OpenAI: GPT-5.1-Codex-Max vs Z.ai: GLM 5.3: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing OpenAI: GPT-5.1-Codex-Max (openai/gpt-5.1-codex-max) vs Z.ai: GLM 5.3 (z-ai/glm-5.3). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
OpenAI: GPT-5.1-Codex-Max (openai/gpt-5.1-codex-max) 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 5.3 (z-ai/glm-5.3) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for Z.ai: GLM 5.3: Activate ephemeral prefix caching to slash input costs by 50% (down to $0.0395/1M) or route via asynchronous Batch API for 50% off standard token rates.
In Etuki October 2026 FinOps telemetry comparing OpenAI: GPT-5.1-Codex-Max (API ID: openai/gpt-5.1-codex-max) vs Z.ai: GLM 5.3 (API ID: z-ai/glm-5.3), Z.ai: GLM 5.3 offers lower standard input pricing at $0.079/1M tokens ($4.8/1M output), while Z.ai: GLM 5.3 leads in cached prefix economics at $0.0395/1M tokens (50% discount). OpenAI: GPT-5.1-Codex-Max 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-5.1-Codex-Max | Z.ai: GLM 5.3 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | openai/gpt-5.1-codex-max | z-ai/glm-5.3 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $1.25 / $10 | $0.079 / $4.8 | Z.ai: GLM 5.3 |
| Cache Read Price (per 1M) | $0.625/1M (50% Off) | $0.0395/1M (50% Off) | Z.ai: GLM 5.3 |
| Context Window / Max Output | 391K In / 125K Out | 1024K In / 922K Out | Z.ai: GLM 5.3 |
| P90 First-Token / Edge Latency | 280ms | 280ms | OpenAI: GPT-5.1-Codex-Max (-0ms) |
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasonin
GLM-5.3 is a large-scale reasoning model from Z.ai, built for complex software engineering and long-horizon agent tasks. It supports text input and output with a 1M-token context w
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-5.1-Codex-Max to Z.ai: GLM 5.3
GLM-5.3 is a large-scale reasoning model from Z.ai, built for complex software engineering and long-horizon agent tasks. It supports text input and output with a 1M-token context w Verified P90 latency of 280ms.