StepFun: Step 5 Preview vs Qwen: Qwen3.5 Plus 2026-02-15: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing StepFun: Step 5 Preview (stepfun/step-5-preview) vs Qwen: Qwen3.5 Plus 2026-02-15 (qwen/qwen3.5-plus-02-15). 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.
Qwen: Qwen3.5 Plus 2026-02-15 (qwen/qwen3.5-plus-02-15) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for Qwen: Qwen3.5 Plus 2026-02-15: Activate ephemeral prefix caching to slash input costs by 50% (down to $0.13/1M) 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 Qwen: Qwen3.5 Plus 2026-02-15 (API ID: qwen/qwen3.5-plus-02-15), Qwen: Qwen3.5 Plus 2026-02-15 offers lower standard input pricing at $0.26/1M tokens ($1.56/1M output), while Qwen: Qwen3.5 Plus 2026-02-15 leads in cached prefix economics at $0.13/1M 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 | Qwen: Qwen3.5 Plus 2026-02-15 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | stepfun/step-5-preview | qwen/qwen3.5-plus-02-15 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $1 / $2.7 | $0.26 / $1.56 | Qwen: Qwen3.5 Plus 2026-02-15 |
| Cache Read Price (per 1M) | $0.5/1M (50% Off) | $0.13/1M (50% Off) | Qwen: Qwen3.5 Plus 2026-02-15 |
| Context Window / Max Output | 1024K In / 63K Out | 977K In / 64K Out | Qwen: Qwen3.5 Plus 2026-02-15 |
| 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
The Qwen3.5 native vision-language series Plus models are built on a hybrid architecture that integrates linear attention mechanisms with sparse mixture-of-experts models, achievin
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 Qwen: Qwen3.5 Plus 2026-02-15
The Qwen3.5 native vision-language series Plus models are built on a hybrid architecture that integrates linear attention mechanisms with sparse mixture-of-experts models, achievin Verified P90 latency of 280ms.