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Claude Fable 5 vs GPT 5

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 powerful general-purpose frontier model.

82400K ctx$1.25/$10.00 per M#20/92
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
Smarter12%
Capability
CapabilityECI12%91.6
Reasoning & Knowledge
Graduate Science—Expert-Level—Factual Recall35%68.3%
Math
Math Problems—Competition Math9%99.7%Research Math—
Coding
Real-World Coding—Code Editing—
Agentic
Terminal Tasks—Novel Reasoning—Task Horizon—
Reasoning
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper83%
Capability
CapabilityECI81.8
Reasoning & Knowledge
Graduate Science86.2%Expert-Level25.3%Factual Recall50.6%
Math
Math Problems98.1%Competition Math91.4%Research Math32.4%
Coding
Real-World Coding73.6%Code Editing88.0%
Agentic
Terminal Tasks49.6%Novel Reasoning9.9%Task Horizon3.4h
Specs
1M
Context
128K
Max output
Jun 2026
Released
400K
Context
128K
Max output
Aug 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 read$1.00/M tokens
Cache write$12.50/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input88%$1.25/M tokens
Output80%$10.00/M tokens
Cache read88%$0.13/M tokens
Web search$0.01/search
Chat with Claude Fable 5Go to model
Chat with GPT 5Go to model
Frequently Asked Questions: Claude Fable 5 vs GPT 5▼

Which is better, Claude Fable 5 or GPT 5?

▼

Based on the Capability Index, Claude Fable 5 scores higher (91.6 vs 81.8). 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 5?

▼

GPT 5 has a lower blended cost. Claude Fable 5: $10.00 input / $50.00 output. GPT 5: $1.25 input / $10.00 output.

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

▼

Claude Fable 5 has a larger context window: Claude Fable 5 supports 1M tokens vs GPT 5 at 400K tokens.

Do both Claude Fable 5 and GPT 5 support vision?

▼

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

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

▼

Key differences: Claude Fable 5 has a notably higher capability index (9.8 point gap); GPT 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 and GPT 5 for free on idapt.app to see which performs better for your specific needs.

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