Fable 5 is the first publicly available Mythos-class Claude model. For founders, agency owners, SDR managers, and solopreneurs doing LinkedIn outreach, it is the first AI model that can run your entire LinkedIn system without you re-explaining your ICP, your voice, or your standards every session.
What Fable 5 actually is
Plain terms
Four model tiers exist: Haiku (fast, cheap), Sonnet (everyday), Opus (was the best until now), Fable 5 (new top tier). Fable 5 is the first Mythos-class model available to the public. Same underlying model as Mythos 5, with cybersecurity safeguards active.
For LinkedIn outreach: Fable 5 is the first model that can hold full context about your ICP, your voice, your best-performing hooks, and your outreach standards across a long session without losing any of it. The longer and more complex the task, the larger the gap over Opus 4.8.
Why it matters specifically for LinkedIn
LinkedIn outreach is context-heavy. Every message needs to reference something specific. Every post needs to sound like you. Every DM needs to match the relationship level.
With Opus 4.8 you had to re-explain your voice, your ICP, and your standards constantly. Fable 5 with a properly configured CLAUDE.md and skill stack holds all of that automatically. You give it the brief. It gives you the output. No re-briefing.
Pricing and access
What you need
Claude Pro ($20/month): access to Fable 5 but session limits will be tight for heavy use.
Claude Max ($100 or $200/month): recommended for anyone running a serious LinkedIn outreach system. Session limits are the main constraint.
Fable 5 uses roughly 2x the session limits of Opus 4.8. On high effort (the right default), it is fast and capable. Do not use max effort for LinkedIn tasks. High effort is sufficient for everything in this playbook.
After June 22
Fable 5 switches to usage credits after June 22. Anthropic has stated the intention to bring it back to subscriptions when capacity allows. For now, use it while it is included in your plan and set up your system before the switch.
The one setup change that makes everything else work
The CLAUDE.md for LinkedIn outreach
Copy this into your project root CLAUDE.md and fill in the brackets:
# LinkedIn Outreach System
## Who I am
Name: [YOUR NAME]
Role: [Founder / Agency Owner / SDR Manager / Solopreneur]
Company: [COMPANY NAME and one-line description]
What I sell: [YOUR OFFER in one sentence]
## My ICP
Target role: [titles you target]
Target company: [company type and size]
The one qualification question: is this person responsible for [function]? If yes, pursue. If no, skip.
Disqualify immediately:
- Open to work / job seekers
- No decision-making authority
- Students with no real company
## My voice rules
- Write like a sharp, direct human. Not like a corporate email.
- No em dashes
- No banned words: leverage, synergy, bandwidth, honestly, straightforward
- No hedging: "it may be worth", "you might consider"
- Short sentences. One idea per line.
- Sound like me, not like a template
## LinkedIn outreach rules
- Connection requests: under 200 characters, no pitch, reference something specific
- First DM: under 150 characters, add value or start a conversation, no pitch
- Second DM: new angle, share something specific, still no pitch
- Never send a third DM without a reply
- Posts: hook must be a specific statement, not a question, no hashtag spam
## Hard rules
- Never send a message without my explicit confirmation
- Never pitch before we have established a conversation
- If the prospect has not replied to 2 DMs, stop and flag
## Skills
- ICP Skill: .claude/skills/icp/SKILL.md — load before any outreach or content task
- LinkedIn Content Writer: .claude/skills/linkedin-content/SKILL.md — load for posts
- LinkedIn Creator: .claude/skills/linkedin-creator/ — load for full content strategy
- Social Selling: .claude/skills/social-selling/ — load for DM sequences and engagement
- Hook Writer: .claude/skills/hook-writer/ — load for opening lines and post hooks
- Output Reviewer: .claude/skills/output-reviewer/SKILL.md — load before anything ships