LLM Comparison

Claude Opus 4.6 (Fast) vs GPT-5.4

Side-by-side specs, pricing & capabilities · Updated April 2026

Add to comparison

2/6 models

Same tier:

	Claude Opus 4.6 (Fast)	GPT-5.4
Organization	Anthropic	OpenAI
OpenTools Score	73 0.8
Family	Claude	GPT
Status	Current	Current
Release Date	Apr 2026	Mar 2026
Context Window	1.0M tokens	1.1M tokens
Input Price	$30.00/M tokens	$2.50/M tokens
Output Price	$150.00/M tokens	$15.00/M tokens
Pricing Notes	Cache read: $3.0000/M tokens	Cache read: $0.2500/M tokens
Capabilities	textvisioncodetool-use	textvisioncode
Max Output	128K tokens	128K tokens
API Identifier	`anthropic/claude-opus-4.6-fast`	`openai/gpt-5.4`
Benchmarks
MMLU	89.8	—
HumanEval	91.5	—
MATH	84.9	—
GPQA	72.4	—
	View Claude Opus 4.6 (Fast)	View GPT-5.4

Cost Calculator

Enter your expected monthly token usage to compare costs.

Input tokens / month

Output tokens / month

Model	Input	Output	Total / mo	vs Best
GPT-5.4Cheapest	$2.50	$7.50	$10.00	—
Claude Opus 4.6 (Fast)	$30.00	$75.00	$105.00	+950%

Anthropic

Claude Opus 4.6 (Fast)

Claude Opus 4.6 (Fast) is a multimodal llm from Anthropic. Supports up to 1,000,000 token context window. Achieves 89.8% on MMLU. Available from $30.00/M input tokens.

OpenAI

GPT-5.4

GPT-5.4 is a multimodal llm from OpenAI. Supports up to 1,050,000 token context window. Available from $2.50/M input tokens.