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GLM 4.5 Air vs GPT-5 Nano

GPT-5 Nano leads GLM 4.5 Air on the Artificial Analysis Intelligence Index, 13.0 to 11.1, and GPT-5 Nano costs 2.8x less per output token ($0.40 vs $1.10 per million). Updated October 22, 2026; 46 benchmarks have a result for both.

Replace GLM 4.5 Air Replace GPT-5 Nano
GLM 4.5 AirZ.ai
Coding
No data
Overall
No data
Output $/M
$1.10
38
GPT-5 NanoOpenAI
Coding
No data
Overall
35.6
Output $/M
$0.40
8
vs boards won of 46 shared

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

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

Pick GLM 4.5 Air for work measured by LiveCodeBench (Artificial Analysis run) or AA Intelligence Index, where it leads.

Model AGLM 4.5 AirZ.aiNot benchmarkedNo coding benchmarkNo cost per solved taskModel BGPT-5 NanoOpenAINot benchmarkedNo coding benchmark$0.109 per solved task
Shared results
46
GLM 4.5 Air only
3
GPT-5 Nano only
42
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 Nano not benchmarked.
Widest category
General, 11.3 points apart on average over 18 shared benchmarks.
Widest single gap
IFBench: GLM 4.5 Air 37.6% against GPT-5 Nano 67.6%, 30.0 points apart on a 0 to 100 scale.
Output price
GLM 4.5 Air $1.10 against GPT-5 Nano $0.40 per million output tokens, 2.8x apart.
Context window
GLM 4.5 Air takes 131K tokens, GPT-5 Nano 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 NanoTies
Coding31
Intelligence01
Agentic work10
Reasoning42
Math23
Knowledge50
Web design60
General171
All shared boards388
CodingLike-for-likeSix of these boards feed the Vibe Coding Index31
Coding benchmarks for GLM 4.5 Air and GPT-5 Nano
BenchmarkGLM 4.5 AirGPT-5 NanoLeader
SWE-bench VerifiedNot measured34.8%Only GPT-5 Nano measured
LiveCodeBench (Vals AI)Not measured70.2%Only GPT-5 Nano measured
LiveCodeBench (Artificial Analysis run)68.4%78.9%GPT-5 Nano
Terminal-Bench Hard (Artificial Analysis run)20.5%17.4%GLM 4.5 Air
Terminal-BenchNot measured21.8%Only GPT-5 Nano measured
GSO-Bench2.9%Not measuredOnly GLM 4.5 Air measured
WeirdMLNot measured38.1%Only GPT-5 Nano measured
LMArena Text: coding13971351GLM 4.5 Air
LMArena Text: software and IT14011345GLM 4.5 Air
Neither model has a result on the other 34 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for GLM 4.5 Air and GPT-5 Nano
BenchmarkGLM 4.5 AirGPT-5 NanoLeader
AA Intelligence Index11.113.0GPT-5 Nano
Epoch Capabilities IndexNot measured139.2Only GPT-5 Nano measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for GLM 4.5 Air and GPT-5 Nano
BenchmarkGLM 4.5 AirGPT-5 NanoLeader
τ²-Bench Telecom46.5%36.5%GLM 4.5 Air
Berkeley Function Calling Leaderboard (BFCL)Not measured51.4%Only GPT-5 Nano measured
Neither model has a result on the other 40 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index42
Reasoning benchmarks for GLM 4.5 Air and GPT-5 Nano
BenchmarkGLM 4.5 AirGPT-5 NanoLeader
GPQA DiamondNot measured63.4%Only GPT-5 Nano measured
MMMU Pro (Vals AI)Not measured70.9%Only GPT-5 Nano measured
GPQA Diamond (Artificial Analysis run)73.3%67.6%GLM 4.5 Air
Humanity's Last Exam (Artificial Analysis run)7.0%9.5%GPT-5 Nano
GPQA Diamond (Epoch AI run)Not measured69.4%Only GPT-5 Nano measured
ARC-AGINot measured20.7%Only GPT-5 Nano measured
ARC-AGI-2Not measured2.6%Only GPT-5 Nano measured
Chess puzzlesNot measured22.0%Only GPT-5 Nano measured
Mystery game puzzlesNot measured9.0%Only GPT-5 Nano measured
VPCTNot measured37.2%Only GPT-5 Nano measured
LMArena Text: hard prompts13791328GLM 4.5 Air
LMArena Text: expert13701321GLM 4.5 Air
LMArena Text: hard prompts in English13881338GLM 4.5 Air
LMArena Vision: diagramsNot measured1141Only GPT-5 Nano measured
LMArena Vision: homeworkNot measured1157Only GPT-5 Nano measured
Kagi LLM Benchmark43.0%62.2%GPT-5 Nano
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index23
Math benchmarks for GLM 4.5 Air and GPT-5 Nano
BenchmarkGLM 4.5 AirGPT-5 NanoLeader
AIMENot measured81.2%Only GPT-5 Nano measured
MATH 500 (Vals AI)Not measured93.8%Only GPT-5 Nano measured
MGSM (Vals AI)Not measured89.3%Only GPT-5 Nano measured
AA Math Index80.783.7GPT-5 Nano
AIME 2025 (Artificial Analysis run)80.7%83.7%GPT-5 Nano
OTIS Mock AIMENot measured81.1%Only GPT-5 Nano measured
FrontierMath, tiers 1 to 3Not measured20.0%Only GPT-5 Nano measured
FrontierMath, tier 4Not measured2.4%Only GPT-5 Nano measured
ProofBenchNot measured12.0%Only GPT-5 Nano measured
MATH level 5Not measured95.2%Only GPT-5 Nano measured
LMArena Text: math13961317GLM 4.5 Air
LMArena Text: mathematical work13961326GLM 4.5 Air
MathArena12.0%12.8%GPT-5 Nano
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index50
Knowledge benchmarks for GLM 4.5 Air and GPT-5 Nano
BenchmarkGLM 4.5 AirGPT-5 NanoLeader
MMLU ProNot measured76.1%Only GPT-5 Nano measured
LegalBench (Vals AI)Not measured50.1%Only GPT-5 Nano measured
CaseLaw (Vals AI)Not measured52.6%Only GPT-5 Nano measured
TaxEval (Vals AI)Not measured67.4%Only GPT-5 Nano measured
MortgageTax (Vals AI)Not measured53.6%Only GPT-5 Nano measured
MedQA (Vals AI)Not measured93.3%Only GPT-5 Nano measured
MedCode (Vals AI)Not measured30.4%Only GPT-5 Nano measured
MMLU Pro (Artificial Analysis run)81.5%78.0%GLM 4.5 Air
SimpleQA VerifiedNot measured11.7%Only GPT-5 Nano measured
LMArena Text: science14071318GLM 4.5 Air
LMArena Text: medicine and healthcare14021335GLM 4.5 Air
LMArena Text: legal and government13821298GLM 4.5 Air
LMArena Text: business and finance13711311GLM 4.5 Air
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for GLM 4.5 Air and GPT-5 Nano
BenchmarkGLM 4.5 AirGPT-5 NanoLeader
Design Arena: websites11461101GLM 4.5 Air
Design Arena: UI components11211064GLM 4.5 Air
Design Arena: game dev10931044GLM 4.5 Air
Design Arena: data viz11861056GLM 4.5 Air
Design Arena: 3D1122965GLM 4.5 Air
Design Arena: all code categories11371084GLM 4.5 Air
Design Arena: SVG1070Not 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 index171
General benchmarks for GLM 4.5 Air and GPT-5 Nano
BenchmarkGLM 4.5 AirGPT-5 NanoLeader
SAGE (Vals AI)Not measured30.4%Only GPT-5 Nano measured
MedScribe (Vals AI)Not measured72.9%Only GPT-5 Nano measured
IFBench37.6%67.6%GPT-5 Nano
Long context reasoning (AA-LCR)46.7%45.0%GLM 4.5 Air
DTBenchNot measured62.7%Only GPT-5 Nano measured
LMCANot measured7.9%Only GPT-5 Nano measured
Fiction.LiveBenchNot measured44.4%Only GPT-5 Nano measured
LMArena Text13841320GLM 4.5 Air
LMArena Text: instruction following13541306GLM 4.5 Air
LMArena Text: creative writing13431249GLM 4.5 Air
LMArena VisionNot measured1159Only GPT-5 Nano measured
LMArena Text: English13971321GLM 4.5 Air
LMArena Text: non-English13661313GLM 4.5 Air
LMArena Text: Chinese14261356GLM 4.5 Air
LMArena Text: German13771327GLM 4.5 Air
LMArena Text: Japanese13481227GLM 4.5 Air
LMArena Text: Korean13081269GLM 4.5 Air
LMArena Text: French1400Not measuredOnly GLM 4.5 Air measured
LMArena Text: Spanish13851360GLM 4.5 Air
LMArena Text: Russian13731296GLM 4.5 Air
LMArena Text: Polish13681314GLM 4.5 Air
LMArena Text: multi-turn13711311GLM 4.5 Air
LMArena Text: longer queries13661312GLM 4.5 Air
LMArena Text: writing and language13541283GLM 4.5 Air
LMArena Text: entertainment and media13391268GLM 4.5 Air
LMArena Vision: EnglishNot measured1170Only GPT-5 Nano measured
LMArena Vision: ChineseNot measured1176Only GPT-5 Nano measured
LMArena Vision: reading textNot measured1152Only GPT-5 Nano measured
LMArena Vision: humorNot measured1110Only GPT-5 Nano measured
Neither model has a result on the other 19 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 Nano
BenchmarkGLM 4.5 AirGPT-5 NanoLeader
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 Nano$0.0003Fits in one request

GPT-5 Nano costs less

Repository review

50K input + 3K output tokens

GLM 4.5 Air$0.013Fits in one request
GPT-5 Nano$0.0037Fits in one request

GPT-5 Nano costs less

Agent loop

200K input + 10K output tokens

GLM 4.5 Air$0.051Exceeds the context window
GPT-5 Nano$0.014Fits in one request

GPT-5 Nano 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 Nano
SpecificationZ.ai GLM 4.5 AirOpenAI GPT-5 Nano
MakerZ.aiOpenAI
WeightsOpen weightsNo public weights listed
ReleasedJuly 25, 2025August 7, 2025
Context window131K400K
Input $/Mtok$0.20$0.05
Output $/Mtok$1.10$0.40
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computable$0.109
SourceOpenRouter listingOpenRouter listing

Questions

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

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GLM 4.5 Air for work measured by LiveCodeBench (Artificial Analysis run) or AA Intelligence Index, where it leads.

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

GLM 4.5 Air costs $0.20 per million input tokens and $1.10 per million output tokens; GPT-5 Nano costs $0.05 and $0.40. Cost per solved task is known for GPT-5 Nano only.

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

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

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

46 benchmarks have a result for both models as of October 22, 2026. GLM 4.5 Air's coding index rests on 0 independent benchmarks and GPT-5 Nano's on 0. Where only one model has a result, the page says so instead of naming a winner.

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