Anthropic · Flagship
Claude Fable 5.1 API pricing and specs
Anthropic's top tier above Opus, with always-on adaptive thinking, per-message effort and progress updates between tool calls.
$10
$0.25
$50
Cache reads cost $0.25 per million and 5-minute cache writes $12.50. Fable requires 30-day data retention, so it is not available under zero data retention without approval, and its output text carries a watermark.
Spec sheet
- API model string
claude-fable-5-1- Provider
- Anthropic
- Context
- 1M tokens
- Max output
- 128K tokens
- Released
- September 1, 2026
- Batch API
- 50% off, results within hours
- Documented agent features
- Tool callingStructured outputComputer useAdjustable reasoning
What a task costs
Four reference workloads priced at this model's list rates, with caching applied after the first call. Your numbers will differ; the calculator lets you change every assumption.
| Workload | Per task | Per 1,000 tasks |
|---|---|---|
| Support bot | $0.266 | $266 |
| Coding agent | $7.76 | $7,761 |
| Browser agent | $6.36 | $6,357 |
| Research agent | $6.25 | $6,248 |
Other Anthropic models
Similar cost elsewhere
Models from other providers whose cost on the 30-step coding workload is closest to this one.