OpenAI: GPT-5.6 Luna vs Z.ai: GLM Flash Latest: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing OpenAI: GPT-5.6 Luna (openai/gpt-5.6-luna) vs Z.ai: GLM Flash Latest (~z-ai/glm-flash-latest). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
OpenAI: GPT-5.6 Luna (openai/gpt-5.6-luna) 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).
Z.ai: GLM Flash Latest (~z-ai/glm-flash-latest) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for Z.ai: GLM Flash Latest: Activate ephemeral prefix caching to slash input costs by 50% (down to $0.018/1M) or route via asynchronous Batch API for 50% off standard token rates.
In Etuki October 2026 FinOps telemetry comparing OpenAI: GPT-5.6 Luna (API ID: openai/gpt-5.6-luna) vs Z.ai: GLM Flash Latest (API ID: ~z-ai/glm-flash-latest), Z.ai: GLM Flash Latest offers lower standard input pricing at $0.036/1M tokens ($0.9/1M output), while Z.ai: GLM Flash Latest leads in cached prefix economics at $0.018/1M tokens (50% discount). OpenAI: GPT-5.6 Luna 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-5.6 Luna | Z.ai: GLM Flash Latest | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | openai/gpt-5.6-luna | ~z-ai/glm-flash-latest | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $0.2 / $1.2 | $0.036 / $0.9 | Z.ai: GLM Flash Latest |
| Cache Read Price (per 1M) | $0.1/1M (50% Off) | $0.018/1M (50% Off) | Z.ai: GLM Flash Latest |
| Context Window / Max Output | 1025K In / 125K Out | 1024K In / 922K Out | Z.ai: GLM Flash Latest |
| P90 First-Token / Edge Latency | 280ms | 280ms | OpenAI: GPT-5.6 Luna (-0ms) |
GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic
This model always redirects to the latest model in the GLM Flash family.
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-5.6 Luna to Z.ai: GLM Flash Latest
This model always redirects to the latest model in the GLM Flash family. Verified P90 latency of 280ms.