GPT-5-Codex is a specialized version of GPT-5 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks. The model supports…
Model details →OpenAI: GPT-5 Codex vs Z.ai: GLM 5
OpenAI: GPT-5 Codex and Z.ai: GLM 5 are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
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-grade performance on large-scale programming tasks, rivaling l…
Model details →Side-by-side comparison
| Capability | OpenAI: GPT-5 Codex | Z.ai: GLM 5 | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 400K | 80K | 🏆 OpenAI: GPT-5 Codex |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $1.25 | $0.72 | 🏆 Z.ai: GLM 5 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $10.00 | $2.30 | 🏆 Z.ai: GLM 5 |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | — | 🏆 OpenAI: GPT-5 Codex |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is OpenAI: GPT-5 Codex better than Z.ai: GLM 5?
OpenAI: GPT-5 Codex and Z.ai: GLM 5 are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
What's the price difference between OpenAI: GPT-5 Codex and Z.ai: GLM 5?
Input: $1.25 vs $0.72 per 1M tokens. Output: $10.00 vs $2.30 per 1M tokens.
What context windows do OpenAI: GPT-5 Codex and Z.ai: GLM 5 support?
OpenAI: GPT-5 Codex supports up to 400K tokens. Z.ai: GLM 5 supports up to 80K tokens.
Do both OpenAI: GPT-5 Codex and Z.ai: GLM 5 support tool calling?
OpenAI: GPT-5 Codex: yes. Z.ai: GLM 5: yes.