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AnthropicClaude Fable 5.1

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Claude Fable 5.1 is Anthropic's generally available model for demanding reasoning, long-horizon agentic work, multistep research, and document creation.

Token context
1,000K tokens
Inputs
Text, Image
Outputs
Text
Released
Sep 1, 2026

Benchmark Market Position

Intelligence, Cost, and Efficiency

All rankings →

Intelligence

Rank #2 of 57

  1. 100.0*Claude Opus 5.5
  2. 99.0Claude Fable 5.1
  3. 90.9*GPT-5.5 Pro
  4. 90.0Gemini 3.8 Flash
  5. 85.9GPT-6.1 Sol
  6. 84.6GPT-6 Astra
  7. 83.4*Qwen3.8 Max
  8. 83.3*DeepSeek V4.1 Flash
  9. 82.1Gemini 3.1 Pro
  10. 77.3GPT-5.6 Terra
  11. 74.0*Grok 4.7
  12. 73.5*ERNIE 5.1
  13. 73.3Kimi K3
  14. 71.9*GLM 5.3
  15. 67.5*Qwen3.8 Flash
  16. 64.3*Grok 4.20 Multi Agent
  17. 63.3*Qwen3.7 Plus
  18. 63.1*Claude Sonnet 5
  19. 57.9*DeepSeek V4 Pro
  20. 56.2*GLM 5.3 Flash
  21. 54.6*Mistral Large 4
  22. 54.3*Gemma 4 31B
  23. 52.2Qwen3.8 27B
  24. 50.5*Qwen3.5 397B A17B
  25. 50.1*Hy3
  26. 47.4*Gemma 4 26B A4B
  27. 47.4Inkling
  28. 43.0*Mistral Large 3
  29. 42.3GPT-6 Luna
  30. 37.8*NVIDIA Nemotron 3 Ultra 550B A55B BF16
  31. 35.2*Inkling Small
  32. 33.9*MiniMax M3
  33. 27.0*Kimi K2.7 Code
  34. 25.1*Grok Build 0.1
  35. 20.8GPT-5.4 Mini
  36. 17.8Gemini 3.5 Flash Lite
  37. 17.2*Qwen3.5 35B A3B
  38. 15.7GPT-5.4 Nano
  39. 12.8*Muse Glimmer 30B
  40. 11.7*Solar Pro 4
  41. 9.3*Claude Haiku 4.5
  42. 0.4*DeepSeek R1
  43. 0.0*Olmo 3 32B Think
  44. 0.0*Nova 2 Lite
  45. 0.0*Command A
  46. 0.0*Granite 4.2 30B
  47. 0.0*Granite 4.2 3B
  48. 0.0*Granite 4.2 8B
  49. 0.0*Llama 4 Maverick 17B 128E Instruct
  50. 0.0*Llama 4 Scout 17B 16E Instruct
  51. 0.0*phi-4
  52. 0.0*NVIDIA Nemotron 3 Nano 30B A3B BF16
  53. 0.0*NVIDIA Nemotron 3.5 Lightning 30B A3B
  54. 0.0*GPT-4o
  55. 0.0*GPT-4o Mini
  56. 0.0*gpt-oss-120b
  57. 0.0*gpt-oss-20b
* Provisional: fewer than 3 sources
View full ranking →

Cost

Rank #27 of 27

  1. $0.0020Grok Build 0.1
  2. $0.0087GLM 5.3 Flash
  3. $0.017MiniMax M3
  4. $0.018GPT-6 Luna
  5. $0.021Qwen3.8 Flash
  6. $0.022DeepSeek V4.1 Flash
  7. $0.029Gemini 3.5 Flash Lite
  8. $0.044Kimi K2.7 Code
  9. $0.054Mistral Large 4
  10. $0.054DeepSeek V4 Pro
  11. $0.058GPT-5.4 Nano
  12. $0.063Qwen3.8 27B
  13. $0.090Inkling
  14. $0.092NVIDIA Nemotron 3 Ultra 550B A55B BF16
  15. $0.104GPT-6.1 Sol
  16. $0.107Qwen3.8 Max
  17. $0.160Gemini 3.8 Flash
  18. $0.161Gemini 3.1 Pro
  19. $0.163Kimi K3
  20. $0.194Claude Sonnet 5
  21. $0.214GPT-5.4 Mini
  22. $0.248GLM 5.3
  23. $0.266GPT-5.6 Terra
  24. $0.341Grok 4.7
  25. $0.512Claude Opus 5.5
  26. $0.520GPT-6 Astra
  27. $0.824Claude Fable 5.1
View full ranking →

Efficiency

Rank #14 of 27

  1. 71.7*DeepSeek V4.1 Flash
  2. 65.8*GLM 5.3 Flash
  3. 64.2*Qwen3.8 Flash
  4. 62.5*Grok Build 0.1
  5. 60.1GPT-6.1 Sol
  6. 58.6*Qwen3.8 Max
  7. 58.5Gemini 3.8 Flash
  8. 54.6Gemini 3.1 Pro
  9. 53.9*Claude Opus 5.5
  10. 52.8GPT-6 Luna
  11. 51.5*DeepSeek V4 Pro
  12. 50.1Kimi K3
  13. 49.9*Mistral Large 4
  14. 49.5Claude Fable 5.1
  15. 49.0*MiniMax M3
  16. 48.0GPT-5.6 Terra
  17. 47.3Qwen3.8 27B
  18. 46.1GPT-6 Astra
  19. 45.9*GLM 5.3
  20. 44.3*Grok 4.7
  21. 43.5*Claude Sonnet 5
  22. 42.0Inkling
  23. 37.8*Kimi K2.7 Code
  24. 37.1*NVIDIA Nemotron 3 Ultra 550B A55B BF16
  25. 36.6Gemini 3.5 Flash Lite
  26. 29.9GPT-5.4 Nano
  27. 21.6GPT-5.4 Mini
* Provisional: fewer than 3 sources
View full ranking →

The orange outline marks Claude Fable 5.1. Each available panel preserves its real rank and value; missing benchmark or pricing inputs remain explicitly unranked.

Providers & Pricing

Estimate workload cost →
ProviderInput / 1MOutput / 1MCache read / 1MCache write / 1MObservedEvidence
$10.00$50.00$0.25$12.50Sep 3, 2026Provider-reported

Benchmarks

All benchmark results →
ARC-AGI-1verified-v1-613c385b0c9397.50percent——Claude Fable 5.1 (Max)unknownOriginal sourcewinner eligibleThird-party benchmark
ARC-AGI-2verified-v2-be40992860f990.00percent——Claude Fable 5.1 (XHigh)unknownOriginal sourcewinner eligibleThird-party benchmark
LiveBench2026-06-25-90f8d44da96586.82percent16,4701,270claude-fable-5-1-max-effortaverage per caseRecomputedwinner eligibleThird-party benchmark
LMArena Agent Arenaagent-2026-10-16-a64ca3b12b6e14.03score—16,374Claude Fable 5.1 (Max); 95% CI [12.03932907, 16.02502568]; sessions 16374; observations 1913479; rank 3unknownOriginal sourcewinner eligibleThird-party benchmark
LMArena Document Arenadocument-2026-09-13-a64ca3b12b6e1,512.58rating—1,403claude-fable-5.1-max; 95% CI [1497.40364732, 1527.76498981]; votes 1403; rank 2unknownOriginal sourcewinner eligibleThird-party benchmark
LMArena Search Arenasearch-2026-10-13-a64ca3b12b6e1,245.85rating—12,782claude-fable-5.1-high; 95% CI [1238.79268797, 1252.89817971]; votes 12782; rank 5unknownOriginal sourcewinner eligibleThird-party benchmark
LMArena Vision Arenavision-2026-10-09-a64ca3b12b6e1,318.24rating—4,648claude-fable-5.1-max; 95% CI [1308.61778049, 1327.86146111]; votes 4648; rank 4unknownOriginal sourcewinner eligibleThird-party benchmark
ToneBench2026-10-17-10-task-e9c76358afb284.53points68,65350Claude Fable 5.1 (max effort)average per caseOriginal sourcenot winner eligibleThird-party benchmark
ToneBench2026-10-17-10-task-e9c76358afb283.41points34,28450Claude Fable 5.1 (high)average per caseOriginal sourcenot winner eligibleThird-party benchmark

At a Glance

Model Facts

Identity

Status
active
Developer ID
claude-fable-5-1
Released
Sep 1, 2026
Version
Claude Fable 5.1
License
Unknown

Capacity

Token context
1,000K tokens
Maximum output
128K tokens
Total parameters
Unknown
Active parameters
Unknown
Knowledge cutoff
Jun 1, 2026

Interface and Access

Inputs
Text, Image
Outputs
Text
API available
Yes
Open weights
No
Self-hostable
No
Reasoning
Yes
Vision
Yes
Tool calling
Yes
Capabilities
chat, generation, reasoning, tools

This page represents one developer model product. Dated API snapshots, serving endpoints, pricing, regions, quantizations, and service tiers attach as versioned aliases or provider details and never create duplicate public model records.

Version Lineage

PredecessorUnknown
SuccessorsUnknown
Aliasesclaude-fable-5-1

Explicit Unknowns

  • Architecture
  • Tokenizer

Primary Evidence

Sources and Observation Date

Claude Fable 5.1 | Claude Platform DocsAnthropic · observed Sep 2, 2026Claude Fable 5.1 | Claude Platform DocsAnthropic · observed Sep 3, 2026Claude Fable 5.1 and Mythos 5.1Anthropic · observed Sep 2, 2026Anthropic catalogAnthropic · observed Oct 19, 2026

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Questions

Claude Fable 5.1 FAQs

What is Claude Fable 5.1?+

Claude Fable 5.1 is Anthropic's generally available model for demanding reasoning, long-horizon agentic work, multistep research, and document creation. It is developed by Anthropic and its current sourced lifecycle status is active.

What inputs and outputs does Claude Fable 5.1 support?+

Claude Fable 5.1's current record lists Text and Image as input and Text as output.

How much context does Claude Fable 5.1 support?+

The current record lists a 1,000K-token context window and a maximum output of 128K tokens.

Is Claude Fable 5.1 available through an API?+

Claude Fable 5.1 is marked as API-available. The directly sourced provider records currently include Anthropic.

How much does Claude Fable 5.1 cost through an API?+

The lowest directly sourced prices currently attached to Claude Fable 5.1 are $10.00 per million input tokens through Anthropic and $50.00 per million output tokens through Anthropic. Prices are provider-specific and should be checked against each cited observation date.

What capabilities and tasks does Claude Fable 5.1 support?+

Claude Fable 5.1's recorded capabilities are chat, generation, reasoning, and tools. Its supported tasks are image and text.

Can Claude Fable 5.1 be self-hosted?+

Claude Fable 5.1 is not marked as an open-weight model. Self-hosting is marked as unsupported, with no license recorded.

Does Claude Fable 5.1 have related versions or aliases?+

No predecessor is recorded. No successor is recorded. Recorded aliases are claude-fable-5-1.

Which models can Claude Fable 5.1 be compared with?+

The current compatible peer set includes Claude Fable 5, GPT-6 Astra, Gemini 3.1 Pro, Grok 4.6, and Kimi K3. Compatibility requires shared sourced modalities and tasks; it does not imply that one model is better. Browse model comparisons →

How current is the Model Markets record for Claude Fable 5.1?+

Claude Fable 5.1 was last verified Sep 2, 2026 from Anthropic's primary source, “Claude Fable 5.1 | Claude Platform Docs.” The evidence is classified as official fact.

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