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Claude Fable 5.1 vs Grok 4.5

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 Opus-class flagship for frontier coding, agentic tool use, and knowledge work.

89500K ctx$2.00/$6.00 per M#6/92
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
Capability
Capability—
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—
Agentic
Terminal Tasks—
Reasoning
CI 86.2-90.3
CodingInsufficient data
Sources:Epoch ECI·Epoch AI·Provider·OpenRouter· as of 2026-07-10
Cheaper85%
Capability
CapabilityECI88.5
Reasoning & Knowledge
Graduate Science93.4%Factual Recall53.5%
Math
Competition Math97.8%
Agentic
Terminal Tasks83.3%
Specs
1M
Context
128K
Max output
Sep 2026
Released
500K
Context
16K
Max output
Jul 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 read17%$0.25/M tokens
Cache write$12.50/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input80%$2.00/M tokens
Output88%$6.00/M tokens
Cache read$0.30/M tokens
Web search50%$0.005/search
Chat with Claude Fable 5.1Go to model
Chat with Grok 4.5Go to model
Frequently Asked Questions: Claude Fable 5.1 vs Grok 4.5▼

Which is better, Claude Fable 5.1 or Grok 4.5?

▼

Both Claude Fable 5.1 and Grok 4.5 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 4.5?

▼

Grok 4.5 has a lower blended cost. Claude Fable 5.1: $10.00 input / $50.00 output. Grok 4.5: $2.00 input / $6.00 output.

Which has a larger context window, Claude Fable 5.1 or Grok 4.5?

▼

Claude Fable 5.1 has a larger context window: Claude Fable 5.1 supports 1M tokens vs Grok 4.5 at 500K tokens.

Do both Claude Fable 5.1 and Grok 4.5 support vision?

▼

Yes, both Claude Fable 5.1 and Grok 4.5 support vision/image input.

What are the key differences between Claude Fable 5.1 and Grok 4.5?

▼

Key differences: Grok 4.5 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 4.5 for free on idapt.app to see which performs better for your specific needs.

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