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Kimi K2 vs Claude Fable 5.1

At a glance

MoonshotAI's large MoE model — 1T total parameters, 32B active.

78131K ctx$0.57/$2.30 per M#32/92

Anthropic's upgraded Mythos-class flagship, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work.

1M ctx$10.00/$50.00 per M
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
CodingInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper95%
Capability
CapabilityECI78.2
Agentic
Terminal Tasks35.7%Task Horizon54min
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Capability
Capability—
Agentic
Terminal Tasks—Task Horizon—
Specs
131K
Context
100K
Max output
Jul 2025
Released
1M
Context
128K
Max output
Sep 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input94%$0.57/M tokens
Output95%$2.30/M tokens
Live pricing, shown before you run
Input$10.00/M tokens
Output$50.00/M tokens
Cache read$0.25/M tokens
Cache write$12.50/M tokens
Web search$0.01/search
Chat with Kimi K2Go to model
Chat with Claude Fable 5.1Go to model
Frequently Asked Questions: Kimi K2 vs Claude Fable 5.1▼

Which is better, Kimi K2 or Claude Fable 5.1?

▼

Both Kimi K2 and Claude Fable 5.1 are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, Kimi K2 or Claude Fable 5.1?

▼

Kimi K2 has a lower blended cost. Kimi K2: $0.57 input / $2.30 output. Claude Fable 5.1: $10.00 input / $50.00 output.

Which has a larger context window, Kimi K2 or Claude Fable 5.1?

▼

Claude Fable 5.1 has a larger context window: Kimi K2 supports 131K tokens vs Claude Fable 5.1 at 1M tokens.

Do both Kimi K2 and Claude Fable 5.1 support vision?

▼

Claude Fable 5.1 supports vision/image input, but Kimi K2 does not.

What are the key differences between Kimi K2 and Claude Fable 5.1?

▼

Key differences: Kimi K2 is significantly cheaper; only Claude Fable 5.1 supports vision input; only Claude Fable 5.1 offers extended reasoning mode. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Kimi K2 and Claude Fable 5.1 for free on idapt.app to see which performs better for your specific needs.

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