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Nex AGI: Nex-N2.5-Pro (free) vs OpenAI: GPT-5.4 Nano (batch)

Neither wins outright: Nex AGI: Nex-N2.5-Pro (free) is the pick when cost matters at scale, OpenAI: GPT-5.4 Nano (batch) when you need to fit long inputs in one request.

Key numbers

SpecNex AGI: Nex-N2.5-Pro (free)OpenAI: GPT-5.4 Nano (batch)
ProviderNex AgiOpenAI
Input price (per 1M tokens)$0$0.10
Output price (per 1M tokens)$0$0.63
Blended price (3:1 input/output)$0$0.23
Cheaper than … of all models we track90%67%
Context window262K tokens (~393 pages)400K tokens (~600 pages)
Larger context than … of all models47%63%
Max output per response236K tokens (~176,900 words)128K tokens (~96,000 words)
Input typestext, imagefile, image, text
Output typestexttext
Free variantYesNo
Listed since2026-09-082026-03-17
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What it costs for real workloads

Monthly cost at list price for five common workloads. Token counts per unit are stated so you can scale them to your own traffic. A workload that does not fit a model's context window is marked rather than priced.

Workload (per month)Nex AGI: Nex-N2.5-Pro (free)OpenAI: GPT-5.4 Nano (batch)Difference
Customer-support chatbot
50,000 conversations — each a 6-turn conversation (1,500 in / 400 out tokens)
$0$20.00Nex AGI: Nex-N2.5-Pro (free) saves $20.00
RAG search over documents
20,000 questions — each a question answered from ~8 retrieved passages (6,000 in / 500 out tokens)
$0$18.25Nex AGI: Nex-N2.5-Pro (free) saves $18.25
Coding / tool-using agent
2,000 tasks — each a multi-step task with tool calls and file context (60,000 in / 6,000 out tokens)
$0$19.50Nex AGI: Nex-N2.5-Pro (free) saves $19.50
Batch summarisation
10,000 documents — each a 6,000-word report summarised to a page (8,000 in / 600 out tokens)
$0$11.75Nex AGI: Nex-N2.5-Pro (free) saves $11.75
Long-document analysis
500 documents — each a 150-page contract or codebase read in one pass (100,000 in / 2,000 out tokens)
$0$5.63Nex AGI: Nex-N2.5-Pro (free) saves $5.63

Capabilities side by side

CapabilityNex AGI: Nex-N2.5-Pro (free)OpenAI: GPT-5.4 Nano (batch)What it lets you do
Tool / function calling✓ Yes✓ Yescall your APIs and run agent loops
Structured output (JSON schema)✓ Yes✓ Yesreturn JSON that validates against your schema
Reasoning / thinking mode✓ Yes✓ Yesspend extra tokens thinking before answering hard problems
Image input✓ Yes✓ Yesread screenshots, charts and scanned pages
Audio input——take speech or audio directly
File / PDF input—✓ Yesaccept documents without your own parsing step
Image output——generate images, not just text
Built-in web search—✓ Yesanswer from live web results
Seed (reproducible sampling)—✓ Yesrepeat a generation for tests and evals
Log-probabilities✓ Yes—read token confidence for classification and scoring

From each model's published parameters and input/output types. “—” means not advertised, not proven absent.

Price history

Which should you choose?

Choose Nex AGI: Nex-N2.5-Pro (free) if…

  • cost matters at scale — it is 100% cheaper on a typical 3:1 input/output mix ($0 vs $20.00 a month for 50,000 support chats)
  • you need log-probabilities — to read token confidence for classification and scoring; OpenAI: GPT-5.4 Nano (batch) does not advertise it
  • you generate long outputs in one go — up to 236K tokens (about 176,900 words) per response
  • you want to prototype at zero cost — a free variant is listed
  • you want the newer model — released 2026-09-08, 6 months after the other

Choose OpenAI: GPT-5.4 Nano (batch) if…

  • you need to fit long inputs in one request — 400K tokens is roughly 600 pages, against 393
  • you need file / PDF input — to accept documents without your own parsing step; Nex AGI: Nex-N2.5-Pro (free) does not advertise it
  • you need built-in web search — to answer from live web results; Nex AGI: Nex-N2.5-Pro (free) does not advertise it
  • you need seed (reproducible sampling) — to repeat a generation for tests and evals; Nex AGI: Nex-N2.5-Pro (free) does not advertise it

Frequently asked questions

Is Nex AGI: Nex-N2.5-Pro (free) better than OpenAI: GPT-5.4 Nano (batch)?

Neither wins outright: Nex AGI: Nex-N2.5-Pro (free) is the pick when cost matters at scale, OpenAI: GPT-5.4 Nano (batch) when you need to fit long inputs in one request. In short: Nex AGI: Nex-N2.5-Pro (free) when cost matters at scale, you need log-probabilities, you generate long outputs in one go, you want to prototype at zero cost, you want the newer model; OpenAI: GPT-5.4 Nano (batch) when you need to fit long inputs in one request, you need file / PDF input, you need built-in web search, you need seed (reproducible sampling).

Which is cheaper, Nex AGI: Nex-N2.5-Pro (free) or OpenAI: GPT-5.4 Nano (batch)?

Nex AGI: Nex-N2.5-Pro (free) is cheaper: $0 vs $0.23 per 1M tokens at a typical 3:1 input/output mix, 100% less. For 50,000 support conversations a month that is $0 against $20.00.

How much do Nex AGI: Nex-N2.5-Pro (free) and OpenAI: GPT-5.4 Nano (batch) cost per million tokens?

Nex AGI: Nex-N2.5-Pro (free) costs $0 per 1M input tokens and $0 per 1M output tokens; OpenAI: GPT-5.4 Nano (batch) costs $0.10 input and $0.63 output. Output tokens are billed separately, so long answers shift the gap.

Which has the bigger context window, Nex AGI: Nex-N2.5-Pro (free) or OpenAI: GPT-5.4 Nano (batch)?

OpenAI: GPT-5.4 Nano (batch): 400K tokens, about 600 pages, against 262K (about 393 pages) for Nex AGI: Nex-N2.5-Pro (free).

Do Nex AGI: Nex-N2.5-Pro (free) and OpenAI: GPT-5.4 Nano (batch) support function calling and JSON output?

Tool calling — Nex AGI: Nex-N2.5-Pro (free): yes, OpenAI: GPT-5.4 Nano (batch): yes. JSON-schema structured output — Nex AGI: Nex-N2.5-Pro (free): yes, OpenAI: GPT-5.4 Nano (batch): yes.

Can Nex AGI: Nex-N2.5-Pro (free) or OpenAI: GPT-5.4 Nano (batch) read images?

Yes, both accept image input.

Is Nex AGI: Nex-N2.5-Pro (free) or OpenAI: GPT-5.4 Nano (batch) free to use?

Nex AGI: Nex-N2.5-Pro (free) has a free variant (nex-agi/nex-n2.5-pro:free). Free variants usually carry tighter rate limits.

What is the maximum output length of Nex AGI: Nex-N2.5-Pro (free) and OpenAI: GPT-5.4 Nano (batch)?

Nex AGI: Nex-N2.5-Pro (free) can write up to 236K tokens (about 176,900 words) per response; OpenAI: GPT-5.4 Nano (batch) up to 128K (about 96,000 words).

When were Nex AGI: Nex-N2.5-Pro (free) and OpenAI: GPT-5.4 Nano (batch) released?

Nex AGI: Nex-N2.5-Pro (free) was listed on 2026-09-08; OpenAI: GPT-5.4 Nano (batch) on 2026-03-17.

About the two models

Compare Nex AGI: Nex-N2.5-Pro (free) with other models

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Compare OpenAI: GPT-5.4 Nano (batch) with other models

vs AI21: Jamba Large 1.7vs AionLabs: Aion 3.5vs AionLabs: Aion 3.5 Minivs AionLabs: Aion-1.0
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