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Inception: Mercury 2.5 Preview

Source description (English)

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...

Overview

Model specifications

Context
260,000 tokens
Maximum output
65,536 tokens
Architecture
text->text
Tokenizer
Other
Knowledge cutoff
Not provided
Moderated
No
OPENROUTER

Complete pricing

Synchronized OpenRouter rates. Token prices are shown per one million tokens.

Input
$0.04
per 1M tokens
Output
$0.15
per 1M tokens
Cache read
$0.004
per 1M tokens
API

Model configuration

Reasoning

Reasoning required
No
Default parameters
medium
Capabilities
high, medium, low, none
API

Quick start

Set OPENROUTER_API_KEY locally. Python requires requests; JavaScript runs in Node.js. Keep the key on the server.

API documentation

curl --fail-with-body https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"inception/mercury-2.5-preview","messages":[{"role":"user","content":"Hello!"}]}'
Capabilities

InputOutput

Input
text
Output
text
Reasoning

Yes · high · medium · low · none

API

Supported API parameters

include_reasoningmax_tokensreasoningreasoning_effortresponse_formatstopstructured_outputstemperaturetool_choicetools
Available providers

1 Provider

Checked: September 7, 2026

Live providers on OpenRouter

Provider availability, latency, throughput and routing can change continuously. Open the source page for current operational data.

OpenRouter

Inception

Not provided
Context
260K
Maximum output
66K
Input
$0.04
Output
$0.15
Cache read
$0.004
Cache write
Not provided
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