Aion-1.0 is a multi-model system designed for high performance across various tasks, including reasoning and coding. It is built on DeepSeek-R1, augmented with additional models and techniques such as Tree of Thoughts (ToT) and Mixture of E…
Model details →AionLabs: Aion-1.0 vs StepFun: Step 5 Preview
StepFun: Step 5 Preview wins on 5 of 6 axes — pricing and capability skew in its favour for most workloads.
Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...
Model details →Side-by-side comparison
| Capability | AionLabs: Aion-1.0 | StepFun: Step 5 Preview | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 131K | 1M | 🏆 StepFun: Step 5 Preview |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $4.00 | $1.00 | 🏆 StepFun: Step 5 Preview |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $8.00 | $2.70 | 🏆 StepFun: Step 5 Preview |
| Tool / function calling First-class support for emitting structured tool calls. | — | Yes | 🏆 StepFun: Step 5 Preview |
| Vision input Accepts image inputs alongside text. | — | Yes | 🏆 StepFun: Step 5 Preview |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is AionLabs: Aion-1.0 better than StepFun: Step 5 Preview?
StepFun: Step 5 Preview wins on 5 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between AionLabs: Aion-1.0 and StepFun: Step 5 Preview?
Input: $4.00 vs $1.00 per 1M tokens. Output: $8.00 vs $2.70 per 1M tokens.
What context windows do AionLabs: Aion-1.0 and StepFun: Step 5 Preview support?
AionLabs: Aion-1.0 supports up to 131K tokens. StepFun: Step 5 Preview supports up to 1M tokens.
Do both AionLabs: Aion-1.0 and StepFun: Step 5 Preview support tool calling?
AionLabs: Aion-1.0: not advertised. StepFun: Step 5 Preview: yes.