Step 3.7 Flash vs Seed 2.1 Turbo vs Nemotron 3 Nano Omni 30B A3B Reasoning
Nemotron 3 Nano Omni 30B A3B Reasoning comes out ahead, 69 to 62 and 57 on our weighted score, and it is the cheaper option too.
StepFunStep 3.7 Flash
62/100- ECI—
- Price$0.185 / $1.11
- Context256K
ByteDance SeedSeed 2.1 Turbo
57/100- ECI—
- Price$0.445 / $2.23
- Context256K
- Our pick
NVIDIANemotron 3 Nano Omni 30B A3B Reasoning
69/100- ECI—
- Price$0.25 / $0.85
- Context256K
Nemotron 3 Nano Omni 30B A3B Reasoning is our pick
Nemotron 3 Nano Omni 30B A3B Reasoning is the better all-round choice, scoring 69/100 against Step 3.7 Flash (62) and Seed 2.1 Turbo (57). It leads on inputs & features. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest priceNemotron 3 Nano Omni 30B A3B ReasoningNemotron 3 Nano Omni 30B A3B Reasoning $0.40 · Step 3.7 Flash $0.416 · Seed 2.1 Turbo $0.891 per 1M tokens (3:1 blend)
- Longest contextAbout the sameStep 3.7 Flash 256,000 · Seed 2.1 Turbo 256,000 · Nemotron 3 Nano Omni 30B A3B Reasoning 256,000 tokens
- Widest inputsNemotron 3 Nano Omni 30B A3B ReasoningStep 3.7 Flash: Text, Images, Video · Seed 2.1 Turbo: Text, Images, Video · Nemotron 3 Nano Omni 30B A3B Reasoning: Text, Images, Audio, Video
- Self-hostingStep 3.7 Flash and Nemotron 3 Nano Omni 30B A3B ReasoningPublishes downloadable weights
| Measure | Weight | Step 3.7 Flash | Seed 2.1 Turbo | Nemotron 3 Nano Omni 30B A3B Reasoning |
|---|---|---|---|---|
| Price | 50% | 68 | 52 | 69 |
| Inputs & features | 30% | 70 | 80 | 90 |
| Context window | 20% | 36 | 36 | 36 |
| Overall | 100% | 62/100 | 57/100 | 69/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Step 3.7 FlashStepFun | Seed 2.1 TurboByteDance Seed | Nemotron 3 Nano Omni 30B A3B ReasoningNVIDIA |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $0.185 (best) | $0.445 | $0.25 |
| Output | $1.11 | $2.23 | $0.85 (best) |
| Cached input | $0.037 (best) | $0.089 | — |
| Blended (3:1) | $0.416 | $0.891 | $0.40 (best) |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official StepFun (Global) API | Official Volcengine Ark API | Median of 4 providers |
| Limits | |||
| Context window | 256,000 tokens | 256,000 tokens | 256,000 tokens |
| Max output | 256,000 tokens (best) | 256,000 tokens (best) | 65,536 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | No | No | No |
| Audio | No | No | Yes |
| Video | Yes | Yes | Yes |
| Reasoning | Yeslow · medium · high | Yesminimal · low · medium · high · xhigh · max | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | Yes | Yes |
| Availability | |||
| Weights | Open | Proprietary | Open |
| API model ID | step-3.7-flash | doubao-seed-2-1-turbo-260628 | nvidia/nemotron-3-nano-omni-30b-a3b-reasoning |
| API providers | 18 (best) | 4 | 8 |
| Released | May 29, 2026 | Jun 23, 2026 | Apr 28, 2026 |
| Knowledge cutoff | Mar 1, 2026 | — | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Step 3.7 Flash$4.07
- Seed 2.1 Turbo$8.91
- Nemotron 3 Nano Omni 30B A3B Reasoning$4.20
Which should you choose?
Which is better: Step 3.7 Flash, Seed 2.1 Turbo or Nemotron 3 Nano Omni 30B A3B Reasoning?
Nemotron 3 Nano Omni 30B A3B Reasoning is the better all-round choice, scoring 69/100 against Step 3.7 Flash (62) and Seed 2.1 Turbo (57). It leads on inputs & features. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, Step 3.7 Flash, Seed 2.1 Turbo or Nemotron 3 Nano Omni 30B A3B Reasoning?
Nemotron 3 Nano Omni 30B A3B Reasoning is cheaper at $0.25 input / $0.85 output per million tokens (median across 4 API providers; free on Nvidia). Step 3.7 Flash costs $0.185 input / $1.11 output per million tokens (official StepFun (Global) API price); Seed 2.1 Turbo costs $0.445 input / $2.23 output per million tokens (official Volcengine Ark API price). At a typical mix of three input tokens to one output token, that is $0.40 per million tokens for Nemotron 3 Nano Omni 30B A3B Reasoning versus $0.416 for Step 3.7 Flash (1× as much) and $0.891 for Seed 2.1 Turbo (2.2× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Step 3.7 Flash has not been scored yet, Seed 2.1 Turbo has not been scored yet and Nemotron 3 Nano Omni 30B A3B Reasoning has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Step 3.7 Flash, Seed 2.1 Turbo and Nemotron 3 Nano Omni 30B A3B Reasoning yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. All three support tool calling for agent workflows.
Which has the bigger context window?
Step 3.7 Flash, Seed 2.1 Turbo and Nemotron 3 Nano Omni 30B A3B Reasoning share the same 256,000-token context window. Maximum output per response: Step 3.7 Flash up to 256,000, Seed 2.1 Turbo up to 256,000, Nemotron 3 Nano Omni 30B A3B Reasoning up to 65,536 tokens.
Which can read images, PDFs, audio or video?
Step 3.7 Flash accepts text, images and video; Seed 2.1 Turbo accepts text, images and video; Nemotron 3 Nano Omni 30B A3B Reasoning accepts text, images, audio and video. Nemotron 3 Nano Omni 30B A3B Reasoning handles the widest range of inputs.
Are any of these open source?
Step 3.7 Flash and Nemotron 3 Nano Omni 30B A3B Reasoning publishes its weights and can be self-hosted; Seed 2.1 Turbo is proprietary.
Which is newer?
Seed 2.1 Turbo is the newest, released Jun 23, 2026. Step 3.7 Flash came out May 29, 2026; Nemotron 3 Nano Omni 30B A3B Reasoning came out Apr 28, 2026. Knowledge cutoff: Step 3.7 Flash Mar 1, 2026.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.
