MiMo-V2-Flash vs Step 3.5 Flash 2603 vs Rnj-1 Instruct
Too close to call on our weighted score (Step 3.5 Flash 2603 63, MiMo-V2-Flash 60, Rnj-1 Instruct 50). The right pick depends on what you value most.
XiaomiMiMo-V2-Flash
60/100- ECI—
- Price$0.10 / $0.30
- Context262K
StepFunStep 3.5 Flash 2603
63/100- ECI—
- Price$0.10 / $0.30
- Context256K
Essential AI
Rnj-1 Instruct
50/100- ECI—
- Price$0.15 / $0.15
- Context33K
Too close to call
It is close. Our weighted score puts them within 3 points (Step 3.5 Flash 2603 63/100, MiMo-V2-Flash 60/100, Rnj-1 Instruct 50/100), so choose by what matters most for your work: MiMo-V2-Flash on price and MiMo-V2-Flash 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 priceSame priceMiMo-V2-Flash $0.15 · Step 3.5 Flash 2603 $0.15 · Rnj-1 Instruct $0.15 per 1M tokens (3:1 blend)
- Longest contextMiMo-V2-FlashMiMo-V2-Flash 262,144 · Step 3.5 Flash 2603 256,000 · Rnj-1 Instruct 32,768 tokens
- Widest inputsSame inputsMiMo-V2-Flash: Text · Step 3.5 Flash 2603: Text · Rnj-1 Instruct: Text
- Self-hostingAll open weightsEvery model here can be downloaded and run on your own hardware
| Measure | Weight | MiMo-V2-Flash | Step 3.5 Flash 2603 | Rnj-1 Instruct |
|---|---|---|---|---|
| Price | 50% | 85 | 85 | 85 |
| Inputs & features | 30% | 35 | 45 | 25 |
| Context window | 20% | 37 | 36 | 0 |
| Overall | 100% | 60/100 | 63/100 | 50/100 |
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 | MiMo-V2-FlashXiaomi | Step 3.5 Flash 2603StepFun | Rnj-1 InstructEssential AI |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $0.10 (best) | $0.10 (best) | $0.15 |
| Output | $0.30 | $0.30 | $0.15 (best) |
| Cached input | — | $0.02 | — |
| Blended (3:1) | $0.15 | $0.15 | $0.15 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Median of 3 providers | Official StepFun (Global) API | Median of 1 providers |
| Limits | |||
| Context window | 262,144 tokens (best) | 256,000 tokens | 32,768 tokens |
| Max output | 65,536 tokens | 256,000 tokens (best) | 32,768 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | No | No | No |
| PDFs | No | No | No |
| Audio | No | No | No |
| Video | No | No | No |
| Reasoning | Yes | Yeslow · high | No |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | Yes | No |
| Availability | |||
| Weights | Open | Open | OpenApache 2.0 |
| API model ID | — | step-3.5-flash-2603 | — |
| API providers | 4 (best) | 4 (best) | 1 |
| Released | Dec 16, 2025 | Apr 2, 2026 | Dec 4, 2025 |
| Knowledge cutoff | Dec 1, 2024 | Jan 2025 | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- MiMo-V2-Flash$1.60
- Step 3.5 Flash 2603$1.60
- Rnj-1 Instruct$1.80
Which should you choose?
Which is better: MiMo-V2-Flash, Step 3.5 Flash 2603 or Rnj-1 Instruct?
It is close. Our weighted score puts them within 3 points (Step 3.5 Flash 2603 63/100, MiMo-V2-Flash 60/100, Rnj-1 Instruct 50/100), so choose by what matters most for your work: MiMo-V2-Flash on price and MiMo-V2-Flash 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, MiMo-V2-Flash, Step 3.5 Flash 2603 or Rnj-1 Instruct?
MiMo-V2-Flash, Step 3.5 Flash 2603 and Rnj-1 Instruct cost the same: $0.10 input / $0.30 output per million tokens.
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. MiMo-V2-Flash has not been scored yet, Step 3.5 Flash 2603 has not been scored yet and Rnj-1 Instruct has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for MiMo-V2-Flash, Step 3.5 Flash 2603 and Rnj-1 Instruct 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?
MiMo-V2-Flash has the largest context window at 262,144 tokens, against 256,000 for Step 3.5 Flash 2603 and 32,768 for Rnj-1 Instruct. Maximum output per response: MiMo-V2-Flash up to 65,536, Step 3.5 Flash 2603 up to 256,000, Rnj-1 Instruct up to 32,768 tokens.
Which can read images, PDFs, audio or video?
MiMo-V2-Flash accepts text; Step 3.5 Flash 2603 accepts text; Rnj-1 Instruct accepts text. They handle the same number of input types.
Are any of these open source?
Yes, all three publish their weights (Apache 2.0), so you can self-host them.
Which is newer?
Step 3.5 Flash 2603 is the newest, released Apr 2, 2026. MiMo-V2-Flash came out Dec 16, 2025; Rnj-1 Instruct came out Dec 4, 2025. Knowledge cutoff: MiMo-V2-Flash Dec 1, 2024, Step 3.5 Flash 2603 Jan 2025.
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 Nov 2, 2026.
