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Gemini 3.5 Flash Lite vs gpt-oss-120b

Gemini 3.5 Flash Lite leads gpt-oss-120b on the Artificial Analysis Intelligence Index, 22.2 to 11.6, and gpt-oss-120b costs 5.0x less per output token ($0.50 vs $2.50 per million). Updated October 22, 2026; 52 benchmarks have a result for both.

Replace Gemini 3.5 Flash Lite Replace gpt-oss-120b
Gemini 3.5 Flash LiteGoogle
Coding
49.0
Overall
49.8
Output $/M
$2.50
47
gpt-oss-120bOpenAI
Coding
No data
Overall
50.0
Output $/M
$0.50
5
vs boards won of 52 shared

Gemini 3.5 Flash Lite or gpt-oss-120b: which to pick

Only Gemini 3.5 Flash Lite has a coding score, 49.0 on the Vibe Coding Index; gpt-oss-120b has none, so the two cannot be ranked on coding.

Pick gpt-oss-120b for output tokens 5.0x cheaper ($0.50 vs $2.50 per million) and work measured by LiveCodeBench (Vals AI) or WeirdML, where it leads.

Model AGemini 3.5 Flash LiteGoogle49.0/1003 independent benchmarks$0.41 per solved taskModel Bgpt-oss-120bOpenAINot benchmarked1 independent benchmark$0.51 per solved task
Shared results
52
Gemini 3.5 Flash Lite only
33
gpt-oss-120b only
29
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 3.5 Flash Lite 49.0 from 3 benchmarks, gpt-oss-120b not benchmarked.
Widest category
Agentic work, 17.8 points apart on average over 2 shared benchmarks.
Widest single gap
SWE-bench Verified (Vals AI): Gemini 3.5 Flash Lite 75.0% against gpt-oss-120b 33.6%, 41.4 points apart on a 0 to 100 scale.
Output price
Gemini 3.5 Flash Lite $2.50 against gpt-oss-120b $0.50 per million output tokens, 5.0x apart.
Context window
Gemini 3.5 Flash Lite takes 1.05M tokens, gpt-oss-120b 131K.

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 Flash LiteBarsgpt-oss-120bTies
Coding63
Intelligence20
Agentic work20
Reasoning71
Math21
Knowledge80
General200
All shared boards475
CodingLike-for-likeSix of these boards feed the Vibe Coding Index63
Coding benchmarks for Gemini 3.5 Flash Lite and gpt-oss-120b
BenchmarkGemini 3.5 Flash Litegpt-oss-120bLeader
Aider polyglotNot measured41.8%Only gpt-oss-120b measured
SWE-bench VerifiedNot measured26.0%Only gpt-oss-120b measured
LMArena WebDev1435Not measuredOnly Gemini 3.5 Flash Lite measured
AA Coding Index49.330.4Gemini 3.5 Flash Lite
LiveCodeBench (Vals AI)79.0%83.2%gpt-oss-120b
SWE-bench Verified (Vals AI)75.0%33.6%Gemini 3.5 Flash Lite
Vibe Code Bench (Vals AI)37.2%Not measuredOnly Gemini 3.5 Flash Lite measured
Code migration (Vals AI)6.2%Not measuredOnly Gemini 3.5 Flash Lite measured
ProgramBench (Vals AI)0.0%Not measuredOnly Gemini 3.5 Flash Lite measured
Terminal-Bench 2.1 (Vals AI)50.2%Not measuredOnly Gemini 3.5 Flash Lite measured
CyberBench (Vals AI)59.1%Not measuredOnly Gemini 3.5 Flash Lite measured
LiveCodeBench (Artificial Analysis run)Not measured87.8%Only gpt-oss-120b measured
SciCode41.3%34.0%Gemini 3.5 Flash Lite
Terminal-Bench Hard (Artificial Analysis run)Not measured23.5%Only gpt-oss-120b measured
Terminal-BenchNot measured18.7%Only gpt-oss-120b measured
WeirdML39.0%48.2%gpt-oss-120b
ALE-Bench765.3575.6Gemini 3.5 Flash Lite
LMArena Text: coding14531379Gemini 3.5 Flash Lite
LMArena Text: software and IT14511387Gemini 3.5 Flash Lite
LMArena WebDev: React1408Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena WebDev: from an image1448Not measuredOnly Gemini 3.5 Flash Lite measured
SciCode6.2%7.7%gpt-oss-120b
Neither model has a result on the other 17 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Gemini 3.5 Flash Lite and gpt-oss-120b
BenchmarkGemini 3.5 Flash Litegpt-oss-120bLeader
AA Intelligence Index22.211.6Gemini 3.5 Flash Lite
Epoch Capabilities Index144.9139.8Gemini 3.5 Flash Lite
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
Agentic work benchmarks for Gemini 3.5 Flash Lite and gpt-oss-120b
BenchmarkGemini 3.5 Flash Litegpt-oss-120bLeader
AA Agentic Index14.33.7Gemini 3.5 Flash Lite
Finance Agent (Vals AI)47.4%Not measuredOnly Gemini 3.5 Flash Lite measured
Tax Agent Bench (Vals AI)7.2%Not measuredOnly Gemini 3.5 Flash Lite measured
Legal Research Bench (Vals AI)13.9%Not measuredOnly Gemini 3.5 Flash Lite measured
Excel Modeling Benchmark (Vals AI)43.2%Not measuredOnly Gemini 3.5 Flash Lite measured
τ²-Bench TelecomNot measured65.8%Only gpt-oss-120b measured
APEX-Agents29.3%4.4%Gemini 3.5 Flash Lite
METR time horizonsNot measured56.6%Only gpt-oss-120b measured
Vending-Bench 2Not measured-$22Only gpt-oss-120b measured
BrowseComp-PlusNot measured67.0%Only gpt-oss-120b measured
Neither model has a result on the other 31 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index71
Reasoning benchmarks for Gemini 3.5 Flash Lite and gpt-oss-120b
BenchmarkGemini 3.5 Flash Litegpt-oss-120bLeader
GPQA Diamond83.8%78.5%Gemini 3.5 Flash Lite
MMMU Pro (Vals AI)83.6%Not measuredOnly Gemini 3.5 Flash Lite measured
GPQA Diamond (Artificial Analysis run)83.8%78.2%Gemini 3.5 Flash Lite
Humanity's Last Exam (Artificial Analysis run)18.8%19.6%gpt-oss-120b
GPQA Diamond (Epoch AI run)83.3%75.8%Gemini 3.5 Flash Lite
ARC-AGI53.5%Not measuredOnly Gemini 3.5 Flash Lite measured
ARC-AGI-210.3%Not measuredOnly Gemini 3.5 Flash Lite measured
SimpleBenchNot measured22.1%Only gpt-oss-120b measured
Chess puzzles21.0%Not measuredOnly Gemini 3.5 Flash Lite measured
Mystery game puzzles19.0%2.0%Gemini 3.5 Flash Lite
LMArena Text: hard prompts14411364Gemini 3.5 Flash Lite
LMArena Text: expert14341356Gemini 3.5 Flash Lite
LMArena Text: hard prompts in English14401368Gemini 3.5 Flash Lite
LMArena Vision: diagrams1284Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena Vision: homework1291Not measuredOnly Gemini 3.5 Flash Lite measured
Kagi LLM BenchmarkNot measured58.6%Only gpt-oss-120b measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index21
Math benchmarks for Gemini 3.5 Flash Lite and gpt-oss-120b
BenchmarkGemini 3.5 Flash Litegpt-oss-120bLeader
AIMENot measured92.6%Only gpt-oss-120b measured
MATH 500 (Vals AI)Not measured94.8%Only gpt-oss-120b measured
MGSM (Vals AI)Not measured92.0%Only gpt-oss-120b measured
AA Math IndexNot measured93.4Only gpt-oss-120b measured
AIME 2025 (Artificial Analysis run)Not measured93.4%Only gpt-oss-120b measured
OTIS Mock AIME71.1%88.9%gpt-oss-120b
FrontierMath, tiers 1 to 326.0%Not measuredOnly Gemini 3.5 Flash Lite measured
FrontierMath, tier 40.0%Not measuredOnly Gemini 3.5 Flash Lite measured
ProofBench13.0%Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena Text: math14341389Gemini 3.5 Flash Lite
LMArena Text: mathematical work14331386Gemini 3.5 Flash Lite
Neither model has a result on the other 2 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index80
Knowledge benchmarks for Gemini 3.5 Flash Lite and gpt-oss-120b
BenchmarkGemini 3.5 Flash Litegpt-oss-120bLeader
MMLU Pro85.8%79.2%Gemini 3.5 Flash Lite
LegalBench (Vals AI)84.1%75.9%Gemini 3.5 Flash Lite
CaseLaw (Vals AI)Not measured48.8%Only gpt-oss-120b measured
CorpFin (Vals AI)60.7%58.2%Gemini 3.5 Flash Lite
TaxEval (Vals AI)72.6%71.6%Gemini 3.5 Flash Lite
MortgageTax (Vals AI)68.7%Not measuredOnly Gemini 3.5 Flash Lite measured
MedQA (Vals AI)Not measured91.4%Only gpt-oss-120b measured
MedCode (Vals AI)43.5%Not measuredOnly Gemini 3.5 Flash Lite measured
MMLU Pro (Artificial Analysis run)Not measured80.8%Only gpt-oss-120b measured
LMArena Text: science14511382Gemini 3.5 Flash Lite
LMArena Text: medicine and healthcare14381388Gemini 3.5 Flash Lite
LMArena Text: legal and government14311355Gemini 3.5 Flash Lite
LMArena Text: business and finance14231359Gemini 3.5 Flash Lite
FACTS Benchmark Suite53.5%Not measuredOnly Gemini 3.5 Flash Lite measured
Neither model has a result on the other 4 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared
Web design benchmarks for Gemini 3.5 Flash Lite and gpt-oss-120b
BenchmarkGemini 3.5 Flash Litegpt-oss-120bLeader
Design Arena: websitesNot measured967Only gpt-oss-120b measured
Design Arena: UI componentsNot measured924Only gpt-oss-120b measured
Design Arena: game devNot measured992Only gpt-oss-120b measured
Design Arena: data vizNot measured987Only gpt-oss-120b measured
Design Arena: 3DNot measured901Only gpt-oss-120b measured
Design Arena: all code categoriesNot measured962Only gpt-oss-120b measured
Neither model has a result on the other 3 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index200
General benchmarks for Gemini 3.5 Flash Lite and gpt-oss-120b
BenchmarkGemini 3.5 Flash Litegpt-oss-120bLeader
Public Benefits Bench (Vals AI)51.8%Not measuredOnly Gemini 3.5 Flash Lite measured
SAGE (Vals AI)47.3%Not measuredOnly Gemini 3.5 Flash Lite measured
MedScribe (Vals AI)70.9%Not measuredOnly Gemini 3.5 Flash Lite measured
IFBenchNot measured69.0%Only gpt-oss-120b measured
Long context reasoning (AA-LCR)76.0%52.0%Gemini 3.5 Flash Lite
DTBench83.5%76.3%Gemini 3.5 Flash Lite
LMCA37.6%22.1%Gemini 3.5 Flash Lite
Fiction.LiveBenchNot measured44.4%Only gpt-oss-120b measured
Creative writing (Lech Mazur)Not measured77.1%Only gpt-oss-120b measured
Surface Evolver BenchNot measured25.0%Only gpt-oss-120b measured
LMArena Text14351366Gemini 3.5 Flash Lite
LMArena Text: instruction following14191318Gemini 3.5 Flash Lite
LMArena Text: creative writing14211274Gemini 3.5 Flash Lite
LMArena Vision1269Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena Text: English14381375Gemini 3.5 Flash Lite
LMArena Text: non-English14271351Gemini 3.5 Flash Lite
LMArena Text: Chinese14681385Gemini 3.5 Flash Lite
LMArena Text: German14541353Gemini 3.5 Flash Lite
LMArena Text: Japanese14261331Gemini 3.5 Flash Lite
LMArena Text: Korean14071282Gemini 3.5 Flash Lite
LMArena Text: French14511370Gemini 3.5 Flash Lite
LMArena Text: Spanish14411389Gemini 3.5 Flash Lite
LMArena Text: Russian14431343Gemini 3.5 Flash Lite
LMArena Text: Polish14371353Gemini 3.5 Flash Lite
LMArena Text: multi-turn14451340Gemini 3.5 Flash Lite
LMArena Text: longer queries14351319Gemini 3.5 Flash Lite
LMArena Text: writing and language14281306Gemini 3.5 Flash Lite
LMArena Text: entertainment and media14141292Gemini 3.5 Flash Lite
LMArena Vision: English1269Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena Vision: Chinese1311Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena Vision: reading text1280Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena Vision: humor1287Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena Vision: creative writing1260Not measuredOnly Gemini 3.5 Flash Lite 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 3.5 Flash Lite and gpt-oss-120b
BenchmarkGemini 3.5 Flash Litegpt-oss-120bLeader
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 Lite$0.0015Fits in one request
gpt-oss-120b$0.0003Fits in one request

gpt-oss-120b costs less

Repository review

50K input + 3K output tokens

Gemini 3.5 Flash Lite$0.022Fits in one request
gpt-oss-120b$0.0065Fits in one request

gpt-oss-120b costs less

Agent loop

200K input + 10K output tokens

Gemini 3.5 Flash Lite$0.085Fits in one request
gpt-oss-120b$0.025Exceeds the context window

gpt-oss-120b 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 Lite and gpt-oss-120b
SpecificationGoogle Gemini 3.5 Flash LiteOpenAI gpt-oss-120b
MakerGoogleOpenAI
WeightsNo public weights listedOpen weights
ReleasedJuly 21, 2026August 5, 2025
Context window1.05M131K
Input $/Mtok$0.30$0.10
Output $/Mtok$2.50$0.50
Coding index49.0Not benchmarked
Independent measurements behind it31
Cost per solved task$0.41$0.51
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 3.5 Flash Lite better than gpt-oss-120b for coding?

Only Gemini 3.5 Flash Lite has a coding score, 49.0 on the Vibe Coding Index; gpt-oss-120b has none, so the two cannot be ranked on coding. Pick gpt-oss-120b for output tokens 5.0x cheaper ($0.50 vs $2.50 per million) and work measured by LiveCodeBench (Vals AI) or WeirdML, where it leads.

Which is cheaper, Gemini 3.5 Flash Lite or gpt-oss-120b?

Gemini 3.5 Flash Lite costs $0.30 per million input tokens and $2.50 per million output tokens; gpt-oss-120b costs $0.10 and $0.50. Per solved SWE-bench Verified task, Gemini 3.5 Flash Lite costs $0.41 and gpt-oss-120b $0.51.

Which has the bigger context window, Gemini 3.5 Flash Lite or gpt-oss-120b?

Gemini 3.5 Flash Lite, with 1.05M tokens against 131K.

How many benchmarks is the Gemini 3.5 Flash Lite vs gpt-oss-120b comparison based on?

52 benchmarks have a result for both models as of October 22, 2026. Gemini 3.5 Flash Lite's coding index rests on 3 independent benchmarks and gpt-oss-120b's on 1. Where only one model has a result, the page says so instead of naming a winner.

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