GLM 5.3 vs Muse Ember
GLM 5.3 leads Muse Ember on coding, 68.5 to 64.9 on the Vibe Coding Index, and Muse Ember costs 8.8x less per output token ($0.50 vs $4.40 per million). Updated November 14, 2026; 15 benchmarks have a result for both.
GLM 5.3 or Muse Ember: which to pick
Pick GLM 5.3 for coding: it scores 68.5 on the Vibe Coding Index against 64.9 for Muse Ember.
Pick Muse Ember for output tokens 8.8x cheaper ($0.50 vs $4.40 per million) and work measured by Terminal-Bench 4 (Vals AI) or Vibe Code Bench (Vals AI), where it leads.
- Shared results
- 15
- GLM 5.3 only
- 94
- Muse Ember only
- 0
- Like-for-like categories
- 5 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.
Coding
Vibe Coding Index, six public coding benchmarks
GLM 5.3
GLM 5.3 scores 68.5 against 64.9.
5 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only GLM 5.3 has a AA Intelligence Index result, 31.7.
Directional only
Agentic work
AA Agentic Index
No call
Only GLM 5.3 has a AA Agentic Index result, 53.1.
Directional only
Reasoning
GPQA Diamond
No call
Only GLM 5.3 has a GPQA Diamond result, 88.1%.
Directional only
Knowledge
MMLU Pro
No call
Only GLM 5.3 has a MMLU Pro result, 86.8%.
Directional only
Web design
Design Arena: websites
No call
Only GLM 5.3 has a Design Arena: websites result, 1279.
Directional only
General
Vals Index
Muse Ember
Muse Ember leads, 60.5% against 59.9%.
Same board, both measured
Long documents
Listed context window
No call
Both take 1.05M tokens.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Muse Ember
GLM 5.3 $0.0036, Muse Ember $0.0003 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only GLM 5.3 has the number, $0.36.
Directional only
At a glance
- Coding index
- GLM 5.3 68.5 from 5 benchmarks, Muse Ember 64.9 from 3 benchmarks.
- Widest category
- Reasoning, 6.4 points apart on average over 2 shared benchmarks.
- Widest single gap
- Harvey's Legal Agent Benchmark (Vals AI): GLM 5.3 14.6% against Muse Ember 25.0%, 10.4 points apart on a 0 to 100 scale.
- Output price
- GLM 5.3 $4.40 against Muse Ember $0.50 per million output tokens, 8.8x apart.
- Context window
- Both take 1.05M tokens.
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.
| Category | GLM 5.3 | Bars | Muse Ember | Ties |
|---|---|---|---|---|
| Coding | 3 | 4 | ||
| Agentic work | 1 | 2 | 1 tie | |
| Reasoning | 0 | 2 | ||
| Knowledge | 0 | 1 | ||
| General | 0 | 1 | ||
| All shared boards | 4 | 10 | 1 tie |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index34
| Benchmark | GLM 5.3 | Muse Ember | Leader |
|---|---|---|---|
| LMArena WebDev | 1622 | 1609 | GLM 5.3 |
| AA Coding Index | 74.8 | Not measured | Only GLM 5.3 measured |
| LiveCodeBench (Vals AI) | 80.5% | Not measured | Only GLM 5.3 measured |
| SWE-bench Verified (Vals AI) | 95.4% | Not measured | Only GLM 5.3 measured |
| Terminal-Bench 4 (Vals AI) | 38.9% | 39.4% | Muse Ember |
| Vibe Code Bench (Vals AI) | 78.1% | 83.7% | Muse Ember |
| Code migration (Vals AI) | 44.2% | Not measured | Only GLM 5.3 measured |
| ProgramBench (Vals AI) | 1.5% | Not measured | Only GLM 5.3 measured |
| IOI (Vals AI) | 68.4% | Not measured | Only GLM 5.3 measured |
| Terminal-Bench 2.1 (Vals AI) | 71.5% | Not measured | Only GLM 5.3 measured |
| Vibe Code Bench 1-100 (Vals AI) | 20.0% | Not measured | Only GLM 5.3 measured |
| SkillsBench (Vals AI) | 47.5% | Not measured | Only GLM 5.3 measured |
| CyberBench (Vals AI) | 72.1% | Not measured | Only GLM 5.3 measured |
| SciCode | 59.0% | Not measured | Only GLM 5.3 measured |
| Terminal-Bench 4.0 (Artificial Analysis run) | 41.9% | 40.9% | GLM 5.3 |
| FrontierCode 2.0 | 21.6% | 27.2% | Muse Ember |
| FrontierCode | 40.1% | Not measured | Only GLM 5.3 measured |
| FrontierSWE | 30.2% | Not measured | Only GLM 5.3 measured |
| WeirdML | 75.4% | Not measured | Only GLM 5.3 measured |
| ALE-Bench | 1317.4 | Not measured | Only GLM 5.3 measured |
| LMArena Text: coding | 1499 | Not measured | Only GLM 5.3 measured |
| LMArena Text: software and IT | 1495 | Not measured | Only GLM 5.3 measured |
| LMArena WebDev: React | 1642 | 1616 | GLM 5.3 |
| LMArena WebDev: HTML | 1596 | 1621 | Muse Ember |
| SWE-Bench Pro V2 | 95.6% | Not measured | Only GLM 5.3 measured |
| GameBench 2 | 72.3 | Not measured | Only GLM 5.3 measured |
| Terminal-Bench 3.0 | 32.4% | Not measured | Only GLM 5.3 measured |
| Terminal-Bench 4.0 | 41.8% | Not measured | Only GLM 5.3 measured |
| CursorBench 4.0 | 42.6% | Not measured | Only GLM 5.3 measured |
| Neither model has a result on the other 23 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
| Benchmark | GLM 5.3 | Muse Ember | Leader |
|---|---|---|---|
| AA Intelligence Index | 31.7 | Not measured | Only GLM 5.3 measured |
| Epoch Capabilities Index | 157.1 | Not measured | Only GLM 5.3 measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index12
| Benchmark | GLM 5.3 | Muse Ember | Leader |
|---|---|---|---|
| AA Agentic Index | 53.1 | Not measured | Only GLM 5.3 measured |
| Design Arena: agents building web apps | 1270 | Not measured | Only GLM 5.3 measured |
| Design Arena: agents building mobile apps | 1184 | Not measured | Only GLM 5.3 measured |
| Design Arena: HTML slides | 1189 | Not measured | Only GLM 5.3 measured |
| Design Arena: PowerPoint slides | 1217 | Not measured | Only GLM 5.3 measured |
| SREBench (Vals AI) | 9.2% | Not measured | Only GLM 5.3 measured |
| Finance Agent (Vals AI) | 55.8% | Not measured | Only GLM 5.3 measured |
| Tax Agent Bench (Vals AI) | 43.3% | 38.2% | GLM 5.3 |
| Legal Research Bench (Vals AI) | 49.0% | 49.0% | Tie |
| Harvey's Legal Agent Benchmark (Vals AI) | 14.6% | 25.0% | Muse Ember |
| Excel Modeling Benchmark (Vals AI) | 56.3% | Not measured | Only GLM 5.3 measured |
| Terminal-Bench-Science (Vals AI) | 5.7% | Not measured | Only GLM 5.3 measured |
| APEX-Agents | 56.6% | 64.3% | Muse Ember |
| PostTrainBench | 34.5% | Not measured | Only GLM 5.3 measured |
| Vending-Bench 2 | $8,164 | Not measured | Only GLM 5.3 measured |
| MCP Atlas | 84.2% | Not measured | Only GLM 5.3 measured |
| Neither model has a result on the other 28 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | GLM 5.3 | Muse Ember | Leader |
|---|---|---|---|
| GPQA Diamond | 88.1% | Not measured | Only GLM 5.3 measured |
| MysteryMechanism (Vals AI) | 23.0% | Not measured | Only GLM 5.3 measured |
| GPQA Diamond (Artificial Analysis run) | 91.7% | Not measured | Only GLM 5.3 measured |
| Humanity's Last Exam (Artificial Analysis run) | 42.3% | Not measured | Only GLM 5.3 measured |
| HLE-Diamond (Artificial Analysis run) | 17.9% | 25.1% | Muse Ember |
| CritPt v2, hard subset (Artificial Analysis run) | 33.5% | 39.0% | Muse Ember |
| GPQA Diamond (Epoch AI run) | 90.9% | Not measured | Only GLM 5.3 measured |
| SimpleBench | 66.2% | Not measured | Only GLM 5.3 measured |
| Chess puzzles | 37.0% | Not measured | Only GLM 5.3 measured |
| Mystery game puzzles | 33.0% | Not measured | Only GLM 5.3 measured |
| LMArena Text: hard prompts | 1493 | Not measured | Only GLM 5.3 measured |
| LMArena Text: expert | 1519 | Not measured | Only GLM 5.3 measured |
| LMArena Text: hard prompts in English | 1500 | Not measured | Only GLM 5.3 measured |
| Humanity's Last Exam (Scale run) | 16.4% | Not measured | Only GLM 5.3 measured |
| Neither model has a result on the other 12 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared
| Benchmark | GLM 5.3 | Muse Ember | Leader |
|---|---|---|---|
| OTIS Mock AIME | 91.1% | Not measured | Only GLM 5.3 measured |
| FrontierMath, tiers 1 to 3 | 68.8% | Not measured | Only GLM 5.3 measured |
| FrontierMath, tier 4 | 29.3% | Not measured | Only GLM 5.3 measured |
| ProofBench | 49.0% | Not measured | Only GLM 5.3 measured |
| LMArena Text: math | 1500 | Not measured | Only GLM 5.3 measured |
| LMArena Text: mathematical work | 1502 | Not measured | Only GLM 5.3 measured |
| Neither model has a result on the other 8 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | GLM 5.3 | Muse Ember | Leader |
|---|---|---|---|
| MMLU Pro | 86.8% | Not measured | Only GLM 5.3 measured |
| LegalBench (Vals AI) | 84.8% | Not measured | Only GLM 5.3 measured |
| TaxEval (Vals AI) | 72.4% | Not measured | Only GLM 5.3 measured |
| MedCode (Vals AI) | 42.9% | Not measured | Only GLM 5.3 measured |
| AA-Omniscience | 6.0 | 7.7 | Muse Ember |
| SimpleQA Verified | 41.0% | Not measured | Only GLM 5.3 measured |
| LMArena Text: science | 1499 | Not measured | Only GLM 5.3 measured |
| LMArena Text: medicine and healthcare | 1483 | Not measured | Only GLM 5.3 measured |
| LMArena Text: legal and government | 1481 | Not measured | Only GLM 5.3 measured |
| LMArena Text: business and finance | 1461 | Not measured | Only GLM 5.3 measured |
| Neither model has a result on the other 11 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
| Benchmark | GLM 5.3 | Muse Ember | Leader |
|---|---|---|---|
| Design Arena: websites | 1279 | Not measured | Only GLM 5.3 measured |
| Design Arena: UI components | 1284 | Not measured | Only GLM 5.3 measured |
| Design Arena: game dev | 1289 | Not measured | Only GLM 5.3 measured |
| Design Arena: data viz | 1251 | Not measured | Only GLM 5.3 measured |
| Design Arena: 3D | 1295 | Not measured | Only GLM 5.3 measured |
| Design Arena: all code categories | 1284 | Not measured | Only GLM 5.3 measured |
| Design Arena: SVG | 1246 | Not measured | Only GLM 5.3 measured |
| Design Arena: ASCII art | 1208 | Not measured | Only GLM 5.3 measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | GLM 5.3 | Muse Ember | Leader |
|---|---|---|---|
| Vals Index | 59.9% | 60.5% | Muse Ember |
| Public Benefits Bench (Vals AI) | 68.5% | Not measured | Only GLM 5.3 measured |
| MedScribe (Vals AI) | 88.8% | Not measured | Only GLM 5.3 measured |
| Long context reasoning (AA-LCR) | 79.7% | Not measured | Only GLM 5.3 measured |
| GDPval-AA | 1655 | Not measured | Only GLM 5.3 measured |
| DTBench | 87.7% | Not measured | Only GLM 5.3 measured |
| LMCA | 55.5% | Not measured | Only GLM 5.3 measured |
| LMArena Text | 1475 | Not measured | Only GLM 5.3 measured |
| LMArena Text: instruction following | 1483 | Not measured | Only GLM 5.3 measured |
| LMArena Text: creative writing | 1459 | Not measured | Only GLM 5.3 measured |
| LMArena Text: English | 1483 | Not measured | Only GLM 5.3 measured |
| LMArena Text: non-English | 1462 | Not measured | Only GLM 5.3 measured |
| LMArena Text: Chinese | 1535 | Not measured | Only GLM 5.3 measured |
| LMArena Text: German | 1497 | Not measured | Only GLM 5.3 measured |
| LMArena Text: Japanese | 1470 | Not measured | Only GLM 5.3 measured |
| LMArena Text: Korean | 1440 | Not measured | Only GLM 5.3 measured |
| LMArena Text: French | 1498 | Not measured | Only GLM 5.3 measured |
| LMArena Text: Spanish | 1467 | Not measured | Only GLM 5.3 measured |
| LMArena Text: Russian | 1472 | Not measured | Only GLM 5.3 measured |
| LMArena Text: Polish | 1463 | Not measured | Only GLM 5.3 measured |
| LMArena Text: multi-turn | 1474 | Not measured | Only GLM 5.3 measured |
| LMArena Text: longer queries | 1486 | Not measured | Only GLM 5.3 measured |
| LMArena Text: writing and language | 1468 | Not measured | Only GLM 5.3 measured |
| LMArena Text: entertainment and media | 1447 | Not measured | Only GLM 5.3 measured |
| Neither model has a result on the other 25 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GLM 5.3 | Muse Ember | Leader |
|---|---|---|---|
| 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
Muse Ember costs less
Repository review
50K input + 3K output tokens
Muse Ember costs less
Agent loop
200K input + 10K output tokens
Muse Ember 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.
| Specification | Z.ai GLM 5.3 | Meta Muse Ember |
|---|---|---|
| Maker | Z.ai | Meta |
| Weights | Open weights | No public weights listed |
| Released | August 18, 2026 | November 9, 2026 |
| Context window | 1.05M | 1.05M |
| Input $/Mtok | $1.40 | $0.10 |
| Output $/Mtok | $4.40 | $0.50 |
| Coding index | 68.5 | 64.9 |
| Independent measurements behind it | 5 | 3 |
| Cost per solved task | $0.36 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GLM 5.3 better than Muse Ember for coding?
Pick GLM 5.3 for coding: it scores 68.5 on the Vibe Coding Index against 64.9 for Muse Ember. Pick Muse Ember for output tokens 8.8x cheaper ($0.50 vs $4.40 per million) and work measured by Terminal-Bench 4 (Vals AI) or Vibe Code Bench (Vals AI), where it leads.
Which is cheaper, GLM 5.3 or Muse Ember?
GLM 5.3 costs $1.40 per million input tokens and $4.40 per million output tokens; Muse Ember costs $0.10 and $0.50. Cost per solved task is known for GLM 5.3 only.
Which has the bigger context window, GLM 5.3 or Muse Ember?
Neither: both take 1.05M tokens.
How many benchmarks is the GLM 5.3 vs Muse Ember comparison based on?
15 benchmarks have a result for both models as of November 14, 2026. GLM 5.3's coding index rests on 5 independent benchmarks and Muse Ember's on 3. Where only one model has a result, the page says so instead of naming a winner.