Claude Fable 5.1
anthropic/claude-fable-5.1- Anthropic
- Family · Claude Fable 5
- Released 1 Sep 2026
- Text · Image · File → Text
- Reasoning · adjustable
- Tools · JSON · Vision
Spec & list price
Context1M
Max output128K
Input / 1M$10.00
Output / 1M$50.005× input
Scores · standing
Intelligence53.4#8/489
LiveBench85.7#1/32
Coding81.6#1/196
Usage
Tokens / day36.3B▼ 4.7% 7d
Usage rank#56
Requests / day181.7K
Tool calls / req0.60
Per request · 30 days
Avg input116.1K7.8× median
Avg output1.2K1.7× median
Cache hit89%1.3× median
Reasoning share46%0.8× median
Tool-call failures0.7%0.3× median
Consumption
Peak 86.6B 23 OctLow 23.5B 1 NovRank today #56
News & trends
35 mentions this week ▲ 192%this model · videos, posts, articles · 30 days
Trending · 14 days
- Claude Code FREE? Claude Fable 5.1 , GPT 6 Astra & Gemini 4 Argon Tutorial + Free Access Methods5.4K views
- How to Use Claude Fable 5.1 & Opus 5.5 for FREE | 2 Million AI Tokens5.0K views
- Kimi K3.1 Pro Just Beat GPT-6 Sol, Astra, and Claude Fable 5.1 in AI Benchmark 🚀375 upvotes
- Claude Fable 5.1 can hide secret messages in benign images3.3K upvotes
News · latest from Claude Fable 5
- GLM-5.3 vs. Claude Fable 5 on DeepSWE: Cost, Coding, and RoutingTogether AI · 21 Aug
- DeepSeek V4 Pro 0813 vs Claude Fable 5 on DeepSWE: Cost, Coding, and RoutingTogether AI · 17 Aug
- Kimi K2.7 Code vs Claude Fable 5: Landing pages that cost 94% lessTogether AI · 17 Jun
Benchmarks
bar = share of the top score · Benchmark data: Artificial AnalysisSpeed · median across 4 providers, latest day
Output speed#193/33458 tok/s1.1× slower than median
Fastest provider64 tok/sbest of 4 providers
First token#3013.32 s3.2× longer than median
First answer token#8541 sthinking included
#8 cheapest of 8 with a similar score
Value
Intelligence Index
Blended price per 1M tokens (log)
Family progress
Intelligence Index
- Family releases53.4
LiveBench suites
Browser89.8
Coding97.7
Data Analysis80.3
Design83.4
Long Agentic77.9
Reasoning91.7
Research82.0
▲ Strongest: Coding, Reasoning. ▼ Weakest: Long Agentic (78).
Technical details
- Reasoning
- on · high
- Tokenizer
- Claude
- Moderation
- moderated
Reasoning effort
- max
- xhigh
- high · default
- medium
- low
Request parameters 11
- tools
- tool_choice
- response_format
- structured_outputs
- reasoning
- reasoning_effort
- include_reasoning
- max_tokens
- max_completion_tokens
- stop
+1 more
- verbosity
Interesting facts
- Less output room than similar models (128.0K against a 535.9K median).
- Released 62 days ago, the newest of 2 Claude Fable 5 models.
When to use
Best for
- Coding agents that edit large codebases
- Browser automation agents
- Long autonomous agent runs
- Hard science and expert reasoning
- Document and image analysis over huge context
Think twice for
- High-volume simple chat (cheaper options exist)
- Self-hosting (closed weights)
- Data analysis (its weakest suite)
- Image generation
Research papers
- InteractiveWorld: A Verifiable Human-Centric Environment for Building Better Interactive MLLM Assistants25 Oct
- Kempe Reachability with $k\geq 3$ Colors Is $\mathsf{PSPACE}$-Complete on Claw-Free Graphs22 Oct
- A Polynomial-Time Algorithm for $k$-Path Vertex Cover Reconfiguration on Trees under Token Sliding22 Oct
- UserSWE: Evaluating Coding Agents in Multi-Turn Conversations with Dynamic Users21 Oct
- Can LLMs predict the outcomes of machine learning experiments?15 Oct
- WorldBench: Evaluating LLMs on Three.js Voxel World Generation7 Oct
- ScholarCatalyst: A Benchmark for Retrieving Papers That Inspire New Research1 Oct
- DrivingBench: Can Vision-Language Models Drive a Toyota Corolla?30 Sep
Social
Most watched and discussed · 90 days
- Claude Code FREE? Claude Fable 5.1 , GPT 6 Astra & Gemini 4 Argon Tutorial + Free Access MethodsThe Tech King · 5.4K views · 27 Oct
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- What Claude Fable 5.1's System Prompt RevealsTODAY IN AI & ROBOTICS · 1.0K views · 28 Oct
- 生成AI勢力図｜Claude Fable 5.1 vs GPT-6 Astra #生成AI #ChatGPT #Claude #Gemini #AI比較Sky | Yellow Lens · 368 views · 29 Oct
- AI vs AI ⚔️ Claude Fable 5.1 vs Claude Sonnet 5 — LLM Battle #26 #ShortsLLMBattles · 258 views · 29 Oct
- Gemini 4 Carbon vs Claude Fable 5.1: 10-Round SHOWDOWNLifey Guy · 219 views · 28 Oct
- AI vs AI ⚔️ Claude Fable 5.1 vs Claude Haiku 4.5 — LLM Battle #28 #ShortsLLMBattles · 217 views · 31 Oct
- AI vs AI ⚔️ Claude Haiku 4.5 vs Claude Fable 5.1 — LLM Battle #22 #ShortsLLMBattles · 214 views · 21 Oct
- A Chinese AI Just Passed Claude Fable 5.1. Where's the Panic?Homegrown Hardware · 197 views · 25 Oct
- Claude Code FREE? Claude Fable 5.1 , GPT 6 Astra & Gemini 4 Argon Tutorial + Free Access MethodsThe Tech King · 110 views · 26 Oct
- Claude Fable 5.1's System Prompt, from Top to BottomTODAY IN AI & ROBOTICS · 96 views · 29 Oct
- Claude Fable 5.1 & Opus 5.5 Free use | Claude Free AI Tokens 200M | claude pro free subscriptionTechnical Jija · 58 views · 1 Nov
Same family
Claude Fable 5- 49.6
Alternatives
other vendors · similar capability- 56.9
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