GET

/v1/models/anthropic/claude-fable-5-1

Accept:

provider anthropicstatus activefirst seen Aug 28, 2026last seen 13m ago

rawId	claude-fable-5-1
displayName	Claude Fable 5.1
id	anthropic-claude-fable-5-1
activity	chat
schemaEndpointId	v1/messages input · output
releasedAt	1787875200 — Aug 28, 2026
firstSeenAt	1787875200 — Aug 28, 2026
lastSeenAt	1794561319 — 13m ago
pricing	$10 / 1M input · $50 / 1M output → open calculator https://platform.claude.com/docs/en/about-claude/pricing.md cache_read_tokens (usage) · cache_write_1h_tokens (usage) · cache_write_tokens (usage) · input_tokens (usage) · output_tokens (usage)
contextWindow	1000000
maxOutput	128000
modalities	{"input":["text","image","file"],"output":["text"]}
capabilities	{"reasoning":true,"reasoning_effort":true,"structured_outputs":true,"response_format":true,"max_tokens":true,"tool_choice":true,"tools":true,"temperature":false,"top_p":false,"top_k":false}
knowledgeCutoff · openWeights · weightsUrl · requestMap · providerMetadata	not published by this provider’s list endpoint

Endpoints & schemas

GET /v1/schemas/anthropic →

endpoint	activity
v1/messages input · output	chat
v1/messages/count_tokens input · output	chat
v1/messages/count_tokens?beta=true input · output	chat

endpoints matching this model — the provider has more, see /v1/schemas/anthropic

Sources

field	recorded source
contextWindow	Source unknown — no source URL recorded. listing
maxOutput	Source unknown — no source URL recorded. listing
modalities	Source unknown — no source URL recorded. listing
pricing	Source linked above. docs-derived Pricing Source trace `f71573e3b8280316d567a310cdc9a469c6c56a3a0c13d9156446e4af340be39e`
reasoning	https://platform.claude.com/docs/en/build-with-claude/thinking-troubleshooting.md docs-derived claude fable 5.1 Source trace `07abe1c4f4af8afa678fb2801bdfffaa1298dff98bc7b5ba8e388d07ea151fe5`
capabilities.reasoning	Source unknown — no source URL recorded. listing
capabilities.reasoning_effort	Source unknown — no source URL recorded. listing
capabilities.structured_outputs	Source unknown — no source URL recorded. listing
capabilities.response_format	Source unknown — no source URL recorded. listing
capabilities.temperature	https://platform.claude.com/docs/en/models/fable-5-1/migration-guide docs-derived sampling parameters
capabilities.top_p	https://platform.claude.com/docs/en/models/fable-5-1/migration-guide docs-derived sampling parameters
capabilities.top_k	https://platform.claude.com/docs/en/models/fable-5-1/migration-guide docs-derived sampling parameters
capabilities.max_tokens	https://raw.githubusercontent.com/anthropics/anthropic-sdk-typescript/main/scripts/mock-spec.json.gz upstream-spec /properties/max_tokens Source trace `f538a797852ce3661320bc652376cab2d3bdbed6c8ce35b79589252a43c25b05` { "endpointId": "v1/messages", "fetchedAt": 1792819228 }
capabilities.tool_choice	https://raw.githubusercontent.com/anthropics/anthropic-sdk-typescript/main/scripts/mock-spec.json.gz upstream-spec /properties/tool_choice Source trace `f538a797852ce3661320bc652376cab2d3bdbed6c8ce35b79589252a43c25b05` { "endpointId": "v1/messages", "fetchedAt": 1792819228 }
capabilities.tools	https://raw.githubusercontent.com/anthropics/anthropic-sdk-typescript/main/scripts/mock-spec.json.gz upstream-spec /properties/tools Source trace `f538a797852ce3661320bc652376cab2d3bdbed6c8ce35b79589252a43c25b05` { "endpointId": "v1/messages", "fetchedAt": 1792819228 }
serverTools.web_search_20250305	https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-search-tool docs-derived serverTools.web_search_20250305
serverTools.web_search_20260209	https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-search-tool docs-derived serverTools.web_search_20260209
serverTools.web_search_20260318	https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-search-tool docs-derived serverTools.web_search_20260318
serverTools.web_fetch_20250910	https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-fetch-tool docs-derived serverTools.web_fetch_20250910
serverTools.web_fetch_20260209	https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-fetch-tool docs-derived serverTools.web_fetch_20260209
serverTools.web_fetch_20260309	https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-fetch-tool docs-derived serverTools.web_fetch_20260309
serverTools.web_fetch_20260318	https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-fetch-tool docs-derived serverTools.web_fetch_20260318
serverTools.code_execution_20250825	https://platform.claude.com/docs/en/agents-and-tools/tool-use/code-execution-tool docs-derived serverTools.code_execution_20250825
serverTools.code_execution_20260120	https://platform.claude.com/docs/en/agents-and-tools/tool-use/code-execution-tool docs-derived serverTools.code_execution_20260120
serverTools.code_execution_20260521	https://platform.claude.com/docs/en/agents-and-tools/tool-use/code-execution-tool docs-derived serverTools.code_execution_20260521
serverTools.advisor_20260301	https://platform.claude.com/docs/en/agents-and-tools/tool-use/advisor-tool docs-derived serverTools.advisor_20260301
serverTools.tool_search_tool_regex_20251119	https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool docs-derived serverTools.tool_search_tool_regex_20251119
serverTools.tool_search_tool_bm25_20251119	https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool docs-derived serverTools.tool_search_tool_bm25_20251119
serverTools.mcp_toolset	https://platform.claude.com/docs/en/agents-and-tools/mcp-connector docs-derived serverTools.mcp_toolset
serverTools.memory_20250818	https://platform.claude.com/docs/en/agents-and-tools/tool-use/memory-tool docs-derived serverTools.memory_20250818
serverTools.bash_20250124	https://platform.claude.com/docs/en/agents-and-tools/tool-use/bash-tool docs-derived serverTools.bash_20250124
serverTools.text_editor_20250728	https://platform.claude.com/docs/en/agents-and-tools/tool-use/text-editor-tool docs-derived serverTools.text_editor_20250728
serverTools.computer_toolset_20260801	https://platform.claude.com/docs/en/agents-and-tools/tool-use/computer-use-tool docs-derived serverTools.computer_toolset_20260801
serverTools.computer_20251124	https://platform.claude.com/docs/en/agents-and-tools/tool-use/computer-use-tool docs-derived serverTools.computer_20251124
serverTools.browser_toolset_20260801	https://platform.claude.com/docs/en/agents-and-tools/tool-use/browser-use-tool docs-derived serverTools.browser_toolset_20260801
activity	Source unknown — no source URL recorded.
requestMap	Source unknown — no source URL recorded.
schemaEndpointId	Source unknown — no source URL recorded.

Use it

shell

$ curl https://modelschemas.com/v1/schemas/anthropic/chat/v1/messages # request schema
$ curl -X POST https://modelschemas.com/v1/validate -d '{"provider":"anthropic","endpointId":"v1/messages","payload":{…}}'
$ curl -X POST https://modelschemas.com/v1/estimate -d '{"provider":"anthropic","model":"claude-fable-5-1","usage":{"input_tokens":1200,"output_tokens":400}}'