Fusion is an AI model by OpenRouter. Fusion turns your prompt into a small multi-model deliberation.

How much does Fusion cost on Zeplik?

Input tokens cost -1.2e+7 credits per million and output tokens -1.2e+7 credits per million (1 credit = $0.10; the raw provider rates are $-1.0e+6 and $-1.0e+6 per million). New accounts start with free credits.

How long can a conversation with Fusion be?

Fusion has a 1M-token context window (1,000,000 tokens), which covers the conversation plus any documents you attach.

Does Fusion support images and tools?

Fusion is text-only and does not support tool calling.

Fusion

General purpose

OpenRouter · Released June 2026

Fusion turns your prompt into a small multi-model deliberation.

It is an OpenRouter router rather than a model — it dispatches each request to an underlying model, so its cost and capabilities vary with the destination.

Facts and pricing

Provider: OpenRouter
Context window: 1M tokens
Input price: -1.2e+7 credits / 1M tokens ($-1.0e+6 raw)
Output price: -1.2e+7 credits / 1M tokens ($-1.0e+6 raw)
Vision (image input): No
Tool calling: No
Extended reasoning: No

Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin. Raw prices shown per 1M tokens.

What Fusion is best for

Balanced everyday work: writing, questions, brainstorming and summarization
Very long documents and codebases: a 1M-token window fits entire books or repositories in one conversation

Example prompts

Prompts that suit a general purpose model like Fusion:

Help me outline a talk about what I learned this year
Compare these two paragraphs and tell me which is clearer and why
Draft a polite reply declining this invitation
Explain this concept with a concrete everyday analogy

OpenRouter family

Model	Context	Input cr/M	Output cr/M	Released
Auto Router (Beta)	2M	-1.2e+7	-1.2e+7	July 2026
Fusion	1M	-1.2e+7	-1.2e+7	June 2026
Pareto Code Router	2M	-1.2e+7	-1.2e+7	April 2026
Free Models Router	200K	0	0	February 2026
Body Builder (beta)	128K	-1.2e+7	-1.2e+7	December 2025
Auto Router	2M	-1.2e+7	-1.2e+7	November 2023

Model comparisons

Frequently asked questions

What is Fusion?: Fusion is an AI model by OpenRouter. Fusion turns your prompt into a small multi-model deliberation.
How much does Fusion cost on Zeplik?: Input tokens cost -1.2e+7 credits per million and output tokens -1.2e+7 credits per million (1 credit = $0.10; the raw provider rates are $-1.0e+6 and $-1.0e+6 per million). New accounts start with free credits.
How long can a conversation with Fusion be?: Fusion has a 1M-token context window (1,000,000 tokens), which covers the conversation plus any documents you attach.
Does Fusion support images and tools?: Fusion is text-only and does not support tool calling.

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