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 workflows, providing capable reasoning for...
Model details →OpenAI: GPT-5.6 Luna vs Z.ai: GLM 5.3 Flash (batch)
Z.ai: GLM 5.3 Flash (batch) wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
GLM-5.3-Flash is a native multimodal model from Z.ai. It is suited for efficient coding and long-horizon agent tasks. Its hybrid sparse and linear attention architecture maintains accurate long-context behavior while...
Model details →Side-by-side comparison
| Capability | OpenAI: GPT-5.6 Luna | Z.ai: GLM 5.3 Flash (batch) | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1.1M | 1.0M | 🏆 OpenAI: GPT-5.6 Luna |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.20 | $0.15 | 🏆 Z.ai: GLM 5.3 Flash (batch) |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $1.20 | $0.50 | 🏆 Z.ai: GLM 5.3 Flash (batch) |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is OpenAI: GPT-5.6 Luna better than Z.ai: GLM 5.3 Flash (batch)?
Z.ai: GLM 5.3 Flash (batch) wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between OpenAI: GPT-5.6 Luna and Z.ai: GLM 5.3 Flash (batch)?
Input: $0.20 vs $0.15 per 1M tokens. Output: $1.20 vs $0.50 per 1M tokens.
What context windows do OpenAI: GPT-5.6 Luna and Z.ai: GLM 5.3 Flash (batch) support?
OpenAI: GPT-5.6 Luna supports up to 1.1M tokens. Z.ai: GLM 5.3 Flash (batch) supports up to 1.0M tokens.
Do both OpenAI: GPT-5.6 Luna and Z.ai: GLM 5.3 Flash (batch) support tool calling?
OpenAI: GPT-5.6 Luna: yes. Z.ai: GLM 5.3 Flash (batch): yes.