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Claude Fable 5.1 vs Grok 4.1 Fast

At a glance

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

Fast agentic model with 2M context window and tool calling.

2M ctx
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
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
No benchmarks available

This model hasn't been benchmarked yet.

Specs
1M
Context
128K
Max output
Sep 2026
Released
2M
Context
33K
Max output
—
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
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
Pricing not available
Chat with Claude Fable 5.1Go to model
Chat with Grok 4.1 FastGo to model
Frequently Asked Questions: Claude Fable 5.1 vs Grok 4.1 Fast▼

Which is better, Claude Fable 5.1 or Grok 4.1 Fast?

▼

Both Claude Fable 5.1 and Grok 4.1 Fast 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 has a larger context window, Claude Fable 5.1 or Grok 4.1 Fast?

▼

Grok 4.1 Fast has a larger context window: Claude Fable 5.1 supports 1M tokens vs Grok 4.1 Fast at 2M tokens.

Do both Claude Fable 5.1 and Grok 4.1 Fast support vision?

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Yes, both Claude Fable 5.1 and Grok 4.1 Fast support vision/image input.

What are the key differences between Claude Fable 5.1 and Grok 4.1 Fast?

▼

Key differences: 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 Claude Fable 5.1 and Grok 4.1 Fast for free on idapt.app to see which performs better for your specific needs.

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