Vivgrid: Viv Fast
Viv Fast is a reasoning model from Vivgrid released on Sep 21, 2026. It reads text and images and writes text, with a 1M token context window and up to 256K tokens per reply.
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It costs $0.13 per million input tokens and $0.40 per million output tokens. Cached input bills at $0.05, 62% less than fresh input.
It supports tool calling, structured JSON output and prompt caching.
- Modalities
- In / out price
- $0.13 / $0.40 per 1M
- Context
- 1M
- Max output
- 256K
- Released
- Sep 21, 2026
- Knowledge cutoff
- Sep 2026
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Viv Fast pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $0.13 / 1M tokens | |
|---|---|---|
| Output | $0.40 / 1M tokens | |
| Cached input (read) | $0.05 / 1M tokens | 62% off input |
What Viv Fast costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call Viv Fast through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Reasoning
reasoning
Alternatives to Viv Fast
Models that take the same inputs and call tools, closest in price, cheaper ones first.
- 262K context
Reads text and images. Tool calling, structured output, reasoning. Served by 28 providers.
by googleApr 1, 2026$0.13/M input tokens$0.40/M output tokens28 providers
- Index 37.9
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by googleJun 17, 2025$0.10/M input tokens$0.40/M output tokens23 providers
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by thedrummerSep 6, 2026$0.10/M input tokens$0.45/M output tokens
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by prism-mlSep 18, 2026$0.075/M input tokens$0.50/M output tokens2 providers
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Reads text and images. Tool calling, structured output, reasoning. Served by 2 providers.
by bytedanceApr 28, 2026$0.10/M input tokens$0.40/M output tokens2 providers
More from Vivgrid
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by vivgridMar 3, 2026$0.25/M input tokens$1.50/M output tokens
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by vivgridFeb 24, 2026$1.75/M input tokens$14/M output tokens
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by vivgridFeb 19, 2026$2/M input tokens$12/M output tokens
Viv Fast questions
How much does the Viv Fast API cost?
$0.13 per million input tokens and $0.40 per million output tokens, with cached input at $0.05. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of Viv Fast?
1,000,000 tokens of input, and it can write up to 256,000 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Does Viv Fast support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is Viv Fast open source?
No. Vivgrid serves it through an API only, so you cannot download the weights or host it yourself.
When was Viv Fast released?
Sep 21, 2026, with training data up to Sep 2026.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.
Building on Viv Fast?
I test your real tasks on it and the two closest alternatives, then ship the agent on whichever wins on cost and accuracy.
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