OpenAI: GPT-4o (batch) vs Z.ai: GLM 5: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing OpenAI: GPT-4o (batch) (openai/gpt-4o:batch) vs Z.ai: GLM 5 (z-ai/glm-5). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
OpenAI: GPT-4o (batch) (openai/gpt-4o:batch) 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 5 (z-ai/glm-5) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for Z.ai: GLM 5: 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.
In Etuki October 2026 FinOps telemetry comparing OpenAI: GPT-4o (batch) (API ID: openai/gpt-4o:batch) vs Z.ai: GLM 5 (API ID: z-ai/glm-5), Z.ai: GLM 5 offers lower standard input pricing at $1/1M tokens ($3.2/1M output), while Z.ai: GLM 5 leads in cached prefix economics at $0.5/1M tokens (50% discount). OpenAI: GPT-4o (batch) 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-4o (batch) | Z.ai: GLM 5 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | openai/gpt-4o:batch | z-ai/glm-5 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $1.25 / $5 | $1 / $3.2 | Z.ai: GLM 5 |
| Cache Read Price (per 1M) | $0.625/1M (50% Off) | $0.5/1M (50% Off) | Z.ai: GLM 5 |
| Context Window / Max Output | 125K In / 16K Out | 200K In / 128K Out | Z.ai: GLM 5 |
| P90 First-Token / Edge Latency | 280ms | 280ms | OpenAI: GPT-4o (batch) (-0ms) |
GPT-4o ("o" for "omni") is OpenAI's latest AI model, supporting both text and image inputs with text outputs. It maintains the intelligence level of [GPT-4 Turbo](/models/openai/gp
GLM-5 is Z.ai’s flagship open-source foundation model engineered for complex systems design and long-horizon agent workflows. Built for expert developers, it delivers production-gr
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-4o (batch) to Z.ai: GLM 5
GLM-5 is Z.ai’s flagship open-source foundation model engineered for complex systems design and long-horizon agent workflows. Built for expert developers, it delivers production-gr Verified P90 latency of 280ms.