API cost decision in 10 seconds

GPT-6 Astra vs Nemotron 3 Ultra (free)

Pick Nemotron 3 Ultra (free) for lower cost; pick GPT-6 Astra only if the larger context window matters more.

Pricing data updated:  Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Nemotron 3 Ultra (free) for lower cost; pick GPT-6 Astra only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Nemotron 3 Ultra (free) is estimated at $0 vs $35 for GPT-6 Astra, saving $35 (100% lower).

Cost-first pickNemotron 3 Ultra (free)
Context-first pickGPT-6 Astra
Sample savings$35100%
10x traffic gap$350

GPT-6 Astra has more context, but Nemotron 3 Ultra (free) saves $35 on the standard workload. At 10x that traffic, the same price gap is about $350. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Nemotron 3 Ultra (free) stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickGPT-6 AstraNemotron 3 Ultra (free)
Input-heavy / RAG 5M input + 500K output Nemotron 3 Ultra (free) $75 $0
Balanced workload 1M input + 1M output Nemotron 3 Ultra (free) $60 $0
Output-heavy chatbot 1M input + 5M output Nemotron 3 Ultra (free) $260 $0
Cheaper inputNemotron 3 Ultra (free)$10 vs $0 / 1M
Cheaper outputNemotron 3 Ultra (free)$50 vs $0 / 1M
Larger contextGPT-6 Astra1.05M vs 1M
Sample workloadNemotron 3 Ultra (free)$35 vs $0

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
GPT-6 AstraCalculating…Estimated API cost
Nemotron 3 Ultra (free)Calculating…Estimated API cost
Cheaper for this workloadCalculating…Difference: calculating…

This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.

Quick Decision

Verdict

Nemotron 3 Ultra (free) has the lower input price, Nemotron 3 Ultra (free) has the lower output price, and GPT-6 Astra offers the larger context window.

For a 1M input token plus 500K output token workload, the estimated API cost is $35 for GPT-6 Astra and $0 for Nemotron 3 Ultra (free).

Best Fit

Choose GPT-6 Astra when you care most about larger context window.

Choose Nemotron 3 Ultra (free) when you care most about lower input-token price, and lower output-token price.

Head-to-Head Specs
FeatureGPT-6 Astra
(OpenAI)		Nemotron 3 Ultra (free)
(NVIDIA)
Input Price
prompt tokens per 1M		$10$0
Completion Price
per 1M tokens		$50$0
Sample Workload Cost
1M input + 500K output		$35$0
Context Window1.05M1M
Release Date2026-09-042026-06-04
GPT-6 Astra

GPT-6 Astra is OpenAI's flagship model for demanding end-to-end work. It is suited for advanced analysis, software engineering, deep research, scientific work, and document creation, with particular strengths in long-horizon...

Nemotron 3 Ultra (free)

NVIDIA Nemotron 3 Ultra is an open frontier-reasoning and orchestration model from NVIDIA, with 55B active parameters out of 550B total (MoE). Built on a hybrid Transformer-Mamba mixture-of-experts architecture, it...

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionNemotron 3 Ultra (free)On the standard 1M input plus 500K output workload, Nemotron 3 Ultra (free) is estimated at $0 vs $35 for GPT-6 Astra, saving $35 (100% lower).
High-volume input processingNemotron 3 Ultra (free)Lower prompt-token price matters most when prompts or retrieved passages dominate the bill.
Long responses and chatbotsNemotron 3 Ultra (free)Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workGPT-6 AstraA larger context window leaves more room for retrieved passages and source files.