Claude Fable 5.1
Anthropicplatform.claude.com/docs/en/models/fable-5-1/ove
For demanding reasoning and long-horizon agentic work
Updated 1 h ago · first seen 11 Sept 2026
model_01M293V7EK3CVA2J99BHKR8PHG
- Context
- 1M tokens
- T1 · 2 h ago
- Released
- 1 Sept 2026
- T1 · 2 h ago
- Knowledge cutoff
- Jun 2026
- T1 · 2 h ago
Specification
- Family
- Claude
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Release date
- 1 Sept 2026
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Status
- active
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Openness
- proprietary
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Context window
- 1M tokens
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Max output
- 128K tokens
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Knowledge cutoff
- Jun 2026
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Training data cutoff
- Jun 2026
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Modalities
- text, image
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Input modalities
- text, image
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Output modalities
- text
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Tokenizer
- Claude
Source:OpenRouter public model & pricing listingT2observed 1 h agomedium
- API model id
- claude-fable-5-1
Source:Claude Developer Platform docsT1observed 2 h agohigh
- API alias
- claude-fable-5-1
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Retirement date
- 1 Sept 2027
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Retirement tentative
- Yes
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Official page
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Bedrock model id
- anthropic.claude-fable-5-1
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Claude aws model id
- claude-fable-5-1
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Default effort
- high
Source:Claude Developer Platform docsT1observed 2 h agohigh
- File input
- Yes
Source:OpenRouter public model & pricing listingT2observed 1 h agomedium
- Foundry model id
- claude-fable-5-1
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Latency tier
- Slower
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Openrouter id
- anthropic/claude-fable-5.1
Source:OpenRouter public model & pricing listingT2observed 1 h agomedium
- Supported parameters
- include_reasoning, max_completion_tokens, max_tokens, reasoning, reasoning_effort, response_format, stop, structured_outputs, tools, verbosity
Source:OpenRouter public model & pricing listingT2observed 1 h agomedium
- Thinking
- Adaptive (always on)
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Vertex model id
- claude-fable-5-1
Source:Claude Developer Platform docsT1observed 2 h agohigh
Each value shows its source, tier and observation time. Conflicting claims are kept side by side and flagged — never averaged. How AI Atlas records facts →
Provenance
Attributed facts
32
Source tiers
T1T226 / 6
Freshest observation
1 h ago
Conflicts
2 flagged
Modalities
- Modalities
- textimage
- Input
- textimage
- Output
- text
Capabilities
Tool calling
Yes
Claude Developer Platform docs · T1
Structured output
Yes
OpenRouter public model & pricing listing · T2
Reasoning
Yes
OpenRouter public model & pricing listing · T2
Vision
Yes
Claude Developer Platform docs · T1
Audio
Unavailable
Fine-tuning available
Unavailable
- Context window
- 1M tokens
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Max output
- 128K tokens
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Knowledge cutoff
- Jun 2026
Source:Claude Developer Platform docsT1observed 2 h agohigh
- Tokenizer
- Claude
Source:OpenRouter public model & pricing listingT2observed 1 h agomedium
No benchmark results recorded
Current prices
| Provider | Input / 1M | Output / 1M | Cached in | Batch in / out | Context | Observed | Source |
|---|---|---|---|---|---|---|---|
| Anthropic APIanthropic/claude-fable-5.1:batch | $5 | $25 | $0.125 | — | 1M | 1 h ago | openrouter.aiT2 |
| Anthropic API | $10 | $50 | $0.25 | — | — | 2 h ago | platform.claude.comT1 |
| Anthropic APIanthropic/claude-fable-5.1 | $10 | $50 | $0.25 | — | 1M | 1 h ago | openrouter.aiT2 |
USD per 1M tokens as published by each provider (USD). Rows are append-only: every change is kept in the history below.
Available through 1
Price history
Input price · USD / 1M tokens
Output price · USD / 1M tokens
- Anthropic API
No hardware estimate available
No lineage recorded
Papers 0
No papers linked yet.
Repositories 0
No repositories linked yet.
As of
Rewind the record: see this entity's attributes exactly as AI Atlas knew them on a given day.
Claim history
Familyfamily1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Claude | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Release daterelease_date1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| 1 Sept 2026 | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Statusstatus1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| active | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Opennessopenness1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| proprietary | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Context windowcontext_length1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| 1M tokens | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Max outputmax_output_tokens1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| 128K tokens | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Knowledge cutoffknowledge_cutoff1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Jun 2026 | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Training data cutofftraining_data_cutoff1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Jun 2026 | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Modalitiesmodalities2conflicting claims
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| image, text | → current | conflicting | OpenRouter public model & pricing listingT2 | medium | deterministic |
| text, image | → current | current | Claude Developer Platform docsT1 | conflicted | deterministic |
Input modalitiesmodalities_input2conflicting claims
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| image, text | → current | conflicting | OpenRouter public model & pricing listingT2 | medium | deterministic |
| text, image | → current | current | Claude Developer Platform docsT1 | conflicted | deterministic |
Output modalitiesmodalities_output1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| text | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Tokenizertokenizer1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Claude | → current | current | OpenRouter public model & pricing listingT2 | medium | deterministic |
API model idapi_model_id1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| claude-fable-5-1 | → current | current | Claude Developer Platform docsT1 | high | deterministic |
API aliasapi_alias1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| claude-fable-5-1 | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Retirement dateretirement_date1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| 1 Sept 2027 | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Retirement tentativeretirement_tentative1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Yes | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Official pageofficial_url1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| https://platform.claude.com/docs/en/models/fable-5-1/overview | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Bedrock model idbedrock_model_id1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| anthropic.claude-fable-5-1 | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Claude aws model idclaude_aws_model_id1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| claude-fable-5-1 | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Default effortdefault_effort1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| high | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Descriptiondescription1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| For demanding reasoning and long-horizon agentic work | → current | current | Claude Developer Platform docsT1 | high | deterministic |
File inputfile_input1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Yes | → current | current | OpenRouter public model & pricing listingT2 | medium | deterministic |
Foundry model idfoundry_model_id1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| claude-fable-5-1 | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Latency tierlatency_tier1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Slower | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Openrouter idopenrouter_id1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| anthropic/claude-fable-5.1 | → current | current | OpenRouter public model & pricing listingT2 | medium | deterministic |
Reasoningreasoning1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Yes | → current | current | OpenRouter public model & pricing listingT2 | medium | deterministic |
Structured outputstructured_output1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Yes | → current | current | OpenRouter public model & pricing listingT2 | medium | deterministic |
Supported parameterssupported_parameters1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| include_reasoning, max_completion_tokens, max_tokens, reasoning, reasoning_effort, response_format, stop, structured_outputs, tools, verbosity | → current | current | OpenRouter public model & pricing listingT2 | medium | deterministic |
Thinkingthinking1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Adaptive (always on) | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Tool callingtool_calling1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Yes | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Vertex model idvertex_model_id1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| claude-fable-5-1 | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Visionvision1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Yes | → current | current | Claude Developer Platform docsT1 | high | deterministic |
Claims are temporal and append-only: a new observation closes the previous claim (valid_to) instead of overwriting it. Conflicting claims from different sources are kept side by side and flagged — never averaged. Methodology →
Anthropic API lists Claude Fable 5.1 at $5 in / $25 out per 1M tokens
openrouterAnthropic API lists Claude Fable 5.1 at $10 in / $50 out per 1M tokens
openrouterAnthropic API lists Claude Fable 5.1 at $10 in / $50 out per 1M tokens
anthropic
| Source | Document | Type | Tier | Last observed | Snapshots |
|---|---|---|---|---|---|
| Claude Developer Platform docs | docs.claude.com/en/docs/about-claude/models/overview.md | model_docs | T1· Official | 2 h ago | 1 |
| Claude Developer Platform docs | docs.claude.com/en/docs/about-claude/pricing.md | pricing | T1· Official | 2 h ago | 1 |
| Claude Developer Platform docs | platform.claude.com/docs/en/models/fable-5-1/overview.md | model_page | T1· Official | 2 h ago | 1 |
| OpenRouter public model & pricing listing | openrouter.ai/api/v1/models | catalogue | T2· Quality secondary | 1 h ago | 1 |
Tier 1 = official/primary, 2 = quality secondary, 3 = community, 4 = unverified. Every snapshot is archived; see all sources and the methodology.