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Claude Fable 5.1 vs Nova Premier

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

Amazon's most capable multimodal model for complex reasoning tasks.

1M ctx$2.50/$12.50 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
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper75%
Specs
1M
Context
128K
Max output
Sep 2026
Released
1M
Context
32K
Max output
Oct 2025
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 read60%$0.25/M tokens
Cache write$12.50/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input75%$2.50/M tokens
Output75%$12.50/M tokens
Cache read$0.63/M tokens
Chat with Claude Fable 5.1Go to model
Chat with Nova PremierGo to model
Frequently Asked Questions: Claude Fable 5.1 vs Nova Premier▼

Which is better, Claude Fable 5.1 or Nova Premier?

▼

Both Claude Fable 5.1 and Nova Premier 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 Nova Premier?

▼

Nova Premier has a lower blended cost. Claude Fable 5.1: $10.00 input / $50.00 output. Nova Premier: $2.50 input / $12.50 output.

Which has a larger context window, Claude Fable 5.1 or Nova Premier?

▼

Claude Fable 5.1 has a larger context window: Claude Fable 5.1 supports 1M tokens vs Nova Premier at 1M tokens.

Do both Claude Fable 5.1 and Nova Premier support vision?

▼

Yes, both Claude Fable 5.1 and Nova Premier support vision/image input.

What are the key differences between Claude Fable 5.1 and Nova Premier?

▼

Key differences: Nova Premier is significantly cheaper; 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 Nova Premier for free on idapt.app to see which performs better for your specific needs.

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