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GPT-6 Luna vs Seed 2.0 Pro

GPT-6 Luna and Seed 2.0 Pro are closely matched at 44.3 and 39.5 on the LLM Stats Score. GPT-6 Luna is 5.6x cheaper per token.

OpenAI · ByteDance · Updated for 2026

Which is better?

GPT-6 Luna and Seed 2.0 Pro are closely matched on the overall LLM Stats Score at 44.3 and 39.5.

On price, GPT-6 Luna is roughly 5.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-6 Luna also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose GPT-6 Luna

  • cost matters — it's about 5.6x cheaper per token
  • you process long inputs — it offers a 1,050,000 token context window
  • you want the most recent training data — it shipped Sep 2026

Choose Seed 2.0 Pro

  • you want predictable pricing at $0.50/M input and $3.00/M output

At a glance

The differences that matter most.

GPT-6 Luna
OpenAI
Seed 2.0 Pro
ByteDance
Core performance indexes
LLM Stats Score
44.3
#42
39.5
#63
Reasoning
39.8
#61
39.0
#64
Coding
31.1
#49
22.0
#90
Agents
31.5
#33
16.8
#85
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.10 / M
$0.50 / M
Output price
$0.50 / M
$3.00 / M
Context window
1,050,000
256,000

Individual benchmarks

5 reported for GPT-6 Luna · 6 for Seed 2.0 Pro

No common benchmarks found

GPT-6 Luna and Seed 2.0 Prodon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

GPT-6 Luna costs less

For input processing, GPT-6 Luna ($0.10/1M tokens) is 5.0x cheaper than Seed 2.0 Pro ($0.50/1M tokens).

For output processing, GPT-6 Luna ($0.50/1M tokens) is 6.0x cheaper than Seed 2.0 Pro ($3.00/1M tokens).

In conclusion, Seed 2.0 Pro is more expensive than GPT-6 Luna.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Fri Oct 02 2026 • llm-stats.com
OpenAI
GPT-6 Luna
Input tokens$0.10
Output tokens$0.50
Best providerOpenAI
ByteDance
Seed 2.0 Pro
Input tokens$0.50
Output tokens$3.00
Best providerDeepinfra
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

GPT-6 Luna accepts 1,050,000 input tokens compared to Seed 2.0 Pro's 256,000 tokens. Seed 2.0 Pro can generate longer responses up to 131,072 tokens, while GPT-6 Luna is limited to 128,000 tokens.

OpenAI
GPT-6 Luna
Input1,050,000 tokens
Output128,000 tokens
ByteDance
Seed 2.0 Pro
Input256,000 tokens
Output131,072 tokens
Fri Oct 02 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both GPT-6 Luna and Seed 2.0 Pro support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

GPT-6 Luna

Text
Images
Audio
Video

Seed 2.0 Pro

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

GPT-6 Luna

Proprietary

Closed source

Seed 2.0 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-6 Luna was released on 2026-09-22, while Seed 2.0 Pro was released on 2026-02-14.

GPT-6 Luna is 7 months newer than Seed 2.0 Pro.

GPT-6 Luna

Sep 22, 2026

1 weeks ago

7mo newer
Seed 2.0 Pro

Feb 14, 2026

7 months ago

Knowledge Cutoff

When training data ends

GPT-6 Luna has a knowledge cutoff of 2026-05-18, while Seed 2.0 Pro has a cutoff of 2024-01-01.

GPT-6 Luna has more recent training data (up to 2026-05-18), making it potentially better informed about events through that date compared to Seed 2.0 Pro (2024-01-01).

GPT-6 Luna

May 2026

2.3 yr newer
Seed 2.0 Pro

Jan 2024

Provider Availability

GPT-6 Luna is available from OpenAI. Seed 2.0 Pro is available from DeepInfra.

GPT-6 Luna

openai logo
OpenAI
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M

Seed 2.0 Pro

deepinfra logo
Deepinfra
Input Price:Input: $0.50/1MOutput Price:Output: $3.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against GPT-6 Luna and Seed 2.0 Pro side-by-side, then vote on the output you prefer.

GPT-6 Luna
✓ Preferred
Seed 2.0 Pro
Open in Playground

FAQ

Common questions about GPT-6 Luna vs Seed 2.0 Pro.

Which is better, GPT-6 Luna or Seed 2.0 Pro?

GPT-6 Luna and Seed 2.0 Pro are closely matched on the LLM Stats Score at 44.3 and 39.5. GPT-6 Luna is made by OpenAI and Seed 2.0 Pro is made by ByteDance. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does GPT-6 Luna compare to Seed 2.0 Pro in benchmarks?

GPT-6 Luna scores DeepSWE 1.1: 66.6%, OSWorld 2.0: 52.7%, Agents' Last Exam: 50.9%, FrontierCode 1.1: 42.4%, AutomationBench v1.0.6: 20.7%. Seed 2.0 Pro scores AIME 2025: 98.3%, AIME 2026: 94.2%, GPQA: 88.9%, LiveCodeBench v6: 87.8%, BrowseComp: 77.3%.

Is GPT-6 Luna cheaper than Seed 2.0 Pro?

GPT-6 Luna is 5.0x cheaper for input tokens. GPT-6 Luna costs $0.10/M input and $0.50/M output via openai. Seed 2.0 Pro costs $0.50/M input and $3.00/M output via deepinfra.

What are the context window sizes for GPT-6 Luna and Seed 2.0 Pro?

GPT-6 Luna supports 1.1M tokens and Seed 2.0 Pro supports 256K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-6 Luna and Seed 2.0 Pro?

Key differences include LLM Stats Score (44.3 vs 39.5), context window (1.1M vs 256K), input pricing ($0.10 vs $0.50/M). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-6 Luna and Seed 2.0 Pro?

GPT-6 Luna is developed by OpenAI and Seed 2.0 Pro is developed by ByteDance.

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