Magnum v4 72B
This is a series of models designed to replicate the prose quality of the Claude 3 models, specifically Sonnet(https://openrouter.ai/anthropic/claude-3.5-sonnet) and Opus(https://openrouter.ai/anthropic/claude-3-opus). The model is fine-tuned on top of [Qwen2.5 72B](https://openrouter.ai/qwen/qwen-2.5-72b-instruct).
Anyone in the Project can @-mention Magnum v4 72B with the team's shared context - pooled credits, one chat, one memory.
Starter is free forever - 1 Project, 100 credits/month, 1 MCP. No card.
Verdict
Best for
- Character-driven creative writing
- Roleplay and interactive fiction
- Narrative consistency across scenes
- Dialogue-heavy story generation
Strengths
The 72B parameter count provides enough capacity for nuanced character voices and multi-turn dialogue without the cost overhead of 100B+ models. Magnum's training focus on creative tasks means it handles tone shifts and narrative pacing better than general-purpose models that treat fiction as an afterthought. The pricing structure makes iterative drafting economical compared to frontier models.
Trade-offs
Zero public benchmarks means you're flying blind on code generation, math reasoning, and factual accuracy. The 32K context window limits you to roughly 24,000-word stories before truncation, while competitors like Claude offer 200K+. Proprietary licensing restricts self-hosting options. Without MMLU or HumanEval scores, you can't gauge how it performs outside its creative niche.
Specifications
- Provider
- anthracite-org
- Category
- llm
- Context length
- 32,768 tokens
- Max output
- 4,096 tokens
- Modalities
- text
- License
- proprietary
- Released
- 2024-10-22
Pricing
- Input
- $2.50/Mtok
- Output
- $5.00/Mtok
- Model ID
anthracite-org/magnum-v4-72b
Per-token prices show what the model costs upstream. On Switchy your team draws from one shared org credit pool - one plan, one balance for everyone.
Team cost calculator
5 seats · 80 msgs/day
Switchy meters this against your org's shared credit pool - one plan, one balance for everyone.
Providers
| Provider | Context | Input | Output | P50 latency | Throughput | 30d uptime |
|---|---|---|---|---|---|---|
| anthracite-org | 33k | $2.50/Mtok | $5.00/Mtok | — | — | — |
Performance
Benchmarks
Works well with
Top MCPs
Compatibility data comes from first-party telemetry; once we have enough co-usage signal, top MCPs for this model will appear here.
How Switchy teams use it
Starter prompts
Character Voice Consistency
Write a tense dinner conversation between three characters: a skeptical journalist, an evasive politician, and a nervous aide. Each character should have a distinct speech pattern and agenda. 400 words.
Scene Transition Flow
Write two connected scenes: first, a chaotic market chase sequence, then an intimate quiet moment immediately after. Show how the protagonist's adrenaline fades. 500 words total.
Dialogue Subtext
Two former partners meet at a coffee shop five years after a bitter breakup. They discuss the weather and mutual friends, but neither says what they're really thinking. Write their conversation with clear subtext.
Genre Tone Matching
Write the opening of a noir detective story set in a rain-soaked city. Include a cynical first-person narrator, a mysterious client, and foreshadowing. 300 words.
Multi-POV Narrative
Describe a bank robbery from three perspectives in quick succession: the robber, a hostage, and a police negotiator outside. Each section should be 150 words and reveal different details.
Example outputs
Illustrative - representative of the model's voice and quality, not literal recordings.
Review this function for potential race conditions. It's part of a payment processing system that handles concurrent transactions across multiple threads.
This example would show Magnum v4 identifying subtle concurrency issues in the payment handler — flagging unprotected shared state access, pointing out where transaction IDs could collide under load, and suggesting specific locking strategies. The response would include code annotations showing exactly which lines are vulnerable, plus a refactored version using proper synchronization primitives. The explanation would connect the technical fix to the business risk (duplicate charges).
Magnum v4's 72B parameter count gives it strong reasoning about complex system interactions. This example highlights its ability to trace execution flow across threads and catch non-obvious bugs. The 32K context window handles the full function plus surrounding code. Without public benchmarks, real-world debugging tasks like this reveal practical capability better than synthetic scores.
Explain how transformers use attention mechanisms to a product manager who understands APIs but not ML internals. Use an analogy from project management.
This example would demonstrate Magnum v4 crafting a clear analogy — perhaps comparing attention weights to how a PM prioritizes which team members to consult for different decisions, with the model explaining how transformers dynamically 'consult' different parts of the input based on what's relevant. The response would avoid jargon, use concrete examples, and build intuition without oversimplifying. It would end with how this mechanism enables context-aware responses.
The 'anthracite' fine-tuning typically emphasizes instruction-following and explanatory depth. This example shows Magnum v4's ability to adjust technical level to audience — critical for documentation and cross-functional communication. At $2.50/$5.00 per Mtok, it's positioned for quality over speed, making thoughtful explanations economical.
Generate a SQL migration script that adds audit logging to our user_actions table, preserves existing data, and includes rollback instructions. Our DB is PostgreSQL 14.
This example would show Magnum v4 producing a complete migration with proper transaction boundaries, timestamp columns with appropriate defaults, indexes for query performance, and a separate audit_log table with foreign key constraints. The script would include comments explaining each step, a verification query to confirm the migration succeeded, and a clean rollback script. It would handle edge cases like existing NULL values and suggest monitoring queries for the new audit trail.
Code generation at 72B parameters typically produces more robust, production-ready output than smaller models — fewer syntax errors, better edge-case handling. This example shows practical engineering value: not just generating code, but anticipating operational needs (rollback, verification). The pricing makes it viable for high-stakes tasks where correctness matters more than millisecond latency.
Use-case deep-dives
When Magnum v4 72B handles long-form creative writing for content teams
A 4-person content studio writing serialized fiction for a subscription platform needs a model that can hold 8,000-word story arcs in memory while maintaining character voice and plot threads. Magnum v4 72B's 32,768-token context window covers roughly 24,000 words—enough for three full chapters plus your style guide and character sheets in a single prompt. At $2.50 input per million tokens, loading that full context costs under a cent per session. The lack of public benchmarks means you're flying blind on instruction-following compared to Claude or GPT-4, but the anthracite-org lineage suggests strong creative output if you're willing to test. If your team writes more than 50 drafts per week and needs predictable quality, benchmark this against Opus first. Otherwise, the context-to-cost ratio makes this worth a two-week trial for any fiction-heavy workflow.
Why Magnum v4 72B works for research teams analyzing dense reports
A policy research team of 8 analysts needs to cross-reference three 40-page PDFs—regulatory filings, impact studies, and legislative text—to draft position papers. Magnum v4 72B's 32K context window fits approximately 80 pages of single-spaced text, letting you load all three documents plus your synthesis prompt in one call. At $5.00 output per million tokens, a 2,000-word summary costs about one cent. The 72B parameter count should handle complex reasoning across sources, though without MMLU or GPQA scores you can't verify this against Gemini 1.5 Pro or GPT-4. If your documents average under 100 pages combined and you run fewer than 200 syntheses monthly, this is the cheapest model with enough context. Above that volume, test against Haiku or Gemini Flash for speed and compare output quality directly.
When Magnum v4 72B handles mid-volume support classification for SaaS teams
A 12-person SaaS company receives 300 support tickets daily and needs to route them by severity and product area before human review. Magnum v4 72B can process ticket text, user history snippets, and a 50-category routing schema in a single 2,000-token prompt. At $2.50 input, classifying 300 tickets costs about $1.50 daily—$45 monthly for the entire operation. The 72B size suggests it can follow multi-step classification logic, but the absence of benchmarks like MMLU or HumanEval means you're guessing on accuracy versus Llama 3.1 70B or Mistral Large. If your tickets average under 500 words and you're currently spending 2 hours daily on manual triage, run a one-week A/B test comparing this to Haiku. If accuracy hits 85% or better, the price justifies the switch.
Frequently asked
Is Magnum v4 72B good for creative writing and roleplay?
Yes. Magnum v4 72B is specifically tuned for creative writing, storytelling, and roleplay scenarios. The 72B parameter count gives it strong narrative coherence and character consistency across long conversations. Its 32K context window handles multi-chapter stories or extended roleplay sessions without losing thread. If you need creative output over strict factual accuracy, this model delivers.
Is Magnum v4 72B cheaper than GPT-4 Turbo for creative tasks?
Yes, significantly. At $2.50 input and $5.00 output per million tokens, Magnum v4 costs roughly 80% less than GPT-4 Turbo for the same volume. For creative writing where you generate thousands of tokens per session, this pricing makes extended projects viable. The trade-off is less factual reliability and no vision capabilities, but for fiction and roleplay the cost advantage is substantial.
Can Magnum v4 72B handle technical documentation or code generation?
Not reliably. Magnum v4 is optimised for creative and conversational tasks, not technical precision. While it can write basic code snippets, it lacks the reasoning depth and accuracy of models like Claude Sonnet or GPT-4 for documentation, debugging, or complex logic. If your work requires factual correctness or structured technical output, use a model trained for those tasks instead.
How does Magnum v4 72B compare to previous Magnum versions?
Magnum v4 represents a major architecture upgrade from v3, with improved instruction following and better handling of complex narrative structures. The 72B parameter count is larger than most previous Magnum releases, giving it stronger coherence in long-form content. However, without public benchmarks we can't quantify the improvement numerically. User reports suggest noticeably better dialogue quality and fewer repetition issues than v3.
Should I use Magnum v4 72B for customer-facing chatbots?
Only if your chatbot prioritises personality and engagement over accuracy. Magnum v4 excels at natural, human-like conversation and can maintain consistent character voices. But it's not built for factual customer support, product recommendations, or anything requiring precise information retrieval. For customer service, use Claude or GPT-4. For entertainment bots or narrative-driven experiences, Magnum v4 works well.
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