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GLM 4.5 Air vs o4 Mini

o4 Mini leads GLM 4.5 Air on the Artificial Analysis Intelligence Index, 16.7 to 11.1, and GLM 4.5 Air costs 4.0x less per output token ($1.10 vs $4.40 per million). Updated October 21, 2026; 46 benchmarks have a result for both.

Replace GLM 4.5 Air Replace o4 Mini
GLM 4.5 AirZ.ai
Coding
No data
Overall
11.1
Output $/M
$1.10
34
o4 MiniOpenAI
Coding
No data
Overall
16.7
Output $/M
$4.40
12
vs boards won of 46 shared

GLM 4.5 Air or o4 Mini: which to pick

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

Pick GLM 4.5 Air for output tokens 4.0x cheaper ($1.10 vs $4.40 per million) and work measured by LiveCodeBench (Artificial Analysis run) or GSO-Bench, where it leads.

Model AGLM 4.5 AirZ.aiNot benchmarkedNo coding benchmarkNo cost per solved taskModel Bo4 MiniOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
46
GLM 4.5 Air only
1
o4 Mini only
48
Like-for-like categories
8 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
GLM 4.5 Air not benchmarked, o4 Mini not benchmarked.
Widest category
Web design, 21.2 points apart on average over 6 shared benchmarks.
Widest single gap
Design Arena: 3D: GLM 4.5 Air 1123 against o4 Mini 854, 33.6 points apart on a 0 to 100 scale.
Output price
GLM 4.5 Air $1.10 against o4 Mini $4.40 per million output tokens, 4.0x apart.
Context window
GLM 4.5 Air takes 131K tokens, o4 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
CategoryGLM 4.5 AirBarso4 MiniTies
Coding32
Intelligence01
Agentic work01
Reasoning32
Math22
Knowledge41
Web design60
General163
All shared boards3412
CodingLike-for-likeSix of these boards feed the Vibe Coding Index32
Coding benchmarks for GLM 4.5 Air and o4 Mini
BenchmarkGLM 4.5 Airo4 MiniLeader
Aider polyglotNot measured72.0%Only o4 Mini measured
SWE-bench VerifiedNot measured64.6%Only o4 Mini measured
SWE-bench MultimodalNot measured33.9%Only o4 Mini measured
LiveCodeBench (Vals AI)Not measured82.2%Only o4 Mini measured
LiveCodeBench (Artificial Analysis run)68.4%85.9%o4 Mini
Terminal-Bench Hard (Artificial Analysis run)20.5%15.2%GLM 4.5 Air
GSO-Bench2.9%3.6%o4 Mini
WeirdMLNot measured52.6%Only o4 Mini measured
LMArena Text: coding13971368GLM 4.5 Air
LMArena Text: software and IT14011367GLM 4.5 Air
Neither model has a result on the other 28 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for GLM 4.5 Air and o4 Mini
BenchmarkGLM 4.5 Airo4 MiniLeader
AA Intelligence Index11.116.7o4 Mini
Epoch Capabilities IndexNot measured145.5Only o4 Mini measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for GLM 4.5 Air and o4 Mini
BenchmarkGLM 4.5 Airo4 MiniLeader
τ²-Bench Telecom46.5%55.6%o4 Mini
METR time horizonsNot measured63.9%Only o4 Mini measured
Neither model has a result on the other 37 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index32
Reasoning benchmarks for GLM 4.5 Air and o4 Mini
BenchmarkGLM 4.5 Airo4 MiniLeader
GPQA DiamondNot measured74.5%Only o4 Mini measured
MMMU Pro (Vals AI)Not measured79.7%Only o4 Mini measured
GPQA Diamond (Artificial Analysis run)73.3%78.4%o4 Mini
Humanity's Last Exam (Artificial Analysis run)7.0%16.5%o4 Mini
GPQA Diamond (Epoch AI run)Not measured79.6%Only o4 Mini measured
ARC-AGINot measured58.7%Only o4 Mini measured
ARC-AGI-2Not measured6.1%Only o4 Mini measured
SimpleBenchNot measured38.7%Only o4 Mini measured
Chess puzzlesNot measured22.0%Only o4 Mini measured
Mystery game puzzlesNot measured5.0%Only o4 Mini measured
VPCTNot measured57.5%Only o4 Mini measured
LMArena Text: hard prompts13791351GLM 4.5 Air
LMArena Text: expert13701343GLM 4.5 Air
LMArena Text: hard prompts in English13881366GLM 4.5 Air
LMArena Vision: diagramsNot measured1197Only o4 Mini measured
LMArena Vision: homeworkNot measured1234Only o4 Mini measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index22
Math benchmarks for GLM 4.5 Air and o4 Mini
BenchmarkGLM 4.5 Airo4 MiniLeader
AIMENot measured83.7%Only o4 Mini measured
MATH 500 (Vals AI)Not measured94.2%Only o4 Mini measured
MGSM (Vals AI)Not measured93.4%Only o4 Mini measured
AA Math Index80.790.7o4 Mini
AIME 2025 (Artificial Analysis run)80.7%90.7%o4 Mini
OTIS Mock AIMENot measured81.7%Only o4 Mini measured
FrontierMath, tiers 1 to 3Not measured36.1%Only o4 Mini measured
FrontierMath, tier 4Not measured4.9%Only o4 Mini measured
MATH level 5Not measured97.8%Only o4 Mini measured
LMArena Text: math13961389GLM 4.5 Air
LMArena Text: mathematical work13961379GLM 4.5 Air
Neither model has a result on the other 2 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index41
Knowledge benchmarks for GLM 4.5 Air and o4 Mini
BenchmarkGLM 4.5 Airo4 MiniLeader
MMLU ProNot measured80.6%Only o4 Mini measured
LegalBench (Vals AI)Not measured79.2%Only o4 Mini measured
CorpFin (Vals AI)Not measured59.0%Only o4 Mini measured
TaxEval (Vals AI)Not measured74.8%Only o4 Mini measured
MortgageTax (Vals AI)Not measured64.8%Only o4 Mini measured
MedQA (Vals AI)Not measured96.0%Only o4 Mini measured
MedCode (Vals AI)Not measured33.8%Only o4 Mini measured
MMLU Pro (Artificial Analysis run)81.5%83.2%o4 Mini
SimpleQA VerifiedNot measured19.6%Only o4 Mini measured
GeoBenchNot measured64.0%Only o4 Mini measured
LMArena Text: science14071354GLM 4.5 Air
LMArena Text: medicine and healthcare14021361GLM 4.5 Air
LMArena Text: legal and government13821350GLM 4.5 Air
LMArena Text: business and finance13711325GLM 4.5 Air
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for GLM 4.5 Air and o4 Mini
BenchmarkGLM 4.5 Airo4 MiniLeader
Design Arena: websites1146985GLM 4.5 Air
Design Arena: UI components1123983GLM 4.5 Air
Design Arena: game dev10941003GLM 4.5 Air
Design Arena: data viz1186990GLM 4.5 Air
Design Arena: 3D1123854GLM 4.5 Air
Design Arena: all code categories1137976GLM 4.5 Air
Design Arena: SVG1071Not measuredOnly GLM 4.5 Air measured
Neither model has a result on the other 2 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index163
General benchmarks for GLM 4.5 Air and o4 Mini
BenchmarkGLM 4.5 Airo4 MiniLeader
SAGE (Vals AI)Not measured41.1%Only o4 Mini measured
MedScribe (Vals AI)Not measured69.1%Only o4 Mini measured
IFBench37.6%68.7%o4 Mini
Long context reasoning (AA-LCR)46.7%61.0%o4 Mini
DTBenchNot measured77.6%Only o4 Mini measured
LMCANot measured26.5%Only o4 Mini measured
Fiction.LiveBenchNot measured77.8%Only o4 Mini measured
Creative writing (Lech Mazur)Not measured75.0%Only o4 Mini measured
LMArena Text13841353GLM 4.5 Air
LMArena Text: instruction following13541320GLM 4.5 Air
LMArena Text: creative writing13431294GLM 4.5 Air
LMArena VisionNot measured1194Only o4 Mini measured
LMArena Text: English13971367GLM 4.5 Air
LMArena Text: non-English13661337GLM 4.5 Air
LMArena Text: Chinese14261354GLM 4.5 Air
LMArena Text: German13771336GLM 4.5 Air
LMArena Text: Japanese13481308GLM 4.5 Air
LMArena Text: Korean13081312o4 Mini
LMArena Text: French14001364GLM 4.5 Air
LMArena Text: Spanish13851346GLM 4.5 Air
LMArena Text: Russian13731334GLM 4.5 Air
LMArena Text: Polish13681358GLM 4.5 Air
LMArena Text: multi-turn13711350GLM 4.5 Air
LMArena Text: longer queries13661315GLM 4.5 Air
LMArena Text: writing and language13541316GLM 4.5 Air
LMArena Text: entertainment and media13391308GLM 4.5 Air
LMArena Vision: EnglishNot measured1200Only o4 Mini measured
LMArena Vision: ChineseNot measured1218Only o4 Mini measured
LMArena Vision: reading textNot measured1197Only o4 Mini measured
LMArena Vision: humorNot measured1199Only o4 Mini measured
LMArena Vision: captioningNot measured1204Only o4 Mini measured
LMArena Vision: recognizing thingsNot measured1218Only o4 Mini measured
LMArena Vision: creative writingNot measured1166Only o4 Mini 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 GLM 4.5 Air and o4 Mini
BenchmarkGLM 4.5 Airo4 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

GLM 4.5 Air$0.0008Fits in one request
o4 Mini$0.0033Fits in one request

GLM 4.5 Air costs less

Repository review

50K input + 3K output tokens

GLM 4.5 Air$0.013Fits in one request
o4 Mini$0.068Fits in one request

GLM 4.5 Air costs less

Agent loop

200K input + 10K output tokens

GLM 4.5 Air$0.051Exceeds the context window
o4 Mini$0.264Exceeds the context window

GLM 4.5 Air 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 GLM 4.5 Air and o4 Mini
SpecificationZ.ai GLM 4.5 AirOpenAI o4 Mini
MakerZ.aiOpenAI
WeightsOpen weightsNo public weights listed
ReleasedJuly 25, 2025April 16, 2025
Context window131K200K
Input $/Mtok$0.20$1.10
Output $/Mtok$1.10$4.40
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GLM 4.5 Air better than o4 Mini for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GLM 4.5 Air for output tokens 4.0x cheaper ($1.10 vs $4.40 per million) and work measured by LiveCodeBench (Artificial Analysis run) or GSO-Bench, where it leads.

Which is cheaper, GLM 4.5 Air or o4 Mini?

GLM 4.5 Air costs $0.20 per million input tokens and $1.10 per million output tokens; o4 Mini costs $1.10 and $4.40. Cost per solved task is known for neither of them.

Which has the bigger context window, GLM 4.5 Air or o4 Mini?

o4 Mini, with 200K tokens against 131K.

How many benchmarks is the GLM 4.5 Air vs o4 Mini comparison based on?

46 benchmarks have a result for both models as of October 21, 2026. GLM 4.5 Air's coding index rests on 0 independent benchmarks and o4 Mini's on 0. Where only one model has a result, the page says so instead of naming a winner.

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