GPT-5.6 Luna Pro vs Seed 2.1 Turbo

Price, context window & benchmark comparison

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GPT-5.6 Luna Pro

OpenAI
$0.20 / $1.20
Input / Output · per 1M tokens
VS
B

Seed 2.1 Turbo

ByteDance Seed
$0.50 / $2.50
Input / Output · per 1M tokens
Compare different models
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Verdict: GPT-5.6 Luna Pro is 2.2× cheaper than Seed 2.1 Turbo on a typical 3:1 input/output mix. GPT-5.6 Luna Pro has the larger context window (1.1M vs 262K).
GPT-5.6 Luna ProSeed 2.1 Turbo
Input price / 1M$0.20$0.50
Output price / 1M$1.20$2.50
Blended price (3:1)$0.45$1.00
Cached input / 1M$0.02—
Context window1.1M262K
Max output128K236K
Intelligence index——
Coding index——
Providers51
Best provider uptime (30m)100.0%100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-07-092026-08-12
Retirement——

Cost calculator

FAQ

Which is cheaper, GPT-5.6 Luna Pro or Seed 2.1 Turbo?

GPT-5.6 Luna Pro is 2.2× cheaper than Seed 2.1 Turbo on a typical 3:1 input/output mix.

GPT-5.6 Luna Pro vs Seed 2.1 Turbo: which has a bigger context window?

GPT-5.6 Luna Pro: 1,050,000 tokens. Seed 2.1 Turbo: 262,144 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: GPT-5.6 Luna Pro ≈ $1,000, Seed 2.1 Turbo ≈ $2,250.

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