Step 5 Preview vs UnslopNemo 12B
UnslopNemo 12B costs 6.8x less per output token than Step 5 Preview ($0.40 vs $2.70 per million). Updated October 22, 2026; no benchmark has tested both models yet.
- Coding
- 61.1
- Overall
- 60.5
- Output $/M
- $2.70
- Coding
- No data
- Overall
- No data
- Output $/M
- $0.40
Step 5 Preview or UnslopNemo 12B: which to pick
Only Step 5 Preview has a coding score, 61.1 on the Vibe Coding Index; UnslopNemo 12B has none, so the two cannot be ranked on coding.
Pick UnslopNemo 12B for output tokens 6.8x cheaper ($0.40 vs $2.70 per million).
No benchmark has tested both yet. Step 5 Preview has results on LiveBench coding, LMArena WebDev and Terminal-Bench 4 (Vals AI); UnslopNemo 12B has none yet. Compare them on price and context instead.
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
No call
Only Step 5 Preview has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
No call
Only Step 5 Preview has a AA Intelligence Index result, 43.7.
Directional only
Long documents
Listed context window
Step 5 Preview
Step 5 Preview takes 1.05M tokens against 1.02M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
UnslopNemo 12B
Step 5 Preview $0.0024, UnslopNemo 12B $0.0006 per turn.
List prices
At a glance
- Coding index
- Step 5 Preview 61.1 from 4 benchmarks, UnslopNemo 12B not benchmarked.
- Widest category
- None yet: no category has been tested on both models.
- Widest single gap
- None yet: no benchmark has tested both models.
- Output price
- Step 5 Preview $2.70 against UnslopNemo 12B $0.40 per million output tokens, 6.8x apart.
- Context window
- Step 5 Preview takes 1.05M tokens, UnslopNemo 12B 1.02M.
Benchmark by benchmark
Every board either model has a result on, a category to a fold; bars are each result on a 0 to 100 scale. Only one model is measured on each, so no row names a leader.
CodingDirectional onlySix of these boards feed the Vibe Coding Index13 boards measured
| Benchmark | Step 5 Preview | UnslopNemo 12B | Leader |
|---|---|---|---|
| LiveBench coding | 85.6% | Not measured | Only Step 5 Preview measured |
| LMArena WebDev | 1567 | Not measured | Only Step 5 Preview measured |
| Terminal-Bench 4 (Vals AI) | 31.8% | Not measured | Only Step 5 Preview measured |
| Vibe Code Bench (Vals AI) | 70.4% | Not measured | Only Step 5 Preview measured |
| Code migration (Vals AI) | 39.0% | Not measured | Only Step 5 Preview measured |
| IOI (Vals AI) | 38.1% | Not measured | Only Step 5 Preview measured |
| SWE-bench Multimodal (Vals AI) | 40.8% | Not measured | Only Step 5 Preview measured |
| SciCode | 58.9% | Not measured | Only Step 5 Preview measured |
| LMArena Text: coding | 1485 | Not measured | Only Step 5 Preview measured |
| LMArena Text: software and IT | 1473 | Not measured | Only Step 5 Preview measured |
| LMArena WebDev: React | 1583 | Not measured | Only Step 5 Preview measured |
| LMArena WebDev: HTML | 1556 | Not measured | Only Step 5 Preview measured |
| LMArena WebDev: from an image | 1550 | Not measured | Only Step 5 Preview measured |
| Neither model has a result on the other 26 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | Step 5 Preview | UnslopNemo 12B | Leader |
|---|---|---|---|
| AA Intelligence Index | 43.7 | Not measured | Only Step 5 Preview measured |
| Neither model has a result on the other 1 board here | |||
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index11 boards measured
| Benchmark | Step 5 Preview | UnslopNemo 12B | Leader |
|---|---|---|---|
| LiveBench research | 72.8% | Not measured | Only Step 5 Preview measured |
| LiveBench browser | 24.0% | Not measured | Only Step 5 Preview measured |
| LiveBench long agentic | 27.5% | Not measured | Only Step 5 Preview measured |
| SREBench (Vals AI) | 0.4% | Not measured | Only Step 5 Preview measured |
| Finance Agent (Vals AI) | 50.7% | Not measured | Only Step 5 Preview measured |
| Tax Agent Bench (Vals AI) | 27.3% | Not measured | Only Step 5 Preview measured |
| Legal Research Bench (Vals AI) | 40.4% | Not measured | Only Step 5 Preview measured |
| Excel Modeling Benchmark (Vals AI) | 57.1% | Not measured | Only Step 5 Preview measured |
| BioMysteryBench (Vals AI) | 67.4% | Not measured | Only Step 5 Preview measured |
| Terminal-Bench-Science (Vals AI) | 2.9% | Not measured | Only Step 5 Preview measured |
| Vals Science Index | 29.6% | Not measured | Only Step 5 Preview measured |
| Neither model has a result on the other 30 boards here | |||
ReasoningDirectional onlyPublic boards, shown as published, kept out of the index8 boards measured
| Benchmark | Step 5 Preview | UnslopNemo 12B | Leader |
|---|---|---|---|
| LiveBench reasoning | 83.8% | Not measured | Only Step 5 Preview measured |
| MysteryMechanism (Vals AI) | 18.5% | Not measured | Only Step 5 Preview measured |
| Humanity's Last Exam (Artificial Analysis run) | 46.5% | Not measured | Only Step 5 Preview measured |
| LMArena Text: hard prompts | 1461 | Not measured | Only Step 5 Preview measured |
| LMArena Text: expert | 1485 | Not measured | Only Step 5 Preview measured |
| LMArena Text: hard prompts in English | 1454 | Not measured | Only Step 5 Preview measured |
| LMArena Vision: diagrams | 1308 | Not measured | Only Step 5 Preview measured |
| LMArena Vision: homework | 1265 | Not measured | Only Step 5 Preview measured |
| Neither model has a result on the other 14 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index3 boards measured
| Benchmark | Step 5 Preview | UnslopNemo 12B | Leader |
|---|---|---|---|
| ProofBench | 42.0% | Not measured | Only Step 5 Preview measured |
| LMArena Text: math | 1458 | Not measured | Only Step 5 Preview measured |
| LMArena Text: mathematical work | 1460 | Not measured | Only Step 5 Preview measured |
| Neither model has a result on the other 10 boards here | |||
KnowledgeDirectional onlyPublic boards, shown as published, kept out of the index4 boards measured
| Benchmark | Step 5 Preview | UnslopNemo 12B | Leader |
|---|---|---|---|
| LMArena Text: science | 1454 | Not measured | Only Step 5 Preview measured |
| LMArena Text: medicine and healthcare | 1439 | Not measured | Only Step 5 Preview measured |
| LMArena Text: legal and government | 1437 | Not measured | Only Step 5 Preview measured |
| LMArena Text: business and finance | 1435 | Not measured | Only Step 5 Preview measured |
| Neither model has a result on the other 14 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | Step 5 Preview | UnslopNemo 12B | Leader |
|---|---|---|---|
| LiveBench design | 76.9% | Not measured | Only Step 5 Preview measured |
| Neither model has a result on the other 8 boards here | |||
GeneralDirectional onlyPublic boards, shown as published, kept out of the index20 boards measured
| Benchmark | Step 5 Preview | UnslopNemo 12B | Leader |
|---|---|---|---|
| LiveBench data analysis | 63.5% | Not measured | Only Step 5 Preview measured |
| Public Benefits Bench (Vals AI) | 58.1% | Not measured | Only Step 5 Preview measured |
| Long context reasoning (AA-LCR) | 88.3% | Not measured | Only Step 5 Preview measured |
| LMArena Text | 1440 | Not measured | Only Step 5 Preview measured |
| LMArena Text: instruction following | 1438 | Not measured | Only Step 5 Preview measured |
| LMArena Text: creative writing | 1409 | Not measured | Only Step 5 Preview measured |
| LMArena Vision | 1265 | Not measured | Only Step 5 Preview measured |
| LMArena Text: English | 1447 | Not measured | Only Step 5 Preview measured |
| LMArena Text: non-English | 1428 | Not measured | Only Step 5 Preview measured |
| LMArena Text: Chinese | 1500 | Not measured | Only Step 5 Preview measured |
| LMArena Text: Japanese | 1383 | Not measured | Only Step 5 Preview measured |
| LMArena Text: French | 1438 | Not measured | Only Step 5 Preview measured |
| LMArena Text: Spanish | 1441 | Not measured | Only Step 5 Preview measured |
| LMArena Text: Russian | 1433 | Not measured | Only Step 5 Preview measured |
| LMArena Text: multi-turn | 1437 | Not measured | Only Step 5 Preview measured |
| LMArena Text: longer queries | 1449 | Not measured | Only Step 5 Preview measured |
| LMArena Text: writing and language | 1425 | Not measured | Only Step 5 Preview measured |
| LMArena Text: entertainment and media | 1412 | Not measured | Only Step 5 Preview measured |
| LMArena Vision: English | 1290 | Not measured | Only Step 5 Preview measured |
| LMArena Vision: reading text | 1282 | Not measured | Only Step 5 Preview measured |
| Neither model has a result on the other 26 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
UnslopNemo 12B costs less
Repository review
50K input + 3K output tokens
UnslopNemo 12B costs less
Agent loop
200K input + 10K output tokens
UnslopNemo 12B 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 | StepFun Step 5 Preview | TheDrummer UnslopNemo 12B |
|---|---|---|
| Maker | StepFun | TheDrummer |
| Weights | Open weights | Open weights |
| Released | October 8, 2026 | November 8, 2024 |
| Context window | 1.05M | 1.02M |
| Input $/Mtok | $1.00 | $0.40 |
| Output $/Mtok | $2.70 | $0.40 |
| Coding index | 61.1 | Not benchmarked |
| Independent measurements behind it | 4 | 0 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Step 5 Preview better than UnslopNemo 12B for coding?
Only Step 5 Preview has a coding score, 61.1 on the Vibe Coding Index; UnslopNemo 12B has none, so the two cannot be ranked on coding. Pick UnslopNemo 12B for output tokens 6.8x cheaper ($0.40 vs $2.70 per million).
Which is cheaper, Step 5 Preview or UnslopNemo 12B?
Step 5 Preview costs $1.00 per million input tokens and $2.70 per million output tokens; UnslopNemo 12B costs $0.40 and $0.40. Cost per solved task is known for neither of them.
Which has the bigger context window, Step 5 Preview or UnslopNemo 12B?
Step 5 Preview, with 1.05M tokens against 1.02M.
Has any benchmark tested both Step 5 Preview and UnslopNemo 12B?
No benchmark has tested both yet. Step 5 Preview has results on LiveBench coding, LMArena WebDev and Terminal-Bench 4 (Vals AI); UnslopNemo 12B has none yet. Compare them on price and context instead. Data as of October 22, 2026.