AI model comparison
Nemotron 3 Ultra vs GPT-5.1-Codex-Mini
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
NVIDIA
Nemotron 3 Ultra
NVIDIA Nemotron 3 Ultra is an open frontier-reasoning and orchestration model from NVIDIA, with 55B active parameters out of 550B total (MoE).
- Input / 1M
- $0.50
- Output / 1M
- $2.20
- Context
- 262K
OpenAI
GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex
- Input / 1M
- $0.25
- Output / 1M
- $2
- Context
- 400K
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
GPT-5.1-Codex-Mini
1.4x cheaper for a typical chat
Higher intelligence score
Nemotron 3 Ultra
22.9 vs 20.4 on Artificial Analysis
Larger context window
GPT-5.1-Codex-Mini
400K vs 262K tokens
Newer release
Nemotron 3 Ultra
Released June 4, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
GPT-5.1-Codex-Mini20.4Coding index
GPT-5.1-Codex-MiniNot availableAgentic index
GPT-5.1-Codex-MiniNot availablePricing
Nemotron 3 Ultra vs GPT-5.1-Codex-Mini API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | GPT-5.1-Codex-Mini | |
|---|---|---|
| Input tokensPer 1M tokens | $0.50 | $0.25 |
| Output tokensPer 1M tokens | $2.20 | $2 |
| Cached input (read)Per 1M tokens | $0.10 | $0.03 |
| Cache writePer 1M tokens | Not available | Not available |
| Web searchPer request | Not available | $0.01 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
GPT-5.1-Codex-Mini$1.50Coding task
30K in, 4K out
GPT-5.1-Codex-Mini$15.50$8.90 cachedLong document summary
150K in, 2K out
GPT-5.1-Codex-Mini$41.50$8.50 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | GPT-5.1-Codex-Mini | |
|---|---|---|
| Context window | 262K tokens | 400K tokens |
| Max output | 16K tokens | 128K tokens |
| Input types | Text | Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | High, Medium | High, Medium, Low |
| Default reasoning effort | High | Medium |
| Release date | June 4, 2026 | November 13, 2025 |
Features
Supported features
API features available for each model.
| Metric | GPT-5.1-Codex-Mini | |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Not supported |
| Stop sequences | Supported | Not supported |
| Deterministic seed | Supported | Supported |
| Verbosity control | Not supported | Supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
- Nemotron 3 Ultra vs DeepSeek V4 Flash 0423
- Nemotron 3 Ultra vs Gemini 3 Flash Preview
- Nemotron 3 Ultra vs Grok 4.3
- Nemotron 3 Ultra vs GPT-5.4 Mini
- Nemotron 3 Ultra vs Kimi K2.5
- Nemotron 3 Ultra vs Qwen3.5-27B
- Nemotron 3 Ultra vs MiniMax M2.5
- Nemotron 3 Ultra vs Gemini 3.5 Flash Lite
- Nemotron 3 Ultra vs GLM 4.7
- Nemotron 3 Ultra vs Kimi K2 Thinking
- Nemotron 3 Ultra vs Qwen3.6 27B
- Nemotron 3 Ultra vs GPT-5 Mini
GPT-5.1-Codex-MiniView full model details- GPT-5.1-Codex-Mini vs DeepSeek V4 Flash 0423
- GPT-5.1-Codex-Mini vs GPT-5.4 Mini
- GPT-5.1-Codex-Mini vs Gemini 3.5 Flash Lite
- GPT-5.1-Codex-Mini vs GLM 4.7
- GPT-5.1-Codex-Mini vs Qwen3.5 397B A17B
- GPT-5.1-Codex-Mini vs GPT-5.4 Nano
- GPT-5.1-Codex-Mini vs GPT-5 Mini
- GPT-5.1-Codex-Mini vs o3
- GPT-5.1-Codex-Mini vs Step 3.7 Flash
- GPT-5.1-Codex-Mini vs GLM 4.6
Our take
GPT-5.1-Codex-Mini is 1.4x cheaper for a typical chat. Nemotron 3 Ultra scores higher on the Artificial Analysis Intelligence Index (22.9 vs 20.4). GPT-5.1-Codex-Mini has the larger context window (400K vs 262K tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Nemotron 3 Ultra or GPT-5.1-Codex-Mini cheaper?
GPT-5.1-Codex-Mini is cheaper for a typical chat (2K input tokens and 500 output tokens). GPT-5.1-Codex-Mini costs $0.25 per 1M input tokens and $2 per 1M output tokens, while Nemotron 3 Ultra costs $0.50 per 1M input tokens and $2.20 per 1M output tokens.
Which has a bigger context window, Nemotron 3 Ultra or GPT-5.1-Codex-Mini?
GPT-5.1-Codex-Mini supports up to 400K tokens of context, compared with 262K for Nemotron 3 Ultra.
Is Nemotron 3 Ultra smarter than GPT-5.1-Codex-Mini?
On the Artificial Analysis Intelligence Index, Nemotron 3 Ultra scores 22.9 and GPT-5.1-Codex-Mini scores 20.4, putting Nemotron 3 Ultra ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Nemotron 3 Ultra and GPT-5.1-Codex-Mini at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Nemotron 3 Ultra and GPT-5.1-Codex-Mini answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Nemotron 3 Ultra and GPT-5.1-Codex-Mini at the same time. Compare the answers side by side and keep the best one.