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Gemini 3.5 Flash Lite vs GLM 5.1

GLM 5.1 leads Gemini 3.5 Flash Lite on coding, 49.2 to 49.0 on the Vibe Coding Index, and Gemini 3.5 Flash Lite costs 1.8x less per output token ($2.50 vs $4.40 per million). Updated October 22, 2026; 62 benchmarks have a result for both.

Replace Gemini 3.5 Flash Lite Replace GLM 5.1
Gemini 3.5 Flash LiteGoogle
Coding
49.0
Overall
49.8
Output $/M
$2.50
6
GLM 5.1Z.ai
Coding
49.2
Overall
57.5
Output $/M
$4.40
55
vs boards won of 62 shared, 1 tied

Gemini 3.5 Flash Lite or GLM 5.1: which to pick

Gemini 3.5 Flash Lite and GLM 5.1 are level for coding, 49.0 against 49.2 on the Vibe Coding Index, so price and context decide.

Pick Gemini 3.5 Flash Lite for output tokens 1.8x cheaper ($2.50 vs $4.40 per million) and a lower cost per solved task ($0.41 against $0.60). Pick GLM 5.1 for work measured by LMArena WebDev or AA Coding Index, where it leads.

Model AGemini 3.5 Flash LiteGoogle49.0/1003 independent benchmarks$0.41 per solved taskModel BGLM 5.1Z.ai49.2/1003 independent benchmarks$0.60 per solved task
Shared results
62
Gemini 3.5 Flash Lite only
23
GLM 5.1 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 3.5 Flash Lite 49.0 from 3 benchmarks, GLM 5.1 49.2 from 3 benchmarks.
Widest category
Math, 11.0 points apart on average over 5 shared benchmarks.
Widest single gap
OTIS Mock AIME: Gemini 3.5 Flash Lite 71.1% against GLM 5.1 93.3%, 22.2 points apart on a 0 to 100 scale.
Output price
Gemini 3.5 Flash Lite $2.50 against GLM 5.1 $4.40 per million output tokens, 1.8x apart.
Context window
Gemini 3.5 Flash Lite takes 1.05M tokens, GLM 5.1 205K.

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 LiteBarsGLM 5.1Ties
Coding1121 tie
Intelligence02
Agentic work13
Reasoning17
Math05
Knowledge27
General119
All shared boards6551 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index112
Coding benchmarks for Gemini 3.5 Flash Lite and GLM 5.1
BenchmarkGemini 3.5 Flash LiteGLM 5.1Leader
LMArena WebDev14351508GLM 5.1
AA Coding Index49.355.8GLM 5.1
LiveCodeBench (Vals AI)79.0%81.4%GLM 5.1
SWE-bench Verified (Vals AI)75.0%76.4%GLM 5.1
Vibe Code Bench (Vals AI)37.2%31.5%Gemini 3.5 Flash Lite
Code migration (Vals AI)6.2%25.8%GLM 5.1
ProgramBench (Vals AI)0.0%0.0%Tie
Terminal-Bench 2.1 (Vals AI)50.2%56.9%GLM 5.1
CyberBench (Vals AI)59.1%Not measuredOnly Gemini 3.5 Flash Lite measured
SciCode41.3%44.8%GLM 5.1
Terminal-Bench Hard (Artificial Analysis run)Not measured43.2%Only GLM 5.1 measured
WeirdML39.0%57.1%GLM 5.1
ALE-Bench765.3887.1GLM 5.1
LMArena Text: coding14531485GLM 5.1
LMArena Text: software and IT14511484GLM 5.1
LMArena WebDev: React14081505GLM 5.1
LMArena WebDev: HTMLNot measured1508Only GLM 5.1 measured
LMArena WebDev: from an image1448Not measuredOnly Gemini 3.5 Flash Lite measured
SciCode6.2%Not measuredOnly Gemini 3.5 Flash Lite measured
Neither model has a result on the other 20 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Gemini 3.5 Flash Lite and GLM 5.1
BenchmarkGemini 3.5 Flash LiteGLM 5.1Leader
AA Intelligence Index22.226.1GLM 5.1
Epoch Capabilities Index144.9149.8GLM 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index13
Agentic work benchmarks for Gemini 3.5 Flash Lite and GLM 5.1
BenchmarkGemini 3.5 Flash LiteGLM 5.1Leader
AA Agentic Index14.323.9GLM 5.1
Design Arena: agents building web appsNot measured1175Only GLM 5.1 measured
Design Arena: agents building full-stack appsNot measured1167Only GLM 5.1 measured
Design Arena: agents building mobile appsNot measured1162Only GLM 5.1 measured
Design Arena: agents building Android appsNot measured1182Only GLM 5.1 measured
Design Arena: agents building Godot gamesNot measured1053Only GLM 5.1 measured
Design Arena: agents building gamesNot measured1164Only GLM 5.1 measured
Design Arena: HTML slidesNot measured1120Only GLM 5.1 measured
Design Arena: PowerPoint slidesNot measured1163Only GLM 5.1 measured
Design Arena: spreadsheetsNot measured1315Only GLM 5.1 measured
Finance Agent (Vals AI)47.4%44.8%Gemini 3.5 Flash Lite
Tax Agent Bench (Vals AI)7.2%Not measuredOnly Gemini 3.5 Flash Lite measured
Legal Research Bench (Vals AI)13.9%27.9%GLM 5.1
Excel Modeling Benchmark (Vals AI)43.2%Not measuredOnly Gemini 3.5 Flash Lite measured
τ²-Bench TelecomNot measured97.7%Only GLM 5.1 measured
APEX-Agents29.3%40.9%GLM 5.1
Vending-Bench 2Not measured$5,634Only GLM 5.1 measured
Neither model has a result on the other 24 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index17
Reasoning benchmarks for Gemini 3.5 Flash Lite and GLM 5.1
BenchmarkGemini 3.5 Flash LiteGLM 5.1Leader
GPQA Diamond83.8%84.5%GLM 5.1
MMMU Pro (Vals AI)83.6%Not measuredOnly Gemini 3.5 Flash Lite measured
GPQA Diamond (Artificial Analysis run)83.8%86.8%GLM 5.1
Humanity's Last Exam (Artificial Analysis run)18.8%30.1%GLM 5.1
GPQA Diamond (Epoch AI run)83.3%89.9%GLM 5.1
ARC-AGI53.5%Not measuredOnly Gemini 3.5 Flash Lite measured
ARC-AGI-210.3%Not measuredOnly Gemini 3.5 Flash Lite measured
SimpleBenchNot measured55.1%Only GLM 5.1 measured
Chess puzzles21.0%20.0%Gemini 3.5 Flash Lite
Mystery game puzzles19.0%Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena Text: hard prompts14411473GLM 5.1
LMArena Text: expert14341478GLM 5.1
LMArena Text: hard prompts in English14401482GLM 5.1
LMArena Vision: diagrams1284Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena Vision: homework1291Not measuredOnly Gemini 3.5 Flash Lite measured
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index05
Math benchmarks for Gemini 3.5 Flash Lite and GLM 5.1
BenchmarkGemini 3.5 Flash LiteGLM 5.1Leader
AIMENot measured91.9%Only GLM 5.1 measured
OTIS Mock AIME71.1%93.3%GLM 5.1
FrontierMath, tiers 1 to 326.0%36.8%GLM 5.1
FrontierMath, tier 40.0%Not measuredOnly Gemini 3.5 Flash Lite measured
ProofBench13.0%22.2%GLM 5.1
LMArena Text: math14341473GLM 5.1
LMArena Text: mathematical work14331470GLM 5.1
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index27
Knowledge benchmarks for Gemini 3.5 Flash Lite and GLM 5.1
BenchmarkGemini 3.5 Flash LiteGLM 5.1Leader
MMLU Pro85.8%86.9%GLM 5.1
LegalBench (Vals AI)84.1%84.4%GLM 5.1
CaseLaw (Vals AI)Not measured51.5%Only GLM 5.1 measured
CorpFin (Vals AI)60.7%64.5%GLM 5.1
TaxEval (Vals AI)72.6%71.2%Gemini 3.5 Flash Lite
MortgageTax (Vals AI)68.7%Not measuredOnly Gemini 3.5 Flash Lite measured
MedCode (Vals AI)43.5%41.6%Gemini 3.5 Flash Lite
SimpleQA VerifiedNot measured34.0%Only GLM 5.1 measured
LMArena Text: science14511478GLM 5.1
LMArena Text: medicine and healthcare14381474GLM 5.1
LMArena Text: legal and government14311465GLM 5.1
LMArena Text: business and finance14231452GLM 5.1
FACTS Benchmark Suite53.5%Not measuredOnly Gemini 3.5 Flash Lite measured
Neither model has a result on the other 5 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for Gemini 3.5 Flash Lite and GLM 5.1
BenchmarkGemini 3.5 Flash LiteGLM 5.1Leader
Design Arena: websitesNot measured1290Only GLM 5.1 measured
Design Arena: UI componentsNot measured1292Only GLM 5.1 measured
Design Arena: game devNot measured1265Only GLM 5.1 measured
Design Arena: data vizNot measured1366Only GLM 5.1 measured
Design Arena: 3DNot measured1336Only GLM 5.1 measured
Design Arena: all code categoriesNot measured1268Only GLM 5.1 measured
Design Arena: SVGNot measured1218Only GLM 5.1 measured
Design Arena: ASCII artNot measured1141Only GLM 5.1 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index119
General benchmarks for Gemini 3.5 Flash Lite and GLM 5.1
BenchmarkGemini 3.5 Flash LiteGLM 5.1Leader
Public Benefits Bench (Vals AI)51.8%61.8%GLM 5.1
SAGE (Vals AI)47.3%Not measuredOnly Gemini 3.5 Flash Lite measured
MedScribe (Vals AI)70.9%72.3%GLM 5.1
IFBenchNot measured76.3%Only GLM 5.1 measured
Long context reasoning (AA-LCR)76.0%73.7%Gemini 3.5 Flash Lite
DTBench83.5%Not measuredOnly Gemini 3.5 Flash Lite measured
LMCA37.6%Not measuredOnly Gemini 3.5 Flash Lite measured
ExploitBenchNot measured18.1%Only GLM 5.1 measured
LMArena Text14351463GLM 5.1
LMArena Text: instruction following14191453GLM 5.1
LMArena Text: creative writing14211453GLM 5.1
LMArena Vision1269Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena Text: English14381476GLM 5.1
LMArena Text: non-English14271448GLM 5.1
LMArena Text: Chinese14681515GLM 5.1
LMArena Text: German14541467GLM 5.1
LMArena Text: Japanese14261435GLM 5.1
LMArena Text: Korean14071424GLM 5.1
LMArena Text: French14511470GLM 5.1
LMArena Text: Spanish14411468GLM 5.1
LMArena Text: Russian14431454GLM 5.1
LMArena Text: Polish14371449GLM 5.1
LMArena Text: multi-turn14451473GLM 5.1
LMArena Text: longer queries14351467GLM 5.1
LMArena Text: writing and language14281454GLM 5.1
LMArena Text: entertainment and media14141442GLM 5.1
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 15 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 GLM 5.1
BenchmarkGemini 3.5 Flash LiteGLM 5.1Leader
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
GLM 5.1$0.0036Fits in one request

Gemini 3.5 Flash Lite costs less

Repository review

50K input + 3K output tokens

Gemini 3.5 Flash Lite$0.022Fits in one request
GLM 5.1$0.083Fits in one request

Gemini 3.5 Flash Lite costs less

Agent loop

200K input + 10K output tokens

Gemini 3.5 Flash Lite$0.085Fits in one request
GLM 5.1$0.324Exceeds the context window

Gemini 3.5 Flash Lite 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 GLM 5.1
SpecificationGoogle Gemini 3.5 Flash LiteZ.ai GLM 5.1
MakerGoogleZ.ai
WeightsNo public weights listedOpen weights
ReleasedJuly 21, 2026April 7, 2026
Context window1.05M205K
Input $/Mtok$0.30$1.40
Output $/Mtok$2.50$4.40
Coding index49.049.2
Independent measurements behind it33
Cost per solved task$0.41$0.60
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 3.5 Flash Lite better than GLM 5.1 for coding?

Gemini 3.5 Flash Lite and GLM 5.1 are level for coding, 49.0 against 49.2 on the Vibe Coding Index, so price and context decide. Pick Gemini 3.5 Flash Lite for output tokens 1.8x cheaper ($2.50 vs $4.40 per million) and a lower cost per solved task ($0.41 against $0.60). Pick GLM 5.1 for work measured by LMArena WebDev or AA Coding Index, where it leads.

Which is cheaper, Gemini 3.5 Flash Lite or GLM 5.1?

Gemini 3.5 Flash Lite costs $0.30 per million input tokens and $2.50 per million output tokens; GLM 5.1 costs $1.40 and $4.40. Per solved SWE-bench Verified task, Gemini 3.5 Flash Lite costs $0.41 and GLM 5.1 $0.60.

Which has the bigger context window, Gemini 3.5 Flash Lite or GLM 5.1?

Gemini 3.5 Flash Lite, with 1.05M tokens against 205K.

How many benchmarks is the Gemini 3.5 Flash Lite vs GLM 5.1 comparison based on?

62 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 GLM 5.1's on 3. Where only one model has a result, the page says so instead of naming a winner.

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