Claude Fable 5

Pricing — 1 offering(s)

Showing the active price and any recorded history. Full pricing history is available via the paid API — see API docs.

Capability profile

Operator guidance

Route here when Opus 4.8 is not sufficient — the new ceiling for publicly available Claude capability. Adaptive thinking is always on, so there is no effort parameter to tune. Drop to Opus 4.8 ($5/$25) for most agentic workloads where cost matters; Sonnet 5 ($2–3/$10–15) for standard production use.

Use cases

• The most demanding reasoning and long-horizon agentic coding tasks
• Complex multi-step agent workflows where quality dominates cost and latency
• Top-end benchmark and evaluation work

Limitations

• Highest cost and latency of any publicly available Claude model ($10/$50 per MTok)
• Updated tokenizer produces ~30% more tokens than Sonnet 4.6 and earlier — factor into cost comparisons
• Vendor-reported benchmark scores exist (SWE-bench Pro 69.2%, Terminal-Bench 2.1 82.7%, OSWorld-Verified 83.4%, HLE-with-tools 57.9% — source: Anthropic Sonnet 5 launch comparison graphic, 2026-07) but are not yet seeded to modelglass-coding, pending SCO-142 benchmark feasibility investigation
• Adaptive thinking always on — cannot be disabled; may increase output length and cost vs. non-thinking models

Citations

• Claude models overview (Anthropic docs)
• Claude pricing (Anthropic docs)
• Claude Sonnet 5 launch announcement — benchmark comparison graphic