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Anthropic

Claude Fable 5

VS
OpenAI

GPT-5.4 Pro

✍️ Analysis by:the whichllmmodel Editorial Team|📅 Updated: June 2026

Decision Recommendation

⚖️ Editorial Verdict: In our analysis, Claude Fable 5 is the premium intelligence choice, scoring 80.3% higher on coding benchmarks. However, this accuracy premium comes with a cost overhead: GPT-5.4 Pro is 145.5x cheaper to run and delivers 2.3x faster throughput. If you are building high-volume, simple chatbots or processing massive amounts of text where budget is critical, GPT-5.4 Pro offers excellent cost savings. For agentic reasoning, code refactoring, or complex logical tasks, the accuracy premium of Claude Fable 5 fully justifies the cost.

Model Specs

Claude Fable 5

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+)
80.3%
Reasoning (gpqa-diamond)Winner (+26.5%)
94.1%

Cost & Performance

Cost (per 1M tokens)
$20.00Input: $10.00 | Output: $50.00
Speed
60.3 tps
Context WindowLarger
1M tokens
Model Specs

GPT-5.4 Pro

Benchmarks & Scores

Coding (swe-bench-pro)
N/A
Reasoning (gpqa-diamond)
67.6%

Cost & Performance

Cost (per 1M tokens)145.5x cheaper
$0.14Input: $0.05 | Output: $0.40
Speed2.3x faster
137 tps
Context Window
400k tokens
Read our data collection methodology

Frequently Asked Questions

GPT-5.4 Pro is cheaper than Claude Fable 5. GPT-5.4 Pro has a blended cost of $0.14/1M tokens, which is about 145.5x cheaper than Claude Fable 5 at $20.00/1M tokens.

GPT-5.4 Pro is faster than Claude Fable 5. GPT-5.4 Pro generates 137 tokens per second (tps) compared to Claude Fable 5 which generates 60.3 tokens per second.

Claude Fable 5 is better for coding tasks. It scores 80.3% on coding evaluations (swe-bench-pro) compared to GPT-5.4 Pro which scores N/A.

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