Claudemoderated

Anthropic: Claude Fable 5.1

anthropic/claude-fable-5.1

canonical: anthropic/claude-fable-5.1-20260831

Descriptionfrom OpenRouter

Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...

Context length

1,000,000 tok

Max completion

128,000 tok

Knowledge cutoff

—

Expires

—

Added to OpenRouter

9/1/2026

Cache last refreshed

11/12/2026

Primary modality

text+image+file->text

Source

OpenRouter

Input modalities

textimagefile

Output modalities

text

Pricing

Field	Per token (USD)	Per million
prompt	0.00001	$10.0
completion	0.00005	$50.0
web_search	0.01	$10000
input_cache_read	0.00000025	$0.250
input_cache_write	0.0000125	$12.5
input_cache_write_1h	0.00002	$20.0

Supported parameters(11)

include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatstopstructured_outputstool_choicetoolsverbosity

OpenRouter page

Videos

19:45

Fable 5.1 writes an animated novel using Ren'Py... did it do better than Sol Pro 5.6?

Sep 1, 2026 · YouTube

Rounds

13 answersin this database. A round opens every model's answer to the same prompt.

Sep 10, 2026CodingThe same soldierin a video round answer
Sep 4, 2026MedicineThe Worried Patient Replyin a video round answer
Sep 4, 2026MedicineIt's Never Lupusin a video round answer
Sep 4, 2026MedicineThe Poisoned Premise Clinicin a video round answer
Sep 4, 2026MedicineThe Drug Interaction Deskin a video round answer
Sep 4, 2026MedicineThe Worried Patient Replyround answer
Sep 4, 2026MedicineIt's Never Lupusround answer
Sep 4, 2026MedicineThe Poisoned Premise Clinicround answer
Sep 4, 2026MedicineThe Drug Interaction Deskround answer
Sep 1, 2026CodingThe same soldierin a video round answer
Sep 1, 2026Psychology & Business AcumenThe email you don't want to sendin a video round answer
Sep 1, 2026CodingRosebud 2045in a video round answer
Sep 1, 2026CodingThe Cybertruck rallyin a video round answer