OpenAI: GPT-4.1 (batch) vs Z.ai: GLM 4.5 Air: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing OpenAI: GPT-4.1 (batch) (openai/gpt-4.1:batch) vs Z.ai: GLM 4.5 Air (z-ai/glm-4.5-air). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
OpenAI: GPT-4.1 (batch) (openai/gpt-4.1: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 4.5 Air (z-ai/glm-4.5-air) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for Z.ai: GLM 4.5 Air: Activate ephemeral prefix caching to slash input costs by 50% (down to $0.065/1M) or route via asynchronous Batch API for 50% off standard token rates.
In Etuki October 2026 FinOps telemetry comparing OpenAI: GPT-4.1 (batch) (API ID: openai/gpt-4.1:batch) vs Z.ai: GLM 4.5 Air (API ID: z-ai/glm-4.5-air), Z.ai: GLM 4.5 Air offers lower standard input pricing at $0.13/1M tokens ($0.85/1M output), while Z.ai: GLM 4.5 Air leads in cached prefix economics at $0.065/1M tokens (50% discount). OpenAI: GPT-4.1 (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-4.1 (batch) | Z.ai: GLM 4.5 Air | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | openai/gpt-4.1:batch | z-ai/glm-4.5-air | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $1 / $4 | $0.13 / $0.85 | Z.ai: GLM 4.5 Air |
| Cache Read Price (per 1M) | $0.5/1M (50% Off) | $0.065/1M (50% Off) | Z.ai: GLM 4.5 Air |
| Context Window / Max Output | 1023K In / 32K Out | 128K In / 96K Out | Z.ai: GLM 4.5 Air |
| P90 First-Token / Edge Latency | 280ms | 280ms | OpenAI: GPT-4.1 (batch) (-0ms) |
GPT-4.1 is a flagship large language model optimized for advanced instruction following, real-world software engineering, and long-context reasoning. It supports a 1 million token
GLM-4.5-Air is the lightweight variant of our latest flagship model family, also purpose-built for agent-centric applications. Like GLM-4.5, it adopts the Mixture-of-Experts (MoE)
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-4.1 (batch) to Z.ai: GLM 4.5 Air
GLM-4.5-Air is the lightweight variant of our latest flagship model family, also purpose-built for agent-centric applications. Like GLM-4.5, it adopts the Mixture-of-Experts (MoE) Verified P90 latency of 280ms.