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Claude Fable 5.1 vs GPT 4.1

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

OpenAI's flagship GPT-4.1 with advanced instruction following and long context.

701.0M ctx$2.00/$8.00 per M#55/92
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—Expert-Level—
Math
Math Problems—Competition Math—Research Math—
Coding
Real-World Coding—Code Editing—
Agentic
Novel Reasoning—
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper83%
Capability
CapabilityECI70.4
Reasoning & Knowledge
Graduate Science66.9%Expert-Level5.4%
Math
Math Problems83.0%Competition Math38.3%Research Math5.5%
Coding
Real-World Coding48.5%Code Editing52.4%
Agentic
Novel Reasoning0.4%
Specs
1M
Context
128K
Max output
Sep 2026
Released
1.0M
Context
33K
Max output
Apr 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 read50%$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
Output84%$8.00/M tokens
Cache read$0.50/M tokens
Web search$0.01/search
Chat with Claude Fable 5.1Go to model
Chat with GPT 4.1Go to model
Frequently Asked Questions: Claude Fable 5.1 vs GPT 4.1▼

Which is better, Claude Fable 5.1 or GPT 4.1?

▼

Both Claude Fable 5.1 and GPT 4.1 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 GPT 4.1?

▼

GPT 4.1 has a lower blended cost. Claude Fable 5.1: $10.00 input / $50.00 output. GPT 4.1: $2.00 input / $8.00 output.

Which has a larger context window, Claude Fable 5.1 or GPT 4.1?

▼

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

Do both Claude Fable 5.1 and GPT 4.1 support vision?

▼

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

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

▼

Key differences: GPT 4.1 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 GPT 4.1 for free on idapt.app to see which performs better for your specific needs.

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