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GLM 5.1 vs Nemotron 3 Ultra

GLM 5.1 leads Nemotron 3 Ultra on coding, 49.2 to 30.0 on the Vibe Coding Index, and Nemotron 3 Ultra costs 1.8x less per output token ($2.40 vs $4.40 per million). Updated October 22, 2026; 66 benchmarks have a result for both.

Replace GLM 5.1 Replace Nemotron 3 Ultra
GLM 5.1Z.ai
Coding
49.2
Overall
57.5
Output $/M
$4.40
57
Nemotron 3 UltraNVIDIA
Coding
30.0
Overall
53.1
Output $/M
$2.40
8
vs boards won of 66 shared, 1 tied

GLM 5.1 or Nemotron 3 Ultra: which to pick

Pick GLM 5.1 for coding: it scores 49.2 on the Vibe Coding Index against 30.0 for Nemotron 3 Ultra.

Pick Nemotron 3 Ultra for output tokens 1.8x cheaper ($2.40 vs $4.40 per million) and a larger context window (262K against 205K tokens).

Model AGLM 5.1Z.ai49.2/1003 independent benchmarks$0.60 per solved taskModel BNemotron 3 UltraNVIDIA30.0/1003 independent benchmarksNo cost per solved task
Shared results
66
GLM 5.1 only
25
Nemotron 3 Ultra only
5
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 5.1 49.2 from 3 benchmarks, Nemotron 3 Ultra 30.0 from 3 benchmarks.
Widest category
Web design, 18.3 points apart on average over 8 shared benchmarks.
Widest single gap
Design Arena: data viz: GLM 5.1 1366 against Nemotron 3 Ultra 1141, 28.1 points apart on a 0 to 100 scale.
Output price
GLM 5.1 $4.40 against Nemotron 3 Ultra $2.40 per million output tokens, 1.8x apart.
Context window
GLM 5.1 takes 205K tokens, Nemotron 3 Ultra 262K.

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 5.1BarsNemotron 3 UltraTies
Coding1011 tie
Intelligence20
Agentic work60
Reasoning61
Math40
Knowledge72
Web design80
General144
All shared boards5781 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index101
Coding benchmarks for GLM 5.1 and Nemotron 3 Ultra
BenchmarkGLM 5.1Nemotron 3 UltraLeader
LMArena WebDev1508Not measuredOnly GLM 5.1 measured
AA Coding Index55.849.3GLM 5.1
LiveCodeBench (Vals AI)81.4%86.0%Nemotron 3 Ultra
SWE-bench Verified (Vals AI)76.4%69.0%GLM 5.1
Vibe Code Bench (Vals AI)31.5%7.6%GLM 5.1
Code migration (Vals AI)25.8%4.9%GLM 5.1
ProgramBench (Vals AI)0.0%0.0%Tie
Terminal-Bench 2.1 (Vals AI)56.9%50.9%GLM 5.1
SciCode44.8%40.3%GLM 5.1
Terminal-Bench Hard (Artificial Analysis run)43.2%36.4%GLM 5.1
FrontierCodeNot measured13.6%Only Nemotron 3 Ultra measured
WeirdML57.1%43.5%GLM 5.1
ALE-Bench887.1Not measuredOnly GLM 5.1 measured
LMArena Text: coding14851468GLM 5.1
LMArena Text: software and IT14841468GLM 5.1
LMArena WebDev: React1505Not measuredOnly GLM 5.1 measured
LMArena WebDev: HTML1508Not measuredOnly GLM 5.1 measured
Neither model has a result on the other 26 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GLM 5.1 and Nemotron 3 Ultra
BenchmarkGLM 5.1Nemotron 3 UltraLeader
AA Intelligence Index26.122.9GLM 5.1
Epoch Capabilities Index149.8146.0GLM 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index60
Agentic work benchmarks for GLM 5.1 and Nemotron 3 Ultra
BenchmarkGLM 5.1Nemotron 3 UltraLeader
AA Agentic Index23.920.1GLM 5.1
Design Arena: agents building web apps1175Not measuredOnly GLM 5.1 measured
Design Arena: agents building full-stack apps1167Not measuredOnly GLM 5.1 measured
Design Arena: agents building mobile apps1160Not measuredOnly GLM 5.1 measured
Design Arena: agents building Android apps1181Not measuredOnly GLM 5.1 measured
Design Arena: agents building Godot games1053Not measuredOnly GLM 5.1 measured
Design Arena: agents building games1164Not measuredOnly GLM 5.1 measured
Design Arena: HTML slides1109Not measuredOnly GLM 5.1 measured
Design Arena: PowerPoint slides1162Not measuredOnly GLM 5.1 measured
Design Arena: spreadsheets1315Not measuredOnly GLM 5.1 measured
Finance Agent (Vals AI)44.8%37.7%GLM 5.1
Legal Research Bench (Vals AI)27.9%15.4%GLM 5.1
Excel Modeling Benchmark (Vals AI)Not measured31.7%Only Nemotron 3 Ultra measured
τ²-Bench Telecom97.7%83.3%GLM 5.1
APEX-Agents40.9%22.7%GLM 5.1
Vending-Bench 2$5,634Not measuredOnly GLM 5.1 measured
MCP Atlas75.6%63.1%GLM 5.1
Neither model has a result on the other 25 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index61
Reasoning benchmarks for GLM 5.1 and Nemotron 3 Ultra
BenchmarkGLM 5.1Nemotron 3 UltraLeader
GPQA Diamond84.5%86.1%Nemotron 3 Ultra
GPQA Diamond (Artificial Analysis run)86.8%86.7%GLM 5.1
Humanity's Last Exam (Artificial Analysis run)30.1%28.4%GLM 5.1
GPQA Diamond (Epoch AI run)89.9%85.4%GLM 5.1
SimpleBench55.1%Not measuredOnly GLM 5.1 measured
Chess puzzles20.0%Not measuredOnly GLM 5.1 measured
Mystery game puzzlesNot measured20.0%Only Nemotron 3 Ultra measured
LMArena Text: hard prompts14731452GLM 5.1
LMArena Text: expert14781472GLM 5.1
LMArena Text: hard prompts in English14821453GLM 5.1
Neither model has a result on the other 13 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index40
Math benchmarks for GLM 5.1 and Nemotron 3 Ultra
BenchmarkGLM 5.1Nemotron 3 UltraLeader
AIME91.9%Not measuredOnly GLM 5.1 measured
OTIS Mock AIME93.3%86.7%GLM 5.1
FrontierMath, tiers 1 to 336.8%Not measuredOnly GLM 5.1 measured
ProofBench22.2%2.0%GLM 5.1
LMArena Text: math14731457GLM 5.1
LMArena Text: mathematical work14701461GLM 5.1
MathArena20.1%Not measuredOnly GLM 5.1 measured
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index72
Knowledge benchmarks for GLM 5.1 and Nemotron 3 Ultra
BenchmarkGLM 5.1Nemotron 3 UltraLeader
MMLU Pro86.9%85.8%GLM 5.1
LegalBench (Vals AI)84.4%82.1%GLM 5.1
CaseLaw (Vals AI)51.5%Not measuredOnly GLM 5.1 measured
CorpFin (Vals AI)64.5%65.5%Nemotron 3 Ultra
TaxEval (Vals AI)71.2%73.1%Nemotron 3 Ultra
MedCode (Vals AI)41.6%38.6%GLM 5.1
SimpleQA Verified34.0%Not measuredOnly GLM 5.1 measured
LMArena Text: science14781465GLM 5.1
LMArena Text: medicine and healthcare14741456GLM 5.1
LMArena Text: legal and government14651452GLM 5.1
LMArena Text: business and finance14521434GLM 5.1
Neither model has a result on the other 9 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for GLM 5.1 and Nemotron 3 Ultra
BenchmarkGLM 5.1Nemotron 3 UltraLeader
Design Arena: websites12901145GLM 5.1
Design Arena: UI components12921135GLM 5.1
Design Arena: game dev12641138GLM 5.1
Design Arena: data viz13661141GLM 5.1
Design Arena: 3D13361131GLM 5.1
Design Arena: all code categories12681146GLM 5.1
Design Arena: SVG12171069GLM 5.1
Design Arena: ASCII art11411100GLM 5.1
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index144
General benchmarks for GLM 5.1 and Nemotron 3 Ultra
BenchmarkGLM 5.1Nemotron 3 UltraLeader
Public Benefits Bench (Vals AI)61.8%Not measuredOnly GLM 5.1 measured
MedScribe (Vals AI)72.3%Not measuredOnly GLM 5.1 measured
IFBench76.3%81.4%Nemotron 3 Ultra
Long context reasoning (AA-LCR)73.7%79.3%Nemotron 3 Ultra
DTBenchNot measured90.1%Only Nemotron 3 Ultra measured
LMCANot measured36.9%Only Nemotron 3 Ultra measured
ExploitBench18.1%Not measuredOnly GLM 5.1 measured
LMArena Text14631445GLM 5.1
LMArena Text: instruction following14531418GLM 5.1
LMArena Text: creative writing14531399GLM 5.1
LMArena Text: English14761455GLM 5.1
LMArena Text: non-English14481427GLM 5.1
LMArena Text: Chinese15151497GLM 5.1
LMArena Text: German14671472Nemotron 3 Ultra
LMArena Text: Japanese1435Not measuredOnly GLM 5.1 measured
LMArena Text: Korean14241384GLM 5.1
LMArena Text: French14701472Nemotron 3 Ultra
LMArena Text: Spanish14681455GLM 5.1
LMArena Text: Russian14541417GLM 5.1
LMArena Text: Polish14491385GLM 5.1
LMArena Text: multi-turn14731411GLM 5.1
LMArena Text: longer queries14671437GLM 5.1
LMArena Text: writing and language14541406GLM 5.1
LMArena Text: entertainment and media14421397GLM 5.1
Neither model has a result on the other 24 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GLM 5.1 and Nemotron 3 Ultra
BenchmarkGLM 5.1Nemotron 3 UltraLeader
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 5.1$0.0036Fits in one request
Nemotron 3 Ultra$0.0018Fits in one request

Nemotron 3 Ultra costs less

Repository review

50K input + 3K output tokens

GLM 5.1$0.083Fits in one request
Nemotron 3 Ultra$0.037Fits in one request

Nemotron 3 Ultra costs less

Agent loop

200K input + 10K output tokens

GLM 5.1$0.324Exceeds the context window
Nemotron 3 Ultra$0.144Fits in one request

Nemotron 3 Ultra 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 5.1 and Nemotron 3 Ultra
SpecificationZ.ai GLM 5.1NVIDIA Nemotron 3 Ultra
MakerZ.aiNVIDIA
WeightsOpen weightsOpen weights
ReleasedApril 7, 2026June 4, 2026
Context window205K262K
Input $/Mtok$1.40$0.60
Output $/Mtok$4.40$2.40
Coding index49.230.0
Independent measurements behind it33
Cost per solved task$0.60Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GLM 5.1 better than Nemotron 3 Ultra for coding?

Pick GLM 5.1 for coding: it scores 49.2 on the Vibe Coding Index against 30.0 for Nemotron 3 Ultra. Pick Nemotron 3 Ultra for output tokens 1.8x cheaper ($2.40 vs $4.40 per million) and a larger context window (262K against 205K tokens).

Which is cheaper, GLM 5.1 or Nemotron 3 Ultra?

GLM 5.1 costs $1.40 per million input tokens and $4.40 per million output tokens; Nemotron 3 Ultra costs $0.60 and $2.40. Cost per solved task is known for GLM 5.1 only.

Which has the bigger context window, GLM 5.1 or Nemotron 3 Ultra?

Nemotron 3 Ultra, with 262K tokens against 205K.

How many benchmarks is the GLM 5.1 vs Nemotron 3 Ultra comparison based on?

66 benchmarks have a result for both models as of October 22, 2026. GLM 5.1's coding index rests on 3 independent benchmarks and Nemotron 3 Ultra's on 3. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/glm-5-1-vs-nvidia-nemotron-3-ultra-550b-a55b">LLMBenchmark.ai, GLM 5.1 vs Nemotron 3 Ultra</a></p>