GPT-5 Image Mini combines OpenAI's advanced language capabilities, powered by [GPT-5 Mini](https://openrouter.ai/openai/gpt-5-mini), with GPT Image 1 Mini for efficient image generation. This natively multimodal model features superior inst…
Model details →OpenAI: GPT-5 Image Mini vs SpaceXAI: Grok 4.5
SpaceXAI: Grok 4.5 wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
Grok 4.5 is a model from SpaceXAI with frontier performance on coding, knowledge work, and STEM.
Model details →Side-by-side comparison
| Capability | OpenAI: GPT-5 Image Mini | SpaceXAI: Grok 4.5 | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 400K | 500K | 🏆 SpaceXAI: Grok 4.5 |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $2.50 | $2.00 | 🏆 SpaceXAI: Grok 4.5 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $2.00 | $6.00 | 🏆 OpenAI: GPT-5 Image Mini |
| Tool / function calling First-class support for emitting structured tool calls. | — | Yes | 🏆 SpaceXAI: Grok 4.5 |
| 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 Image Mini better than SpaceXAI: Grok 4.5?
SpaceXAI: Grok 4.5 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 Image Mini and SpaceXAI: Grok 4.5?
Input: $2.50 vs $2.00 per 1M tokens. Output: $2.00 vs $6.00 per 1M tokens.
What context windows do OpenAI: GPT-5 Image Mini and SpaceXAI: Grok 4.5 support?
OpenAI: GPT-5 Image Mini supports up to 400K tokens. SpaceXAI: Grok 4.5 supports up to 500K tokens.
Do both OpenAI: GPT-5 Image Mini and SpaceXAI: Grok 4.5 support tool calling?
OpenAI: GPT-5 Image Mini: not advertised. SpaceXAI: Grok 4.5: yes.