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GPT-6 Astra vs Nemotron 3 Ultra (550B A55B)

GPT-6 Astra leads the LLM Stats Score 59.6 to 36.3. Nemotron 3 Ultra (550B A55B) is 21.6x cheaper per token.

OpenAI · NVIDIA · Updated for 2026

Which is better?

GPT-6 Astra leads the overall LLM Stats Score 59.6 to 36.3, ranking #1 overall.

In the 2 individual benchmarks reported for both models, GPT-6 Astra wins 2; this is a narrower head-to-head signal than the composite indexes.

On price, Nemotron 3 Ultra (550B A55B) is roughly 21.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-6 Astra 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 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 2 of 2 exact shared results
  • 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 Nemotron 3 Ultra (550B A55B)

  • cost matters — it's about 21.6x cheaper per token
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

GPT-6 Astra
OpenAI
Nemotron 3 Ultra (550B A55B)
NVIDIA
Core performance indexes
LLM Stats Score
59.6
#1
36.3
#79
Reasoning
57.5
#1
35.4
#82
Coding
48.5
#1
21.0
#93
Agents
45.7
#1
12.5
#101
Cost, coverage & limits
Benchmark wins
2 of 2
0 of 2
Input price
$10.00 / M
$0.50 / M
Output price
$50.00 / M
$2.20 / M
Context window
1,050,000
262,144

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
GPT-6 Astra
Nemotron 3 Ultra (550B A55B)
Math
36.0#42
36.4#39
Tool use
35.6#1
2.8#166
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

22 reported for GPT-6 Astra · 26 for Nemotron 3 Ultra (550B A55B)

2 shared

GPT-6 Astra outperforms in 2 benchmarks (BrowseComp, GPQA), while Nemotron 3 Ultra (550B A55B) is better at 0 benchmarks.

GPT-6 Astra significantly outperforms across most benchmarks.

Sun Sep 20 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Nemotron 3 Ultra (550B A55B) costs less

For input processing, GPT-6 Astra ($10.00/1M tokens) is 20.0x more expensive than Nemotron 3 Ultra (550B A55B) ($0.50/1M tokens).

For output processing, GPT-6 Astra ($50.00/1M tokens) is 22.7x more expensive than Nemotron 3 Ultra (550B A55B) ($2.20/1M tokens).

In conclusion, GPT-6 Astra is more expensive than Nemotron 3 Ultra (550B A55B).*

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

Lowest available price from all providers
Sun Sep 20 2026 • llm-stats.com
OpenAI
GPT-6 Astra
Input tokens$10.00
Output tokens$50.00
Best providerOpenAI
NVIDIA
Nemotron 3 Ultra (550B A55B)
Input tokens$0.50
Output tokens$2.20
Best providerDeepinfra
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-6 Astra accepts 1,050,000 input tokens compared to Nemotron 3 Ultra (550B A55B)'s 262,144 tokens. Nemotron 3 Ultra (550B A55B) can generate longer responses up to 262,144 tokens, while GPT-6 Astra is limited to 128,000 tokens.

OpenAI
GPT-6 Astra
Input1,050,000 tokens
Output128,000 tokens
NVIDIA
Nemotron 3 Ultra (550B A55B)
Input262,144 tokens
Output262,144 tokens
Sun Sep 20 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

GPT-6 Astra supports multimodal inputs, whereas Nemotron 3 Ultra (550B A55B) does not.

GPT-6 Astra can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-6 Astra

Text
Images
Audio
Video

Nemotron 3 Ultra (550B A55B)

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-6 Astra is licensed under a proprietary license, while Nemotron 3 Ultra (550B A55B) uses OpenMDW License v1.1.

License differences may affect how you can use these models in commercial or open-source projects.

GPT-6 Astra

Proprietary

Closed source

Nemotron 3 Ultra (550B A55B)

OpenMDW License v1.1

Open weights

Release Timeline

When each model was launched

GPT-6 Astra was released on 2026-09-04, while Nemotron 3 Ultra (550B A55B) was released on 2026-06-04.

GPT-6 Astra is 3 months newer than Nemotron 3 Ultra (550B A55B).

GPT-6 Astra

Sep 4, 2026

2 weeks ago

3mo newer
Nemotron 3 Ultra (550B A55B)

Jun 4, 2026

3 months ago

Knowledge Cutoff

When training data ends

GPT-6 Astra has a knowledge cutoff of 2026-04-30, while Nemotron 3 Ultra (550B A55B) has a cutoff of 2025-09-30.

GPT-6 Astra has more recent training data (up to 2026-04-30), making it potentially better informed about events through that date compared to Nemotron 3 Ultra (550B A55B) (2025-09-30).

GPT-6 Astra

Apr 2026

7 mo newer
Nemotron 3 Ultra (550B A55B)

Sep 2025

Provider Availability

GPT-6 Astra is available from OpenAI. Nemotron 3 Ultra (550B A55B) is available from DeepInfra.

GPT-6 Astra

openai logo
OpenAI
Input Price:Input: $10.00/1MOutput Price:Output: $50.00/1M

Nemotron 3 Ultra (550B A55B)

deepinfra logo
Deepinfra
Input Price:Input: $0.50/1MOutput Price:Output: $2.20/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GPT-6 Astra and Nemotron 3 Ultra (550B A55B) side-by-side, then vote on the output you prefer.

GPT-6 Astra
✓ Preferred
Nemotron 3 Ultra (550B A55B)
Open in Playground

FAQ

Common questions about GPT-6 Astra vs Nemotron 3 Ultra (550B A55B).

Which is better, GPT-6 Astra or Nemotron 3 Ultra (550B A55B)?

GPT-6 Astra leads the LLM Stats Score 59.6 to 36.3. GPT-6 Astra is made by OpenAI and Nemotron 3 Ultra (550B A55B) is made by NVIDIA. 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 Nemotron 3 Ultra (550B A55B) 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%. Nemotron 3 Ultra (550B A55B) scores RULER: 94.7%, IMO-AnswerBench: 92.3%, PinchBench: 90.0%, LiveCodeBench v6: 89.0%, GPQA: 87.0%.

Is GPT-6 Astra cheaper than Nemotron 3 Ultra (550B A55B)?

Nemotron 3 Ultra (550B A55B) is 20.0x cheaper for input tokens. GPT-6 Astra costs $10.00/M input and $50.00/M output via openai. Nemotron 3 Ultra (550B A55B) costs $0.50/M input and $2.20/M output via deepinfra.

What are the context window sizes for GPT-6 Astra and Nemotron 3 Ultra (550B A55B)?

GPT-6 Astra supports 1.1M tokens and Nemotron 3 Ultra (550B A55B) supports 262K 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 Nemotron 3 Ultra (550B A55B)?

Key differences include LLM Stats Score (59.6 vs 36.3), context window (1.1M vs 262K), input pricing ($10.00 vs $0.50/M), multimodal support (yes vs no), licensing (Proprietary vs OpenMDW License v1.1). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-6 Astra and Nemotron 3 Ultra (550B A55B)?

GPT-6 Astra is developed by OpenAI and Nemotron 3 Ultra (550B A55B) is developed by NVIDIA.

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