Inception · Efficient

Mercury 2.5 Preview

Added Sep 1, 2026

Mercury 2.5 Preview is Inception's latest and most intelligent diffusion language model. Instead of generating tokens strictly one at a time, it produces and refines multiple tokens in parallel, reaching up to 1,107 tokens per second on standard GPUs. It delivers a 10+ point intelligence gain over Mercury 2, with tunable reasoning, parallel tool calls, schema-aligned JSON output, and a 260K context window. It is built for latency-sensitive production work such as search agents, voice pipelines, customer support, rapid coding iteration, and coding subagents.

Reasoning
Tools
Structured output
Parallel tools

Input: Text
Output: Text
Reasoning effort: none · low · medium · high
Discovery tier: Efficient

Pricing

USD per 1M tokens

Input: $0.04
Output: $0.15
Cache read: $0.004

Reference prices as published by the model provider. API example

Specifications

Context window: 260K
Max output: 65.5K
Average output (7 days): 1.2K tokens; Longer than 78% of 465 models

Side by side

Compare models

Put Mercury 2.5 Preview next to up to three other models. The comparison stays in the link, so you can share it.

TryDoubao Seed 2.0 Mini Qwen Turbo LFM2.5 24B A2B All 3

Public evaluations

Benchmarks

There are no public benchmark results for Mercury 2.5 Preview yet.

Live routing data

Performance and reliability

Recent averages across requests routed for this model. Your own speed depends on prompt length, reasoning effort and load.

Prompt cache hits: 0.0%; About $0.04 per 1M input tokens with caching
Request success (24h): 100.0%; Reliable

Cache hits are the share of input tokens recently served from a prompt cache across all requests. They are not a forecast of your own hit rate.

Hourly request success · last 72 hoursLowest hour 100.0%

Healthy (98% or more)
Degraded (90–98%)
Down (under 90%)
No requests

Developers

Use it through the API

Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.

Read the quickstart

curl https://www.noumen.xyz/api/v1/chat/completions \
  -H "Authorization: Bearer $NOUMEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "inception/mercury-2.5-preview",
    "reasoning_effort": "medium",
    "messages": [{ "role": "user", "content": "Explain this stack trace." }]
  }'

import os
from openai import OpenAI

client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
    model="inception/mercury-2.5-preview",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

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