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Anthropic

Claude Fable 5

VS
OpenAI

GPT-5.4 mini

✍️ 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 25.9% higher on coding benchmarks. However, this accuracy premium comes with a cost overhead: GPT-5.4 mini is 11.9x cheaper to run and delivers 3.3x faster throughput. If you are building high-volume, simple chatbots or processing massive amounts of text where budget is critical, GPT-5.4 mini 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 (+25.9%)
80.3%
Reasoning (gpqa-diamond)Winner (+6.6%)
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 mini

Benchmarks & Scores

Coding (swe-bench-pro)
54.4%
Reasoning (gpqa-diamond)
87.5%

Cost & Performance

Cost (per 1M tokens)11.9x cheaper
$1.69Input: $0.75 | Output: $4.50
Speed3.3x faster
201 tps
Context Window
400k tokens
Read our data collection methodology

Frequently Asked Questions

GPT-5.4 mini is cheaper than Claude Fable 5. GPT-5.4 mini has a blended cost of $1.69/1M tokens, which is about 11.9x cheaper than Claude Fable 5 at $20.00/1M tokens.

GPT-5.4 mini is faster than Claude Fable 5. GPT-5.4 mini generates 201 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 mini which scores 54.4%.

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