OpenAI: GPT-5 Image Mini vs StepFun: Step 3.7 Flash: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing OpenAI: GPT-5 Image Mini (openai/gpt-5-image-mini) vs StepFun: Step 3.7 Flash (stepfun/step-3.7-flash). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
OpenAI: GPT-5 Image Mini (openai/gpt-5-image-mini) Startup Credits & Batch API 50% Off Promo
OpenAI GPT-6.1 Sol ($2/$10 base rate) qualifies for immediate 75% automatic prefix caching ($0.50/1M), 50% off 24-hour Batch API completions ($1/$5), and up to $150,000 in OpenAI/Azure Foundry credits via Microsoft for Startups Founders Hub (no VC funding required for initial tiers).
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 OpenAI: GPT-5 Image Mini (API ID: openai/gpt-5-image-mini) 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). OpenAI: GPT-5 Image Mini 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 | OpenAI: GPT-5 Image Mini | StepFun: Step 3.7 Flash | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | openai/gpt-5-image-mini | stepfun/step-3.7-flash | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $2.5 / $2 | $0.2 / $1.15 | StepFun: Step 3.7 Flash |
| Cache Read Price (per 1M) | $1.25/1M (50% Off) | $0.1/1M (50% Off) | StepFun: Step 3.7 Flash |
| Context Window / Max Output | 391K In / 125K Out | 256K In / 225K Out | StepFun: Step 3.7 Flash |
| P90 First-Token / Edge Latency | 280ms | 280ms | OpenAI: GPT-5 Image Mini (-0ms) |
GPT-5 Image Mini combines OpenAI's advanced language capabilities, powered by [GPT-5 Mini](https://openrouter.ai/openai/gpt-5-mini), with GPT Image 1 Mini for efficient image gener
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 OpenAI: GPT-5 Image Mini 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.