Creator's Top 3 Closed Models: Fable 5, GPT 5.6 Sol, Grok 4.6

Melvin Vivas · X post · 2026-08-29 · Open on X

Topics: LLM Fundamentals, Industry Trends & Job Market · Level: beginner

Summary

Melvin Vivas ranks his top three closed models from his own experience. It's a personal opinion that gives a few model names to try when choosing a model.

Key points

• #1 Fable 5
• #2 GPT 5.6 Sol
• #3 Grok 4.6
• This ranking is based on his personal experience, not on benchmarks.

Resources mentioned

• Fable 5 · tool · anthropic.com · paid
  A frontier model used as the comparison point in the Claude Opus 5 announcement; the post gives no other details about it.
  Also in: Claude Opus 5.5 in Devin: #1 on FrontierCode 1.1 (Melvin Vivas on X · notes), Opus 5 vs Fable 5: Cost per Task in Cursor Benchmarks (Melvin Vivas on X · notes), Opus 5 Beats Fable 5 on Cost per Task and Tokens (Melvin Vivas on X · notes), Claude Opus 5 Release: Anthropic's New Model Announced (Melvin Vivas on X · notes) and 7 more
• GPT 5.6 Sol · tool · openai.com · paid
  A GPT-family model available through an API, whose API and credit pricing was cut by over 20% for three months.
  Also in: Coworker v0.3.1: Telegram Streaming Sync, Built Fast with Codex (Melvin Vivas on X · notes), Coworker: Open-Source Grok Bot Clone Built on Pi and CopilotKit (Melvin Vivas on X · notes), GPT 5.6 Sol (medium) in ChatGPT for planning tasks (Melvin Vivas on X · notes), GPT-5.6 Sol Price Cuts on Vercel AI Gateway (70% Off Input) (Melvin Vivas on X · notes) and 12 more
• Grok 4.6 · tool · x.ai · paid
  xAI's latest frontier LLM, announced as an improvement over Grok 4.5 at the same price.
  Also in: Hermes (Grok 4.6) vs ChatGPT Work on a text-to-PDF task (Melvin Vivas on X · notes), Plan with a Strong Model, Execute with a Cheaper One (Melvin Vivas on X · notes), Grok 4.6 release: better than Grok 4.5 at the same price (Melvin Vivas on X · notes)