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....
Model details →OpenAI: GPT-5 Codex (batch) vs Z.ai: GLM 5.1
OpenAI: GPT-5 Codex (batch) wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks. Unlike previous models built around minute-level interactions, GLM-5.1 can work independently and continuously on...
Model details →Side-by-side comparison
| Capability | OpenAI: GPT-5 Codex (batch) | Z.ai: GLM 5.1 | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 400K | 205K | 🏆 OpenAI: GPT-5 Codex (batch) |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.63 | $0.95 | 🏆 OpenAI: GPT-5 Codex (batch) |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $5.00 | $2.99 | 🏆 Z.ai: GLM 5.1 |
| 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 (batch) |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is OpenAI: GPT-5 Codex (batch) better than Z.ai: GLM 5.1?
OpenAI: GPT-5 Codex (batch) wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between OpenAI: GPT-5 Codex (batch) and Z.ai: GLM 5.1?
Input: $0.63 vs $0.95 per 1M tokens. Output: $5.00 vs $2.99 per 1M tokens.
What context windows do OpenAI: GPT-5 Codex (batch) and Z.ai: GLM 5.1 support?
OpenAI: GPT-5 Codex (batch) supports up to 400K tokens. Z.ai: GLM 5.1 supports up to 205K tokens.
Do both OpenAI: GPT-5 Codex (batch) and Z.ai: GLM 5.1 support tool calling?
OpenAI: GPT-5 Codex (batch): yes. Z.ai: GLM 5.1: yes.
Compare OpenAI: GPT-5 Codex (batch) with other models
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