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GLM 4.5V vs gpt-oss-20b

gpt-oss-20b leads GLM 4.5V on the Artificial Analysis Intelligence Index, 10.0 to 7.6, and gpt-oss-20b costs 12.0x less per output token ($0.15 vs $1.80 per million). Updated October 21, 2026; 36 benchmarks have a result for both.

Replace GLM 4.5V Replace gpt-oss-20b
GLM 4.5VZ.ai
Coding
No data
Overall
No data
Output $/M
$1.80
26
gpt-oss-20bOpenAI
Coding
No data
Overall
38.5
Output $/M
$0.15
10
vs boards won of 36 shared

GLM 4.5V or gpt-oss-20b: which to pick

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

Pick GLM 4.5V for work measured by LiveCodeBench (Artificial Analysis run) or Terminal-Bench Hard (Artificial Analysis run), where it leads.

Model AGLM 4.5VZ.aiNot benchmarkedNo coding benchmarkNo cost per solved taskModel Bgpt-oss-20bOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
36
GLM 4.5V only
5
gpt-oss-20b only
26
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
GLM 4.5V not benchmarked, gpt-oss-20b not benchmarked.
Widest category
Agentic work, 37.7 points apart on average over 1 shared benchmark.
Widest single gap
τ²-Bench Telecom: GLM 4.5V 22.5% against gpt-oss-20b 60.2%, 37.7 points apart on a 0 to 100 scale.
Output price
GLM 4.5V $1.80 against gpt-oss-20b $0.15 per million output tokens, 12.0x apart.
Context window
GLM 4.5V takes 66K tokens, gpt-oss-20b 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
CategoryGLM 4.5VBarsgpt-oss-20bTies
Coding22
Intelligence01
Agentic work01
Reasoning42
Math22
Knowledge50
General132
All shared boards2610
CodingLike-for-likeSix of these boards feed the Vibe Coding Index22
Coding benchmarks for GLM 4.5V and gpt-oss-20b
BenchmarkGLM 4.5Vgpt-oss-20bLeader
LiveCodeBench (Vals AI)Not measured80.4%Only gpt-oss-20b measured
LiveCodeBench (Artificial Analysis run)60.4%77.7%gpt-oss-20b
SciCodeNot measured38.9%Only gpt-oss-20b measured
Terminal-Bench Hard (Artificial Analysis run)6.8%10.6%gpt-oss-20b
Terminal-BenchNot measured3.4%Only gpt-oss-20b measured
WeirdMLNot measured40.9%Only gpt-oss-20b measured
ALE-BenchNot measured566.0Only gpt-oss-20b measured
LMArena Text: coding13471307GLM 4.5V
LMArena Text: software and IT13531311GLM 4.5V
Neither model has a result on the other 30 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for GLM 4.5V and gpt-oss-20b
BenchmarkGLM 4.5Vgpt-oss-20bLeader
AA Intelligence Index7.610.0gpt-oss-20b
Epoch Capabilities IndexNot measured137.7Only gpt-oss-20b measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for GLM 4.5V and gpt-oss-20b
BenchmarkGLM 4.5Vgpt-oss-20bLeader
τ²-Bench Telecom22.5%60.2%gpt-oss-20b
BrowseComp-PlusNot measured50.6%Only gpt-oss-20b measured
Neither model has a result on the other 39 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index42
Reasoning benchmarks for GLM 4.5V and gpt-oss-20b
BenchmarkGLM 4.5Vgpt-oss-20bLeader
GPQA DiamondNot measured68.9%Only gpt-oss-20b measured
GPQA Diamond (Artificial Analysis run)68.4%68.8%gpt-oss-20b
Humanity's Last Exam (Artificial Analysis run)6.3%11.0%gpt-oss-20b
GPQA Diamond (Epoch AI run)Not measured60.8%Only gpt-oss-20b measured
LMArena Text: hard prompts13351274GLM 4.5V
LMArena Text: expert13531258GLM 4.5V
LMArena Text: hard prompts in English13571292GLM 4.5V
LMArena Vision: diagrams1151Not measuredOnly GLM 4.5V measured
LMArena Vision: homework1163Not measuredOnly GLM 4.5V measured
Kagi LLM Benchmark59.8%53.2%GLM 4.5V
Neither model has a result on the other 12 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index22
Math benchmarks for GLM 4.5V and gpt-oss-20b
BenchmarkGLM 4.5Vgpt-oss-20bLeader
AIMENot measured86.0%Only gpt-oss-20b measured
MATH 500 (Vals AI)Not measured94.2%Only gpt-oss-20b measured
MGSM (Vals AI)Not measured89.0%Only gpt-oss-20b measured
AA Math Index73.089.3gpt-oss-20b
AIME 2025 (Artificial Analysis run)73.0%89.3%gpt-oss-20b
OTIS Mock AIMENot measured65.3%Only gpt-oss-20b measured
LMArena Text: math13541317GLM 4.5V
LMArena Text: mathematical work13361305GLM 4.5V
Neither model has a result on the other 5 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index50
Knowledge benchmarks for GLM 4.5V and gpt-oss-20b
BenchmarkGLM 4.5Vgpt-oss-20bLeader
MMLU ProNot measured71.6%Only gpt-oss-20b measured
LegalBench (Vals AI)Not measured70.8%Only gpt-oss-20b measured
CaseLaw (Vals AI)Not measured43.8%Only gpt-oss-20b measured
CorpFin (Vals AI)Not measured53.1%Only gpt-oss-20b measured
TaxEval (Vals AI)Not measured63.7%Only gpt-oss-20b measured
MedQA (Vals AI)Not measured82.9%Only gpt-oss-20b measured
MMLU Pro (Artificial Analysis run)78.8%74.8%GLM 4.5V
LMArena Text: science13301296GLM 4.5V
LMArena Text: medicine and healthcare13491310GLM 4.5V
LMArena Text: legal and government13381280GLM 4.5V
LMArena Text: business and finance13091284GLM 4.5V
Neither model has a result on the other 7 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
Web design benchmarks for GLM 4.5V and gpt-oss-20b
BenchmarkGLM 4.5Vgpt-oss-20bLeader
Design Arena: websitesNot measured852Only gpt-oss-20b measured
Design Arena: data vizNot measured933Only gpt-oss-20b measured
Neither model has a result on the other 7 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index132
General benchmarks for GLM 4.5V and gpt-oss-20b
BenchmarkGLM 4.5Vgpt-oss-20bLeader
IFBench34.2%65.1%gpt-oss-20b
Long context reasoning (AA-LCR)0.0%34.7%gpt-oss-20b
DTBenchNot measured68.0%Only gpt-oss-20b measured
LMCANot measured14.5%Only gpt-oss-20b measured
LMArena Text13331288GLM 4.5V
LMArena Text: instruction following13111236GLM 4.5V
LMArena Text: creative writing12941201GLM 4.5V
LMArena Vision1154Not measuredOnly GLM 4.5V measured
LMArena Text: English13621303GLM 4.5V
LMArena Text: non-English13031269GLM 4.5V
LMArena Text: Chinese13371315GLM 4.5V
LMArena Text: GermanNot measured1255Only gpt-oss-20b measured
LMArena Text: JapaneseNot measured1244Only gpt-oss-20b measured
LMArena Text: KoreanNot measured1236Only gpt-oss-20b measured
LMArena Text: Spanish13361267GLM 4.5V
LMArena Text: Russian12981278GLM 4.5V
LMArena Text: Polish13021252GLM 4.5V
LMArena Text: multi-turn13331268GLM 4.5V
LMArena Text: longer queries13051250GLM 4.5V
LMArena Text: writing and language13021238GLM 4.5V
LMArena Text: entertainment and media13031216GLM 4.5V
LMArena Vision: English1183Not measuredOnly GLM 4.5V measured
LMArena Vision: reading text1151Not measuredOnly GLM 4.5V measured
Neither model has a result on the other 23 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GLM 4.5V and gpt-oss-20b
BenchmarkGLM 4.5Vgpt-oss-20bLeader
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 4.5V$0.0015Fits in one request
gpt-oss-20b$0.0001Fits in one request

gpt-oss-20b costs less

Repository review

50K input + 3K output tokens

GLM 4.5V$0.035Fits in one request
gpt-oss-20b$0.0019Fits in one request

gpt-oss-20b costs less

Agent loop

200K input + 10K output tokens

GLM 4.5V$0.138Exceeds the context window
gpt-oss-20b$0.0075Exceeds the context window

gpt-oss-20b 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 4.5V and gpt-oss-20b
SpecificationZ.ai GLM 4.5VOpenAI gpt-oss-20b
MakerZ.aiOpenAI
WeightsOpen weightsOpen weights
ReleasedAugust 11, 2025August 5, 2025
Context window66K131K
Input $/Mtok$0.60$0.03
Output $/Mtok$1.80$0.15
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GLM 4.5V better than gpt-oss-20b for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GLM 4.5V for work measured by LiveCodeBench (Artificial Analysis run) or Terminal-Bench Hard (Artificial Analysis run), where it leads.

Which is cheaper, GLM 4.5V or gpt-oss-20b?

GLM 4.5V costs $0.60 per million input tokens and $1.80 per million output tokens; gpt-oss-20b costs $0.03 and $0.15. Cost per solved task is known for neither of them.

Which has the bigger context window, GLM 4.5V or gpt-oss-20b?

gpt-oss-20b, with 131K tokens against 66K.

How many benchmarks is the GLM 4.5V vs gpt-oss-20b comparison based on?

36 benchmarks have a result for both models as of October 21, 2026. GLM 4.5V's coding index rests on 0 independent benchmarks and gpt-oss-20b's on 0. Where only one model has a result, the page says so instead of naming a winner.

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