Catalog Changes · 2026-10-13 18:02:17.144297

Anthropic: Claude Fable 5.1 · 2026-10-13 18:02:17.144297 UTC

OpenRouter

4 Changed Fields

Field / Array Position	Previous Value	Observed Value
Benchmarks · Design Arena[11] · Rank	8	9
Benchmarks · Design Arena[5] · Elo	1396	1393
Benchmarks · Design Arena[5] · Rank	5	6
Benchmarks · Design Arena[7] · Rank	6	7

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Anthropic: Claude Fable 5.1

anthropic/claude-fable-5.1

OpenRouter Catalog Changes

Last Observed: 2026-10-13 18:02:17.144297 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	1325	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	1310	1	56.1
6	models	3d	1393	6	67.7
7	models	asciiart	1324	3	65
8	models	codecategories	1340	7	59.3
9	models	dataviz	1348	5	61.8
10	models	gamedev	1387	3	65.6
11	models	svg	1302	5	56.4
12	models	uicomponent	1342	9	59.6
13	models	website	1315	8	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	1325	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	1310	1	56.1
6	models	3d	1393	6	67.7
7	models	asciiart	1324	3	65
8	models	codecategories	1340	7	59.3
9	models	dataviz	1348	5	61.8
10	models	gamedev	1387	3	65.6
11	models	svg	1302	5	56.4
12	models	uicomponent	1342	9	59.6
13	models	website	1315	8	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