LIVE INTELLIGENCE · part of the Xentir AI Index

Claude Sonnet 4.5 vs GPT-5.4 Nano

Name: Claude Sonnet 4.5 vs GPT-5.4 Nano — benchmark results
Creator: Epoch AI
License: https://creativecommons.org/licenses/by/4.0/

Claude Sonnet 4.5 · Anthropic, released 2025-09-29
GPT-5.4 Nano · OpenAI, released 2026-03-17

“Epoch AI, 'AI Benchmarking Hub'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks' [online resource].” · epoch.ai/benchmarks · Licensed CC BY 4.0 · data last verified 2026-09-09 · Methodology · Data Sources

GPT-5.4 Nano leads on more of the 7 benchmarks where both are measured — Claude Sonnet 4.5 on 3, GPT-5.4 Nano on 4. The remaining 2 of 9 tracked benchmarks cannot be compared: 2 have a result for only one of the two models, 0 for neither. Nothing on this page is estimated to fill those in.

Head-to-head

Measured on 7 of 9 tracked benchmarks for both models — Claude Sonnet 4.5 leads on 3, GPT-5.4 Nano leads on 4.

Benchmark	Claude Sonnet 4.5	GPT-5.4 Nano	Leads
Epoch Capabilities Index (ECI)	146.8	145.9	Claude Sonnet 4.5
SWE-bench Verified	0.713	Not measured	Comparison unavailable — GPT-5.4 Nano has no published result
GPQA Diamond	0.823 (59k)	0.785 (high)	Claude Sonnet 4.5
MATH Level 5	0.977 (32k)	Not measured	Comparison unavailable — GPT-5.4 Nano has no published result
OTIS Mock AIME 2024-2025	0.778 (59k)	0.878 (high)	GPT-5.4 Nano
FrontierMath	0.152 (32k)	0.259 (high)	GPT-5.4 Nano
FrontierMath Tier 4	0.042 (32k)	0.062 (high)	GPT-5.4 Nano
SimpleQA Verified	0.307 (59k)	0.117 (high)	Claude Sonnet 4.5
Chess Puzzles	0.120 (32k)	0.300 (high)	GPT-5.4 Nano

Benchmark results measure specific tasks and should not be treated as a universal measure of model quality. A model with no row here for a benchmark has not been measured on it — that is left blank, never estimated.

What remains uncertain

GPT-5.4 Nano has no published result on MATH Level 5, SWE-bench Verified.

A missing result means Xentir has not found one published by the source it cites, not that the model performs badly. See Data Sources.

Reference price

Per 1M tokens	Claude Sonnet 4.5	GPT-5.4 Nano
Output	$15.00 stale	$1.25

List price as published by the vendor. Xentir does not verify negotiated or enterprise rates, and price is not a measure of capability — see Data Sources.

Full profiles

Claude Sonnet 4.5 → · GPT-5.4 Nano → · the full AI Model Rankings table