Mercury 2.5
Mercury 2.5 is the fastest reasoning LLM, and the latest diffusion LLM (dLLM) from Inception.
Model by Inception
Install
Pick your client. Read the repository before you give any tool access to your data.
{
"model": "inception/mercury-2.5",
"baseURL": "https://openrouter.ai/api/v1"
}OpenAI-compatible API: point any OpenAI SDK at the base URL and use this model id.
Settings it needs
OPENROUTER_API_KEYrequiredsecret
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About
Use cases: model-inference
Reviews
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Price and limits
| Variant | Input $/M tokens | Output $/M tokens | Cached input $/M |
|---|---|---|---|
| Standard | $0.04 | $0.15 | $0.004 |
Price as of Oct 26, 2026 from OpenRouter. Prices change often; check before you rely on one.
- Provider
- Inception
- Model id
inception/mercury-2.5- Context window
- 260,000 tokens (260K)
- Max output
- 65,536 tokens
- Input
- text
- Output
- text
- Tool calling
- Yes
- Structured outputs
- Yes
- Reasoning
- Yes
- Weights
- Closed
- Released
- Sep 8, 2026
Details
- Auth
- API key
- License
- Proprietary
- Website
- www.inceptionlabs.ai
- First seen
- Oct 24, 2026
- Last checked
- Oct 26, 2026
- Source
- OpenRouter
More from Inception
- 0.592score
Mercury 2
Inception
Mercury 2 is an extremely fast reasoning LLM, and the first reasoning diffusion LLM (dLLM).
ModelAFreshness: A$0.25 / $0.75128K ctx - 0.592score
Mercury 3
Inception
Mercury 3 is a diffusion-based language model from Inception, and the lab's most capable model to date.
ModelAFreshness: A$0.1 / $0.351M ctx
Cite this page
Mercury 2.5: price, context window, tool use. Agent Mart. https://agentmart.dev/models/inception-mercury-2-5 (last updated 2026-10-26)