Seed 2.1 Turbo vs Solar Pro 4 vs Motif 3
Too close to call on our weighted score (Seed 2.1 Turbo 57, Solar Pro 4 55, Motif 3 44). The right pick depends on what you value most.
ByteDance SeedSeed 2.1 Turbo
57/100- ECI—
- Price$0.445 / $2.23
- Context256K
Upstage
Solar Pro 4
55/100- ECI—
- Price$0.30 / $1.20
- Context524K
Motif Technologies
Motif 3
44/100- ECI—
- Price$0.50 / $2.00
- Context262K
Too close to call
It is close. Our weighted score puts them within 3 points (Seed 2.1 Turbo 57/100, Solar Pro 4 55/100, Motif 3 44/100), so choose by what matters most for your work: Solar Pro 4 on price and Solar Pro 4 for long inputs. 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 priceSolar Pro 4Solar Pro 4 $0.525 · Motif 3 $0.875 · Seed 2.1 Turbo $0.891 per 1M tokens (3:1 blend)
- Longest contextSolar Pro 4Solar Pro 4 524,288 · Motif 3 262,144 · Seed 2.1 Turbo 256,000 tokens
- Widest inputsSeed 2.1 TurboSeed 2.1 Turbo: Text, Images, Video · Solar Pro 4: Text · Motif 3: Text
- Self-hostingMotif 3Publishes downloadable weights (MIT)
| Measure | Weight | Seed 2.1 Turbo | Solar Pro 4 | Motif 3 |
|---|---|---|---|---|
| Price | 50% | 52 | 63 | 53 |
| Inputs & features | 30% | 80 | 45 | 35 |
| Context window | 20% | 36 | 49 | 37 |
| Overall | 100% | 57/100 | 55/100 | 44/100 |
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 | Seed 2.1 TurboByteDance Seed | Solar Pro 4Upstage | Motif 3Motif Technologies |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $0.445 | $0.30 (best) | $0.50 |
| Output | $2.23 | $1.20 (best) | $2.00 |
| Cached input | $0.089 | $0.06 (best) | — |
| Blended (3:1) | $0.891 | $0.525 (best) | $0.875 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official Volcengine Ark API | Official Upstage API | Median of 1 providers |
| Limits | |||
| Context window | 256,000 tokens | 524,288 tokens (best) | 262,144 tokens |
| Max output | 256,000 tokens | 131,072 tokens | 262,144 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | No | No |
| PDFs | No | No | No |
| Audio | No | No | No |
| Video | Yes | No | No |
| Reasoning | Yesminimal · low · medium · high · xhigh · max | Yesminimal · low · medium · high · xhigh · max | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | Yes | No |
| Availability | |||
| Weights | Proprietary | Proprietary | OpenMIT |
| API model ID | doubao-seed-2-1-turbo-260628 | solar-pro4 | — |
| API providers | 4 (best) | 3 | 1 |
| Released | Jun 23, 2026 | Aug 6, 2026 | Aug 7, 2026 |
| Knowledge cutoff | — | Feb 2026 | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Seed 2.1 Turbo$8.91
- Solar Pro 4$5.40
- Motif 3$9.00
Which should you choose?
Which is better: Seed 2.1 Turbo, Solar Pro 4 or Motif 3?
It is close. Our weighted score puts them within 3 points (Seed 2.1 Turbo 57/100, Solar Pro 4 55/100, Motif 3 44/100), so choose by what matters most for your work: Solar Pro 4 on price and Solar Pro 4 for long inputs. 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, Seed 2.1 Turbo, Solar Pro 4 or Motif 3?
Solar Pro 4 is cheaper at $0.30 input / $1.20 output per million tokens (official Upstage 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 $0.525 per million tokens for Solar Pro 4 versus $0.875 for Motif 3 (1.7× as much) and $0.891 for Seed 2.1 Turbo (1.7× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Seed 2.1 Turbo has not been scored yet, Solar Pro 4 has not been scored yet and Motif 3 has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Seed 2.1 Turbo, Solar Pro 4 and Motif 3 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?
Solar Pro 4 has the largest context window at 524,288 tokens, against 262,144 for Motif 3 and 256,000 for Seed 2.1 Turbo. Maximum output per response: Seed 2.1 Turbo up to 256,000, Solar Pro 4 up to 131,072, Motif 3 up to 262,144 tokens.
Which can read images, PDFs, audio or video?
Seed 2.1 Turbo accepts text, images and video; Solar Pro 4 accepts text; Motif 3 accepts text. Seed 2.1 Turbo handles the widest range of inputs.
Are any of these open source?
Motif 3 publishes its weights (MIT) and can be self-hosted; Seed 2.1 Turbo and Solar Pro 4 is proprietary.
Which is newer?
Motif 3 is the newest, released Aug 7, 2026. Solar Pro 4 came out Aug 6, 2026; Seed 2.1 Turbo came out Jun 23, 2026. Knowledge cutoff: Solar Pro 4 Feb 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.
