Claude Fable 5.1 vs Kimi K3

Claude Fable 5.1 and Kimi K3 are closely matched at 54.8 and 54.5 on the LLM Stats Score. Kimi K3 is 3.3x cheaper per token.

Anthropic · Moonshot AI · Updated for 2026

Which is better?

Claude Fable 5.1 and Kimi K3 are closely matched on the overall LLM Stats Score at 54.8 and 54.5.

In the 2 individual benchmarks reported for both models, Claude Fable 5.1 wins 2; this is a narrower head-to-head signal than the composite indexes.

On price, Kimi K3 is roughly 3.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Kimi K3 also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Fable 5.1

you value its reported benchmark strengths — it wins 2 of 2 exact shared results
you want the most recent training data — it shipped Sep 2026

Choose Kimi K3

cost matters — it's about 3.3x cheaper per token
you process long inputs — it offers a 1,048,576 token context window
you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Better token value: Kimi K3

Core performance indexes

LLM Stats Score

54.8

#5 · 4 evals

Best

54.5

#6 · 26 evals

Reasoning

52.1

#7 · 3 evals

53.3

#4 · 20 evals

Best

Agents

39.3

#6 · 3 evals

40.3

#3 · 17 evals

Best

Cost, coverage & limits

Benchmark wins

2 of 2

Best

0 of 2

Input price

$10.00 / M

$3.00 / M

Best

Output price

$50.00 / M

$15.00 / M

Best

Context window

1,000,000

1,048,576

Best

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared

Index

Claude Fable 5.1

Kimi K3

Vision

40.5#1 · 2 evals

37.8#4 · 8 evals

Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

7 reported for Claude Fable 5.1 · 31 for Kimi K3

2 shared

Claude Fable 5.1 outperforms in 2 benchmarks (AutomationBench, Humanity's Last Exam), while Kimi K3 is better at 0 benchmarks.

Claude Fable 5.1 significantly outperforms across most benchmarks.

Wed Sep 02 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Kimi K3 costs less

For input processing, Claude Fable 5.1 ($10.00/1M tokens) is 3.3x more expensive than Kimi K3 ($3.00/1M tokens).

For output processing, Claude Fable 5.1 ($50.00/1M tokens) is 3.3x more expensive than Kimi K3 ($15.00/1M tokens).

In conclusion, Claude Fable 5.1 is more expensive than Kimi K3.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers

Wed Sep 02 2026 • llm-stats.com

Claude Fable 5.1

Input tokens$10.00

Output tokens$50.00

Best providerAnthropic

Kimi K3

Input tokens$3.00

Output tokens$15.00

Best providerFireworks

Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Kimi K3 accepts 1,048,576 input tokens compared to Claude Fable 5.1's 1,000,000 tokens. Kimi K3 can generate longer responses up to 1,048,576 tokens, while Claude Fable 5.1 is limited to 128,000 tokens.

Claude Fable 5.1

Input1,000,000 tokens

Output128,000 tokens

Kimi K3

Input1,048,576 tokens

Output1,048,576 tokens

Wed Sep 02 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Fable 5.1 and Kimi K3 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Fable 5.1

Text

Images

Audio

Video

Kimi K3

Text

Images

Audio

Video

License

Usage and distribution terms

Claude Fable 5.1 is licensed under a proprietary license, while Kimi K3 uses Kimi K3 License.

License differences may affect how you can use these models in commercial or open-source projects.

Claude Fable 5.1

Proprietary

Closed source

Kimi K3

Kimi K3 License

Open weights

Release Timeline

When each model was launched

Claude Fable 5.1 was released on 2026-09-01, while Kimi K3 was released on 2026-07-16.

Claude Fable 5.1 is 2 months newer than Kimi K3.

Claude Fable 5.1

Sep 1, 2026

0 days ago

1mo newer

Kimi K3

Jul 16, 2026

1 months ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

Claude Fable 5.1 is available from Anthropic. Kimi K3 is available from Fireworks, Moonshot AI, Novita, Together.

Claude Fable 5.1

Anthropic

Input Price:Input: $10.00/1MOutput Price:Output: $50.00/1M

Kimi K3

Fireworks

Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

Unknown Organization

Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

Novita

Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

Together

Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Fable 5.1 and Kimi K3 side-by-side, then vote on the output you prefer.

Claude Fable 5.1

✓ Preferred

Kimi K3

Open in Playground

FAQ

Common questions about Claude Fable 5.1 vs Kimi K3.

Which is better, Claude Fable 5.1 or Kimi K3?

Claude Fable 5.1 and Kimi K3 are closely matched on the LLM Stats Score at 54.8 and 54.5. Claude Fable 5.1 is made by Anthropic and Kimi K3 is made by Moonshot AI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Fable 5.1 compare to Kimi K3 in benchmarks?

Claude Fable 5.1 scores OSWorld 2.0: 77.9%, CursorBench v3.2: 73.4%, Humanity's Last Exam: 65.0%, GDPval-AA: 61.8%, Terminal-Bench 4.0: 55.8%. Kimi K3 scores MathVision: 97.8%, DeepSearchQA: 95.0%, GPQA: 93.5%, CharXiv-R: 91.3%, BrowseComp: 91.2%.

Is Claude Fable 5.1 cheaper than Kimi K3?

Kimi K3 is 3.3x cheaper for input tokens. Claude Fable 5.1 costs $10.00/M input and $50.00/M output via anthropic. Kimi K3 costs $3.00/M input and $15.00/M output via fireworks.

What are the context window sizes for Claude Fable 5.1 and Kimi K3?

Claude Fable 5.1 supports 1.0M tokens and Kimi K3 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Fable 5.1 and Kimi K3?

Key differences include LLM Stats Score (54.8 vs 54.5), context window (1.0M vs 1.0M), input pricing ($10.00 vs $3.00/M), licensing (Proprietary vs Kimi K3 License). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Fable 5.1 and Kimi K3?

Claude Fable 5.1 is developed by Anthropic and Kimi K3 is developed by Moonshot AI.

Claude Fable 5.1 vs Kimi K3