Mercury 2

Mercury 2 is an extremely fast reasoning LLM, and the first reasoning diffusion LLM (dLLM). Instead of generating tokens sequentially, Mercury 2 produces and refines multiple tokens in parallel, achieving >1,000 tokens/sec on standard GPUs. Mercury 2 is 5x+ faster than leading speed-optimized LLMs like Claude 4.5 Haiku and GPT 5 Mini, at a fraction of the cost. Mercury 2 supports tunable reasoning levels, 128K context, native tool use, and schema-aligned JSON output. Built for coding workflows where latency compounds, real-time voice/search, and agent loops. OpenAI API compatible. Read more in the [blog post](https://www.inceptionlabs.ai/blog/introducing-mercury-2).

ChatInception128k tokens$0.2725 / $0.8175 · 1M

inception/mercury-2

Context
128k tokens
Completion cap
50,000
Tools
Yes
JSON
Yes
Released
2026-03-04

Call it from Geek Hub

Same OpenAI SDK. Change the base URL and the model id.

curl https://api.geekhub.mx/v1/chat/completions \
  -H "Authorization: Bearer $GEEKHUB_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "inception/mercury-2",
    "messages": [{"role": "user", "content": "Hola"}]
  }'
Get an API key

Frequently asked questions

What is Mercury 2?
Mercury 2 is an extremely fast reasoning LLM, and the first reasoning diffusion LLM (dLLM). Instead of generating tokens sequentially, Mercury 2 produces and refines multiple tokens in parallel, achieving >1,000 tokens/sec on standard GPUs. Mercury 2 is 5x+ faster than leading speed-optimized LLMs like Claude 4.5 Haiku and GPT 5 Mini, at a fraction of the cost. Mercury 2 supports tunable reasoning levels, 128K context, native tool use, and schema-aligned JSON output. Built for coding workflows where latency compounds, real-time voice/search, and agent loops. OpenAI API compatible. Read more in the [blog post](https://www.inceptionlabs.ai/blog/introducing-mercury-2). Mercury 2 runs on the Geek Hub API (OpenAI-compatible). Model id: inception/mercury-2.
Is Mercury 2 free?
No. Input is $0.2725 per 1M tokens and output is $0.8175 per 1M tokens on Geek Hub (markup included).
What is the context length of Mercury 2?
Mercury 2 has a 128k tokens context window. It supports up to 50,000 completion tokens.
Does Mercury 2 support tool calling and structured outputs?
Mercury 2 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.
When was Mercury 2 released?
Mercury 2 was released on 2026-03-04.