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Gemini 2.5 Flash vs Grok 4.3

Grok 4.3 leads Gemini 2.5 Flash on the Artificial Analysis Intelligence Index, 24.9 to 15.5, at about the same output price ($2.50 vs $2.50 per million). Updated October 21, 2026; 57 benchmarks have a result for both.

Replace Gemini 2.5 Flash Replace Grok 4.3
Gemini 2.5 FlashGoogle
Coding
No data
Overall
34.3
Output $/M
$2.50
41
Grok 4.3xAI
Coding
37.4
Overall
53.1
Output $/M
$2.50
16
vs boards won of 57 shared

Gemini 2.5 Flash or Grok 4.3: which to pick

Only Grok 4.3 has a coding score, 37.4 on the Vibe Coding Index; Gemini 2.5 Flash has none, so the two cannot be ranked on coding.

Pick Gemini 2.5 Flash for a larger context window (1.05M against 1M tokens) and work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.

Model AGemini 2.5 FlashGoogleNot benchmarkedNo coding benchmark$0.466 per solved taskModel BGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved task
Shared results
57
Gemini 2.5 Flash only
16
Grok 4.3 only
47
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 2.5 Flash not benchmarked, Grok 4.3 37.4 from 3 benchmarks.
Widest category
Agentic work, 34.6 points apart on average over 2 shared benchmarks.
Widest single gap
τ²-Bench Telecom: Gemini 2.5 Flash 31.6% against Grok 4.3 97.7%, 66.1 points apart on a 0 to 100 scale.
Output price
Both cost $2.50 per million output tokens.
Context window
Gemini 2.5 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 2.5 FlashBarsGrok 4.3Ties
Coding21
Intelligence01
Agentic work11
Reasoning52
Math20
Knowledge50
Web design07
General264
All shared boards4116
CodingLike-for-likeSix of these boards feed the Vibe Coding Index21
Coding benchmarks for Gemini 2.5 Flash and Grok 4.3
BenchmarkGemini 2.5 FlashGrok 4.3Leader
SWE-bench Verified28.7%Not measuredOnly Gemini 2.5 Flash measured
LMArena WebDevNot measured1358Only Grok 4.3 measured
AA Coding IndexNot measured42.2Only Grok 4.3 measured
LiveCodeBench (Vals AI)Not measured84.5%Only Grok 4.3 measured
SWE-bench Verified (Vals AI)Not measured71.4%Only Grok 4.3 measured
Vibe Code Bench (Vals AI)Not measured19.4%Only Grok 4.3 measured
Code migration (Vals AI)Not measured6.8%Only Grok 4.3 measured
ProgramBench (Vals AI)Not measured0.0%Only Grok 4.3 measured
Terminal-Bench 2.1 (Vals AI)Not measured42.0%Only Grok 4.3 measured
SkillsBench (Vals AI)Not measured40.6%Only Grok 4.3 measured
LiveCodeBench (Artificial Analysis run)69.5%Not measuredOnly Gemini 2.5 Flash measured
SciCodeNot measured48.3%Only Grok 4.3 measured
Terminal-Bench Hard (Artificial Analysis run)13.6%37.9%Grok 4.3
Terminal-Bench17.1%Not measuredOnly Gemini 2.5 Flash measured
WeirdMLNot measured49.9%Only Grok 4.3 measured
ALE-BenchNot measured944.2Only Grok 4.3 measured
LMArena Text: coding14231415Gemini 2.5 Flash
LMArena Text: software and IT14251416Gemini 2.5 Flash
LMArena WebDev: ReactNot measured1353Only Grok 4.3 measured
LMArena WebDev: HTMLNot measured1367Only Grok 4.3 measured
LMArena WebDev: from an imageNot measured1375Only Grok 4.3 measured
Neither model has a result on the other 18 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Gemini 2.5 Flash and Grok 4.3
BenchmarkGemini 2.5 FlashGrok 4.3Leader
AA Intelligence Index15.524.9Grok 4.3
Epoch Capabilities Index142.9Not measuredOnly Gemini 2.5 Flash measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index11
Agentic work benchmarks for Gemini 2.5 Flash and Grok 4.3
BenchmarkGemini 2.5 FlashGrok 4.3Leader
AA Agentic IndexNot measured15.5Only Grok 4.3 measured
Design Arena: agents building web appsNot measured1126Only Grok 4.3 measured
Design Arena: agents building full-stack appsNot measured1006Only Grok 4.3 measured
Design Arena: agents building mobile appsNot measured1059Only Grok 4.3 measured
Design Arena: agents building Android appsNot measured961Only Grok 4.3 measured
Design Arena: agents building Godot gamesNot measured914Only Grok 4.3 measured
Design Arena: agents building gamesNot measured1007Only Grok 4.3 measured
Design Arena: HTML slidesNot measured1008Only Grok 4.3 measured
Design Arena: PowerPoint slidesNot measured1013Only Grok 4.3 measured
Finance Agent (Vals AI)Not measured37.7%Only Grok 4.3 measured
Tax Agent Bench (Vals AI)Not measured6.2%Only Grok 4.3 measured
Legal Research Bench (Vals AI)Not measured15.4%Only Grok 4.3 measured
Excel Modeling Benchmark (Vals AI)Not measured18.4%Only Grok 4.3 measured
τ²-Bench Telecom31.6%97.7%Grok 4.3
BALROG33.5%Not measuredOnly Gemini 2.5 Flash measured
Vending-Bench 2$549$35Gemini 2.5 Flash
LMArena SearchNot measured1166Only Grok 4.3 measured
Berkeley Function Calling Leaderboard (BFCL)56.2%Not measuredOnly Gemini 2.5 Flash measured
BrowseComp-Plus39.9%Not measuredOnly Gemini 2.5 Flash measured
Neither model has a result on the other 22 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index52
Reasoning benchmarks for Gemini 2.5 Flash and Grok 4.3
BenchmarkGemini 2.5 FlashGrok 4.3Leader
GPQA DiamondNot measured91.4%Only Grok 4.3 measured
MMMU Pro (Vals AI)Not measured83.1%Only Grok 4.3 measured
GPQA Diamond (Artificial Analysis run)79.0%90.1%Grok 4.3
Humanity's Last Exam (Artificial Analysis run)12.1%37.2%Grok 4.3
GPQA Diamond (Epoch AI run)Not measured88.8%Only Grok 4.3 measured
ARC-AGI33.3%Not measuredOnly Gemini 2.5 Flash measured
ARC-AGI-22.5%Not measuredOnly Gemini 2.5 Flash measured
SimpleBench41.2%Not measuredOnly Gemini 2.5 Flash measured
Chess puzzlesNot measured18.0%Only Grok 4.3 measured
LMArena Text: hard prompts14221396Gemini 2.5 Flash
LMArena Text: expert14261384Gemini 2.5 Flash
LMArena Text: hard prompts in English14201402Gemini 2.5 Flash
LMArena Vision: diagrams12451241Gemini 2.5 Flash
LMArena Vision: homework12441241Gemini 2.5 Flash
Kagi LLM Benchmark56.8%Not measuredOnly Gemini 2.5 Flash measured
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for Gemini 2.5 Flash and Grok 4.3
BenchmarkGemini 2.5 FlashGrok 4.3Leader
AA Math Index73.3Not measuredOnly Gemini 2.5 Flash measured
AIME 2025 (Artificial Analysis run)73.3%Not measuredOnly Gemini 2.5 Flash measured
OTIS Mock AIMENot measured93.3%Only Grok 4.3 measured
FrontierMath, tiers 1 to 3Not measured42.8%Only Grok 4.3 measured
FrontierMath, tier 4Not measured14.6%Only Grok 4.3 measured
ProofBenchNot measured11.0%Only Grok 4.3 measured
LMArena Text: math14111387Gemini 2.5 Flash
LMArena Text: mathematical work14221396Gemini 2.5 Flash
Neither model has a result on the other 5 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index50
Knowledge benchmarks for Gemini 2.5 Flash and Grok 4.3
BenchmarkGemini 2.5 FlashGrok 4.3Leader
MMLU ProNot measured85.8%Only Grok 4.3 measured
LegalBench (Vals AI)Not measured84.5%Only Grok 4.3 measured
CaseLaw (Vals AI)Not measured79.3%Only Grok 4.3 measured
CorpFin (Vals AI)Not measured68.5%Only Grok 4.3 measured
TaxEval (Vals AI)Not measured70.8%Only Grok 4.3 measured
MortgageTax (Vals AI)Not measured48.3%Only Grok 4.3 measured
MedCode (Vals AI)40.4%38.1%Gemini 2.5 Flash
MMLU Pro (Artificial Analysis run)83.2%Not measuredOnly Gemini 2.5 Flash measured
SimpleQA VerifiedNot measured33.2%Only Grok 4.3 measured
LMArena Text: science14331399Gemini 2.5 Flash
LMArena Text: medicine and healthcare14281384Gemini 2.5 Flash
LMArena Text: legal and government14301386Gemini 2.5 Flash
LMArena Text: business and finance14041381Gemini 2.5 Flash
FACTS Benchmark Suite47.2%Not measuredOnly Gemini 2.5 Flash measured
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index07
Web design benchmarks for Gemini 2.5 Flash and Grok 4.3
BenchmarkGemini 2.5 FlashGrok 4.3Leader
Design Arena: websites10741196Grok 4.3
Design Arena: UI components10051192Grok 4.3
Design Arena: game dev10051174Grok 4.3
Design Arena: data viz10601179Grok 4.3
Design Arena: 3D10211125Grok 4.3
Design Arena: all code categories10591187Grok 4.3
Design Arena: SVG10201081Grok 4.3
Design Arena: ASCII artNot measured1125Only Grok 4.3 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index264
General benchmarks for Gemini 2.5 Flash and Grok 4.3
BenchmarkGemini 2.5 FlashGrok 4.3Leader
Public Benefits Bench (Vals AI)Not measured51.7%Only Grok 4.3 measured
SAGE (Vals AI)44.8%19.7%Gemini 2.5 Flash
MedScribe (Vals AI)83.0%74.4%Gemini 2.5 Flash
Vals Multimodal IndexNot measured43.3%Only Grok 4.3 measured
IFBench50.3%83.3%Grok 4.3
Long context reasoning (AA-LCR)65.3%75.0%Grok 4.3
DTBench76.5%90.7%Grok 4.3
LMCA27.5%38.3%Grok 4.3
LMArena Text14171397Gemini 2.5 Flash
LMArena Text: instruction following14051366Gemini 2.5 Flash
LMArena Text: creative writing14001380Gemini 2.5 Flash
LMArena Vision12351229Gemini 2.5 Flash
LMArena Text: English14181404Gemini 2.5 Flash
LMArena Text: non-English14091385Gemini 2.5 Flash
LMArena Text: Chinese14491422Gemini 2.5 Flash
LMArena Text: German14171395Gemini 2.5 Flash
LMArena Text: Japanese13961379Gemini 2.5 Flash
LMArena Text: Korean13851354Gemini 2.5 Flash
LMArena Text: French14321411Gemini 2.5 Flash
LMArena Text: Spanish14221399Gemini 2.5 Flash
LMArena Text: Russian14151399Gemini 2.5 Flash
LMArena Text: Polish14131398Gemini 2.5 Flash
LMArena Text: multi-turn14081406Gemini 2.5 Flash
LMArena Text: longer queries14191393Gemini 2.5 Flash
LMArena Text: writing and language14051385Gemini 2.5 Flash
LMArena Text: entertainment and media13931370Gemini 2.5 Flash
LMArena Vision: English12391235Gemini 2.5 Flash
LMArena Vision: Chinese12841257Gemini 2.5 Flash
LMArena Vision: reading text12371235Gemini 2.5 Flash
LMArena Vision: humor12251222Gemini 2.5 Flash
LMArena Vision: captioning1277Not measuredOnly Gemini 2.5 Flash measured
LMArena Vision: recognizing things12521217Gemini 2.5 Flash
LMArena Vision: creative writing12411237Gemini 2.5 Flash
Neither model has a result on the other 13 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Gemini 2.5 Flash and Grok 4.3
BenchmarkGemini 2.5 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 2.5 Flash$0.0015Fits in one request
Grok 4.3$0.0025Fits in one request

Gemini 2.5 Flash costs less

Repository review

50K input + 3K output tokens

Gemini 2.5 Flash$0.022Fits in one request
Grok 4.3$0.070Fits in one request

Gemini 2.5 Flash costs less

Agent loop

200K input + 10K output tokens

Gemini 2.5 Flash$0.085Fits in one request
Grok 4.3$0.275Fits 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 Gemini 2.5 Flash and Grok 4.3
SpecificationGoogle Gemini 2.5 FlashSpaceXAI Grok 4.3
MakerGooglexAI
WeightsNo public weights listedNo public weights listed
ReleasedJune 17, 2025April 30, 2026
Context window1.05M1M
Input $/Mtok$0.30$1.25
Output $/Mtok$2.50$2.50
Coding indexNot benchmarked37.4
Independent measurements behind it03
Cost per solved task$0.466$0.31
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 2.5 Flash better than Grok 4.3 for coding?

Only Grok 4.3 has a coding score, 37.4 on the Vibe Coding Index; Gemini 2.5 Flash has none, so the two cannot be ranked on coding. Pick Gemini 2.5 Flash for a larger context window (1.05M against 1M tokens) and work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.

Which is cheaper, Gemini 2.5 Flash or Grok 4.3?

Gemini 2.5 Flash costs $0.30 per million input tokens and $2.50 per million output tokens; Grok 4.3 costs $1.25 and $2.50. Per solved SWE-bench Verified task, Gemini 2.5 Flash costs $0.466 and Grok 4.3 $0.31.

Which has the bigger context window, Gemini 2.5 Flash or Grok 4.3?

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

How many benchmarks is the Gemini 2.5 Flash vs Grok 4.3 comparison based on?

57 benchmarks have a result for both models as of October 21, 2026. Gemini 2.5 Flash's coding index rests on 0 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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