Anthropic: Claude Fable 5.1

anthropic/claude-fable-5.1

Last Observed: 2026-10-15 06:03:55.652821 UTC

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...

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Architecture And Modalities · 3

Architecture · Instruct Type API Details /architecture/instruct_type Explicit Null	Explicit Null
Architecture · Modality API Details /architecture/modality text+image+file->text	text+image+file->text
Architecture · Tokenizer API Details /architecture/tokenizer Claude	Claude

Benchmarks · 3

Benchmarks · Artificial Analysis · Agentic Index API Details /benchmarks/artificial_analysis/agentic_index 57.9	57.9
Benchmarks · Artificial Analysis · Coding Index API Details /benchmarks/artificial_analysis/coding_index 81.6	81.6
Benchmarks · Artificial Analysis · Intelligence Index API Details /benchmarks/artificial_analysis/intelligence_index 53.4	53.4

Catalog Identity And Metadata · 11

Canonical Slug API Details /canonical_slug anthropic/claude-fable-5.1-20260831	anthropic/claude-fable-5.1-20260831
Context Tokens API Details /context_length 1000000	1,000,000
Created API Details /created 1788285838	2026-09-01 18:03:58 UTC
Description API Details /description 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...	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...
Expiration Date API Details /expiration_date Explicit Null	Explicit Null
Hugging Face Id API Details /hugging_face_id Explicit Null	Explicit Null
Id API Details /id anthropic/claude-fable-5.1	anthropic/claude-fable-5.1
Knowledge Cutoff API Details /knowledge_cutoff Explicit Null	Explicit Null
Links · Details API Details /links/details /api/v1/models/anthropic/claude-fable-5.1-20260831/endpoints	/api/v1/models/anthropic/claude-fable-5.1-20260831/endpoints
Name API Details /name Anthropic: Claude Fable 5.1	Anthropic: Claude Fable 5.1
Supported Voices API Details /supported_voices Explicit Null	Explicit Null

Request Limits · 1

Per Request Limits API Details /per_request_limits Explicit Null	Explicit Null

Pricing · 6

Output Price · USD/Token API Details /pricing/completion 0.00005	0.00005
Pricing · Input Cache Read API Details /pricing/input_cache_read 0.00000025	0.00000025
Pricing · Input Cache Write API Details /pricing/input_cache_write 0.0000125	0.0000125
Pricing · Input Cache Write 1h API Details /pricing/input_cache_write_1h 0.00002	0.00002
Input Price · USD/Token API Details /pricing/prompt 0.00001	0.00001
Pricing · Web Search API Details /pricing/web_search 0.01	0.01

Reasoning · 2

Reasoning · Default Effort API Details /reasoning/default_effort high	high
Reasoning · Mandatory API Details /reasoning/mandatory True	True

Provider Limits · 3

Top Provider · Context Length API Details /top_provider/context_length 1000000	1,000,000
Top Provider · Is Moderated API Details /top_provider/is_moderated True	True
Top Provider · Max Completion Tokens API Details /top_provider/max_completion_tokens 128000	128,000

API Structure And Container Types

Architecture API Details /architecture Object · See Fields	Object · See Fields
Architecture · Input Modalities API Details /architecture/input_modalities Array · See Items	Array · See Items
Architecture · Output Modalities API Details /architecture/output_modalities Array · See Items	Array · See Items
Benchmarks API Details /benchmarks Object · See Fields	Object · See Fields
Benchmarks · Artificial Analysis API Details /benchmarks/artificial_analysis Object · See Fields	Object · See Fields
Benchmarks · Design Arena API Details /benchmarks/design_arena Array · See Items	Array · See Items
Default Parameters API Details /default_parameters Object · See Fields	Object · See Fields
Links API Details /links Object · See Fields	Object · See Fields
Pricing API Details /pricing Object · See Fields	Object · See Fields
Reasoning API Details /reasoning Object · See Fields	Object · See Fields
Reasoning · Supported Efforts API Details /reasoning/supported_efforts Array · See Items	Array · See Items
Supported Parameters API Details /supported_parameters Array · See Items	Array · See Items
Top Provider API Details /top_provider Object · See Fields	Object · See Fields

Architecture · Input Modalities

3 items · source order preserved

text
image
file

API Details

Item	/architecture/input_modalities/*
1	text
2	image
3	file

Architecture · Output Modalities

1 items · source order preserved

text

API Details

Item	/architecture/output_modalities/*
1	text

Supported Parameters

11 items · source order preserved

include_reasoning
max_completion_tokens
max_tokens
reasoning
reasoning_effort
response_format
stop
structured_outputs
tool_choice
tools
verbosity

API Details

Item	/supported_parameters/*
1	include_reasoning
2	max_completion_tokens
3	max_tokens
4	reasoning
5	reasoning_effort
6	response_format
7	stop
8	structured_outputs
9	tool_choice
10	tools
11	verbosity

Benchmarks · Design Arena

13 items · source order preserved

Item	Arena	Category	Elo	Rank	Win Rate
1	agents	fullstack	1326	1	57.2
2	agents	godotgamedev	1327	1	60.7
3	agents	mobileapps	1265	3	56.3
4	agents	python-pptxslides	1328	1	62.6
5	agents	webapps	1311	1	56.1
6	models	3d	1393	6	67.7
7	models	asciiart	1325	3	65
8	models	codecategories	1338	7	59.3
9	models	dataviz	1346	5	61.8
10	models	gamedev	1384	3	65.6
11	models	svg	1301	5	56.4
12	models	uicomponent	1341	9	59.6
13	models	website	1314	9	56.3

API Details

Item	/benchmarks/design_arena/*/arena	/benchmarks/design_arena/*/category	/benchmarks/design_arena/*/elo	/benchmarks/design_arena/*/rank	/benchmarks/design_arena/*/win_rate
1	agents	fullstack	1326	1	57.2
2	agents	godotgamedev	1327	1	60.7
3	agents	mobileapps	1265	3	56.3
4	agents	python-pptxslides	1328	1	62.6
5	agents	webapps	1311	1	56.1
6	models	3d	1393	6	67.7
7	models	asciiart	1325	3	65
8	models	codecategories	1338	7	59.3
9	models	dataviz	1346	5	61.8
10	models	gamedev	1384	3	65.6
11	models	svg	1301	5	56.4
12	models	uicomponent	1341	9	59.6
13	models	website	1314	9	56.3

Reasoning · Supported Efforts

5 items · source order preserved

max
xhigh
high
medium
low

API Details

Item	/reasoning/supported_efforts/*
1	max
2	xhigh
3	high
4	medium
5	low

Recorded Value History

Historical API Field

Input Price · USD/Token

5 of 5 records plotted · 0 excluded for missing or invalid coordinates.

Up to 100 recorded versions, spaced by observation order rather than elapsed time. Array fields use the minimum numeric item in each version. Missing values are omitted. Select a point to open its archived snapshot; comparison actions use the current listing. History begins at the first recorded baseline.

Axis Scale

Select a point to open its listing or add it to compare.

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