Nemotron 3 Ultra vs Reka Flash 3
Nemotron 3 Ultra leads Reka Flash 3 on the Artificial Analysis Intelligence Index, 22.9 to 6.4, and Reka Flash 3 costs 12.0x less per output token ($0.20 vs $2.40 per million). Updated October 23, 2026; 7 benchmarks have a result for both.
Nemotron 3 Ultra or Reka Flash 3: which to pick
Only Nemotron 3 Ultra has a coding score, 30.0 on the Vibe Coding Index; Reka Flash 3 has none, so the two cannot be ranked on coding.
Pick Reka Flash 3 for output tokens 12.0x cheaper ($0.20 vs $2.40 per million).
- Shared results
- 7
- Nemotron 3 Ultra only
- 64
- Reka Flash 3 only
- 5
- 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
No call
Only Nemotron 3 Ultra has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
Nemotron 3 Ultra
Nemotron 3 Ultra leads, 22.9 against 6.4.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Nemotron 3 Ultra has a AA Agentic Index result, 20.1.
Directional only
Reasoning
GPQA Diamond
No call
Only Nemotron 3 Ultra has a GPQA Diamond result, 86.1%.
Directional only
Knowledge
MMLU Pro
No call
Only Nemotron 3 Ultra has a MMLU Pro result, 85.8%.
Directional only
Web design
Design Arena: websites
No call
Only Nemotron 3 Ultra has a Design Arena: websites result, 1145.
Directional only
Long documents
Listed context window
Nemotron 3 Ultra
Nemotron 3 Ultra takes 262K tokens against 66K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Reka Flash 3
Nemotron 3 Ultra $0.0018, Reka Flash 3 $0.0002 per turn.
List prices
At a glance
- Coding index
- Nemotron 3 Ultra 30.0 from 3 benchmarks, Reka Flash 3 not benchmarked.
- Widest category
- Agentic work, 83.3 points apart on average over 1 shared benchmark.
- Widest single gap
- τ²-Bench Telecom: Nemotron 3 Ultra 83.3% against Reka Flash 3 0.0%, 83.3 points apart on a 0 to 100 scale.
- Output price
- Nemotron 3 Ultra $2.40 against Reka Flash 3 $0.20 per million output tokens, 12.0x apart.
- Context window
- Nemotron 3 Ultra takes 262K tokens, Reka Flash 3 66K.
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 | Nemotron 3 Ultra | Bars | Reka Flash 3 | Ties |
|---|---|---|---|---|
| Coding | 1 | 0 | ||
| Intelligence | 1 | 0 | ||
| Agentic work | 1 | 0 | ||
| Reasoning | 2 | 0 | ||
| General | 2 | 0 | ||
| All shared boards | 7 | 0 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index10
| Benchmark | Nemotron 3 Ultra | Reka Flash 3 | Leader |
|---|---|---|---|
| AA Coding Index | 49.3 | Not measured | Only Nemotron 3 Ultra measured |
| LiveCodeBench (Vals AI) | 86.0% | Not measured | Only Nemotron 3 Ultra measured |
| SWE-bench Verified (Vals AI) | 69.0% | Not measured | Only Nemotron 3 Ultra measured |
| Vibe Code Bench (Vals AI) | 7.6% | Not measured | Only Nemotron 3 Ultra measured |
| Code migration (Vals AI) | 4.9% | Not measured | Only Nemotron 3 Ultra measured |
| ProgramBench (Vals AI) | 0.0% | Not measured | Only Nemotron 3 Ultra measured |
| Terminal-Bench 2.1 (Vals AI) | 50.9% | Not measured | Only Nemotron 3 Ultra measured |
| LiveCodeBench (Artificial Analysis run) | Not measured | 43.5% | Only Reka Flash 3 measured |
| SciCode | 40.3% | Not measured | Only Nemotron 3 Ultra measured |
| Terminal-Bench Hard (Artificial Analysis run) | 36.4% | 0.0% | Nemotron 3 Ultra |
| FrontierCode | 13.6% | Not measured | Only Nemotron 3 Ultra measured |
| WeirdML | 43.5% | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: coding | 1467 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: software and IT | 1468 | Not measured | Only Nemotron 3 Ultra measured |
| Neither model has a result on the other 29 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Nemotron 3 Ultra | Reka Flash 3 | Leader |
|---|---|---|---|
| AA Intelligence Index | 22.9 | 6.4 | Nemotron 3 Ultra |
| Epoch Capabilities Index | 146.0 | Not measured | Only Nemotron 3 Ultra measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Nemotron 3 Ultra | Reka Flash 3 | Leader |
|---|---|---|---|
| AA Agentic Index | 20.1 | Not measured | Only Nemotron 3 Ultra measured |
| Finance Agent (Vals AI) | 37.7% | Not measured | Only Nemotron 3 Ultra measured |
| Legal Research Bench (Vals AI) | 15.4% | Not measured | Only Nemotron 3 Ultra measured |
| Excel Modeling Benchmark (Vals AI) | 31.7% | Not measured | Only Nemotron 3 Ultra measured |
| τ²-Bench Telecom | 83.3% | 0.0% | Nemotron 3 Ultra |
| APEX-Agents | 22.7% | Not measured | Only Nemotron 3 Ultra measured |
| BALROG | Not measured | 29.2% | Only Reka Flash 3 measured |
| MCP Atlas | 63.1% | Not measured | Only Nemotron 3 Ultra measured |
| Neither model has a result on the other 34 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Nemotron 3 Ultra | Reka Flash 3 | Leader |
|---|---|---|---|
| GPQA Diamond | 86.1% | Not measured | Only Nemotron 3 Ultra measured |
| GPQA Diamond (Artificial Analysis run) | 86.7% | 52.9% | Nemotron 3 Ultra |
| Humanity's Last Exam (Artificial Analysis run) | 28.4% | 4.4% | Nemotron 3 Ultra |
| GPQA Diamond (Epoch AI run) | 85.4% | Not measured | Only Nemotron 3 Ultra measured |
| Mystery game puzzles | 20.0% | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: hard prompts | 1452 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: expert | 1472 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: hard prompts in English | 1453 | Not measured | Only Nemotron 3 Ultra measured |
| Neither model has a result on the other 15 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared
| Benchmark | Nemotron 3 Ultra | Reka Flash 3 | Leader |
|---|---|---|---|
| AA Math Index | Not measured | 33.7 | Only Reka Flash 3 measured |
| AIME 2025 (Artificial Analysis run) | Not measured | 33.7% | Only Reka Flash 3 measured |
| OTIS Mock AIME | 86.7% | Not measured | Only Nemotron 3 Ultra measured |
| ProofBench | 2.0% | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: math | 1457 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: mathematical work | 1462 | Not measured | Only Nemotron 3 Ultra measured |
| Neither model has a result on the other 8 boards here | |||
KnowledgeDirectional onlyPublic boards, shown as published, kept out of the index10 boards, none shared
| Benchmark | Nemotron 3 Ultra | Reka Flash 3 | Leader |
|---|---|---|---|
| MMLU Pro | 85.8% | Not measured | Only Nemotron 3 Ultra measured |
| LegalBench (Vals AI) | 82.1% | Not measured | Only Nemotron 3 Ultra measured |
| CorpFin (Vals AI) | 65.5% | Not measured | Only Nemotron 3 Ultra measured |
| TaxEval (Vals AI) | 73.1% | Not measured | Only Nemotron 3 Ultra measured |
| MedCode (Vals AI) | 38.6% | Not measured | Only Nemotron 3 Ultra measured |
| MMLU Pro (Artificial Analysis run) | Not measured | 66.9% | Only Reka Flash 3 measured |
| LMArena Text: science | 1465 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: medicine and healthcare | 1455 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: legal and government | 1453 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: business and finance | 1435 | Not measured | Only Nemotron 3 Ultra measured |
| Neither model has a result on the other 10 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
| Benchmark | Nemotron 3 Ultra | Reka Flash 3 | Leader |
|---|---|---|---|
| Design Arena: websites | 1145 | Not measured | Only Nemotron 3 Ultra measured |
| Design Arena: UI components | 1135 | Not measured | Only Nemotron 3 Ultra measured |
| Design Arena: game dev | 1138 | Not measured | Only Nemotron 3 Ultra measured |
| Design Arena: data viz | 1142 | Not measured | Only Nemotron 3 Ultra measured |
| Design Arena: 3D | 1132 | Not measured | Only Nemotron 3 Ultra measured |
| Design Arena: all code categories | 1146 | Not measured | Only Nemotron 3 Ultra measured |
| Design Arena: SVG | 1069 | Not measured | Only Nemotron 3 Ultra measured |
| Design Arena: ASCII art | 1100 | Not measured | Only Nemotron 3 Ultra measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Nemotron 3 Ultra | Reka Flash 3 | Leader |
|---|---|---|---|
| IFBench | 81.4% | 30.4% | Nemotron 3 Ultra |
| Long context reasoning (AA-LCR) | 79.3% | 0.0% | Nemotron 3 Ultra |
| DTBench | 90.1% | Not measured | Only Nemotron 3 Ultra measured |
| LMCA | 36.9% | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text | 1445 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: instruction following | 1418 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: creative writing | 1398 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: English | 1454 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: non-English | 1427 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: Chinese | 1498 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: German | 1474 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: Korean | 1385 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: French | 1473 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: Spanish | 1454 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: Russian | 1417 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: Polish | 1385 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: multi-turn | 1411 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: longer queries | 1437 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: writing and language | 1405 | Not measured | Only Nemotron 3 Ultra measured |
| LMArena Text: entertainment and media | 1397 | Not measured | Only Nemotron 3 Ultra measured |
| Neither model has a result on the other 28 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Nemotron 3 Ultra | Reka Flash 3 | 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
Reka Flash 3 costs less
Repository review
50K input + 3K output tokens
Reka Flash 3 costs less
Agent loop
200K input + 10K output tokens
Reka Flash 3 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 | NVIDIA Nemotron 3 Ultra | Reka Flash 3 |
|---|---|---|
| Maker | NVIDIA | Reka |
| Weights | Open weights | Open weights |
| Released | June 4, 2026 | March 12, 2025 |
| Context window | 262K | 66K |
| Input $/Mtok | $0.60 | $0.10 |
| Output $/Mtok | $2.40 | $0.20 |
| Coding index | 30.0 | Not benchmarked |
| Independent measurements behind it | 3 | 0 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Nemotron 3 Ultra better than Reka Flash 3 for coding?
Only Nemotron 3 Ultra has a coding score, 30.0 on the Vibe Coding Index; Reka Flash 3 has none, so the two cannot be ranked on coding. Pick Reka Flash 3 for output tokens 12.0x cheaper ($0.20 vs $2.40 per million).
Which is cheaper, Nemotron 3 Ultra or Reka Flash 3?
Nemotron 3 Ultra costs $0.60 per million input tokens and $2.40 per million output tokens; Reka Flash 3 costs $0.10 and $0.20. Cost per solved task is known for neither of them.
Which has the bigger context window, Nemotron 3 Ultra or Reka Flash 3?
Nemotron 3 Ultra, with 262K tokens against 66K.
How many benchmarks is the Nemotron 3 Ultra vs Reka Flash 3 comparison based on?
7 benchmarks have a result for both models as of October 23, 2026. Nemotron 3 Ultra's coding index rests on 3 independent benchmarks and Reka Flash 3's on 0. Where only one model has a result, the page says so instead of naming a winner.