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Claude Fable 5.1 vs Grok Build 0.1

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

xAI's agentic build model for autonomous software engineering.

256K ctx$1.00/$2.00 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
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Coding
Real-World Coding—
Reasoning
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Provider·OpenRouter· as of 2026-06-15
Cheaper94%
Coding
Real-World Coding70.8%
Specs
1M
Context
128K
Max output
Sep 2026
Released
256K
Context
16K
Max output
May 2026
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
Live pricing, shown before you run
Input90%$1.00/M tokens
Output96%$2.00/M tokens
Cache read20%$0.20/M tokens
Web search50%$0.005/search
Chat with Claude Fable 5.1Go to model
Chat with Grok Build 0.1Go to model
Frequently Asked Questions: Claude Fable 5.1 vs Grok Build 0.1▼

Which is better, Claude Fable 5.1 or Grok Build 0.1?

▼

Both Claude Fable 5.1 and Grok Build 0.1 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, Claude Fable 5.1 or Grok Build 0.1?

▼

Grok Build 0.1 has a lower blended cost. Claude Fable 5.1: $10.00 input / $50.00 output. Grok Build 0.1: $1.00 input / $2.00 output.

Which has a larger context window, Claude Fable 5.1 or Grok Build 0.1?

▼

Claude Fable 5.1 has a larger context window: Claude Fable 5.1 supports 1M tokens vs Grok Build 0.1 at 256K tokens.

Do both Claude Fable 5.1 and Grok Build 0.1 support vision?

▼

Yes, both Claude Fable 5.1 and Grok Build 0.1 support vision/image input.

What are the key differences between Claude Fable 5.1 and Grok Build 0.1?

▼

Key differences: Grok Build 0.1 is significantly cheaper. 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 Build 0.1 for free on idapt.app to see which performs better for your specific needs.

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