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GPT-6 Astra vs Seed 2.1 Turbo

GPT-6 Astra leads the LLM Stats Score 59.6 to 43.2.

OpenAI · ByteDance · Updated for 2026

Which is better?

GPT-6 Astra leads the overall LLM Stats Score 59.6 to 43.2, ranking #1 overall.

In the 1 individual benchmarks reported for both models, GPT-6 Astra wins 1; this is a narrower head-to-head signal than the composite indexes.

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

Choose GPT-6 Astra

  • overall performance matters — it scores 59.6 and ranks #1 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Sep 2026

Choose Seed 2.1 Turbo

  • you are already invested in the ByteDance ecosystem

At a glance

The differences that matter most.

GPT-6 Astra
OpenAI
Seed 2.1 Turbo
ByteDance
Core performance indexes
LLM Stats Score
59.6
#1
43.2
#42
Reasoning
57.5
#1
44.5
#34
Coding
48.5
#1
31.0
#46
Agents
45.7
#1
29.1
#39
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
$10.00 / M
— / M
Output price
$50.00 / M
— / M
Context window
1,050,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

4 shared
Index
GPT-6 Astra
Seed 2.1 Turbo
Math
36.0#42
39.7#17
Vision
41.8#2
30.4#28
Tool use
35.6#1
21.4#51
Multimodal
39.0#2
33.5#16
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

22 reported for GPT-6 Astra · 90 for Seed 2.1 Turbo

1 shared

GPT-6 Astra outperforms in 1 benchmarks (BrowseComp), while Seed 2.1 Turbo is better at 0 benchmarks.

GPT-6 Astra significantly outperforms across most benchmarks.

Fri Sep 18 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only GPT-6 Astra specifies input context (1,050,000 tokens). Only GPT-6 Astra specifies output context (128,000 tokens).

OpenAI
GPT-6 Astra
Input1,050,000 tokens
Output128,000 tokens
ByteDance
Seed 2.1 Turbo
Input- tokens
Output- tokens
Fri Sep 18 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both GPT-6 Astra and Seed 2.1 Turbo support multimodal inputs.

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

GPT-6 Astra

Text
Images
Audio
Video

Seed 2.1 Turbo

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 Astra

Proprietary

Closed source

Seed 2.1 Turbo

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-6 Astra was released on 2026-09-04, while Seed 2.1 Turbo was released on 2026-06-24.

GPT-6 Astra is 2 months newer than Seed 2.1 Turbo.

GPT-6 Astra

Sep 4, 2026

1 weeks ago

2mo newer
Seed 2.1 Turbo

Jun 24, 2026

2 months ago

Knowledge Cutoff

When training data ends

GPT-6 Astra has a documented knowledge cutoff of 2026-04-30, while Seed 2.1 Turbo's cutoff date is not specified.

We can confirm GPT-6 Astra's training data extends to 2026-04-30, but cannot make a direct comparison without Seed 2.1 Turbo's cutoff date.

GPT-6 Astra

Apr 2026

Seed 2.1 Turbo

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GPT-6 Astra and Seed 2.1 Turbo side-by-side, then vote on the output you prefer.

GPT-6 Astra
✓ Preferred
Seed 2.1 Turbo
Open in Playground

FAQ

Common questions about GPT-6 Astra vs Seed 2.1 Turbo.

Which is better, GPT-6 Astra or Seed 2.1 Turbo?

GPT-6 Astra leads the LLM Stats Score 59.6 to 43.2. GPT-6 Astra is made by OpenAI and Seed 2.1 Turbo 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 Astra compare to Seed 2.1 Turbo in benchmarks?

GPT-6 Astra scores ExploitBench: 100.0%, ARC-AGI-3: 99.9%, ARC-AGI: 98.5%, FrontierMath Tier 4 (v2): 97.6%, GPQA: 96.0%. Seed 2.1 Turbo scores CharXiv-D: 94.6%, MathVision: 92.7%, MathVista: 90.5%, MathVerse: 89.2%, Video-MME: 89.0%.

What are the context window sizes for GPT-6 Astra and Seed 2.1 Turbo?

GPT-6 Astra supports 1.1M tokens and Seed 2.1 Turbo supports an unknown number of 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 Astra and Seed 2.1 Turbo?

Key differences include LLM Stats Score (59.6 vs 43.2). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-6 Astra and Seed 2.1 Turbo?

GPT-6 Astra is developed by OpenAI and Seed 2.1 Turbo is developed by ByteDance.

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