Claude Fable 5.1 API pricing
Anthropic's most capable widely available line, priced above Opus. Claude Fable 5.1 replaced Fable 5 on 1 September 2026 at the same price and cut the cache-read rate to $0.25 per 1M tokens.
Claude Fable 5.1 prices
What it costs in practice
Claude Fable 5.1 at list prices, no batch discount.
| 1,000 chat replies1,500 tokens in and 300 out each | $30.00 |
|---|---|
| Summarising 100 long reports20,000 tokens in and 800 out each | $24.00 |
| A month of a coding agent400 tasks, 85% of input cached | $1,684 |
The coding-agent example assumes 85% of input is served from cache, typical for agents that resend the same context each step. Model your own workload
Details
claude-fable-5-1- Thinking is always on; depth is set with the effort parameter.
- Claude Mythos 5.1 has the same price but is invitation-only (Project Glasswing).
Checked 27 Sep 2026 against Anthropic pricing and Anthropic announcement .
Other Claude Fable versions
Fable 5 was suspended from 12 June to 1 July 2026 after a US export-control directive, then restored. The invitation-only Claude Mythos 5.1 shares Fable 5.1's price.
| Model | Input / 1M | Output / 1M | Cached input | Context | Released |
|---|---|---|---|---|---|
Claude Fable 5Previous |
$10.00 | $50.00 | $1.00 | 1M | 9 Jun 2026 |
Claude Fable 5 details
Claude Fable 5
Previous$10.00 / $50.00 per 1M tokenscached $1.00 · batch 50% off · 1M context · 128K max output
- Suspended from 12 June to 1 July 2026 after a US export-control directive. It returned with a classifier that routes blocked requests to Opus 4.8.
Newer option: Claude Fable 5.1 at $10.00 / $50.00. Checked 27 Sep 2026 against Anthropic pricing and Anthropic: redeploying Fable 5 .
Compare Claude Fable 5.1
Price history
All changes- Claude Fable 5.1 replaced Fable 5 at the same $10 / $50, with cache reads cut to $0.25. Source
- Claude Fable 5 returned to the API after the US Commerce Department lifted export controls on 30 June. Source
- Anthropic suspended Claude Fable 5 and Mythos 5 for all customers after a US export-control directive. Source
- Anthropic launched Claude Fable 5, a new tier above Opus, at $10 / $50. Source
Anthropic pricing rules
- Batch requests cost 50% less.
- Cache reads are billed at a per-model rate, usually a tenth of the input price or less. Cache writes cost 1.25× input for the 5-minute cache and 2× for the 1-hour cache.
- The full 1M-token context window is billed at standard rates on current models.
Questions
How much does Claude Fable 5.1 cost?
As of 27 Sep 2026, Claude Fable 5.1 costs $10 per million input tokens and $50 per million output tokens, and $0.25 per million cached input tokens. Batch requests cost 50% less. Prices checked 27 Sep 2026.
What is Claude Fable 5.1's context window?
1M tokens, with up to 128K tokens of output.
Does Claude Fable 5.1 support prompt caching?
Yes. Repeated input read from the cache costs $0.25 per million tokens, 98% less than normal input.