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GLM 5.1 vs o3 Mini

Updated October 21, 2026. 51 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GLM 5.1 Replace o3 Mini
GLM 5.1Z.ai
Coding
44.0
Overall
26.1
Output $/M
$4.40
51
o3 MiniOpenAI
Coding
52.1
Overall
12.5
Output $/M
$4.40
0
vs boards won of 51 shared

Decision reading

Pick o3 Mini for coding: it scores 52.1 on the Vibe Coding Index against 44.0 for GLM 5.1.

Pick GLM 5.1 when the context window is larger, 205K against 200K tokens, or when what matters is LiveCodeBench (Vals AI) or SciCode, where it leads.

Model AGLM 5.1Z.ai44.0/1001 independent benchmark$0.60 per solved taskModel Bo3 MiniOpenAI52.1/1002 independent benchmarksNo cost per solved task
Shared results
51
GLM 5.1 only
38
o3 Mini only
19
Like-for-like categories
7 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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 44.0 from 1 benchmark, o3 Mini 52.1 from 2 benchmarks.
Widest category
Agentic work, 66.4 points apart on average over 1 shared benchmark.
Widest single gap
τ²-Bench Telecom: GLM 5.1 97.7% against o3 Mini 31.3%, 66.4 points apart on a 0 to 100 scale.
Output price
Both cost $4.40 per million output tokens.
Context window
GLM 5.1 takes 205K tokens, o3 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 5.1Barso3 MiniTies
Coding60
Intelligence20
Agentic work10
Reasoning90
Math50
Knowledge90
General190
All shared boards510
CodingLike-for-likeFour of these boards feed the Vibe Coding Index60
Coding benchmarks for GLM 5.1 and o3 Mini
BenchmarkGLM 5.1o3 MiniLeader
Aider polyglotNot measured60.4%Only o3 Mini measured
SWE-bench VerifiedNot measured42.4%Only o3 Mini measured
SWE-bench LiteNot measured32.3%Only o3 Mini measured
LMArena WebDev1508Not measuredOnly GLM 5.1 measured
AA Coding Index55.8Not measuredOnly GLM 5.1 measured
LiveCodeBench (Vals AI)81.4%71.5%GLM 5.1
SWE-bench Verified (Vals AI)76.4%Not measuredOnly GLM 5.1 measured
Vibe Code Bench (Vals AI)31.5%Not measuredOnly GLM 5.1 measured
Code migration (Vals AI)25.8%Not measuredOnly GLM 5.1 measured
ProgramBench (Vals AI)0.0%Not measuredOnly GLM 5.1 measured
Terminal-Bench 2.1 (Vals AI)56.9%Not measuredOnly GLM 5.1 measured
LiveCodeBench (Artificial Analysis run)Not measured73.4%Only o3 Mini measured
SciCode44.8%42.8%GLM 5.1
Terminal-Bench Hard (Artificial Analysis run)43.2%6.8%GLM 5.1
GSO-BenchNot measured1.3%Only o3 Mini measured
WeirdML57.1%43.7%GLM 5.1
CybenchNot measured22.5%Only o3 Mini measured
ALE-Bench887.1Not measuredOnly GLM 5.1 measured
LMArena Text: coding14851378GLM 5.1
LMArena Text: software and IT14841364GLM 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 16 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GLM 5.1 and o3 Mini
BenchmarkGLM 5.1o3 MiniLeader
AA Intelligence Index26.112.5GLM 5.1
Epoch Capabilities Index149.8140.2GLM 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for GLM 5.1 and o3 Mini
BenchmarkGLM 5.1o3 MiniLeader
AA Agentic Index23.9Not measuredOnly GLM 5.1 measured
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 apps1162Not measuredOnly GLM 5.1 measured
Design Arena: agents building Android apps1186Not 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 slides1170Not measuredOnly GLM 5.1 measured
Design Arena: PowerPoint slides1189Not measuredOnly GLM 5.1 measured
Design Arena: spreadsheets1315Not measuredOnly GLM 5.1 measured
Finance Agent (Vals AI)44.8%Not measuredOnly GLM 5.1 measured
Legal Research Bench (Vals AI)27.9%Not measuredOnly GLM 5.1 measured
τ²-Bench Telecom97.7%31.3%GLM 5.1
APEX-Agents40.9%Not measuredOnly GLM 5.1 measured
Vending-Bench 2$5,634Not measuredOnly GLM 5.1 measured
Neither model has a result on the other 24 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index90
Reasoning benchmarks for GLM 5.1 and o3 Mini
BenchmarkGLM 5.1o3 MiniLeader
GPQA Diamond84.5%75.5%GLM 5.1
GPQA Diamond (Artificial Analysis run)86.8%77.3%GLM 5.1
Humanity's Last Exam (Artificial Analysis run)30.1%12.0%GLM 5.1
GPQA Diamond (Epoch AI run)89.9%77.0%GLM 5.1
ARC-AGINot measured34.5%Only o3 Mini measured
ARC-AGI-2Not measured3.0%Only o3 Mini measured
SimpleBench55.1%22.8%GLM 5.1
Chess puzzles20.0%15.0%GLM 5.1
Mystery game puzzlesNot measured7.0%Only o3 Mini measured
LMArena Text: hard prompts14731365GLM 5.1
LMArena Text: expert14781364GLM 5.1
LMArena Text: hard prompts in English14821375GLM 5.1
Neither model has a result on the other 9 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index50
Math benchmarks for GLM 5.1 and o3 Mini
BenchmarkGLM 5.1o3 MiniLeader
AIME91.9%86.5%GLM 5.1
MATH 500 (Vals AI)Not measured91.8%Only o3 Mini measured
MGSM (Vals AI)Not measured91.3%Only o3 Mini measured
OTIS Mock AIME93.3%76.9%GLM 5.1
FrontierMath, tiers 1 to 336.8%18.6%GLM 5.1
FrontierMath, tier 4Not measured0.0%Only o3 Mini measured
ProofBench22.2%Not measuredOnly GLM 5.1 measured
MATH level 5Not measured96.5%Only o3 Mini measured
LMArena Text: math14731396GLM 5.1
LMArena Text: mathematical work14701399GLM 5.1
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index90
Knowledge benchmarks for GLM 5.1 and o3 Mini
BenchmarkGLM 5.1o3 MiniLeader
MMLU Pro86.9%78.7%GLM 5.1
LegalBench (Vals AI)84.4%71.5%GLM 5.1
CaseLaw (Vals AI)51.5%Not measuredOnly GLM 5.1 measured
CorpFin (Vals AI)64.5%45.3%GLM 5.1
TaxEval (Vals AI)71.2%69.4%GLM 5.1
MedQA (Vals AI)Not measured94.8%Only o3 Mini measured
MedCode (Vals AI)41.6%Not measuredOnly GLM 5.1 measured
MMLU Pro (Artificial Analysis run)Not measured80.2%Only o3 Mini measured
SimpleQA Verified34.0%15.3%GLM 5.1
LMArena Text: science14781339GLM 5.1
LMArena Text: medicine and healthcare14741330GLM 5.1
LMArena Text: legal and government14651328GLM 5.1
LMArena Text: business and finance14521313GLM 5.1
Neither model has a result on the other 4 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for GLM 5.1 and o3 Mini
BenchmarkGLM 5.1o3 MiniLeader
Design Arena: websites1290Not measuredOnly GLM 5.1 measured
Design Arena: UI components1292Not measuredOnly GLM 5.1 measured
Design Arena: game dev1265Not measuredOnly GLM 5.1 measured
Design Arena: data viz1366Not measuredOnly GLM 5.1 measured
Design Arena: 3D1336Not measuredOnly GLM 5.1 measured
Design Arena: all code categories1268Not measuredOnly GLM 5.1 measured
Design Arena: SVG1217Not measuredOnly GLM 5.1 measured
Design Arena: ASCII art1142Not measuredOnly GLM 5.1 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index190
General benchmarks for GLM 5.1 and o3 Mini
BenchmarkGLM 5.1o3 MiniLeader
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%67.1%GLM 5.1
Long context reasoning (AA-LCR)73.7%43.0%GLM 5.1
DTBenchNot measured68.8%Only o3 Mini measured
LMCANot measured19.0%Only o3 Mini measured
Fiction.LiveBenchNot measured50.0%Only o3 Mini measured
Creative writing (Lech Mazur)Not measured61.7%Only o3 Mini measured
ExploitBench18.1%Not measuredOnly GLM 5.1 measured
LMArena Text14631337GLM 5.1
LMArena Text: instruction following14531337GLM 5.1
LMArena Text: creative writing14531286GLM 5.1
LMArena Text: English14761351GLM 5.1
LMArena Text: non-English14481319GLM 5.1
LMArena Text: Chinese15151379GLM 5.1
LMArena Text: German14671303GLM 5.1
LMArena Text: Japanese14351286GLM 5.1
LMArena Text: Korean14241313GLM 5.1
LMArena Text: French14701334GLM 5.1
LMArena Text: Spanish14681321GLM 5.1
LMArena Text: Russian14541304GLM 5.1
LMArena Text: Polish14491294GLM 5.1
LMArena Text: multi-turn14731320GLM 5.1
LMArena Text: longer queries14671343GLM 5.1
LMArena Text: writing and language14541313GLM 5.1
LMArena Text: entertainment and media14421283GLM 5.1
Neither model has a result on the other 20 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 o3 Mini
BenchmarkGLM 5.1o3 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 5.1$0.0036Fits in one request
o3 Mini$0.0033Fits in one request

o3 Mini costs less

Repository review

50K input + 3K output tokens

GLM 5.1$0.083Fits in one request
o3 Mini$0.068Fits in one request

o3 Mini costs less

Agent loop

200K input + 10K output tokens

GLM 5.1$0.324Exceeds the context window
o3 Mini$0.264Exceeds the context window

o3 Mini 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 o3 Mini
SpecificationZ.ai GLM 5.1OpenAI o3 Mini
MakerZ.aiOpenAI
WeightsOpen weightsNo public weights listed
ReleasedApril 7, 2026January 31, 2025
Context window205K200K
Input $/Mtok$1.40$1.10
Output $/Mtok$4.40$4.40
Coding index44.052.1
Independent measurements behind it12
Cost per solved task$0.60Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GLM 5.1 better than o3 Mini for coding?

Pick o3 Mini for coding: it scores 52.1 on the Vibe Coding Index against 44.0 for GLM 5.1. Pick GLM 5.1 when the context window is larger, 205K against 200K tokens, or when what matters is LiveCodeBench (Vals AI) or SciCode, where it leads.

Which is cheaper, GLM 5.1 or o3 Mini?

GLM 5.1 costs $1.40 per million input tokens and $4.40 per million output tokens; o3 Mini costs $1.10 and $4.40. Cost per solved task is known for GLM 5.1 only.

Which has the bigger context window, GLM 5.1 or o3 Mini?

GLM 5.1, with 205K tokens against 200K.

How many benchmarks is the GLM 5.1 vs o3 Mini comparison based on?

51 benchmarks have a result for both models as of October 21, 2026. GLM 5.1's coding index rests on 1 independent benchmark and o3 Mini's on 2. Where only one model has a result, the page says so instead of naming a winner.

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