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GPT 5.4 vs Claude Fable 5

At a glance

OpenAI's latest frontier model, unifying the Codex and GPT lines into one system.

871.1M ctx$2.50/$15.00 per M#7/92

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
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper72%
Capability
CapabilityECI87.4
Reasoning & Knowledge
Graduate Science93.3%Expert-Level36.2%Factual Recall44.8%
Math
Competition Math95.3%Research Math47.6%
Coding
Real-World Coding76.9%
Agentic
Novel Reasoning74.0%Task Horizon5.7h
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter5%
Capability
CapabilityECI5%91.6
Reasoning & Knowledge
Graduate Science—Expert-Level—Factual Recall52%68.3%
Math
Competition Math5%99.7%Research Math—
Coding
Real-World Coding—
Agentic
Novel Reasoning—Task Horizon—
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
Input75%$2.50/M tokens
Output70%$15.00/M tokens
Cache read75%$0.25/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 5.4Go to model
Chat with Claude Fable 5Go to model
Frequently Asked Questions: GPT 5.4 vs Claude Fable 5▼

Which is better, GPT 5.4 or Claude Fable 5?

▼

Based on the Capability Index, Claude Fable 5 scores higher (91.6 vs 87.4). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, GPT 5.4 or Claude Fable 5?

▼

GPT 5.4 has a lower blended cost. GPT 5.4: $2.50 input / $15.00 output. Claude Fable 5: $10.00 input / $50.00 output.

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

▼

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

Do both GPT 5.4 and Claude Fable 5 support vision?

▼

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

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

▼

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

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