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Gemini 3.5 Flash vs Grok 4.3

Gemini 3.5 Flash leads Grok 4.3 on coding, 39.8 to 37.4 on the Vibe Coding Index, and Grok 4.3 costs 3.6x less per output token ($2.50 vs $9.00 per million). Updated October 22, 2026; 99 benchmarks have a result for both.

Replace Gemini 3.5 Flash Replace Grok 4.3
Gemini 3.5 FlashGoogle
Coding
39.8
Overall
63.8
Output $/M
$9.00
92
Grok 4.3xAI
Coding
37.4
Overall
53.1
Output $/M
$2.50
6
vs boards won of 99 shared, 1 tied

Gemini 3.5 Flash or Grok 4.3: which to pick

Pick Gemini 3.5 Flash for coding: it scores 39.8 on the Vibe Coding Index against 37.4 for Grok 4.3.

Pick Grok 4.3 for output tokens 3.6x cheaper ($2.50 vs $9.00 per million) and a lower cost per solved task ($0.31 against $1.21).

Model AGemini 3.5 FlashGoogle39.8/1004 independent benchmarks$1.21 per solved taskModel BGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved task
Shared results
99
Gemini 3.5 Flash only
13
Grok 4.3 only
6
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
Gemini 3.5 Flash 39.8 from 4 benchmarks, Grok 4.3 37.4 from 3 benchmarks.
Widest category
Agentic work, 20.7 points apart on average over 14 shared benchmarks.
Widest single gap
Excel Modeling Benchmark (Vals AI): Gemini 3.5 Flash 63.5% against Grok 4.3 18.4%, 45.2 points apart on a 0 to 100 scale.
Output price
Gemini 3.5 Flash $9.00 against Grok 4.3 $2.50 per million output tokens, 3.6x apart.
Context window
Gemini 3.5 Flash takes 1.05M tokens, Grok 4.3 1M.

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
CategoryGemini 3.5 FlashBarsGrok 4.3Ties
Coding1511 tie
Intelligence10
Agentic work131
Reasoning110
Math60
Knowledge92
Web design80
General292
All shared boards9261 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index151
Coding benchmarks for Gemini 3.5 Flash and Grok 4.3
BenchmarkGemini 3.5 FlashGrok 4.3Leader
LMArena WebDev14991358Gemini 3.5 Flash
AA Coding IndexNot measured42.2Only Grok 4.3 measured
LiveCodeBench (Vals AI)87.6%84.5%Gemini 3.5 Flash
SWE-bench Verified (Vals AI)78.8%71.4%Gemini 3.5 Flash
Terminal-Bench 4 (Vals AI)6.1%Not measuredOnly Gemini 3.5 Flash measured
Vibe Code Bench (Vals AI)48.7%19.4%Gemini 3.5 Flash
Code migration (Vals AI)26.8%6.8%Gemini 3.5 Flash
ProgramBench (Vals AI)0.0%0.0%Tie
Terminal-Bench 2.1 (Vals AI)74.2%42.0%Gemini 3.5 Flash
SkillsBench (Vals AI)52.7%40.6%Gemini 3.5 Flash
SciCode53.9%48.3%Gemini 3.5 Flash
Terminal-Bench Hard (Artificial Analysis run)46.2%37.9%Gemini 3.5 Flash
WeirdML62.6%49.9%Gemini 3.5 Flash
ALE-Bench911.0944.2Grok 4.3
LMArena Text: coding14931415Gemini 3.5 Flash
LMArena Text: software and IT14941416Gemini 3.5 Flash
LMArena WebDev: React14951353Gemini 3.5 Flash
LMArena WebDev: HTML15221367Gemini 3.5 Flash
LMArena WebDev: from an image15041375Gemini 3.5 Flash
SciCode12.3%Not measuredOnly Gemini 3.5 Flash measured
Neither model has a result on the other 19 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Gemini 3.5 Flash and Grok 4.3
BenchmarkGemini 3.5 FlashGrok 4.3Leader
AA Intelligence Index33.624.9Gemini 3.5 Flash
Epoch Capabilities Index154.9Not measuredOnly Gemini 3.5 Flash measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index131
Agentic work benchmarks for Gemini 3.5 Flash and Grok 4.3
BenchmarkGemini 3.5 FlashGrok 4.3Leader
AA Agentic IndexNot measured15.5Only Grok 4.3 measured
Design Arena: agents building web apps12021126Gemini 3.5 Flash
Design Arena: agents building full-stack apps11971006Gemini 3.5 Flash
Design Arena: agents building mobile apps11741058Gemini 3.5 Flash
Design Arena: agents building Android apps1185962Gemini 3.5 Flash
Design Arena: agents building Godot games1098914Gemini 3.5 Flash
Design Arena: agents building games11801007Gemini 3.5 Flash
Design Arena: HTML slides1093959Gemini 3.5 Flash
Design Arena: PowerPoint slides1154988Gemini 3.5 Flash
Design Arena: spreadsheetsNot measured879Only Grok 4.3 measured
Finance Agent (Vals AI)57.9%37.7%Gemini 3.5 Flash
Tax Agent Bench (Vals AI)21.6%6.2%Gemini 3.5 Flash
Legal Research Bench (Vals AI)30.8%15.4%Gemini 3.5 Flash
Excel Modeling Benchmark (Vals AI)63.5%18.4%Gemini 3.5 Flash
Terminal-Bench-Science (Vals AI)5.7%Not measuredOnly Gemini 3.5 Flash measured
τ²-Bench Telecom95.6%97.7%Grok 4.3
APEX-Agents27.5%Not measuredOnly Gemini 3.5 Flash measured
Vending-Bench 2$5,396$35Gemini 3.5 Flash
LMArena SearchNot measured1166Only Grok 4.3 measured
Neither model has a result on the other 22 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index110
Reasoning benchmarks for Gemini 3.5 Flash and Grok 4.3
BenchmarkGemini 3.5 FlashGrok 4.3Leader
GPQA Diamond92.7%91.4%Gemini 3.5 Flash
MMMU Pro (Vals AI)88.3%83.1%Gemini 3.5 Flash
GPQA Diamond (Artificial Analysis run)92.2%90.1%Gemini 3.5 Flash
Humanity's Last Exam (Artificial Analysis run)42.7%37.2%Gemini 3.5 Flash
GPQA Diamond (Epoch AI run)92.8%88.8%Gemini 3.5 Flash
ARC-AGI92.5%Not measuredOnly Gemini 3.5 Flash measured
ARC-AGI-272.1%Not measuredOnly Gemini 3.5 Flash measured
SimpleBench76.7%Not measuredOnly Gemini 3.5 Flash measured
Chess puzzles45.0%18.0%Gemini 3.5 Flash
Mystery game puzzles32.0%Not measuredOnly Gemini 3.5 Flash measured
EBR-bench4.8%Not measuredOnly Gemini 3.5 Flash measured
LMArena Text: hard prompts14881396Gemini 3.5 Flash
LMArena Text: expert14951384Gemini 3.5 Flash
LMArena Text: hard prompts in English14831402Gemini 3.5 Flash
LMArena Vision: diagrams13231241Gemini 3.5 Flash
LMArena Vision: homework13301241Gemini 3.5 Flash
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Gemini 3.5 Flash and Grok 4.3
BenchmarkGemini 3.5 FlashGrok 4.3Leader
OTIS Mock AIME95.6%93.3%Gemini 3.5 Flash
FrontierMath, tiers 1 to 362.8%42.8%Gemini 3.5 Flash
FrontierMath, tier 426.8%14.6%Gemini 3.5 Flash
ProofBench31.0%11.0%Gemini 3.5 Flash
LMArena Text: math15041387Gemini 3.5 Flash
LMArena Text: mathematical work14951396Gemini 3.5 Flash
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index92
Knowledge benchmarks for Gemini 3.5 Flash and Grok 4.3
BenchmarkGemini 3.5 FlashGrok 4.3Leader
MMLU Pro89.5%85.8%Gemini 3.5 Flash
LegalBench (Vals AI)83.6%84.5%Grok 4.3
CaseLaw (Vals AI)Not measured79.3%Only Grok 4.3 measured
CorpFin (Vals AI)64.7%68.5%Grok 4.3
TaxEval (Vals AI)74.4%70.8%Gemini 3.5 Flash
MortgageTax (Vals AI)68.1%48.3%Gemini 3.5 Flash
MedCode (Vals AI)55.8%38.1%Gemini 3.5 Flash
SimpleQA Verified66.2%33.2%Gemini 3.5 Flash
LMArena Text: science14951399Gemini 3.5 Flash
LMArena Text: medicine and healthcare14831384Gemini 3.5 Flash
LMArena Text: legal and government14881386Gemini 3.5 Flash
LMArena Text: business and finance14671381Gemini 3.5 Flash
FACTS Benchmark Suite63.1%Not measuredOnly Gemini 3.5 Flash 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 Gemini 3.5 Flash and Grok 4.3
BenchmarkGemini 3.5 FlashGrok 4.3Leader
Design Arena: websites12671196Gemini 3.5 Flash
Design Arena: UI components12691190Gemini 3.5 Flash
Design Arena: game dev12631173Gemini 3.5 Flash
Design Arena: data viz12361179Gemini 3.5 Flash
Design Arena: 3D12431124Gemini 3.5 Flash
Design Arena: all code categories12661186Gemini 3.5 Flash
Design Arena: SVG12531080Gemini 3.5 Flash
Design Arena: ASCII art12541125Gemini 3.5 Flash
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index292
General benchmarks for Gemini 3.5 Flash and Grok 4.3
BenchmarkGemini 3.5 FlashGrok 4.3Leader
Public Benefits Bench (Vals AI)59.5%51.7%Gemini 3.5 Flash
SAGE (Vals AI)49.9%19.7%Gemini 3.5 Flash
MedScribe (Vals AI)76.6%74.4%Gemini 3.5 Flash
Vals Multimodal Index62.9%43.3%Gemini 3.5 Flash
IFBench76.3%83.3%Grok 4.3
Long context reasoning (AA-LCR)74.3%75.0%Grok 4.3
DTBench94.7%90.7%Gemini 3.5 Flash
LMCA47.1%38.3%Gemini 3.5 Flash
Surface Evolver Bench58.1%Not measuredOnly Gemini 3.5 Flash measured
LMArena Text14821397Gemini 3.5 Flash
LMArena Text: instruction following14671366Gemini 3.5 Flash
LMArena Text: creative writing14701380Gemini 3.5 Flash
LMArena Vision13081229Gemini 3.5 Flash
LMArena Text: English14811404Gemini 3.5 Flash
LMArena Text: non-English14751385Gemini 3.5 Flash
LMArena Text: Chinese15271422Gemini 3.5 Flash
LMArena Text: German14941395Gemini 3.5 Flash
LMArena Text: Japanese14861379Gemini 3.5 Flash
LMArena Text: Korean14481354Gemini 3.5 Flash
LMArena Text: French14901411Gemini 3.5 Flash
LMArena Text: Spanish14801399Gemini 3.5 Flash
LMArena Text: Russian14931399Gemini 3.5 Flash
LMArena Text: Polish15161398Gemini 3.5 Flash
LMArena Text: multi-turn14811406Gemini 3.5 Flash
LMArena Text: longer queries14831393Gemini 3.5 Flash
LMArena Text: writing and language14781385Gemini 3.5 Flash
LMArena Text: entertainment and media14591370Gemini 3.5 Flash
LMArena Vision: English13051235Gemini 3.5 Flash
LMArena Vision: Chinese13771257Gemini 3.5 Flash
LMArena Vision: reading text13171235Gemini 3.5 Flash
LMArena Vision: humor13211222Gemini 3.5 Flash
LMArena Vision: recognizing thingsNot measured1217Only Grok 4.3 measured
LMArena Vision: creative writing13011237Gemini 3.5 Flash
LMArena Document1463Not measuredOnly Gemini 3.5 Flash measured
Neither model has a result on the other 12 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Gemini 3.5 Flash and Grok 4.3
BenchmarkGemini 3.5 FlashGrok 4.3Leader
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

Gemini 3.5 Flash$0.0060Fits in one request
Grok 4.3$0.0025Fits in one request

Grok 4.3 costs less

Repository review

50K input + 3K output tokens

Gemini 3.5 Flash$0.102Fits in one request
Grok 4.3$0.070Fits in one request

Grok 4.3 costs less

Agent loop

200K input + 10K output tokens

Gemini 3.5 Flash$0.390Fits in one request
Grok 4.3$0.275Fits in one request

Grok 4.3 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 Gemini 3.5 Flash and Grok 4.3
SpecificationGoogle Gemini 3.5 FlashSpaceXAI Grok 4.3
MakerGooglexAI
WeightsNo public weights listedNo public weights listed
ReleasedMay 19, 2026April 30, 2026
Context window1.05M1M
Input $/Mtok$1.50$1.25
Output $/Mtok$9.00$2.50
Coding index39.837.4
Independent measurements behind it43
Cost per solved task$1.21$0.31
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 3.5 Flash better than Grok 4.3 for coding?

Pick Gemini 3.5 Flash for coding: it scores 39.8 on the Vibe Coding Index against 37.4 for Grok 4.3. Pick Grok 4.3 for output tokens 3.6x cheaper ($2.50 vs $9.00 per million) and a lower cost per solved task ($0.31 against $1.21).

Which is cheaper, Gemini 3.5 Flash or Grok 4.3?

Gemini 3.5 Flash costs $1.50 per million input tokens and $9.00 per million output tokens; Grok 4.3 costs $1.25 and $2.50. Per solved SWE-bench Verified task, Gemini 3.5 Flash costs $1.21 and Grok 4.3 $0.31.

Which has the bigger context window, Gemini 3.5 Flash or Grok 4.3?

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

How many benchmarks is the Gemini 3.5 Flash vs Grok 4.3 comparison based on?

99 benchmarks have a result for both models as of October 22, 2026. Gemini 3.5 Flash's coding index rests on 4 independent benchmarks and Grok 4.3's on 3. Where only one model has a result, the page says so instead of naming a winner.

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