benchrAnthropic
Claude Fable 5
Anthropic · frontier. The hardest long-horizon agentic coding.
The published record
Every number below was read from the provider's own documentation on the date shown. benchr does not restate a figure it has not seen published.
- API identifier
claude-fable-5- Context window
- 1MtokensSource
- Maximum output
- 128KtokensSource
- Input
- $10.00per 1M tokensSource
- Output
- $50.00per 1M tokensSource
- Cached input
- $1.00per 1M tokensSource
- Released
- June 9, 2026Source
- License
- Proprietary
Availability Active. Anthropic's current lifecycle table says Claude Fable 5 will not retire before June 9, 2027.
Record verified September 2, 2026
What the record says
Generally available from June 9, 2026. Anthropic describes Fable 5 and Mythos 5 as two configurations of the same underlying model: Fable is the general-use configuration with added safeguards in high-risk biology and cybersecurity domains, while Mythos is restricted to approved Project Glasswing partners. A U.S. export-control directive on June 12 required Anthropic to block access by foreign nationals; because nationality could not be verified per request, Anthropic suspended both models globally. The controls were lifted June 30 and Fable returned globally July 1. Fable requires 30-day data retention for safety monitoring. Combined Fable/Mythos benchmark graphics are not treated as Fable-only scores. Rechecked September 2, 2026: Fable 5 remains Active; Fable 5.1 is an additional API model rather than a retirement notice for this version.
What benchr has documented it doing
Capabilities in the benchr ledger that name this model. Documented means a provider says it works and benchr recorded where. Verified means benchr ran it.
3 capabilities name this model. All 3 are officially supported by the provider; benchr has run 0 of them itself.
What has moved
Entries in the change ledger that affect this model, newest first.
Released
Released June 9, 2026. Mythos-class and generally available; safety-classified cyber/bio/distillation requests return an explicit refusal, and another-model retry requires configured application logic. Suspended June 12 and restored globally July 1, 2026. Source: anthropic.com/news/claude-fable-5-mythos-5
Which one to use
The rest of the family, with the two numbers that usually decide it. The current model is marked.
| Models | Input | Output | Context window |
|---|---|---|---|
| Claude Haiku 4.5 | $1.00 | $5.00 | 200K |
| Claude Sonnet 5 | $2.00 | $10.00 | 1M |
| Claude Sonnet 4.6 | $3.00 | $15.00 | 1M |
| Claude Opus 4.7 | $5.00 | $25.00 | 1M |
| Claude Opus 4.8 | $5.00 | $25.00 | 1M |
| Claude Opus 5 | $5.00 | $25.00 | 1M |
| Claude Fable 5 This page | $10.00 | $50.00 | 1M |
| Claude Fable 5.1 | $10.00 | $50.00 | 1M |
benchr's read
Worth it for
- The hardest long-horizon agentic coding
- Large-codebase migrations
- Frontier research and finance work
- Vision-driven agent loops
Look elsewhere if
- Price matters — Opus 4.8 is half the cost
- Offensive-security or bio work — classifiers return an explicit refusal; another-model retry requires configured application logic
- Routine chat and drafting
Prices, limits, and identifiers above are provider facts. This section is benchr's judgement about them.
What benchr has written about it
Pieces that name this model, newest first. The ones written about this model come before the ones that mention it in passing.
What is not on this page
Stated rather than filled in.
- No first-token or tokens-per-second figure is recorded. benchr has not measured it and the provider does not publish one.
- benchr has not run any capability on this model itself. Everything in the capability section is documentation, not a test result.