viv-fast — API, Pricing & Context Window | Vivgrid
viv-fast is Vivgrid's own fast, low-cost multimodal model: text and image input, a 1M-token context window, up to 256K output tokens, and both Chat Completions and Responses API support.
viv-fast is Vivgrid's SLM for fast, high-volume workloads. It accepts text, image input, keeps a 1M-token context window and 256K-token max output, supports function calling, and is priced at $0.13 per 1M input tokens, $0.05 cached, and $0.40 output.
It is available on both OpenAI surfaces — Chat Completions (/chat/completions) and the Responses API (/responses) — so coding CLIs that expect the Responses wire format, such as Codex and Pi, work against the same key.
Specifications
| Provider | Vivgrid |
| Model ID | viv-fast |
| Best for | General-purpose |
| Context window | 1,000,000 tokens |
| Max output | 256,000 tokens |
| Modalities | Text, Image |
| Tool / function calling | Yes |
| Knowledge cutoff | 2026-09 |
| Acceleration | ⚡ Geo-Distributed — AMER, EMEA, APAC |
Pricing
Pricing in USD per 1M tokens, matching the provider's rates.
| Input | Cached input | Output |
|---|---|---|
| $0.13 | $0.05 | $0.40 |
Quick start
Call viv-fast through Vivgrid's unified, OpenAI-compatible endpoint. Get an API key from the Vivgrid Console.
curl https://api.vivgrid.com/v1/chat/completions \
-H "Authorization: Bearer $VIVGRID_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "viv-fast",
"messages": [
{ "role": "user", "content": "Say hello in English, Chinese and Spanish." }
],
"stream": true
}'Ideal use cases
- High-volume agent loops — cheap input and cached-input pricing keeps long, tool-heavy sessions affordable.
- Multimodal understanding — reason over screenshots, recordings, and audio clips in the same request as text.
- Long-context work — feed large codebases, transcripts, or document sets into the 1M-token window.
- Coding CLIs on the Responses API — drop-in for tools such as Codex and Pi.
Related models
- gpt-6-astra — frontier model from OpenAI
- claude-fable-5.1 — frontier model from Anthropic
- gemini-3.8-flash — fast multimodal model from Google
- deepseek-v4.1-flash — open-sourced fast, low-cost coding model