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Inception: Mercury 3

Source description (English)

Mercury 3 is a diffusion-based language model from Inception, and the lab's most capable model to date. It is suited for agentic workflows and real-time applications where latency compounds, such...

View source on OpenRouter
Overview

Model specifications

Context
1,000,000 tokens
Maximum output
131,072 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
$0.1
per 1M tokens
Output
$0.35
per 1M tokens
Cache read
$0.01
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-3","messages":[{"role":"user","content":"Hello!"}]}'
Capabilities

Input → Output

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: October 19, 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
1M
Maximum output
131K
Input
$0.1
Output
$0.35
Cache read
$0.01
Cache write
Not provided
inception

4 models

All models
inception logoinception

Inception: Mercury Decide

Mercury Decide is Inception's structured decision model, served as a System One endpoint. Send a state along with typed questions, and it returns a choice, a score, or a yes/no...

Context
66K
Input
text · image
Output
decisions
Input: $0.02 per 1M tokensOutput: Free per 1M tokens
View model details →
inception logoinception

Inception: Mercury Decide (free)

Mercury Decide is Inception's structured decision model, served as a System One endpoint. Send a state along with typed questions, and it returns a choice, a score, or a yes/no...

Context
66K
Input
text · image
Output
decisions
Input: Free per 1M tokensOutput: Free per 1M tokens
View model details →
inception logoinception

Inception: Mercury 2.5

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...

Context
260K
Input
text
Output
text
Input: $0.04Output: $0.15per 1M tokens
View model details →
inception logoinception

Inception: 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...

Context
128K
Input
text
Output
text
Input: $0.25Output: $0.75per 1M tokens
View model details →