The Claude family in June 2026 spans more variants than at any point since Anthropic's founding. The original Opus, Sonnet, Haiku scale-tier segmentation now coexists with sibling lines (Mythos for cybersecurity, Fable for narrative) that are segmented by use-case archetype rather than just scale. This page maps the full lineage as of June 10, 2026 and covers what the sibling-line segmentation means for brand-visibility behavior across the family.
The full Claude lineup (June 2026)
| Variant | Tier | Status | Primary use case |
|---|---|---|---|
| Claude Opus 4.7 | Frontier flagship | GA | Complex reasoning, agentic workloads |
| Claude Sonnet 4.6 | Mid-tier workhorse | GA | Production default, balanced cost-capability |
| Claude Haiku 4.5 | Fast and cheap | GA | High-volume, low-latency tasks |
| Claude Mythos (preview) | Sibling line | Preview (Apr 2026) | Cybersecurity preview cohort |
| Claude Mythos 5 | Sibling line, frontier | GA (Jun 2026) | Cybersecurity, vendor risk, compliance |
| Claude Fable 5 | Sibling line | Partner preview (Jun 2026) | Long-form creative writing, narrative |
What sibling-line segmentation means for brand visibility
Until April 2026, all Claude queries hit the same Opus, Sonnet, or Haiku trio segmented by scale only. Brand visibility behavior was consistent across the family because the underlying tuning was shared. Starting with Mythos preview (April 2026) and continuing with Mythos 5 GA and Fable 5 preview (June 2026), Anthropic has segmented the family by use-case archetype, which means brand-visibility behavior will start to vary by Claude variant.
For brand teams this changes the measurement problem. A single Claude baseline no longer represents the full brand-visibility surface. Brands with cybersecurity-sensitive buyers face Mythos 5 evaluation patterns that differ from Opus 4.7. Brands publishing creative or narrative content face Fable 5 handling patterns that differ from Sonnet 4.6. Multi-variant baselining becomes the new standard.
Cross-variant tuning propagation
Anthropic's typical release pattern moves sibling-line tuning improvements back into the general-purpose Opus and Sonnet lines over subsequent releases. The Mythos preview cybersecurity tuning likely influences Opus 4.7 cybersecurity behavior even though Opus 4.7 is not the Mythos variant. Similarly, Fable 5 creative-content tuning will likely propagate back into general-purpose Opus and Sonnet over the next several releases.
This propagation means brand-visibility consequences from sibling-line releases extend beyond the specific sibling variant. Brands that under-perform on Mythos 5 may see degraded performance on later Opus releases as the cybersecurity tuning propagates back.
The Anthropic positioning logic
Sibling-line segmentation by use-case archetype is a competitive response to OpenAI's broader product surface and Google's deep ecosystem integration. Anthropic does not own a comparable consumer-product distribution channel (no equivalent to ChatGPT consumer share or Gemini's Google Workspace integration), so the lab is competing on capability differentiation at the model layer. Cybersecurity (Mythos) and creative writing (Fable) are the first two sibling lines; financial reasoning, scientific research, and code-specific sibling lines are plausible future moves.