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Gemini 3.6 Flash vs o3

Gemini 3.6 Flash leads o3 on the Artificial Analysis Intelligence Index, 34.0 to 20.2, and Gemini 3.6 Flash costs 2.1x less per output token ($3.75 vs $8.00 per million). Updated October 22, 2026; 71 benchmarks have a result for both.

Replace Gemini 3.6 Flash Replace o3
Gemini 3.6 FlashGoogle
Coding
62.5
Overall
68.3
Output $/M
$3.75
70
o3OpenAI
Coding
No data
Overall
51.1
Output $/M
$8.00
1
vs boards won of 71 shared

Gemini 3.6 Flash or o3: which to pick

Only Gemini 3.6 Flash has a coding score, 62.5 on the Vibe Coding Index; o3 has none, so the two cannot be ranked on coding.

Pick o3 for a lower cost per solved task ($0.571 against $1.49) and work measured by ALE-Bench, where it leads.

Model AGemini 3.6 FlashGoogle62.5/1004 independent benchmarks$1.49 per solved taskModel Bo3OpenAINot benchmarkedNo coding benchmark$0.571 per solved task
Shared results
71
Gemini 3.6 Flash only
38
o3 only
31
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 3.6 Flash 62.5 from 4 benchmarks, o3 not benchmarked.
Widest category
Web design, 28.2 points apart on average over 5 shared benchmarks.
Widest single gap
ARC-AGI-2: Gemini 3.6 Flash 60.4% against o3 6.5%, 53.9 points apart on a 0 to 100 scale.
Output price
Gemini 3.6 Flash $3.75 against o3 $8.00 per million output tokens, 2.1x apart.
Context window
Gemini 3.6 Flash takes 1.05M tokens, o3 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 3.6 FlashBarso3Ties
Coding51
Intelligence20
Reasoning140
Math40
Knowledge120
Web design50
General280
All shared boards701
CodingLike-for-likeSix of these boards feed the Vibe Coding Index51
Coding benchmarks for Gemini 3.6 Flash and o3
BenchmarkGemini 3.6 Flasho3Leader
Aider polyglotNot measured81.3%Only o3 measured
SWE-bench VerifiedNot measured58.4%Only o3 measured
SWE-bench MultimodalNot measured36.0%Only o3 measured
LMArena WebDev1538Not measuredOnly Gemini 3.6 Flash measured
AA Coding Index69.2Not measuredOnly Gemini 3.6 Flash measured
LiveCodeBench (Vals AI)88.1%83.9%Gemini 3.6 Flash
SWE-bench Verified (Vals AI)79.6%Not measuredOnly Gemini 3.6 Flash measured
Vibe Code Bench (Vals AI)64.0%Not measuredOnly Gemini 3.6 Flash measured
Code migration (Vals AI)30.9%Not measuredOnly Gemini 3.6 Flash measured
ProgramBench (Vals AI)0.0%Not measuredOnly Gemini 3.6 Flash measured
IOI (Vals AI)35.1%Not measuredOnly Gemini 3.6 Flash measured
Terminal-Bench 2.1 (Vals AI)73.8%Not measuredOnly Gemini 3.6 Flash measured
CyberBench (Vals AI)45.4%Not measuredOnly Gemini 3.6 Flash measured
LiveCodeBench (Artificial Analysis run)Not measured80.8%Only o3 measured
SciCode53.4%Not measuredOnly Gemini 3.6 Flash measured
Terminal-Bench Hard (Artificial Analysis run)Not measured37.1%Only o3 measured
FrontierCode34.4%Not measuredOnly Gemini 3.6 Flash measured
GSO-BenchNot measured8.8%Only o3 measured
WeirdML56.1%52.4%Gemini 3.6 Flash
ALE-Bench715.5933.5o3
LMArena Text: coding14911407Gemini 3.6 Flash
LMArena Text: software and IT14921415Gemini 3.6 Flash
LMArena WebDev: React1528Not measuredOnly Gemini 3.6 Flash measured
LMArena WebDev: HTML1547Not measuredOnly Gemini 3.6 Flash measured
LMArena WebDev: from an image1545Not measuredOnly Gemini 3.6 Flash measured
SciCode10.8%9.2%Gemini 3.6 Flash
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Gemini 3.6 Flash and o3
BenchmarkGemini 3.6 Flasho3Leader
AA Intelligence Index34.020.2Gemini 3.6 Flash
Epoch Capabilities Index154.5146.7Gemini 3.6 Flash
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index23 boards, none shared
Agentic work benchmarks for Gemini 3.6 Flash and o3
BenchmarkGemini 3.6 Flasho3Leader
AA Agentic Index29.0Not measuredOnly Gemini 3.6 Flash measured
Design Arena: agents building web apps1197Not measuredOnly Gemini 3.6 Flash measured
Design Arena: agents building full-stack apps1181Not measuredOnly Gemini 3.6 Flash measured
Design Arena: agents building mobile apps1198Not measuredOnly Gemini 3.6 Flash measured
Design Arena: agents building Android apps1204Not measuredOnly Gemini 3.6 Flash measured
Design Arena: agents building games1180Not measuredOnly Gemini 3.6 Flash measured
Design Arena: HTML slides1099Not measuredOnly Gemini 3.6 Flash measured
Design Arena: PowerPoint slides1121Not measuredOnly Gemini 3.6 Flash measured
Design Arena: spreadsheets1071Not measuredOnly Gemini 3.6 Flash measured
Finance Agent (Vals AI)56.3%Not measuredOnly Gemini 3.6 Flash measured
Tax Agent Bench (Vals AI)18.0%Not measuredOnly Gemini 3.6 Flash measured
Legal Research Bench (Vals AI)25.0%Not measuredOnly Gemini 3.6 Flash measured
Excel Modeling Benchmark (Vals AI)65.4%Not measuredOnly Gemini 3.6 Flash measured
BioMysteryBench (Vals AI)58.5%Not measuredOnly Gemini 3.6 Flash measured
Terminal-Bench-Science (Vals AI)4.3%Not measuredOnly Gemini 3.6 Flash measured
τ²-Bench TelecomNot measured80.7%Only o3 measured
APEX-Agents46.9%Not measuredOnly Gemini 3.6 Flash measured
METR time horizonsNot measured65.4%Only o3 measured
GDPvalNot measured30.8%Only o3 measured
DeepResearch BenchNot measured45.2%Only o3 measured
OSWorldNot measured23.0%Only o3 measured
Berkeley Function Calling Leaderboard (BFCL)Not measured63.0%Only o3 measured
BrowseComp-PlusNot measured65.9%Only o3 measured
Neither model has a result on the other 18 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index140
Reasoning benchmarks for Gemini 3.6 Flash and o3
BenchmarkGemini 3.6 Flasho3Leader
GPQA Diamond93.4%84.1%Gemini 3.6 Flash
MMMU Pro (Vals AI)88.4%80.4%Gemini 3.6 Flash
GPQA Diamond (Artificial Analysis run)92.8%82.7%Gemini 3.6 Flash
Humanity's Last Exam (Artificial Analysis run)40.8%20.1%Gemini 3.6 Flash
GPQA Diamond (Epoch AI run)94.1%81.8%Gemini 3.6 Flash
ARC-AGI91.2%60.8%Gemini 3.6 Flash
ARC-AGI-260.4%6.5%Gemini 3.6 Flash
SimpleBenchNot measured53.1%Only o3 measured
Chess puzzles42.0%37.0%Gemini 3.6 Flash
Mystery game puzzles30.0%29.0%Gemini 3.6 Flash
VPCTNot measured52.0%Only o3 measured
LMArena Text: hard prompts14861402Gemini 3.6 Flash
LMArena Text: expert14901402Gemini 3.6 Flash
LMArena Text: hard prompts in English14841411Gemini 3.6 Flash
LMArena Vision: diagrams13141220Gemini 3.6 Flash
LMArena Vision: homework13141234Gemini 3.6 Flash
Kagi LLM BenchmarkNot measured67.6%Only o3 measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index40
Math benchmarks for Gemini 3.6 Flash and o3
BenchmarkGemini 3.6 Flasho3Leader
AIMENot measured85.3%Only o3 measured
MATH 500 (Vals AI)Not measured94.6%Only o3 measured
MGSM (Vals AI)Not measured91.8%Only o3 measured
AA Math IndexNot measured88.3Only o3 measured
AIME 2025 (Artificial Analysis run)Not measured88.3%Only o3 measured
OTIS Mock AIME94.2%84.4%Gemini 3.6 Flash
FrontierMath, tiers 1 to 358.9%33.3%Gemini 3.6 Flash
FrontierMath, tier 422.0%Not measuredOnly Gemini 3.6 Flash measured
ProofBench36.0%Not measuredOnly Gemini 3.6 Flash measured
MATH level 5Not measured97.8%Only o3 measured
LMArena Text: math15081426Gemini 3.6 Flash
LMArena Text: mathematical work14921423Gemini 3.6 Flash
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index120
Knowledge benchmarks for Gemini 3.6 Flash and o3
BenchmarkGemini 3.6 Flasho3Leader
MMLU Pro89.3%85.6%Gemini 3.6 Flash
LegalBench (Vals AI)86.7%83.8%Gemini 3.6 Flash
CorpFin (Vals AI)63.3%59.7%Gemini 3.6 Flash
TaxEval (Vals AI)74.9%74.6%Gemini 3.6 Flash
MortgageTax (Vals AI)67.6%65.7%Gemini 3.6 Flash
MedQA (Vals AI)Not measured96.1%Only o3 measured
MedCode (Vals AI)53.1%47.3%Gemini 3.6 Flash
MMLU Pro (Artificial Analysis run)Not measured85.3%Only o3 measured
SimpleQA Verified66.2%49.4%Gemini 3.6 Flash
GeoBenchNot measured74.0%Only o3 measured
LMArena Text: science14891429Gemini 3.6 Flash
LMArena Text: medicine and healthcare14691448Gemini 3.6 Flash
LMArena Text: legal and government14791428Gemini 3.6 Flash
LMArena Text: business and finance14641393Gemini 3.6 Flash
FACTS Benchmark Suite65.3%44.4%Gemini 3.6 Flash
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index50
Web design benchmarks for Gemini 3.6 Flash and o3
BenchmarkGemini 3.6 Flasho3Leader
Design Arena: websites13001036Gemini 3.6 Flash
Design Arena: UI components12941017Gemini 3.6 Flash
Design Arena: game dev12631034Gemini 3.6 Flash
Design Arena: data viz12891200Gemini 3.6 Flash
Design Arena: 3D1271Not measuredOnly Gemini 3.6 Flash measured
Design Arena: all code categories12891020Gemini 3.6 Flash
Design Arena: ASCII art1281Not measuredOnly Gemini 3.6 Flash measured
Neither model has a result on the other 2 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index280
General benchmarks for Gemini 3.6 Flash and o3
BenchmarkGemini 3.6 Flasho3Leader
Public Benefits Bench (Vals AI)56.6%Not measuredOnly Gemini 3.6 Flash measured
SAGE (Vals AI)48.7%41.8%Gemini 3.6 Flash
MedScribe (Vals AI)79.7%76.7%Gemini 3.6 Flash
Vals Multimodal Index65.1%Not measuredOnly Gemini 3.6 Flash measured
IFBenchNot measured71.4%Only o3 measured
Long context reasoning (AA-LCR)80.0%74.7%Gemini 3.6 Flash
DTBench95.5%84.8%Gemini 3.6 Flash
LMCA44.9%39.7%Gemini 3.6 Flash
Fiction.LiveBenchNot measured88.9%Only o3 measured
Creative writing (Lech Mazur)Not measured83.9%Only o3 measured
CL-benchNot measured17.8%Only o3 measured
Furniture assembly23.3%Not measuredOnly Gemini 3.6 Flash measured
LMArena Text14801410Gemini 3.6 Flash
LMArena Text: instruction following14671368Gemini 3.6 Flash
LMArena Text: creative writing14661359Gemini 3.6 Flash
LMArena Vision12991214Gemini 3.6 Flash
LMArena Text: English14821417Gemini 3.6 Flash
LMArena Text: non-English14701401Gemini 3.6 Flash
LMArena Text: Chinese15311437Gemini 3.6 Flash
LMArena Text: German14801420Gemini 3.6 Flash
LMArena Text: Japanese14751403Gemini 3.6 Flash
LMArena Text: Korean14291370Gemini 3.6 Flash
LMArena Text: French15031430Gemini 3.6 Flash
LMArena Text: Spanish14761395Gemini 3.6 Flash
LMArena Text: Russian14881406Gemini 3.6 Flash
LMArena Text: Polish14731438Gemini 3.6 Flash
LMArena Text: multi-turn14811405Gemini 3.6 Flash
LMArena Text: longer queries14751372Gemini 3.6 Flash
LMArena Text: writing and language14701372Gemini 3.6 Flash
LMArena Text: entertainment and media14561373Gemini 3.6 Flash
LMArena Vision: English12951221Gemini 3.6 Flash
LMArena Vision: Chinese13571237Gemini 3.6 Flash
LMArena Vision: reading text13121218Gemini 3.6 Flash
LMArena Vision: humor12891222Gemini 3.6 Flash
LMArena Vision: captioningNot measured1210Only o3 measured
LMArena Vision: recognizing thingsNot measured1234Only o3 measured
LMArena Vision: creative writing12781201Gemini 3.6 Flash
LMArena Document1456Not measuredOnly Gemini 3.6 Flash measured
Neither model has a result on the other 8 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Gemini 3.6 Flash and o3
BenchmarkGemini 3.6 Flasho3Leader
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 3.6 Flash$0.0026Fits in one request
o3$0.0060Fits in one request

Gemini 3.6 Flash costs less

Repository review

50K input + 3K output tokens

Gemini 3.6 Flash$0.049Fits in one request
o3$0.124Fits in one request

Gemini 3.6 Flash costs less

Agent loop

200K input + 10K output tokens

Gemini 3.6 Flash$0.188Fits in one request
o3$0.480Exceeds the context window

Gemini 3.6 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 3.6 Flash and o3
SpecificationGoogle Gemini 3.6 FlashOpenAI o3
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJuly 21, 2026April 16, 2025
Context window1.05M200K
Input $/Mtok$0.75$2.00
Output $/Mtok$3.75$8.00
Coding index62.5Not benchmarked
Independent measurements behind it40
Cost per solved task$1.49$0.571
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 3.6 Flash better than o3 for coding?

Only Gemini 3.6 Flash has a coding score, 62.5 on the Vibe Coding Index; o3 has none, so the two cannot be ranked on coding. Pick o3 for a lower cost per solved task ($0.571 against $1.49) and work measured by ALE-Bench, where it leads.

Which is cheaper, Gemini 3.6 Flash or o3?

Gemini 3.6 Flash costs $0.75 per million input tokens and $3.75 per million output tokens; o3 costs $2.00 and $8.00. Per solved SWE-bench Verified task, Gemini 3.6 Flash costs $1.49 and o3 $0.571.

Which has the bigger context window, Gemini 3.6 Flash or o3?

Gemini 3.6 Flash, with 1.05M tokens against 200K.

How many benchmarks is the Gemini 3.6 Flash vs o3 comparison based on?

71 benchmarks have a result for both models as of October 22, 2026. Gemini 3.6 Flash's coding index rests on 4 independent benchmarks and o3's on 0. Where only one model has a result, the page says so instead of naming a winner.

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