comparison
Claude Fable 5 vs Claude Sonnet 4.6
Token pricing, context window and real monthly cost, side by side. Claude Sonnet 4.6 is the cheaper of the two for a typical workload — about 3.3× less.
Positioned by published specs — size, context and modality — not measured performance; a smaller model can sometimes outperform a larger one on your task.
Claude Fable 5 is one class larger (Flagship vs Mid). Lean to the cheaper Claude Sonnet 4.6 unless your task is demanding enough to need the larger class.
| metric | Claude Fable 5 | Claude Sonnet 4.6 |
|---|---|---|
| Input / 1M | $10.00 | $3.00 |
| Output / 1M | $50.00 | $15.00 |
| Context | 1M | 1M |
| Technical class | Flagship | Mid |
| Cost @ typical workload | $8,000/mo | $2,400/mo |
| Modality | text + image | text + image |
| Price source | list | list |
| Provider | Anthropic | Anthropic |
Snapshot . Cost uses a typical workload; tune it in the calculator. How we measure →
Which should you pick?
On a typical workload, Claude Sonnet 4.6 costs $2,400/mo against Claude Fable 5's $8,000/mo — roughly 3.3× cheaper. But the ranking depends on your output-to-input ratio: output is the pricier direction for both, so an output-heavy job (code generation, long answers) widens the gap while an input-heavy one (summarization, retrieval) narrows it. Both share the same context window, so that's not a deciding factor here. By technical class (size and context, not measured capability), Claude Fable 5 is a Flagship and Claude Sonnet 4.6 a Mid — so the lower price partly reflects a smaller class, not just a discount.
These are list and routed market prices, not measured outcomes. Two models at the same rate can still cost different amounts to finish the same task, because verbose or reasoning-heavy models emit more tokens. That gap is exactly what measured cost-per-task captures. The technical-class read above is likewise spec-based — size, context and modality, not measured performance — so a smaller model can still outperform a larger one on your specific task.
Frequently asked questions
Is Claude Fable 5 or Claude Sonnet 4.6 cheaper?
For a typical workload (1,500 input + 500 output tokens × 200,000 requests/month), Claude Sonnet 4.6 costs $2,400/mo versus $8,000/mo for Claude Fable 5 — about 3.3× less. Because output is priced higher than input, the winner can flip if your workload writes much more or less than this; check your own numbers in the calculator.
What's the difference between Claude Fable 5 and Claude Sonnet 4.6 from Anthropic?
Same provider, different tier. On price, Claude Fable 5 is $10.00/$50.00 per 1M (in/out) and Claude Sonnet 4.6 is $3.00/$15.00. By technical class (size & context) it's Flagship (Claude Fable 5) versus Mid (Claude Sonnet 4.6).
Why is Claude Sonnet 4.6 so much cheaper than Claude Fable 5?
Claude Sonnet 4.6 has a much lower per-token rate — $15.00/1M output versus $50.00, and it's a smaller technical class (Mid vs Flagship). The headline rate isn't the whole story, though: a verbose model can cost more to finish a task than its rate implies — that's what measured cost-per-task captures.
More comparisons
- Claude Fable 5 vs GPT-5.5
- GPT-5.5 vs Claude Sonnet 4.6
- Claude Fable 5 vs GPT-5.4
- GPT-5.4 vs Claude Sonnet 4.6
- Claude Sonnet 4.6 vs GPT-5.4 mini
- Claude Fable 5 vs Claude Opus 4.8
Related
- Claude Fable 5 and Claude Sonnet 4.6 — full specs and price history.
- API cost calculator — compare on your own workload.
- All comparisons — the full head-to-head index.