Mercury 2

by inception · family mercury

Facts

Release date	2026-03-04
Retired date	—
Knowledge cutoff	—
Context (max)	128,000
Max output	—
Modalities	text → text
Aliases	`mercury-2`
Open weights	no
Description	First commercial reasoning diffusion LLM (dLLM): parallel generate-and-refine decoding, 1000+ tok/s on H100-class hardware, ~300ms reasoning latency. 128K context, up to 50K output. $0.25/$0.75 per Mtok, cache $0.025. reasoning_effort instant/low/medium/high.

Unknown values are shown as —.

Offerings

Provider	Wire ID	Variant	Endpoint	Protocol	Status	Price (USD / Mtok)	Reasoning
OpenRouter	`inception/mercury-2`		chat-completions	openai-chat	ga	0.25 / 0.75	effort · default on · returns reasoning_content

Reasoning controls

OpenRouter· inception/mercury-2· chat-completions effort

reasoning_effort lowmediumhigh●

effort · default on · returns reasoning_content

Example requests

OpenRouter · openai-chat · inception/mercury-2

curl 'https://openrouter.ai/api/v1/chat/completions' \
  -H 'Authorization: Bearer <YOUR_API_KEY>' \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "inception/mercury-2",
  "messages": [
    {
      "role": "user",
      "content": "Tell me about the weather."
    }
  ],
  "reasoning_effort": "high"
}'

Python (requests)

import requests

resp = requests.post(
    "https://openrouter.ai/api/v1/chat/completions",
    headers={
      "Authorization": "Bearer <YOUR_API_KEY>",
      "Content-Type": "application/json"
    },
    json={
      "model": "inception/mercury-2",
      "messages": [
        {
          "role": "user",
          "content": "Tell me about the weather."
        }
      ],
      "reasoning_effort": "high"
    },
)
print(resp.json())

TypeScript (fetch)

const resp = await fetch("https://openrouter.ai/api/v1/chat/completions", {
  method: "POST",
  headers: {
    "Authorization": "Bearer <YOUR_API_KEY>",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "model": "inception/mercury-2",
    "messages": [
      {
        "role": "user",
        "content": "Tell me about the weather."
      }
    ],
    "reasoning_effort": "high"
  }),
})
console.log(await resp.json())