GPT-6 Luna vs Seed 1.6 Flash

Price, context window & benchmark comparison

OpenAI

GPT-6 Luna

OpenAI
$0.10 / $0.50
Input / Output · per 1M tokens
VS
ByteDance Seed

Seed 1.6 Flash

ByteDance Seed
$0.075 / $0.30
Input / Output · per 1M tokens
Compare different models
OpenAI
ByteDance Seed
Verdict: Seed 1.6 Flash is 34% cheaper than GPT-6 Luna on a typical 3:1 input/output mix. GPT-6 Luna has the larger context window (1.1M vs 262K).
GPT-6 LunaSeed 1.6 Flash
Input price / 1M$0.10$0.075
Output price / 1M$0.50$0.30
Blended price (3:1)$0.20$0.13
Cached input / 1M$0.01
Context window1.1M262K
Max output128K33K
Intelligence index37.3
Coding index
Providers7
Best provider uptime (30m)100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-09-222025-12-23
Retirement2026-11-11

Cost calculator

FAQ

Which is cheaper, GPT-6 Luna or Seed 1.6 Flash?

Seed 1.6 Flash is 34% cheaper than GPT-6 Luna on a typical 3:1 input/output mix.

GPT-6 Luna vs Seed 1.6 Flash: which has a bigger context window?

GPT-6 Luna: 1,050,000 tokens. Seed 1.6 Flash: 262,144 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: GPT-6 Luna ≈ $450.00, Seed 1.6 Flash ≈ $300.00.

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