StepFun Step 2 Mini vs Moonshot Kimi K2.5 (Latest 2026 Flagship): Live Promos, Pricing, Hidden Fees & Latency
StepFun Step 2 Mini (stepfun/step-2-mini) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for StepFun Step 2 Mini: Activate ephemeral prefix caching to slash input costs by 90% (down to 0.01/1M) or route via asynchronous Batch API for 50% off standard token rates.
Moonshot Kimi K2.5 (Latest 2026 Flagship) (moonshotai/kimi-k2.5) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for Moonshot Kimi K2.5 (Latest 2026 Flagship): Activate ephemeral prefix caching to slash input costs by 90% (down to 0.055/1M) or route via asynchronous Batch API for 50% off standard token rates.
In Etuki October 2026 FinOps telemetry comparing StepFun Step 2 Mini (API ID: stepfun/step-2-mini) vs Moonshot Kimi K2.5 (Latest 2026 Flagship) (API ID: moonshotai/kimi-k2.5), StepFun Step 2 Mini offers lower standard input pricing at $0.1/1M tokens ($0.3/1M output), while StepFun Step 2 Mini leads in cached prefix economics at $0.01/1M tokens (90% discount). StepFun Step 2 Mini achieves a 0ms faster P90 time-to-first-token latency (195ms vs 195ms).
Gateway-synced rate ($0.1/$0.3 per 1M, flat 32K window). Verify upstream provider cache TTL and regional routing before high-volume batch runs.
Enable Prompt Context Caching & Batch API to reduce repeated system prompt input token burn by 50%-97.5%.
| Specification / FinOps Dimension | StepFun Step 2 Mini | Moonshot Kimi K2.5 (Latest 2026 Flagship) | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | stepfun/step-2-mini | moonshotai/kimi-k2.5 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $0.1 / $0.3 | $0.55 / $2.2 | StepFun Step 2 Mini |
| Cache Read Price (per 1M) | $0.01/1M (90% Off) | $0.055/1M (90% Off) | StepFun Step 2 Mini |
| Context Window / Max Output | 32K In / 64K Out | 256K In / 128K Out | Moonshot Kimi K2.5 (Latest 2026 Flagship) |
| P90 First-Token / Edge Latency | 195ms | 195ms | StepFun Step 2 Mini (-0ms) |
StepFun Step 2 Mini (stepfun/step-2-mini): OpenRouter gateway-synced model at $0.1/1M input, $0.3/1M output, $0.01/1M cached input (32K context window).
Moonshot AI latest flagship 1T MoE coding & agentic reasoning model ($0.55/$2.20 per 1M, $0.055 cache read [90% off], 256K context window).
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 2 Mini to Moonshot Kimi K2.5 (Latest 2026 Flagship)
Moonshot AI latest flagship 1T MoE coding & agentic reasoning model ($0.55/$2.20 per 1M, $0.055 cache read [90% off], 256K context window). Verified P90 latency of 195ms.