Claude Fable 5.1 vs Kimi K2-Thinking-0905
Claude Fable 5.1 leads the LLM Stats Score 56.3 to 36.0. Kimi K2-Thinking-0905 is 23.5x cheaper per token.
Anthropic · Moonshot AI · Updated for 2026
Which is better?
Claude Fable 5.1 leads the overall LLM Stats Score 56.3 to 36.0, ranking #2 overall.
In the 1 individual benchmarks reported for both models, Claude Fable 5.1 wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, Kimi K2-Thinking-0905 is roughly 23.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude Fable 5.1 also accepts a larger context window (1,000,000 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
- overall performance matters — it scores 56.3 and ranks #2 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped Sep 2026
Choose Kimi K2-Thinking-0905
- cost matters — it's about 23.5x cheaper per token
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Individual benchmarks
7 reported for Claude Fable 5.1 · 21 for Kimi K2-Thinking-0905
Claude Fable 5.1 outperforms in 1 benchmarks (Humanity's Last Exam), while Kimi K2-Thinking-0905 is better at 0 benchmarks.
Claude Fable 5.1 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Fable 5.1 ($10.00/1M tokens) is 21.3x more expensive than Kimi K2-Thinking-0905 ($0.47/1M tokens).
For output processing, Claude Fable 5.1 ($50.00/1M tokens) is 25.0x more expensive than Kimi K2-Thinking-0905 ($2.00/1M tokens).
In conclusion, Claude Fable 5.1 is more expensive than Kimi K2-Thinking-0905.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Claude Fable 5.1 accepts 1,000,000 input tokens compared to Kimi K2-Thinking-0905's 262,144 tokens. Kimi K2-Thinking-0905 can generate longer responses up to 262,144 tokens, while Claude Fable 5.1 is limited to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Claude Fable 5.1 supports multimodal inputs, whereas Kimi K2-Thinking-0905 does not.
Claude Fable 5.1 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude Fable 5.1
Kimi K2-Thinking-0905
License
Usage and distribution terms
Claude Fable 5.1 is licensed under a proprietary license, while Kimi K2-Thinking-0905 uses MIT.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
MIT
Open weights
Release Timeline
When each model was launched
Claude Fable 5.1 was released on 2026-09-01, while Kimi K2-Thinking-0905 was released on 2025-09-05.
Claude Fable 5.1 is 12 months newer than Kimi K2-Thinking-0905.
Sep 1, 2026
1 weeks ago
12mo newerSep 5, 2025
1.0 years ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Claude Fable 5.1 is available from Anthropic. Kimi K2-Thinking-0905 is available from DeepInfra, Novita, Fireworks.
Claude Fable 5.1
Kimi K2-Thinking-0905
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Fable 5.1 and Kimi K2-Thinking-0905 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Fable 5.1 vs Kimi K2-Thinking-0905.