 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 Sonnet 4.6 and Gemini 2.5 Flash
BenchmarkClaude Sonnet 4.6Gemini 2.5 FlashLeader
Design Arena: websites12851074Claude Sonnet 4.6
Design Arena: UI components12711005Claude Sonnet 4.6
Design Arena: game dev12591005Claude Sonnet 4.6
Design Arena: data viz12781060Claude Sonnet 4.6
Design Arena: 3D12341021Claude Sonnet 4.6
Design Arena: all code categories12761059Claude Sonnet 4.6
Design Arena: SVG11961018Claude Sonnet 4.6
Design Arena: ASCII art1235Not measuredOnly Claude Sonnet 4.6 measured
LiveBench design71.8%Not measuredOnly Claude Sonnet 4.6 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index281
General benchmarks for Claude Sonnet 4.6 and Gemini 2.5 Flash
BenchmarkClaude Sonnet 4.6Gemini 2.5 FlashLeader
LiveBench data analysis76.1%Not measuredOnly Claude Sonnet 4.6 measured
Public Benefits Bench (Vals AI)62.5%Not measuredOnly Claude Sonnet 4.6 measured
SAGE (Vals AI)46.6%44.8%Claude Sonnet 4.6
MedScribe (Vals AI)Not measured83.0%Only Gemini 2.5 Flash measured
Vals Multimodal Index60.6%Not measuredOnly Claude Sonnet 4.6 measured
IFBench56.6%50.3%Claude Sonnet 4.6
Long context reasoning (AA-LCR)80.0%65.3%Claude Sonnet 4.6
DTBench89.9%76.5%Claude Sonnet 4.6
LMCA46.5%27.5%Claude Sonnet 4.6
ExploitBench23.6%Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text14581417Claude Sonnet 4.6
LMArena Text: instruction following14761405Claude Sonnet 4.6
LMArena Text: creative writing14351400Claude Sonnet 4.6
LMArena Vision12831235Claude Sonnet 4.6
LMArena Text: English14721418Claude Sonnet 4.6
LMArena Text: non-English14401409Claude Sonnet 4.6
LMArena Text: Chinese14911449Claude Sonnet 4.6
LMArena Text: German14281417Claude Sonnet 4.6
LMArena Text: Japanese14201396Claude Sonnet 4.6
LMArena Text: Korean14101385Claude Sonnet 4.6
LMArena Text: French14651432Claude Sonnet 4.6
LMArena Text: Spanish14641422Claude Sonnet 4.6
LMArena Text: Russian14401415Claude Sonnet 4.6
LMArena Text: Polish14431413Claude Sonnet 4.6
LMArena Text: multi-turn14641408Claude Sonnet 4.6
LMArena Text: longer queries14791419Claude Sonnet 4.6
LMArena Text: writing and language14441405Claude Sonnet 4.6
LMArena Text: entertainment and media14311393Claude Sonnet 4.6
LMArena Vision: English12981239Claude Sonnet 4.6
LMArena Vision: Chinese13071284Claude Sonnet 4.6
LMArena Vision: reading text12961237Claude Sonnet 4.6
LMArena Vision: humor12481225Claude Sonnet 4.6
LMArena Vision: captioningNot measured1277Only Gemini 2.5 Flash measured
LMArena Vision: recognizing things11951252Gemini 2.5 Flash
LMArena Vision: creative writing12721241Claude Sonnet 4.6
LMArena Document1482Not measuredOnly Claude Sonnet 4.6 measured
Neither model has a result on the other 10 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Sonnet 4.6 and Gemini 2.5 Flash
BenchmarkClaude Sonnet 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 Sonnet 4.6$0.011Fits 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 Sonnet 4.6$0.195Fits 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 Sonnet 4.6$0.750Fits 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 Sonnet 4.6 and Gemini 2.5 Flash
SpecificationAnthropic Claude Sonnet 4.6Google Gemini 2.5 Flash
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedFebruary 17, 2026June 17, 2025
Context window1M1.05M
Input $/Mtok$3.00$0.30
Output $/Mtok$15.00$2.50
Coding index57.828.7
Independent measurements behind it21
Cost per solved task$1.68$0.466
SourceOpenRouter listingOpenRouter listing

Questions

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

Pick Claude Sonnet 4.6 for coding: it scores 57.8 on the Vibe Coding Index against 28.7 for Gemini 2.5 Flash. Pick Gemini 2.5 Flash when output tokens cost 6.0x less, or when a solved task costs $0.466 against $1.68.

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

Claude Sonnet 4.6 costs $3.00 per million input tokens and $15.00 per million output tokens; Gemini 2.5 Flash costs $0.30 and $2.50. Per solved SWE-bench Verified task, Claude Sonnet 4.6 costs $1.68 and Gemini 2.5 Flash $0.466.

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

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

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

59 benchmarks have a result for both models as of October 21, 2026. Claude Sonnet 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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