Input
- Official Anthropic
- $10
- Here (−50%)
- $5
claude-fable-5-1
Claude Fable 5.1 API — price per token
Claude Fable 5.1 is Anthropic's current Mythos-class model — a tier above Opus for the longest-horizon agentic work, at double the Opus token price, with cache reads at $0.25 per 1M.
Pricing per 1M tokens
| Rate | Official Anthropic | Here (−50%) |
|---|---|---|
| Input | $10 | $5 |
| Output | $50 | $25 |
| Cache read | $0.25 | $0.125 |
| Cache write (5m) | $12.5 | $6.25 |
Output
- Official Anthropic
- $50
- Here (−50%)
- $25
Cache read
- Official Anthropic
- $0.25
- Here (−50%)
- $0.125
Cache write (5m)
- Official Anthropic
- $12.5
- Here (−50%)
- $6.25
Every request is metered at the official rate first, then the flat 50% B2C discount is subtracted before it touches your prepaid balance. Context window: 1M tokens. Max output: 128K tokens.
Best for
- The longest-horizon autonomous runs where failure costs more than tokens.
- The hardest software tasks — the current Mythos GA.
- Cache-heavy agent loops that re-read a large prefix every turn.
Good to know
- Same $10/$50 tariff as Fable 5; cache reads are $0.25 per 1M (0.025× input) instead of Fable 5's $1.
- Adaptive thinking is always on; thinking tokens bill as output. Forced tool_choice any/tool is a 400.
- Safety classifiers may reroute sensitive requests to Opus. Mythos 5.1 stays Glasswing-only.
How to use Claude Fable 5.1
Create a free account, generate one key, and point any Anthropic-compatible tool at https://router.apitoken.sale with model ID claude-fable-5-1. Eligible new accounts include $5 of platform bonus credit — enough to test the model before topping up. Existing integrations on the legacy host https://api.apitoken.sale keep working.
Frequently asked questions
How much does the Claude Fable 5.1 API cost?
Officially $10 per 1M input tokens and $50 per 1M output tokens — the same as Fable 5. Cache reads are $0.25 per 1M (0.025× input). On apiToken.sale the flat 50% discount applies to every call: $5/$25, cache reads $0.125.
What is the model ID for Claude Fable 5.1?
claude-fable-5-1. Use it unchanged with the Anthropic SDK, Claude Code, Cursor or any compatible tool pointed at https://router.apitoken.sale.
Fable 5.1 or Fable 5?
Same input/output price. Fable 5.1 is the current GA, always-on adaptive thinking, and four times cheaper cache reads. New work should send claude-fable-5-1. Keep Fable 5 only when a toolchain is pinned to it.
Run Claude Fable 5.1 on the same Anthropic API at a flat 50% off — instant key, prepaid balance, card or crypto.