OpenAI: GPT-4o (2024-11-20) vs Z.ai: GLM 5.2: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing OpenAI: GPT-4o (2024-11-20) (openai/gpt-4o-2024-11-20) vs Z.ai: GLM 5.2 (z-ai/glm-5.2). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
OpenAI: GPT-4o (2024-11-20) (openai/gpt-4o-2024-11-20) 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 5.2 (z-ai/glm-5.2) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for Z.ai: GLM 5.2: 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-4o (2024-11-20) (API ID: openai/gpt-4o-2024-11-20) vs Z.ai: GLM 5.2 (API ID: z-ai/glm-5.2), Z.ai: GLM 5.2 offers lower standard input pricing at $0.2/1M tokens ($10/1M output), while Z.ai: GLM 5.2 leads in cached prefix economics at $0.1/1M tokens (50% discount). OpenAI: GPT-4o (2024-11-20) 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 (2024-11-20) | Z.ai: GLM 5.2 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | openai/gpt-4o-2024-11-20 | z-ai/glm-5.2 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $2.5 / $10 | $0.2 / $10 | Z.ai: GLM 5.2 |
| Cache Read Price (per 1M) | $1.25/1M (50% Off) | $0.1/1M (50% Off) | Z.ai: GLM 5.2 |
| Context Window / Max Output | 125K In / 16K Out | 1024K In / 922K Out | Z.ai: GLM 5.2 |
| P90 First-Token / Edge Latency | 280ms | 280ms | OpenAI: GPT-4o (2024-11-20) (-0ms) |
The 2024-11-20 version of GPT-4o offers a leveled-up creative writing ability with more natural, engaging, and tailored writing to improve relevance & readability. It’s also better
GLM 5.2 is a large-scale reasoning model from Z.ai. It supports text input and output with a 1M-token context window, and is suited for long-horizon agent workflows, project-level
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 (2024-11-20) to Z.ai: GLM 5.2
GLM 5.2 is a large-scale reasoning model from Z.ai. It supports text input and output with a 1M-token context window, and is suited for long-horizon agent workflows, project-level Verified P90 latency of 280ms.