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Gemini 2.5 Flash vs Gemini 2.5 Pro

Updated October 21, 2026. 66 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Gemini 2.5 Flash Replace Gemini 2.5 Pro
Gemini 2.5 FlashGoogle
Coding
28.7
Overall
15.5
Output $/M
$2.50
3
Gemini 2.5 ProGoogle
Coding
37.0
Overall
16.1
Output $/M
$10.00
63
vs boards won of 66 shared

Decision reading

Pick Gemini 2.5 Pro for coding: it scores 37.0 on the Vibe Coding Index against 28.7 for Gemini 2.5 Flash.

Pick Gemini 2.5 Flash when output tokens cost 4.0x less, or when a solved task costs $0.466 against $0.64.

Model AGemini 2.5 FlashGoogle28.7/1001 independent benchmark$0.466 per solved taskModel BGemini 2.5 ProGoogle37.0/1002 independent benchmarks$0.64 per solved task
Shared results
66
Gemini 2.5 Flash only
3
Gemini 2.5 Pro only
21
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
Gemini 2.5 Flash 28.7 from 1 benchmark, Gemini 2.5 Pro 37.0 from 2 benchmarks.
Widest category
Web design, 13.5 points apart on average over 6 shared benchmarks.
Widest single gap
SWE-bench Verified: Gemini 2.5 Flash 28.7% against Gemini 2.5 Pro 53.6%, 24.9 points apart on a 0 to 100 scale.
Output price
Gemini 2.5 Flash $2.50 against Gemini 2.5 Pro $10.00 per million output tokens, 4.0x apart.
Context window
Both take 1.05M tokens.

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 FlashBarsGemini 2.5 ProTies
Coding06
Intelligence02
Agentic work02
Reasoning09
Math04
Knowledge06
Web design06
General328
All shared boards363
CodingLike-for-likeFour of these boards feed the Vibe Coding Index06
Coding benchmarks for Gemini 2.5 Flash and Gemini 2.5 Pro
BenchmarkGemini 2.5 FlashGemini 2.5 ProLeader
SWE-bench Verified28.7%53.6%Gemini 2.5 Pro
LMArena WebDevNot measured1226Only Gemini 2.5 Pro measured
AA Coding IndexNot measured33.3Only Gemini 2.5 Pro measured
SWE-bench Verified (Vals AI)Not measured54.4%Only Gemini 2.5 Pro measured
Vibe Code Bench (Vals AI)Not measured0.4%Only Gemini 2.5 Pro measured
LiveCodeBench (Artificial Analysis run)69.5%80.1%Gemini 2.5 Pro
SciCodeNot measured46.3%Only Gemini 2.5 Pro measured
Terminal-Bench Hard (Artificial Analysis run)13.6%26.5%Gemini 2.5 Pro
Terminal-Bench17.1%32.6%Gemini 2.5 Pro
GSO-BenchNot measured3.9%Only Gemini 2.5 Pro measured
WeirdMLNot measured54.0%Only Gemini 2.5 Pro measured
LMArena Text: coding14231452Gemini 2.5 Pro
LMArena Text: software and IT14251459Gemini 2.5 Pro
LMArena WebDev: HTMLNot measured1235Only Gemini 2.5 Pro measured
LMArena WebDev: from an imageNot measured1285Only Gemini 2.5 Pro measured
Neither model has a result on the other 23 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Gemini 2.5 Flash and Gemini 2.5 Pro
BenchmarkGemini 2.5 FlashGemini 2.5 ProLeader
AA Intelligence Index15.516.1Gemini 2.5 Pro
Epoch Capabilities Index142.9145.1Gemini 2.5 Pro
Agentic workLike-for-likePublic boards, shown as published, kept out of the index02
Agentic work benchmarks for Gemini 2.5 Flash and Gemini 2.5 Pro
BenchmarkGemini 2.5 FlashGemini 2.5 ProLeader
AA Agentic IndexNot measured1.6Only Gemini 2.5 Pro measured
τ²-Bench Telecom31.6%54.1%Gemini 2.5 Pro
GDPvalNot measured23.3%Only Gemini 2.5 Pro measured
BALROG33.5%Not measuredOnly Gemini 2.5 Flash measured
DeepResearch BenchNot measured41.5%Only Gemini 2.5 Pro measured
Vending-Bench 2$549$574Gemini 2.5 Pro
Neither model has a result on the other 33 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index09
Reasoning benchmarks for Gemini 2.5 Flash and Gemini 2.5 Pro
BenchmarkGemini 2.5 FlashGemini 2.5 ProLeader
GPQA Diamond (Artificial Analysis run)79.0%84.4%Gemini 2.5 Pro
Humanity's Last Exam (Artificial Analysis run)12.1%22.5%Gemini 2.5 Pro
GPQA Diamond (Epoch AI run)Not measured85.3%Only Gemini 2.5 Pro measured
ARC-AGI33.3%41.0%Gemini 2.5 Pro
ARC-AGI-22.5%4.9%Gemini 2.5 Pro
SimpleBench41.2%Not measuredOnly Gemini 2.5 Flash measured
LMArena Text: hard prompts14221455Gemini 2.5 Pro
LMArena Text: expert14261452Gemini 2.5 Pro
LMArena Text: hard prompts in English14201453Gemini 2.5 Pro
LMArena Vision: diagrams12451274Gemini 2.5 Pro
LMArena Vision: homework12441281Gemini 2.5 Pro
Neither model has a result on the other 10 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index04
Math benchmarks for Gemini 2.5 Flash and Gemini 2.5 Pro
BenchmarkGemini 2.5 FlashGemini 2.5 ProLeader
AA Math Index73.387.7Gemini 2.5 Pro
AIME 2025 (Artificial Analysis run)73.3%87.7%Gemini 2.5 Pro
OTIS Mock AIMENot measured84.7%Only Gemini 2.5 Pro measured
FrontierMath, tiers 1 to 3Not measured24.6%Only Gemini 2.5 Pro measured
FrontierMath, tier 4Not measured0.0%Only Gemini 2.5 Pro measured
LMArena Text: math14111450Gemini 2.5 Pro
LMArena Text: mathematical work14221454Gemini 2.5 Pro
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index06
Knowledge benchmarks for Gemini 2.5 Flash and Gemini 2.5 Pro
BenchmarkGemini 2.5 FlashGemini 2.5 ProLeader
CaseLaw (Vals AI)Not measured63.9%Only Gemini 2.5 Pro measured
CorpFin (Vals AI)Not measured60.8%Only Gemini 2.5 Pro measured
MortgageTax (Vals AI)Not measured68.9%Only Gemini 2.5 Pro measured
MedCode (Vals AI)40.4%50.6%Gemini 2.5 Pro
MMLU Pro (Artificial Analysis run)83.2%86.2%Gemini 2.5 Pro
LMArena Text: science14331480Gemini 2.5 Pro
LMArena Text: medicine and healthcare14281476Gemini 2.5 Pro
LMArena Text: legal and government14301480Gemini 2.5 Pro
LMArena Text: business and finance14041439Gemini 2.5 Pro
Neither model has a result on the other 8 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index06
Web design benchmarks for Gemini 2.5 Flash and Gemini 2.5 Pro
BenchmarkGemini 2.5 FlashGemini 2.5 ProLeader
Design Arena: websites10741167Gemini 2.5 Pro
Design Arena: UI components10051139Gemini 2.5 Pro
Design Arena: game dev10051112Gemini 2.5 Pro
Design Arena: data viz10601222Gemini 2.5 Pro
Design Arena: 3D10211080Gemini 2.5 Pro
Design Arena: all code categories10591152Gemini 2.5 Pro
Design Arena: SVG1018Not measuredOnly Gemini 2.5 Flash measured
Neither model has a result on the other 2 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index328
General benchmarks for Gemini 2.5 Flash and Gemini 2.5 Pro
BenchmarkGemini 2.5 FlashGemini 2.5 ProLeader
SAGE (Vals AI)44.8%41.9%Gemini 2.5 Flash
MedScribe (Vals AI)83.0%73.5%Gemini 2.5 Flash
IFBench50.3%48.7%Gemini 2.5 Flash
Long context reasoning (AA-LCR)65.3%69.0%Gemini 2.5 Pro
DTBench76.5%82.4%Gemini 2.5 Pro
LMCA27.5%34.8%Gemini 2.5 Pro
Creative writing (Lech Mazur)Not measured83.8%Only Gemini 2.5 Pro measured
LMArena Text14171458Gemini 2.5 Pro
LMArena Text: instruction following14051437Gemini 2.5 Pro
LMArena Text: creative writing14001454Gemini 2.5 Pro
LMArena Vision12351263Gemini 2.5 Pro
LMArena Text: English14181458Gemini 2.5 Pro
LMArena Text: non-English14091452Gemini 2.5 Pro
LMArena Text: Chinese14491507Gemini 2.5 Pro
LMArena Text: German14171487Gemini 2.5 Pro
LMArena Text: Japanese13961461Gemini 2.5 Pro
LMArena Text: Korean13851434Gemini 2.5 Pro
LMArena Text: French14321473Gemini 2.5 Pro
LMArena Text: Spanish14221474Gemini 2.5 Pro
LMArena Text: Russian14151461Gemini 2.5 Pro
LMArena Text: Polish14131479Gemini 2.5 Pro
LMArena Text: multi-turn14081453Gemini 2.5 Pro
LMArena Text: longer queries14191449Gemini 2.5 Pro
LMArena Text: writing and language14051454Gemini 2.5 Pro
LMArena Text: entertainment and media13931441Gemini 2.5 Pro
LMArena Vision: English12391261Gemini 2.5 Pro
LMArena Vision: Chinese12841300Gemini 2.5 Pro
LMArena Vision: reading text12371270Gemini 2.5 Pro
LMArena Vision: humor12251262Gemini 2.5 Pro
LMArena Vision: captioning12771304Gemini 2.5 Pro
LMArena Vision: recognizing things12521283Gemini 2.5 Pro
LMArena Vision: creative writing12411265Gemini 2.5 Pro
LMArena DocumentNot measured1421Only Gemini 2.5 Pro measured
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 Gemini 2.5 Pro
BenchmarkGemini 2.5 FlashGemini 2.5 ProLeader
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
Gemini 2.5 Pro$0.0063Fits 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
Gemini 2.5 Pro$0.092Fits 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
Gemini 2.5 Pro$0.350Fits 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 Gemini 2.5 Pro
SpecificationGoogle Gemini 2.5 FlashGoogle Gemini 2.5 Pro
MakerGoogleGoogle
WeightsNo public weights listedNo public weights listed
ReleasedJune 17, 2025June 17, 2025
Context window1.05M1.05M
Input $/Mtok$0.30$1.25
Output $/Mtok$2.50$10.00
Coding index28.737.0
Independent measurements behind it12
Cost per solved task$0.466$0.64
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 2.5 Flash better than Gemini 2.5 Pro for coding?

Pick Gemini 2.5 Pro for coding: it scores 37.0 on the Vibe Coding Index against 28.7 for Gemini 2.5 Flash. Pick Gemini 2.5 Flash when output tokens cost 4.0x less, or when a solved task costs $0.466 against $0.64.

Which is cheaper, Gemini 2.5 Flash or Gemini 2.5 Pro?

Gemini 2.5 Flash costs $0.30 per million input tokens and $2.50 per million output tokens; Gemini 2.5 Pro costs $1.25 and $10.00. Per solved SWE-bench Verified task, Gemini 2.5 Flash costs $0.466 and Gemini 2.5 Pro $0.64.

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

Neither: both take 1.05M tokens.

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

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

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