Ember-1 vs GLM 5.1
Updated October 21, 2026. 5 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
Decision reading
Pick Ember-1 for coding: it scores 52.6 on the Vibe Coding Index against 49.2 for GLM 5.1, though on 2 benchmarks against 3.
Pick GLM 5.1 when output tokens cost 3.4x less.
- Shared results
- 5
- Ember-1 only
- 9
- GLM 5.1 only
- 84
- Like-for-like categories
- 3 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.
Coding
Vibe Coding Index, six public coding benchmarks
Ember-1
Ember-1 scores 52.6 against 49.2.
2 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only GLM 5.1 has a AA Intelligence Index result, 26.1.
Directional only
Agentic work
AA Agentic Index
No call
Only GLM 5.1 has a AA Agentic Index result, 23.9.
Directional only
Reasoning
GPQA Diamond
No call
Only GLM 5.1 has a GPQA Diamond result, 84.5%.
Directional only
Math
AIME
No call
Only GLM 5.1 has a AIME result, 91.9%.
Directional only
Knowledge
MMLU Pro
No call
Only GLM 5.1 has a MMLU Pro result, 86.9%.
Directional only
Web design
Design Arena: websites
No call
Only GLM 5.1 has a Design Arena: websites result, 1290.
Directional only
Long documents
Listed context window
Ember-1
Ember-1 takes 1.05M tokens against 205K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
GLM 5.1
Ember-1 $0.011, GLM 5.1 $0.0036 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only GLM 5.1 has the number, $0.60.
Directional only
At a glance
- Coding index
- Ember-1 52.6 from 2 benchmarks, GLM 5.1 49.2 from 3 benchmarks.
- Widest category
- Coding, 29.6 points apart on average over 2 shared benchmarks.
- Widest single gap
- Vibe Code Bench (Vals AI): Ember-1 83.9% against GLM 5.1 31.5%, 52.4 points apart on a 0 to 100 scale.
- Output price
- Ember-1 $15.00 against GLM 5.1 $4.40 per million output tokens, 3.4x apart.
- Context window
- Ember-1 takes 1.05M tokens, GLM 5.1 205K.
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 | Ember-1 | Bars | GLM 5.1 | Ties |
|---|---|---|---|---|
| Coding | 2 | 0 | ||
| Agentic work | 2 | 0 | ||
| General | 1 | 0 | ||
| All shared boards | 5 | 0 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index20
| Benchmark | Ember-1 | GLM 5.1 | Leader |
|---|---|---|---|
| LMArena WebDev | Not measured | 1508 | Only GLM 5.1 measured |
| AA Coding Index | Not measured | 55.8 | Only GLM 5.1 measured |
| LiveCodeBench (Vals AI) | Not measured | 81.4% | Only GLM 5.1 measured |
| SWE-bench Verified (Vals AI) | Not measured | 76.4% | Only GLM 5.1 measured |
| Terminal-Bench 4 (Vals AI) | 20.7% | Not measured | Only Ember-1 measured |
| Vibe Code Bench (Vals AI) | 83.9% | 31.5% | Ember-1 |
| Code migration (Vals AI) | 32.5% | 25.8% | Ember-1 |
| ProgramBench (Vals AI) | Not measured | 0.0% | Only GLM 5.1 measured |
| IOI (Vals AI) | 46.3% | Not measured | Only Ember-1 measured |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 56.9% | Only GLM 5.1 measured |
| CyberBench (Vals AI) | 69.5% | Not measured | Only Ember-1 measured |
| SciCode | Not measured | 44.8% | Only GLM 5.1 measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 43.2% | Only GLM 5.1 measured |
| WeirdML | Not measured | 57.1% | Only GLM 5.1 measured |
| ALE-Bench | Not measured | 887.1 | Only GLM 5.1 measured |
| LMArena Text: coding | Not measured | 1485 | Only GLM 5.1 measured |
| LMArena Text: software and IT | Not measured | 1484 | Only GLM 5.1 measured |
| LMArena WebDev: React | Not measured | 1505 | Only GLM 5.1 measured |
| LMArena WebDev: HTML | Not measured | 1508 | Only GLM 5.1 measured |
| Neither model has a result on the other 19 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
| Benchmark | Ember-1 | GLM 5.1 | Leader |
|---|---|---|---|
| AA Intelligence Index | Not measured | 26.1 | Only GLM 5.1 measured |
| Epoch Capabilities Index | Not measured | 149.8 | Only GLM 5.1 measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Ember-1 | GLM 5.1 | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 23.9 | Only GLM 5.1 measured |
| Design Arena: agents building web apps | Not measured | 1175 | Only GLM 5.1 measured |
| Design Arena: agents building full-stack apps | Not measured | 1167 | Only GLM 5.1 measured |
| Design Arena: agents building mobile apps | Not measured | 1161 | Only GLM 5.1 measured |
| Design Arena: agents building Android apps | Not measured | 1187 | Only GLM 5.1 measured |
| Design Arena: agents building Godot games | Not measured | 1053 | Only GLM 5.1 measured |
| Design Arena: agents building games | Not measured | 1164 | Only GLM 5.1 measured |
| Design Arena: HTML slides | Not measured | 1170 | Only GLM 5.1 measured |
| Design Arena: PowerPoint slides | Not measured | 1188 | Only GLM 5.1 measured |
| Design Arena: spreadsheets | Not measured | 1315 | Only GLM 5.1 measured |
| Finance Agent (Vals AI) | 51.8% | 44.8% | Ember-1 |
| Tax Agent Bench (Vals AI) | 31.1% | Not measured | Only Ember-1 measured |
| Legal Research Bench (Vals AI) | 44.7% | 27.9% | Ember-1 |
| Excel Modeling Benchmark (Vals AI) | 63.4% | Not measured | Only Ember-1 measured |
| BioMysteryBench (Vals AI) | 67.0% | Not measured | Only Ember-1 measured |
| Terminal-Bench-Science (Vals AI) | 5.7% | Not measured | Only Ember-1 measured |
| Vals Science Index | 31.8% | Not measured | Only Ember-1 measured |
| τ²-Bench Telecom | Not measured | 97.7% | Only GLM 5.1 measured |
| APEX-Agents | Not measured | 40.9% | Only GLM 5.1 measured |
| Vending-Bench 2 | Not measured | $5,634 | Only GLM 5.1 measured |
| Neither model has a result on the other 19 boards here | |||
ReasoningDirectional onlyPublic boards, shown as published, kept out of the index10 boards, none shared
| Benchmark | Ember-1 | GLM 5.1 | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 84.5% | Only GLM 5.1 measured |
| MysteryMechanism (Vals AI) | 22.5% | Not measured | Only Ember-1 measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 86.8% | Only GLM 5.1 measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 30.1% | Only GLM 5.1 measured |
| GPQA Diamond (Epoch AI run) | Not measured | 89.9% | Only GLM 5.1 measured |
| SimpleBench | Not measured | 55.1% | Only GLM 5.1 measured |
| Chess puzzles | Not measured | 20.0% | Only GLM 5.1 measured |
| LMArena Text: hard prompts | Not measured | 1473 | Only GLM 5.1 measured |
| LMArena Text: expert | Not measured | 1478 | Only GLM 5.1 measured |
| LMArena Text: hard prompts in English | Not measured | 1482 | Only GLM 5.1 measured |
| Neither model has a result on the other 11 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared
| Benchmark | Ember-1 | GLM 5.1 | Leader |
|---|---|---|---|
| AIME | Not measured | 91.9% | Only GLM 5.1 measured |
| OTIS Mock AIME | Not measured | 93.3% | Only GLM 5.1 measured |
| FrontierMath, tiers 1 to 3 | Not measured | 36.8% | Only GLM 5.1 measured |
| ProofBench | Not measured | 22.2% | Only GLM 5.1 measured |
| LMArena Text: math | Not measured | 1473 | Only GLM 5.1 measured |
| LMArena Text: mathematical work | Not measured | 1470 | Only GLM 5.1 measured |
| Neither model has a result on the other 7 boards here | |||
KnowledgeDirectional onlyPublic boards, shown as published, kept out of the index11 boards, none shared
| Benchmark | Ember-1 | GLM 5.1 | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 86.9% | Only GLM 5.1 measured |
| LegalBench (Vals AI) | Not measured | 84.4% | Only GLM 5.1 measured |
| CaseLaw (Vals AI) | Not measured | 51.5% | Only GLM 5.1 measured |
| CorpFin (Vals AI) | Not measured | 64.5% | Only GLM 5.1 measured |
| TaxEval (Vals AI) | Not measured | 71.2% | Only GLM 5.1 measured |
| MedCode (Vals AI) | Not measured | 41.6% | Only GLM 5.1 measured |
| SimpleQA Verified | Not measured | 34.0% | Only GLM 5.1 measured |
| LMArena Text: science | Not measured | 1478 | Only GLM 5.1 measured |
| LMArena Text: medicine and healthcare | Not measured | 1474 | Only GLM 5.1 measured |
| LMArena Text: legal and government | Not measured | 1465 | Only GLM 5.1 measured |
| LMArena Text: business and finance | Not measured | 1452 | Only GLM 5.1 measured |
| Neither model has a result on the other 6 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
| Benchmark | Ember-1 | GLM 5.1 | Leader |
|---|---|---|---|
| Design Arena: websites | Not measured | 1290 | Only GLM 5.1 measured |
| Design Arena: UI components | Not measured | 1292 | Only GLM 5.1 measured |
| Design Arena: game dev | Not measured | 1265 | Only GLM 5.1 measured |
| Design Arena: data viz | Not measured | 1366 | Only GLM 5.1 measured |
| Design Arena: 3D | Not measured | 1336 | Only GLM 5.1 measured |
| Design Arena: all code categories | Not measured | 1268 | Only GLM 5.1 measured |
| Design Arena: SVG | Not measured | 1218 | Only GLM 5.1 measured |
| Design Arena: ASCII art | Not measured | 1142 | Only 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 index10
| Benchmark | Ember-1 | GLM 5.1 | Leader |
|---|---|---|---|
| Public Benefits Bench (Vals AI) | 66.2% | 61.8% | Ember-1 |
| MedScribe (Vals AI) | Not measured | 72.3% | Only GLM 5.1 measured |
| IFBench | Not measured | 76.3% | Only GLM 5.1 measured |
| Long context reasoning (AA-LCR) | Not measured | 73.7% | Only GLM 5.1 measured |
| ExploitBench | Not measured | 18.1% | Only GLM 5.1 measured |
| LMArena Text | Not measured | 1463 | Only GLM 5.1 measured |
| LMArena Text: instruction following | Not measured | 1453 | Only GLM 5.1 measured |
| LMArena Text: creative writing | Not measured | 1453 | Only GLM 5.1 measured |
| LMArena Text: English | Not measured | 1476 | Only GLM 5.1 measured |
| LMArena Text: non-English | Not measured | 1448 | Only GLM 5.1 measured |
| LMArena Text: Chinese | Not measured | 1515 | Only GLM 5.1 measured |
| LMArena Text: German | Not measured | 1467 | Only GLM 5.1 measured |
| LMArena Text: Japanese | Not measured | 1435 | Only GLM 5.1 measured |
| LMArena Text: Korean | Not measured | 1424 | Only GLM 5.1 measured |
| LMArena Text: French | Not measured | 1470 | Only GLM 5.1 measured |
| LMArena Text: Spanish | Not measured | 1468 | Only GLM 5.1 measured |
| LMArena Text: Russian | Not measured | 1454 | Only GLM 5.1 measured |
| LMArena Text: Polish | Not measured | 1449 | Only GLM 5.1 measured |
| LMArena Text: multi-turn | Not measured | 1473 | Only GLM 5.1 measured |
| LMArena Text: longer queries | Not measured | 1467 | Only GLM 5.1 measured |
| LMArena Text: writing and language | Not measured | 1454 | Only GLM 5.1 measured |
| LMArena Text: entertainment and media | Not measured | 1442 | Only GLM 5.1 measured |
| 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
| Benchmark | Ember-1 | GLM 5.1 | 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
GLM 5.1 costs less
Repository review
50K input + 3K output tokens
GLM 5.1 costs less
Agent loop
200K input + 10K output tokens
GLM 5.1 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 | Fireworks Ember-1 | Z.ai GLM 5.1 |
|---|---|---|
| Maker | Fireworks | Z.ai |
| Weights | No public weights listed | Open weights |
| Released | September 24, 2026 | April 7, 2026 |
| Context window | 1.05M | 205K |
| Input $/Mtok | $3.00 | $1.40 |
| Output $/Mtok | $15.00 | $4.40 |
| Coding index | 52.6 | 49.2 |
| Independent measurements behind it | 2 | 3 |
| Cost per solved task | Not computable | $0.60 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Ember-1 better than GLM 5.1 for coding?
Pick Ember-1 for coding: it scores 52.6 on the Vibe Coding Index against 49.2 for GLM 5.1, though on 2 benchmarks against 3. Pick GLM 5.1 when output tokens cost 3.4x less.
Which is cheaper, Ember-1 or GLM 5.1?
Ember-1 costs $3.00 per million input tokens and $15.00 per million output tokens; GLM 5.1 costs $1.40 and $4.40. Cost per solved task is known for GLM 5.1 only.
Which has the bigger context window, Ember-1 or GLM 5.1?
Ember-1, with 1.05M tokens against 205K.
How many benchmarks is the Ember-1 vs GLM 5.1 comparison based on?
5 benchmarks have a result for both models as of October 21, 2026. Ember-1's coding index rests on 2 independent benchmarks and GLM 5.1's on 3. Where only one model has a result, the page says so instead of naming a winner.