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GPT 5.4 Pro vs Claude Fable 5

At a glance

OpenAI's most advanced reasoning model, built on GPT 5.4's unified architecture.

891.1M ctx$30.00/$180.00 per M#5/92

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
AgenticInsufficient data
MathInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Capability
CapabilityECI89.1
Reasoning & Knowledge
Graduate Science94.6%Factual Recall47.8%
Math
Competition Math—Research Math50.0%
Agentic
Novel Reasoning83.3%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter3%Cheaper70%
Capability
CapabilityECI3%91.6
Reasoning & Knowledge
Graduate Science—Factual Recall43%68.3%
Math
Competition Math99.7%Research Math—
Agentic
Novel Reasoning—
Specs
1.1M
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
Input$30.00/M tokens
Output$180.00/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input67%$10.00/M tokens
Output72%$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 ProGo to model
Chat with Claude Fable 5Go to model
Frequently Asked Questions: GPT 5.4 Pro vs Claude Fable 5▼

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

▼

Based on the Capability Index, Claude Fable 5 scores higher (91.6 vs 89.1). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

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

▼

Claude Fable 5 has a lower blended cost. GPT 5.4 Pro: $30.00 input / $180.00 output. Claude Fable 5: $10.00 input / $50.00 output.

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

▼

GPT 5.4 Pro has a larger context window: GPT 5.4 Pro supports 1.1M tokens vs Claude Fable 5 at 1M tokens.

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

▼

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

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

▼

Key differences: Claude Fable 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 GPT 5.4 Pro and Claude Fable 5 for free on idapt.app to see which performs better for your specific needs.

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