GPT-5 Mini is a compact version of GPT-5, designed to handle lighter-weight reasoning tasks. It provides the same instruction-following and safety-tuning benefits as GPT-5, but with reduced latency and cost....
Model details →OpenAI: GPT-5 Mini (batch) vs Union Alpha
OpenAI: GPT-5 Mini (batch) and Union Alpha are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
Union Alpha is a multimodal model built for research, coding, and agentic workflows, while delivering frontier-level performance across a broad range of general-purpose tasks. Union Alpha is a stealth model....
Model details →Side-by-side comparison
| Capability | OpenAI: GPT-5 Mini (batch) | Union Alpha | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 400K | 262K | 🏆 OpenAI: GPT-5 Mini (batch) |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.13 | $0.00 | 🏆 Union Alpha |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $1.00 | $0.00 | 🏆 Union Alpha |
| 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 | — | 🏆 OpenAI: GPT-5 Mini (batch) |
Frequently asked questions
Is OpenAI: GPT-5 Mini (batch) better than Union Alpha?
OpenAI: GPT-5 Mini (batch) and Union Alpha 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 Mini (batch) and Union Alpha?
Input: $0.13 vs $0.00 per 1M tokens. Output: $1.00 vs $0.00 per 1M tokens.
What context windows do OpenAI: GPT-5 Mini (batch) and Union Alpha support?
OpenAI: GPT-5 Mini (batch) supports up to 400K tokens. Union Alpha supports up to 262K tokens.
Do both OpenAI: GPT-5 Mini (batch) and Union Alpha support tool calling?
OpenAI: GPT-5 Mini (batch): yes. Union Alpha: yes.