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GPT 5 Nano vs Claude Fable 5

At a glance

Ultra-fast and lightweight GPT-5 variant for low-latency tasks.

73400K ctx$0.05/$0.40 per M#48/92

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

921M ctx$10.00/$50.00 per M#2/92
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
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper99%
Capability
CapabilityECI73.4
Reasoning & Knowledge
Graduate Science69.4%Factual Recall12.2%
Math
Math Problems95.2%Competition Math81.1%Research Math8.3%
Agentic
Terminal Tasks11.5%Novel Reasoning2.6%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter25%
Capability
CapabilityECI25%91.6
Reasoning & Knowledge
Graduate Science—Factual Recall460%68.3%
Math
Math Problems—Competition Math23%99.7%Research Math—
Agentic
Terminal Tasks—Novel Reasoning—
Specs
400K
Context
128K
Max output
Aug 2025
Released
1M
Context
128K
Max output
Jun 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input99%$0.05/M tokens
Output99%$0.40/M tokens
Cache read100%$0.005/M tokens
Web search$0.01/search
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
Chat with GPT 5 NanoGo to model
Chat with Claude Fable 5Go to model
Frequently Asked Questions: GPT 5 Nano vs Claude Fable 5▼

Which is better, GPT 5 Nano or Claude Fable 5?

▼

Based on the Capability Index, Claude Fable 5 scores higher (91.6 vs 73.4). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, GPT 5 Nano or Claude Fable 5?

▼

GPT 5 Nano has a lower blended cost. GPT 5 Nano: $0.05 input / $0.40 output. Claude Fable 5: $10.00 input / $50.00 output.

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

▼

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

Do both GPT 5 Nano and Claude Fable 5 support vision?

▼

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

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

▼

Key differences: Claude Fable 5 has a notably higher capability index (18.2 point gap); GPT 5 Nano 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 GPT 5 Nano and Claude Fable 5 for free on idapt.app to see which performs better for your specific needs.

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