Mercury 2.5 Preview

mercury-2.5-preview · Inception

Mercury 2.5 is the latest diffusion-based large language model (dLLM) released by Inception. It is the fastest inference LLM; unlike the sequential token-by-token generation approach, Mercury 2.5 can generate and optimize multiple tokens in parallel, achieving a generation speed of 1,107 tokens per second on standard GPUs. Compared to Mercury 2, its intelligence has increased by more than 10 percentage points, and its quality rivals leading cost-optimized frontier models such as GPT-5.6 Luna (Low), Gemini 3.5 Flash-Lite, and Claude Haiku 4.5.

API Pricing

Input$0.2$0.04 / 1M tokens
Output$0.75$0.15 / 1M tokens
Cache read$0.02$0.004 / 1M tokens

80% off

Specifications

Context260K tokens
Modalitiestext
Featuresthinking, tool calling

Frequently asked questions

What is Mercury 2.5 Preview?

Mercury 2.5 is the latest diffusion-based large language model (dLLM) released by Inception. It is the fastest inference LLM; unlike the sequential token-by-token generation approach, Mercury 2.5 can generate and optimize multiple tokens in parallel, achieving a generation speed of 1,107 tokens per second on standard GPUs. Compared to Mercury 2, its intelligence has increased by more than 10 percentage points, and its quality rivals leading cost-optimized frontier models such as GPT-5.6 Luna (Low), Gemini 3.5 Flash-Lite, and Claude Haiku 4.5.

What is the context length of Mercury 2.5 Preview?

Mercury 2.5 Preview has a 260,000 token context window.

How much does Mercury 2.5 Preview cost?

On AIHubMix, Mercury 2.5 Preview costs $0.04 per million input tokens and $0.15 per million output tokens. Cached input reads are billed at $0.004 per million tokens. These are promotional rates — 80% off.

What modalities does Mercury 2.5 Preview support?

Mercury 2.5 Preview accepts text input.

What capabilities does Mercury 2.5 Preview support?

Mercury 2.5 Preview supports thinking and tool calling. Per-protocol parameter support is listed in the capability table on this page.

How do I call Mercury 2.5 Preview via API?

Mercury 2.5 Preview is available through the AIHubMix unified API. The API is OpenAI-compatible: point your OpenAI SDK at https://aihubmix.com/v1, use your AIHubMix API key, and set the model name to mercury-2.5-preview — no other code changes needed.

Who created Mercury 2.5 Preview?

Mercury 2.5 Preview is developed by Inception. AIHubMix aggregates it alongside models from other providers behind one API and one bill.

When was Mercury 2.5 Preview released?

Mercury 2.5 Preview was released on September 2, 2026 by Inception.

Use Mercury 2.5 Preview via the AIHubMix unified API — one interface for every major LLM.