magnum-v4-72b
Magnum v4 72B is a fine-tune of Qwen2.5 72B from Anthracite, part of a series aimed at reproducing the prose quality of Claude 3 Sonnet and Opus.
Pricing: Input 600 credits / 1M tokens (≈ $3.00), Output 1200 credits / 1M tokens (≈ $6.00).
Prices updated
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Magnum v4 72B API on ModelFold
Magnum v4 72B is a fine-tune of Qwen2.5 72B from Anthracite, part of a series aimed at reproducing the prose quality of Claude 3 Sonnet and Opus. Try Magnum v4 72B in the ModelFold Playground, then call it from your own code through an OpenAI-compatible chat completions API.
What Is the Magnum v4 72B API
Magnum v4 72B at a glance
Magnum v4 72B is a chat model from Anthracite. It accepts text as input and returns text, with a context window of up to 33K tokens.
Use it without hosting anything
On ModelFold you call Magnum v4 72B with a single API key — no model weights to download and no inference servers to run. The same key also works for the other chat, image, video and audio models on ModelFold.
Core Capabilities of Magnum v4 72B
Up to 33K tokens of context
Keep long conversations, large documents and sizeable code in a single request, so the model can reason over the full material instead of fragments.
Structured outputs
Ask for JSON that follows a schema (response_format), which makes extraction, classification and system integrations more reliable.
How to Use Magnum v4 72B on ModelFold
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Step 1: Try it in the Playground
Open the Playground at the top of this page, type a prompt and see how Magnum v4 72B responds before writing any code.
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Step 2: Create an API key
Sign in to ModelFold and create an API key in the console. Keep it secret and send it as a Bearer token.
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Step 3: Send a request
Call POST https://modelfold.ai/v1/chat/completions with "model": "magnum-v4-72b" and your messages. Existing OpenAI-compatible SDKs work by changing the base URL and key.
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Step 4: Ship and monitor
Integrate the response into your product and check token usage and spend for every call in the console logs.
What You Can Build with Magnum v4 72B
Writing and content
Draft, edit and translate articles, emails, product copy and documentation in a consistent tone.
Frequently Asked Questions
What is Magnum v4 72B?⌄
Magnum v4 72B is a fine-tune of Qwen2.5 72B from Anthracite, part of a series aimed at reproducing the prose quality of Claude 3 Sonnet and Opus.
Which inputs does Magnum v4 72B support?⌄
Magnum v4 72B accepts text and returns text. Through ModelFold you send text messages; documents attached in the Playground are converted to text.
How long is the context window of Magnum v4 72B?⌄
Up to 33K tokens, shared between your input and the model’s output.
Does Magnum v4 72B support function calling?⌄
Function calling is not listed for Magnum v4 72B; requests that include tools will be rejected. Use plain prompts or JSON output instead.
How is Magnum v4 72B billed on ModelFold?⌄
Pay as you go by tokens: input and output tokens are charged at the per-million-token prices shown on this page. There is no monthly fee, and failed requests are not charged.
How do I call Magnum v4 72B through the API?⌄
Send a POST request to https://modelfold.ai/v1/chat/completions with "model": "magnum-v4-72b", using your ModelFold API key as the Bearer token.
| Input | 600 credits 1M tokens≈ $3.00 |
| Output | 1200 credits 1M tokens≈ $6.00 |
Billed per token: input and output are priced separately, and thinking tokens count as output. The Playground charges exactly the same way.
Read API docs →AI Agents · Claude Code / Cursor / Trae →curl https://modelfold.ai/v1/chat/completions \
-H "Authorization: Bearer $MODELFOLD_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"magnum-v4-72b","messages":[{"role":"user","content":"Hello"}]}'