Claude Fable 5
claude-fable-5
Anthropic · reasoning · api · seen 11m ago
Unavailable
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Not currently available.
This model is listed by Anthropic but a live request is rejected, so it isn't usable right now — the provider suggests Opus 4.8.
We re-check every few minutes and will alert subscribers the moment it goes live.
Context
1M
Max output
128K
Input $/1M
$10.00
Output $/1M
$50.00
Modalities
text · image · document
Released
07 Jun 2026
AI summary
● machine-written
Claude Fable 5: Anthropic's most capable widely released model
Claude Fable 5 is Anthropic's most capable widely released model, built for demanding reasoning and long-horizon agentic work. It supports text, image, and document inputs with a 1M token context window and up to 128k output tokens per request. The model is generally available on the Claude API, AWS, Bedrock, Vertex AI, and Microsoft Foundry as of June 9, 2026.
What's new
- Includes safety classifiers that can decline certain requests with stop_reason: 'refusal'
- Adaptive thinking is always on by default
- Fallback support for retrying declined requests on other Claude models
- 30-day data retention designated as a Covered Model
Best for
Complex autonomous knowledge work and codingLong-running, multi-step tasks requiring few mistakesEnd-to-end work spanning hours, days, or weeksProblems that are ambiguous or require self-correction
Source: https://docs.claude.com/en/docs/about-claude/models/overview