Mercury 2.5 is the fastest reasoning LLM, and the latest diffusion LLM (dLLM) from Inception. Instead of generating tokens sequentially, Mercury 2.5 produces and refines multiple tokens in parallel, achieving...
Model details →Inception: Mercury 2.5 Preview vs OpenAI: GPT-5 Mini
Inception: Mercury 2.5 Preview and OpenAI: GPT-5 Mini are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
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 →Side-by-side comparison
| Capability | Inception: Mercury 2.5 Preview | OpenAI: GPT-5 Mini | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 260K | 400K | 🏆 OpenAI: GPT-5 Mini |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.04 | $0.25 | 🏆 Inception: Mercury 2.5 Preview |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $0.15 | $2.00 | 🏆 Inception: Mercury 2.5 Preview |
| 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 Mini |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Inception: Mercury 2.5 Preview better than OpenAI: GPT-5 Mini?
Inception: Mercury 2.5 Preview and OpenAI: GPT-5 Mini are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
What's the price difference between Inception: Mercury 2.5 Preview and OpenAI: GPT-5 Mini?
Input: $0.04 vs $0.25 per 1M tokens. Output: $0.15 vs $2.00 per 1M tokens.
What context windows do Inception: Mercury 2.5 Preview and OpenAI: GPT-5 Mini support?
Inception: Mercury 2.5 Preview supports up to 260K tokens. OpenAI: GPT-5 Mini supports up to 400K tokens.
Do both Inception: Mercury 2.5 Preview and OpenAI: GPT-5 Mini support tool calling?
Inception: Mercury 2.5 Preview: yes. OpenAI: GPT-5 Mini: yes.