LLM Comparison

Claude Opus 4.6 (Fast) vs Seed 1.6 Flash

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

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2/6 models

Same tier:

	Claude Opus 4.6 (Fast)	S Seed 1.6 Flash
Organization	Anthropic	ByteDance
OpenTools Score	73 0.8
Family	Claude	Seed
Status	Current	Current
Release Date	Apr 2026	Dec 2025
Context Window	1.0M tokens	262K tokens
Input Price	$30.00/M tokens	$0.07/M tokens
Output Price	$150.00/M tokens	$0.30/M tokens
Pricing Notes	Cache read: $3.0000/M tokens	—
Capabilities	textvisioncodetool-use	textvisionvideocode
Max Output	128K tokens	33K tokens
API Identifier	`anthropic/claude-opus-4.6-fast`	`bytedance-seed/seed-1.6-flash`
Benchmarks
MMLU	89.8	—
HumanEval	91.5	—
MATH	84.9	—
GPQA	72.4	—
	View Claude Opus 4.6 (Fast)	View Seed 1.6 Flash

Cost Calculator

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Input tokens / month

Output tokens / month

Model	Input	Output	Total / mo	vs Best
Seed 1.6 FlashCheapest	$0.08	$0.15	$0.22	—
Claude Opus 4.6 (Fast)	$30.00	$75.00	$105.00	+46567%

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.

ByteDance

Seed 1.6 Flash

Seed 1.6 Flash is a multimodal llm from ByteDance. Supports up to 262,144 token context window. Available from $0.07/M input tokens.