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GPT 5.4 Mini vs Claude Fable 5

At a glance

GPT-5.4 distilled into a fast, cost-efficient model for high-throughput workloads.

81400K ctx$0.75/$4.50 per M#24/92

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

921M ctx$10.00/$50.00 per M#2/92
Agent Demos
All agent demos

No shared agent 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
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper92%
Capability
CapabilityECI80.8
Reasoning & Knowledge
Graduate Science83.6%Factual Recall28.6%
Math
Competition Math87.2%Research Math28.3%
Agentic
Novel Reasoning18.9%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter13%
Capability
CapabilityECI13%91.6
Reasoning & Knowledge
Graduate Science—Factual Recall139%68.3%
Math
Competition Math14%99.7%Research Math—
Agentic
Novel Reasoning—
Specs
400K
Context
128K
Max output
Mar 2026
Released
1M
Context
128K
Max output
Jun 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input93%$0.75/M tokens
Output91%$4.50/M tokens
Cache read93%$0.07/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 5.4 MiniGo to model
Chat with Claude Fable 5Go to model
Frequently Asked Questions: GPT 5.4 Mini vs Claude Fable 5▼

Which is better, GPT 5.4 Mini or Claude Fable 5?

▼

Based on the Capability Index, Claude Fable 5 scores higher (91.6 vs 80.8). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, GPT 5.4 Mini or Claude Fable 5?

▼

GPT 5.4 Mini has a lower blended cost. GPT 5.4 Mini: $0.75 input / $4.50 output. Claude Fable 5: $10.00 input / $50.00 output.

Which has a larger context window, GPT 5.4 Mini or Claude Fable 5?

▼

Claude Fable 5 has a larger context window: GPT 5.4 Mini supports 400K tokens vs Claude Fable 5 at 1M tokens.

Do both GPT 5.4 Mini and Claude Fable 5 support vision?

▼

Yes, both GPT 5.4 Mini and Claude Fable 5 support vision/image input.

What are the key differences between GPT 5.4 Mini and Claude Fable 5?

▼

Key differences: Claude Fable 5 has a notably higher capability index (10.8 point gap); GPT 5.4 Mini 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 5.4 Mini and Claude Fable 5 for free on idapt.app to see which performs better for your specific needs.

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