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GLM 4.5 Air vs GPT-5 Mini

GPT-5 Mini leads GLM 4.5 Air on the Artificial Analysis Intelligence Index, 20.6 to 11.1, and GLM 4.5 Air costs 1.8x less per output token ($1.10 vs $2.00 per million). Updated October 21, 2026; 47 benchmarks have a result for both.

Replace GLM 4.5 Air Replace GPT-5 Mini
GLM 4.5 AirZ.ai
Coding
No data
Overall
No data
Output $/M
$1.10
27
GPT-5 MiniOpenAI
Coding
34.2
Overall
43.7
Output $/M
$2.00
20
vs boards won of 47 shared

GLM 4.5 Air or GPT-5 Mini: which to pick

Only GPT-5 Mini has a coding score, 34.2 on the Vibe Coding Index; GLM 4.5 Air has none, so the two cannot be ranked on coding.

Pick GLM 4.5 Air for output tokens 1.8x cheaper ($1.10 vs $2.00 per million) and work measured by LMArena Text: software and IT or LMArena Text: hard prompts in English, where it leads.

Model AGLM 4.5 AirZ.aiNot benchmarkedNo coding benchmarkNo cost per solved taskModel BGPT-5 MiniOpenAI34.2/1002 independent benchmarks$0.08 per solved task
Shared results
47
GLM 4.5 Air only
1
GPT-5 Mini only
54
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, GPT-5 Mini 34.2 from 2 benchmarks.
Widest category
Agentic work, 24.6 points apart on average over 1 shared benchmark.
Widest single gap
IFBench: GLM 4.5 Air 37.6% against GPT-5 Mini 75.4%, 37.9 points apart on a 0 to 100 scale.
Output price
GLM 4.5 Air $1.10 against GPT-5 Mini $2.00 per million output tokens, 1.8x apart.
Context window
GLM 4.5 Air takes 131K tokens, GPT-5 Mini 400K.

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 AirBarsGPT-5 MiniTies
Coding13
Intelligence01
Agentic work01
Reasoning15
Math22
Knowledge41
Web design52
General145
All shared boards2720
CodingLike-for-likeSix of these boards feed the Vibe Coding Index13
Coding benchmarks for GLM 4.5 Air and GPT-5 Mini
BenchmarkGLM 4.5 AirGPT-5 MiniLeader
SWE-bench VerifiedNot measured59.8%Only GPT-5 Mini measured
SWE-bench MultilingualNot measured39.7%Only GPT-5 Mini measured
LiveCodeBench (Vals AI)Not measured86.6%Only GPT-5 Mini measured
SWE-bench Verified (Vals AI)Not measured60.8%Only GPT-5 Mini measured
Vibe Code Bench (Vals AI)Not measured14.2%Only GPT-5 Mini measured
LiveCodeBench (Artificial Analysis run)68.4%83.8%GPT-5 Mini
SciCodeNot measured39.0%Only GPT-5 Mini measured
Terminal-Bench Hard (Artificial Analysis run)20.5%33.3%GPT-5 Mini
Terminal-BenchNot measured34.8%Only GPT-5 Mini measured
GSO-Bench2.9%Not measuredOnly GLM 4.5 Air measured
WeirdMLNot measured52.7%Only GPT-5 Mini measured
LMArena Text: coding13971406GPT-5 Mini
LMArena Text: software and IT14011394GLM 4.5 Air
Neither model has a result on the other 26 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for GLM 4.5 Air and GPT-5 Mini
BenchmarkGLM 4.5 AirGPT-5 MiniLeader
AA Intelligence Index11.120.6GPT-5 Mini
Epoch Capabilities IndexNot measured145.3Only GPT-5 Mini measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for GLM 4.5 Air and GPT-5 Mini
BenchmarkGLM 4.5 AirGPT-5 MiniLeader
τ²-Bench Telecom46.5%71.1%GPT-5 Mini
Vending-Bench 2Not measured-$31Only GPT-5 Mini measured
Berkeley Function Calling Leaderboard (BFCL)Not measured55.5%Only GPT-5 Mini measured
Neither model has a result on the other 38 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index15
Reasoning benchmarks for GLM 4.5 Air and GPT-5 Mini
BenchmarkGLM 4.5 AirGPT-5 MiniLeader
GPQA DiamondNot measured80.3%Only GPT-5 Mini measured
MMMU Pro (Vals AI)Not measured78.9%Only GPT-5 Mini measured
GPQA Diamond (Artificial Analysis run)73.3%82.8%GPT-5 Mini
Humanity's Last Exam (Artificial Analysis run)7.0%21.5%GPT-5 Mini
GPQA Diamond (Epoch AI run)Not measured75.0%Only GPT-5 Mini measured
ARC-AGINot measured54.3%Only GPT-5 Mini measured
ARC-AGI-2Not measured4.4%Only GPT-5 Mini measured
Chess puzzlesNot measured24.0%Only GPT-5 Mini measured
Mystery game puzzlesNot measured10.0%Only GPT-5 Mini measured
VPCTNot measured40.2%Only GPT-5 Mini measured
LMArena Text: hard prompts13791380GPT-5 Mini
LMArena Text: expert13701379GPT-5 Mini
LMArena Text: hard prompts in English13881383GLM 4.5 Air
LMArena Vision: diagramsNot measured1202Only GPT-5 Mini measured
LMArena Vision: homeworkNot measured1210Only GPT-5 Mini measured
Kagi LLM Benchmark43.0%70.3%GPT-5 Mini
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index22
Math benchmarks for GLM 4.5 Air and GPT-5 Mini
BenchmarkGLM 4.5 AirGPT-5 MiniLeader
AIMENot measured91.5%Only GPT-5 Mini measured
MATH 500 (Vals AI)Not measured94.8%Only GPT-5 Mini measured
MGSM (Vals AI)Not measured92.6%Only GPT-5 Mini measured
AA Math Index80.790.7GPT-5 Mini
AIME 2025 (Artificial Analysis run)80.7%90.7%GPT-5 Mini
OTIS Mock AIMENot measured86.7%Only GPT-5 Mini measured
FrontierMath, tiers 1 to 3Not measured46.7%Only GPT-5 Mini measured
FrontierMath, tier 4Not measured12.2%Only GPT-5 Mini measured
ProofBenchNot measured9.0%Only GPT-5 Mini measured
MATH level 5Not measured97.8%Only GPT-5 Mini measured
LMArena Text: math13961378GLM 4.5 Air
LMArena Text: mathematical work13961380GLM 4.5 Air
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index41
Knowledge benchmarks for GLM 4.5 Air and GPT-5 Mini
BenchmarkGLM 4.5 AirGPT-5 MiniLeader
MMLU ProNot measured82.2%Only GPT-5 Mini measured
LegalBench (Vals AI)Not measured81.8%Only GPT-5 Mini measured
CaseLaw (Vals AI)Not measured68.5%Only GPT-5 Mini measured
CorpFin (Vals AI)Not measured60.2%Only GPT-5 Mini measured
TaxEval (Vals AI)Not measured75.2%Only GPT-5 Mini measured
MortgageTax (Vals AI)Not measured66.9%Only GPT-5 Mini measured
MedQA (Vals AI)Not measured96.1%Only GPT-5 Mini measured
MedCode (Vals AI)Not measured43.0%Only GPT-5 Mini measured
MMLU Pro (Artificial Analysis run)81.5%83.7%GPT-5 Mini
SimpleQA VerifiedNot measured21.6%Only GPT-5 Mini measured
LMArena Text: science14071371GLM 4.5 Air
LMArena Text: medicine and healthcare14021380GLM 4.5 Air
LMArena Text: legal and government13821375GLM 4.5 Air
LMArena Text: business and finance13711358GLM 4.5 Air
FACTS Benchmark SuiteNot measured38.6%Only GPT-5 Mini measured
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index52
Web design benchmarks for GLM 4.5 Air and GPT-5 Mini
BenchmarkGLM 4.5 AirGPT-5 MiniLeader
Design Arena: websites11461125GLM 4.5 Air
Design Arena: UI components11231106GLM 4.5 Air
Design Arena: game dev10941130GPT-5 Mini
Design Arena: data viz11861130GLM 4.5 Air
Design Arena: 3D11231037GLM 4.5 Air
Design Arena: all code categories11371115GLM 4.5 Air
Design Arena: SVG10711091GPT-5 Mini
Design Arena: ASCII artNot measured1125Only GPT-5 Mini measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index145
General benchmarks for GLM 4.5 Air and GPT-5 Mini
BenchmarkGLM 4.5 AirGPT-5 MiniLeader
SAGE (Vals AI)Not measured43.0%Only GPT-5 Mini measured
MedScribe (Vals AI)Not measured80.6%Only GPT-5 Mini measured
IFBench37.6%75.4%GPT-5 Mini
Long context reasoning (AA-LCR)46.7%72.3%GPT-5 Mini
DTBenchNot measured80.5%Only GPT-5 Mini measured
LMCANot measured34.2%Only GPT-5 Mini measured
Fiction.LiveBenchNot measured69.4%Only GPT-5 Mini measured
Creative writing (Lech Mazur)Not measured83.1%Only GPT-5 Mini measured
LMArena Text13841373GLM 4.5 Air
LMArena Text: instruction following13541357GPT-5 Mini
LMArena Text: creative writing13431325GLM 4.5 Air
LMArena VisionNot measured1202Only GPT-5 Mini measured
LMArena Text: English13971379GLM 4.5 Air
LMArena Text: non-English13661363GLM 4.5 Air
LMArena Text: Chinese14261386GLM 4.5 Air
LMArena Text: German13771366GLM 4.5 Air
LMArena Text: Japanese13481341GLM 4.5 Air
LMArena Text: Korean13081308GLM 4.5 Air
LMArena Text: French14001386GLM 4.5 Air
LMArena Text: Spanish13851354GLM 4.5 Air
LMArena Text: Russian13731362GLM 4.5 Air
LMArena Text: Polish13681378GPT-5 Mini
LMArena Text: multi-turn13711363GLM 4.5 Air
LMArena Text: longer queries13661355GLM 4.5 Air
LMArena Text: writing and language13541344GLM 4.5 Air
LMArena Text: entertainment and media13391340GPT-5 Mini
LMArena Vision: EnglishNot measured1216Only GPT-5 Mini measured
LMArena Vision: ChineseNot measured1214Only GPT-5 Mini measured
LMArena Vision: reading textNot measured1199Only GPT-5 Mini measured
LMArena Vision: humorNot measured1205Only GPT-5 Mini measured
LMArena Vision: captioningNot measured1217Only GPT-5 Mini measured
LMArena Vision: recognizing thingsNot measured1226Only GPT-5 Mini measured
LMArena Vision: creative writingNot measured1181Only GPT-5 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 GPT-5 Mini
BenchmarkGLM 4.5 AirGPT-5 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
GPT-5 Mini$0.0013Fits 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
GPT-5 Mini$0.018Fits 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
GPT-5 Mini$0.070Fits in one request

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 GPT-5 Mini
SpecificationZ.ai GLM 4.5 AirOpenAI GPT-5 Mini
MakerZ.aiOpenAI
WeightsOpen weightsNo public weights listed
ReleasedJuly 25, 2025August 7, 2025
Context window131K400K
Input $/Mtok$0.20$0.25
Output $/Mtok$1.10$2.00
Coding indexNot benchmarked34.2
Independent measurements behind it02
Cost per solved taskNot computable$0.08
SourceOpenRouter listingOpenRouter listing

Questions

Is GLM 4.5 Air better than GPT-5 Mini for coding?

Only GPT-5 Mini has a coding score, 34.2 on the Vibe Coding Index; GLM 4.5 Air has none, so the two cannot be ranked on coding. Pick GLM 4.5 Air for output tokens 1.8x cheaper ($1.10 vs $2.00 per million) and work measured by LMArena Text: software and IT or LMArena Text: hard prompts in English, where it leads.

Which is cheaper, GLM 4.5 Air or GPT-5 Mini?

GLM 4.5 Air costs $0.20 per million input tokens and $1.10 per million output tokens; GPT-5 Mini costs $0.25 and $2.00. Cost per solved task is known for GPT-5 Mini only.

Which has the bigger context window, GLM 4.5 Air or GPT-5 Mini?

GPT-5 Mini, with 400K tokens against 131K.

How many benchmarks is the GLM 4.5 Air vs GPT-5 Mini comparison based on?

47 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 GPT-5 Mini's on 2. Where only one model has a result, the page says so instead of naming a winner.

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