StepFun: Step 5 Preview vs AionLabs: Aion 3.5 Mini: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing StepFun: Step 5 Preview (stepfun/step-5-preview) vs AionLabs: Aion 3.5 Mini (aion-labs/aion-3.5-mini). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
StepFun: Step 5 Preview (stepfun/step-5-preview) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for StepFun: Step 5 Preview: Activate ephemeral prefix caching to slash input costs by 50% (down to $0.5/1M) or route via asynchronous Batch API for 50% off standard token rates.
AionLabs: Aion 3.5 Mini (aion-labs/aion-3.5-mini) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for AionLabs: Aion 3.5 Mini: Activate ephemeral prefix caching to slash input costs by 50% (down to $0.35/1M) or route via asynchronous Batch API for 50% off standard token rates.
In Etuki October 2026 FinOps telemetry comparing StepFun: Step 5 Preview (API ID: stepfun/step-5-preview) vs AionLabs: Aion 3.5 Mini (API ID: aion-labs/aion-3.5-mini), AionLabs: Aion 3.5 Mini offers lower standard input pricing at $0.7/1M tokens ($1.4/1M output), while AionLabs: Aion 3.5 Mini leads in cached prefix economics at $0.35/1M tokens (50% discount). StepFun: Step 5 Preview achieves a 0ms faster P90 time-to-first-token latency (280ms vs 280ms).
Auto-discovered via live global telemetry registry.
Auto-discovered via live global telemetry registry.
| Specification / FinOps Dimension | StepFun: Step 5 Preview | AionLabs: Aion 3.5 Mini | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | stepfun/step-5-preview | aion-labs/aion-3.5-mini | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $1 / $2.7 | $0.7 / $1.4 | AionLabs: Aion 3.5 Mini |
| Cache Read Price (per 1M) | $0.5/1M (50% Off) | $0.35/1M (50% Off) | AionLabs: Aion 3.5 Mini |
| Context Window / Max Output | 1024K In / 63K Out | 256K In / 32K Out | StepFun: Step 5 Preview |
| P90 First-Token / Edge Latency | 280ms | 280ms | StepFun: Step 5 Preview (-0ms) |
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 softwar
Aion 3.5 Mini is a multi-model roleplaying and storytelling system from AionLabs, built on the GLM family of models. It is the smaller, lower-cost sibling of Aion 3.5 and uses...
Real-Time Stack Cost & Hidden-Fee Simulator (MAU / Token / Egress / GMV)
Calibrated with Reddit r/FinOps & r/devops telemetry: Includes Context Caching, Bandwidth Egress, and MoR Tax
🛰️Switch from StepFun: Step 5 Preview to AionLabs: Aion 3.5 Mini
Aion 3.5 Mini is a multi-model roleplaying and storytelling system from AionLabs, built on the GLM family of models. It is the smaller, lower-cost sibling of Aion 3.5 and uses... Verified P90 latency of 280ms.