Motif 3 vs Step 3.7 Flash vs Seed 2.1 Turbo
Step 3.7 Flash comes out ahead, 62 to 57 and 44 on our weighted score, and it is the cheaper option too.
Motif Technologies
Motif 3
44/100- ECI—
- Price$0.50 / $2.00
- Context262K
- Our pick
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
Step 3.7 Flash is our pick
Step 3.7 Flash is the better all-round choice, scoring 62/100 against Seed 2.1 Turbo (57) and Motif 3 (44). It leads on price. Seed 2.1 Turbo wins 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 priceStep 3.7 FlashStep 3.7 Flash $0.416 · Motif 3 $0.875 · Seed 2.1 Turbo $0.891 per 1M tokens (3:1 blend)
- Longest contextMotif 3Motif 3 262,144 · Step 3.7 Flash 256,000 · Seed 2.1 Turbo 256,000 tokens
- Widest inputsStep 3.7 Flash and Seed 2.1 TurboMotif 3: Text · Step 3.7 Flash: Text, Images, Video · Seed 2.1 Turbo: Text, Images, Video
- Self-hostingMotif 3 and Step 3.7 FlashPublishes downloadable weights (MIT)
| Measure | Weight | Motif 3 | Step 3.7 Flash | Seed 2.1 Turbo |
|---|---|---|---|---|
| Price | 50% | 53 | 68 | 52 |
| Inputs & features | 30% | 35 | 70 | 80 |
| Context window | 20% | 37 | 36 | 36 |
| Overall | 100% | 44/100 | 62/100 | 57/100 |
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 | Motif 3Motif Technologies | Step 3.7 FlashStepFun | Seed 2.1 TurboByteDance Seed |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $0.50 | $0.185 (best) | $0.445 |
| Output | $2.00 | $1.11 (best) | $2.23 |
| Cached input | — | $0.037 (best) | $0.089 |
| Blended (3:1) | $0.875 | $0.416 (best) | $0.891 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Median of 1 providers | Official StepFun (Global) API | Official Volcengine Ark API |
| Limits | |||
| Context window | 262,144 tokens (best) | 256,000 tokens | 256,000 tokens |
| Max output | 262,144 tokens (best) | 256,000 tokens | 256,000 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | No | Yes | Yes |
| PDFs | No | No | No |
| Audio | No | No | No |
| Video | No | Yes | Yes |
| Reasoning | Yes | Yeslow · medium · high | Yesminimal · low · medium · high · xhigh · max |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | No | Yes |
| Availability | |||
| Weights | OpenMIT | Open | Proprietary |
| API model ID | — | step-3.7-flash | doubao-seed-2-1-turbo-260628 |
| API providers | 1 | 18 (best) | 4 |
| Released | Aug 7, 2026 | May 29, 2026 | Jun 23, 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.
- Motif 3$9.00
- Step 3.7 Flash$4.07
- Seed 2.1 Turbo$8.91
Which should you choose?
Which is better: Motif 3, Step 3.7 Flash or Seed 2.1 Turbo?
Step 3.7 Flash is the better all-round choice, scoring 62/100 against Seed 2.1 Turbo (57) and Motif 3 (44). It leads on price. Seed 2.1 Turbo wins 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, Motif 3, Step 3.7 Flash or Seed 2.1 Turbo?
Step 3.7 Flash is cheaper at $0.185 input / $1.11 output per million tokens (official StepFun (Global) API price). Motif 3 costs $0.50 input / $2.00 output per million tokens (median across 1 API provider); 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 $0.416 per million tokens for Step 3.7 Flash versus $0.875 for Motif 3 (2.1× as much) and $0.891 for Seed 2.1 Turbo (2.1× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Motif 3 has not been scored yet, Step 3.7 Flash has not been scored yet and Seed 2.1 Turbo has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Motif 3, Step 3.7 Flash and Seed 2.1 Turbo 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?
Motif 3 has the largest context window at 262,144 tokens, against 256,000 for Step 3.7 Flash and 256,000 for Seed 2.1 Turbo. Maximum output per response: Motif 3 up to 262,144, Step 3.7 Flash up to 256,000, Seed 2.1 Turbo up to 256,000 tokens.
Which can read images, PDFs, audio or video?
Motif 3 accepts text; Step 3.7 Flash accepts text, images and video; Seed 2.1 Turbo accepts text, images and video. Step 3.7 Flash handles the widest range of inputs.
Are any of these open source?
Motif 3 and Step 3.7 Flash publishes its weights (MIT) and can be self-hosted; Seed 2.1 Turbo is proprietary.
Which is newer?
Motif 3 is the newest, released Aug 7, 2026. Seed 2.1 Turbo came out Jun 23, 2026; Step 3.7 Flash came out May 29, 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.
