LLM Comparison

GPT-5.5 vs Seed 1.6 Flash

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

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2/6 models

Same tier:

	GPT-5.5	Seed 1.6 Flash
Organization	OpenAI	ByteDance
OpenTools Score	90 5.1
Family	GPT	Seed
Status	Current	Current
Release Date	Apr 2026	Dec 2025
Context Window	1.1M tokens	262K tokens
Input Price	$5.00/M tokens	$0.07/M tokens
Output Price	$30.00/M tokens	$0.30/M tokens
Pricing Notes	Cached input: $0.50/M tokens. Long context (>272K tokens): 2x input, 1.5x output. Batch API: 50% discount. Priority: 2.5x standard.	—
Capabilities	textvisioncodetool-useextended-thinkingcomputer-useweb-search	textvisionvideocode
Training Cutoff	December 2025	—
Max Output	128K tokens	33K tokens
API Identifier	`openai/gpt-5.5`	`bytedance-seed/seed-1.6-flash`
Benchmarks
MMLU	92.4openai	—
GPQA Diamond	93.6openai	—
ARC-AGI-2	85openai	—
Terminal-Bench 2.0	82.7openai	—
SWE-bench Pro	58.6openai	—
OSWorld-Verified	78.7openai	—
BrowseComp	84.4openai	—
MMMU-Pro	81.2openai	—
FrontierMath Tier 4	35.4openai	—
HLE (with tools)	52.2openai	—
GDPval	84.9openai	—
Toolathlon	55.6openai	—
CyberGym	81.8openai	—
MRCR v2 512K-1M	74openai	—
	View GPT-5.5	View Seed 1.6 Flash

Cost Calculator

Enter your expected monthly token usage to compare costs.

Input tokens / month

Output tokens / month

Model	Input	Output	Total / mo	vs Best
Seed 1.6 FlashCheapest	$0.08	$0.15	$0.22	—
GPT-5.5	$5.00	$15.00	$20.00	+8789%

OpenAI

GPT-5.5

GPT-5.5 is OpenAI's smartest and most intuitive model, built for agentic work like coding, research, and data analysis. It matches GPT-5.4 per-token latency while delivering higher intelligence with significantly fewer tokens. Supports a 1,050,000 token context window and five reasoning effort levels (none through xhigh).

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.