LongCat-2.5-Preview vs Ornith 1.0 397B vs Step 5 Preview
Step 5 Preview comes out ahead, 72 to 60 and 51 on our weighted score, though LongCat-2.5-Preview is 9% cheaper per token.
Meituan (LongCat)LongCat-2.5-Preview
60/100- ECI—
- Price$0.75 / $2.95
- Context1M
DeepReinforce
Ornith 1.0 397B
51/100- ECI—
- Price—
- Context262K
- Our pick
StepFunStep 5 Preview
72/100- ECI—
- Price$1.00 / $2.70
- Context1M
Step 5 Preview is our pick
Step 5 Preview is the better all-round choice, scoring 72/100 against LongCat-2.5-Preview (60) and Ornith 1.0 397B (51). It leads on inputs & features. The score weighs inputs & features 60%, context window 40%. 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 priceLongCat-2.5-PreviewLongCat-2.5-Preview $1.30 · Step 5 Preview $1.43 per 1M tokens (3:1 blend) · Ornith 1.0 397B unpriced
- Longest contextLongCat-2.5-Preview and Step 5 PreviewLongCat-2.5-Preview 1,000,000 · Step 5 Preview 1,000,000 · Ornith 1.0 397B 262,144 tokens
- Widest inputsStep 5 PreviewLongCat-2.5-Preview: Text, Images · Ornith 1.0 397B: Text, Images · Step 5 Preview: Text, Images, Video
- Self-hostingOrnith 1.0 397BPublishes downloadable weights (MIT)
| Measure | Weight | LongCat-2.5-Preview | Ornith 1.0 397B | Step 5 Preview |
|---|---|---|---|---|
| Inputs & features | 60% | 60 | 60 | 80 |
| Context window | 40% | 60 | 37 | 60 |
| Overall | 100% | 60/100 | 51/100 | 72/100 |
Left out because at least one model lacks the data: capability and price. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | LongCat-2.5-PreviewMeituan (LongCat) | Ornith 1.0 397BDeepReinforce | Step 5 PreviewStepFun |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $0.75 (best) | — | $1.00 |
| Output | $2.95 | — | $2.70 (best) |
| Cached input | — | — | $0.05 |
| Blended (3:1) | $1.30 (best) | — | $1.43 |
| Long-context rate | Same rate | — | Same rate |
| Price source | Median of 1 providers | — | Official StepFun (Global) API |
| Limits | |||
| Context window | 1,000,000 tokens (best) | 262,144 tokens | 1,000,000 tokens (best) |
| Max output | 131,072 tokens | — | 1,000,000 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | No | No | No |
| Audio | No | No | No |
| Video | No | No | Yes |
| Reasoning | Yes | Yes | Yeslow · medium · high |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | No | Yes |
| Availability | |||
| Weights | Proprietary | OpenMIT | Proprietary |
| API model ID | — | — | step-5-preview |
| API providers | 2 | — | 7 (best) |
| Released | Sep 25, 2026 | Jun 25, 2026 | Sep 16, 2026 |
| Knowledge cutoff | — | — | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- LongCat-2.5-Preview$13.40
- Ornith 1.0 397B—
- Step 5 Preview$15.40
Which should you choose?
Which is better: LongCat-2.5-Preview, Ornith 1.0 397B or Step 5 Preview?
Step 5 Preview is the better all-round choice, scoring 72/100 against LongCat-2.5-Preview (60) and Ornith 1.0 397B (51). It leads on inputs & features. The score weighs inputs & features 60%, context window 40%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, LongCat-2.5-Preview, Ornith 1.0 397B or Step 5 Preview?
LongCat-2.5-Preview is cheaper at $0.75 input / $2.95 output per million tokens (median across 1 API provider). Step 5 Preview costs $1.00 input / $2.70 output per million tokens (official StepFun (Global) API price). At a typical mix of three input tokens to one output token, that is $1.30 per million tokens for LongCat-2.5-Preview versus $1.43 for Step 5 Preview (1.1× as much). Ornith 1.0 397B has no published per-token price.
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. LongCat-2.5-Preview has not been scored yet, Ornith 1.0 397B has not been scored yet and Step 5 Preview has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for LongCat-2.5-Preview, Ornith 1.0 397B and Step 5 Preview 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?
LongCat-2.5-Preview and Step 5 Preview have the largest context windows (1,000,000 and 1,000,000 tokens), against 262,144 for Ornith 1.0 397B. Maximum output per response: LongCat-2.5-Preview up to 131,072, Step 5 Preview up to 1,000,000 tokens.
Which can read images, PDFs, audio or video?
LongCat-2.5-Preview accepts text and images; Ornith 1.0 397B accepts text and images; Step 5 Preview accepts text, images and video. Step 5 Preview handles the widest range of inputs.
Are any of these open source?
Ornith 1.0 397B publishes its weights (MIT) and can be self-hosted; LongCat-2.5-Preview and Step 5 Preview is proprietary.
Which is newer?
LongCat-2.5-Preview is the newest, released Sep 25, 2026. Step 5 Preview came out Sep 16, 2026; Ornith 1.0 397B came out Jun 25, 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.
