DeepSeek: DeepSeek V3 vs StepFun: Step 3.7 Flash: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing DeepSeek: DeepSeek V3 (deepseek/deepseek-chat) vs StepFun: Step 3.7 Flash (stepfun/step-3.7-flash). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
DeepSeek: DeepSeek V3 (deepseek/deepseek-chat) — Automatic Disk KV Cache ($0.16/1M) & Off-Peak Promo
DeepSeek-V4 Pro (1.6T MoE) automatically caches repeated 64-token prompt prefixes on NVMe storage at $0.07/1M input tokens (50% off $0.14 base) with zero code changes required, plus off-peak UTC scheduling discounts.
StepFun: Step 3.7 Flash (stepfun/step-3.7-flash) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for StepFun: Step 3.7 Flash: Activate ephemeral prefix caching to slash input costs by 50% (down to $0.1/1M) or route via asynchronous Batch API for 50% off standard token rates.
In Etuki October 2026 FinOps telemetry comparing DeepSeek: DeepSeek V3 (API ID: deepseek/deepseek-chat) vs StepFun: Step 3.7 Flash (API ID: stepfun/step-3.7-flash), StepFun: Step 3.7 Flash offers lower standard input pricing at $0.2/1M tokens ($1.15/1M output), while StepFun: Step 3.7 Flash leads in cached prefix economics at $0.1/1M tokens (50% discount). DeepSeek: DeepSeek V3 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 | DeepSeek: DeepSeek V3 | StepFun: Step 3.7 Flash | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | deepseek/deepseek-chat | stepfun/step-3.7-flash | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $0.32 / $0.89 | $0.2 / $1.15 | StepFun: Step 3.7 Flash |
| Cache Read Price (per 1M) | $0.16/1M (50% Off) | $0.1/1M (50% Off) | StepFun: Step 3.7 Flash |
| Context Window / Max Output | 160K In / 16K Out | 256K In / 225K Out | StepFun: Step 3.7 Flash |
| P90 First-Token / Edge Latency | 280ms | 280ms | DeepSeek: DeepSeek V3 (-0ms) |
DeepSeek-V3 is the latest model from the DeepSeek team, building upon the instruction following and coding abilities of the previous versions. Pre-trained on nearly 15 trillion tok
Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model. It pairs a 196B-parameter language backbone with a vision encoder for native image and video
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 DeepSeek: DeepSeek V3 to StepFun: Step 3.7 Flash
Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model. It pairs a 196B-parameter language backbone with a vision encoder for native image and video Verified P90 latency of 280ms.