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Claude Fable 5 vs GPT 4o

At a glance

Anthropic's Mythos-class flagship for ambitious, long-running professional work.

921M ctx$10.00/$50.00 per M#2/92

OpenAI's original omni model supporting text and image inputs.

63128K ctx$2.50/$10.00 per M#64/92
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
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter45%
Capability
CapabilityECI45%91.6
Reasoning & Knowledge
Graduate Science—Expert-Level—Factual Recall68.3%
Math
Math Problems—Competition Math1461%99.7%Research Math—
Coding
Real-World Coding—Code Editing—
Agentic
Task Horizon—
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper78%
Capability
CapabilityECI63.0
Reasoning & Knowledge
Graduate Science49.2%Expert-Level2.7%Factual Recall—
Math
Math Problems53.3%Competition Math6.4%Research Math0.3%
Coding
Real-World Coding31.0%Code Editing23.1%
Agentic
Task Horizon9min
Specs
1M
Context
128K
Max output
Jun 2026
Released
128K
Context
16K
Max output
May 2024
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 read20%$1.00/M tokens
Cache write$12.50/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input75%$2.50/M tokens
Output80%$10.00/M tokens
Cache read$1.25/M tokens
Chat with Claude Fable 5Go to model
Chat with GPT 4oGo to model
Frequently Asked Questions: Claude Fable 5 vs GPT 4o▼

Which is better, Claude Fable 5 or GPT 4o?

▼

Based on the Capability Index, Claude Fable 5 scores higher (91.6 vs 63.0). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, Claude Fable 5 or GPT 4o?

▼

GPT 4o has a lower blended cost. Claude Fable 5: $10.00 input / $50.00 output. GPT 4o: $2.50 input / $10.00 output.

Which has a larger context window, Claude Fable 5 or GPT 4o?

▼

Claude Fable 5 has a larger context window: Claude Fable 5 supports 1M tokens vs GPT 4o at 128K tokens.

Do both Claude Fable 5 and GPT 4o support vision?

▼

Yes, both Claude Fable 5 and GPT 4o support vision/image input.

What are the key differences between Claude Fable 5 and GPT 4o?

▼

Key differences: Claude Fable 5 has a notably higher capability index (28.6 point gap); GPT 4o is significantly cheaper; only Claude Fable 5 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 and GPT 4o for free on idapt.app to see which performs better for your specific needs.

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