Enter opens the highlighted result. Esc closes.

Gemini 2.5 Flash vs o3 Mini

Gemini 2.5 Flash leads o3 Mini on the Artificial Analysis Intelligence Index, 15.5 to 12.5, and Gemini 2.5 Flash costs 1.8x less per output token ($2.50 vs $4.40 per million). Updated October 21, 2026; 44 benchmarks have a result for both.

Replace Gemini 2.5 Flash Replace o3 Mini
Gemini 2.5 FlashGoogle
Coding
No data
Overall
34.3
Output $/M
$2.50
39
o3 MiniOpenAI
Coding
No data
Overall
38.0
Output $/M
$4.40
5
vs boards won of 44 shared

Gemini 2.5 Flash or o3 Mini: which to pick

Neither model has a coding score yet, so the two cannot be ranked on coding.

Pick Gemini 2.5 Flash for output tokens 1.8x cheaper ($2.50 vs $4.40 per million) and a larger context window (1.05M against 200K tokens).

Model AGemini 2.5 FlashGoogleNot benchmarkedNo coding benchmark$0.466 per solved taskModel Bo3 MiniOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
44
Gemini 2.5 Flash only
29
o3 Mini only
27
Like-for-like categories
7 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, o3 Mini not benchmarked.
Widest category
General, 15.2 points apart on average over 21 shared benchmarks.
Widest single gap
Long context reasoning (AA-LCR): Gemini 2.5 Flash 65.3% against o3 Mini 43.0%, 22.3 points apart on a 0 to 100 scale.
Output price
Gemini 2.5 Flash $2.50 against o3 Mini $4.40 per million output tokens, 1.8x apart.
Context window
Gemini 2.5 Flash takes 1.05M tokens, o3 Mini 200K.

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 FlashBarso3 MiniTies
Coding32
Intelligence20
Agentic work10
Reasoning62
Math20
Knowledge50
General201
All shared boards395
CodingLike-for-likeSix of these boards feed the Vibe Coding Index32
Coding benchmarks for Gemini 2.5 Flash and o3 Mini
BenchmarkGemini 2.5 Flasho3 MiniLeader
Aider polyglotNot measured60.4%Only o3 Mini measured
SWE-bench Verified28.7%42.4%o3 Mini
SWE-bench LiteNot measured32.3%Only o3 Mini measured
LiveCodeBench (Vals AI)Not measured71.5%Only o3 Mini measured
LiveCodeBench (Artificial Analysis run)69.5%73.4%o3 Mini
SciCodeNot measured42.8%Only o3 Mini measured
Terminal-Bench Hard (Artificial Analysis run)13.6%6.8%Gemini 2.5 Flash
Terminal-Bench17.1%Not measuredOnly Gemini 2.5 Flash measured
GSO-BenchNot measured1.3%Only o3 Mini measured
WeirdMLNot measured43.7%Only o3 Mini measured
CybenchNot measured22.5%Only o3 Mini measured
LMArena Text: coding14231378Gemini 2.5 Flash
LMArena Text: software and IT14251364Gemini 2.5 Flash
SciCodeNot measured7.7%Only o3 Mini measured
Neither model has a result on the other 25 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Gemini 2.5 Flash and o3 Mini
BenchmarkGemini 2.5 Flasho3 MiniLeader
AA Intelligence Index15.512.5Gemini 2.5 Flash
Epoch Capabilities Index142.9140.2Gemini 2.5 Flash
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for Gemini 2.5 Flash and o3 Mini
BenchmarkGemini 2.5 Flasho3 MiniLeader
τ²-Bench Telecom31.6%31.3%Gemini 2.5 Flash
BALROG33.5%Not measuredOnly Gemini 2.5 Flash measured
Vending-Bench 2$549Not measuredOnly Gemini 2.5 Flash 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 36 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index62
Reasoning benchmarks for Gemini 2.5 Flash and o3 Mini
BenchmarkGemini 2.5 Flasho3 MiniLeader
GPQA DiamondNot measured75.5%Only o3 Mini measured
GPQA Diamond (Artificial Analysis run)79.0%77.3%Gemini 2.5 Flash
Humanity's Last Exam (Artificial Analysis run)12.1%12.0%Gemini 2.5 Flash
GPQA Diamond (Epoch AI run)Not measured77.0%Only o3 Mini measured
ARC-AGI33.3%34.5%o3 Mini
ARC-AGI-22.5%3.0%o3 Mini
SimpleBench41.2%22.8%Gemini 2.5 Flash
Chess puzzlesNot measured15.0%Only o3 Mini measured
Mystery game puzzlesNot measured7.0%Only o3 Mini measured
LMArena Text: hard prompts14221365Gemini 2.5 Flash
LMArena Text: expert14261364Gemini 2.5 Flash
LMArena Text: hard prompts in English14201375Gemini 2.5 Flash
LMArena Vision: diagrams1245Not measuredOnly Gemini 2.5 Flash measured
LMArena Vision: homework1244Not measuredOnly Gemini 2.5 Flash measured
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 o3 Mini
BenchmarkGemini 2.5 Flasho3 MiniLeader
AIMENot measured86.5%Only o3 Mini measured
MATH 500 (Vals AI)Not measured91.8%Only o3 Mini measured
MGSM (Vals AI)Not measured91.3%Only o3 Mini measured
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 measured76.9%Only o3 Mini measured
FrontierMath, tiers 1 to 3Not measured18.6%Only o3 Mini measured
FrontierMath, tier 4Not measured0.0%Only o3 Mini measured
MATH level 5Not measured96.5%Only o3 Mini measured
LMArena Text: math14111396Gemini 2.5 Flash
LMArena Text: mathematical work14221399Gemini 2.5 Flash
Neither model has a result on the other 2 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index50
Knowledge benchmarks for Gemini 2.5 Flash and o3 Mini
BenchmarkGemini 2.5 Flasho3 MiniLeader
MMLU ProNot measured78.7%Only o3 Mini measured
LegalBench (Vals AI)Not measured71.5%Only o3 Mini measured
CorpFin (Vals AI)Not measured45.3%Only o3 Mini measured
TaxEval (Vals AI)Not measured69.4%Only o3 Mini measured
MedQA (Vals AI)Not measured94.8%Only o3 Mini measured
MedCode (Vals AI)40.4%Not measuredOnly Gemini 2.5 Flash measured
MMLU Pro (Artificial Analysis run)83.2%80.2%Gemini 2.5 Flash
SimpleQA VerifiedNot measured15.3%Only o3 Mini measured
LMArena Text: science14331339Gemini 2.5 Flash
LMArena Text: medicine and healthcare14281330Gemini 2.5 Flash
LMArena Text: legal and government14301328Gemini 2.5 Flash
LMArena Text: business and finance14041313Gemini 2.5 Flash
FACTS Benchmark Suite47.2%Not measuredOnly Gemini 2.5 Flash measured
Neither model has a result on the other 5 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index7 boards, none shared
Web design benchmarks for Gemini 2.5 Flash and o3 Mini
BenchmarkGemini 2.5 Flasho3 MiniLeader
Design Arena: websites1074Not measuredOnly Gemini 2.5 Flash measured
Design Arena: UI components1005Not measuredOnly Gemini 2.5 Flash measured
Design Arena: game dev1005Not measuredOnly Gemini 2.5 Flash measured
Design Arena: data viz1060Not measuredOnly Gemini 2.5 Flash measured
Design Arena: 3D1021Not measuredOnly Gemini 2.5 Flash measured
Design Arena: all code categories1059Not measuredOnly Gemini 2.5 Flash measured
Design Arena: SVG1020Not 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 index201
General benchmarks for Gemini 2.5 Flash and o3 Mini
BenchmarkGemini 2.5 Flasho3 MiniLeader
SAGE (Vals AI)44.8%Not measuredOnly Gemini 2.5 Flash measured
MedScribe (Vals AI)83.0%Not measuredOnly Gemini 2.5 Flash measured
IFBench50.3%67.1%o3 Mini
Long context reasoning (AA-LCR)65.3%43.0%Gemini 2.5 Flash
DTBench76.5%68.8%Gemini 2.5 Flash
LMCA27.5%19.0%Gemini 2.5 Flash
Fiction.LiveBenchNot measured50.0%Only o3 Mini measured
Creative writing (Lech Mazur)Not measured61.7%Only o3 Mini measured
LMArena Text14171337Gemini 2.5 Flash
LMArena Text: instruction following14051337Gemini 2.5 Flash
LMArena Text: creative writing14001286Gemini 2.5 Flash
LMArena Vision1235Not measuredOnly Gemini 2.5 Flash measured
LMArena Text: English14181351Gemini 2.5 Flash
LMArena Text: non-English14091319Gemini 2.5 Flash
LMArena Text: Chinese14491379Gemini 2.5 Flash
LMArena Text: German14171303Gemini 2.5 Flash
LMArena Text: Japanese13961286Gemini 2.5 Flash
LMArena Text: Korean13851313Gemini 2.5 Flash
LMArena Text: French14321334Gemini 2.5 Flash
LMArena Text: Spanish14221321Gemini 2.5 Flash
LMArena Text: Russian14151304Gemini 2.5 Flash
LMArena Text: Polish14131294Gemini 2.5 Flash
LMArena Text: multi-turn14081320Gemini 2.5 Flash
LMArena Text: longer queries14191343Gemini 2.5 Flash
LMArena Text: writing and language14051313Gemini 2.5 Flash
LMArena Text: entertainment and media13931283Gemini 2.5 Flash
LMArena Vision: English1239Not measuredOnly Gemini 2.5 Flash measured
LMArena Vision: Chinese1284Not measuredOnly Gemini 2.5 Flash measured
LMArena Vision: reading text1237Not measuredOnly Gemini 2.5 Flash measured
LMArena Vision: humor1225Not measuredOnly Gemini 2.5 Flash measured
LMArena Vision: captioning1277Not measuredOnly Gemini 2.5 Flash measured
LMArena Vision: recognizing things1252Not measuredOnly Gemini 2.5 Flash measured
LMArena Vision: creative writing1241Not measuredOnly Gemini 2.5 Flash 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 o3 Mini
BenchmarkGemini 2.5 Flasho3 MiniLeader
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
o3 Mini$0.0033Fits 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
o3 Mini$0.068Fits 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
o3 Mini$0.264Exceeds the context window

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 o3 Mini
SpecificationGoogle Gemini 2.5 FlashOpenAI o3 Mini
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJune 17, 2025January 31, 2025
Context window1.05M200K
Input $/Mtok$0.30$1.10
Output $/Mtok$2.50$4.40
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved task$0.466Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 2.5 Flash better than o3 Mini for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick Gemini 2.5 Flash for output tokens 1.8x cheaper ($2.50 vs $4.40 per million) and a larger context window (1.05M against 200K tokens).

Which is cheaper, Gemini 2.5 Flash or o3 Mini?

Gemini 2.5 Flash costs $0.30 per million input tokens and $2.50 per million output tokens; o3 Mini costs $1.10 and $4.40. Cost per solved task is known for Gemini 2.5 Flash only.

Which has the bigger context window, Gemini 2.5 Flash or o3 Mini?

Gemini 2.5 Flash, with 1.05M tokens against 200K.

How many benchmarks is the Gemini 2.5 Flash vs o3 Mini comparison based on?

44 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 o3 Mini's on 0. Where only one model has a result, the page says so instead of naming a winner.

Compare next